JP6271885B2 - Display control apparatus and control method thereof - Google Patents

Description

  The present invention relates to a display control device and a control method thereof.

  In recent years, displays (display devices) using LEDs (light emitting diodes) as a light source for backlights of liquid crystal panels have been increasing. For example, there is a display that can reproduce a wide range of colors by using LEDs of three primary colors of red (R), green (G), and blue (B). Such a display can faithfully reproduce colors of images in various color spaces by using appropriate display parameters.

  There are two types of color space “sRGB (standard RGB)” and “AdobeRGB” that are generally assumed in image input devices such as digital cameras and scanners, and image output devices such as liquid crystal displays and projectors. sRGB is an international standard established by the International Electrotechnical Commission (IEC), and is the most widely used color space. AdobeRGB has a wider color gamut than sRGB and is suitable for printing and retouching photographs. In the image output apparatus, it is desirable that the image is displayed with display parameters corresponding to the color space of the image (image data) recorded by the image input apparatus. Thereby, the color of the image can be reproduced faithfully.

A general display supports only sRGB. That is, it is assumed that a general display only displays an sRGB image. However, as described above, there is a display that supports a plurality of color spaces (for example, two color spaces of sRGB and AdobeRGB). In such a display, the color of the image can be faithfully reproduced by setting the color space of the image to be displayed on the display. For example, when displaying an image captured with AdobeRGB, by setting AdobeRGB on the display, the image is displayed using display parameters corresponding to AdobeRGB, and a display that faithfully reproduces the color of the image is displayed. can do.
For example, Patent Document 1 discloses a related art regarding a display corresponding to a plurality of color spaces. In the technology disclosed in Patent Document 1, based on color space information included in an image signal to be displayed, color space processing to be executed is between color space processing according to an sRGB signal and color space processing according to an xvYCC signal. Switch with.
However, when the color space set for the display changes, the color (image quality) of the entire screen changes. Since such a change gives the user a sense of incongruity, it is necessary to prevent such a change in image quality when setting a color space for the display.

  In a slide show display of a plurality of images, when switching from a high-resolution image to a low-resolution image, the image quality of the displayed image deteriorates suddenly, giving the user a sense of discomfort. In the technique disclosed in Patent Document 2, in order to reduce such a sense of incongruity, when the image quality greatly differs between the image before switching and the image after switching, the image switching is performed so that the image quality approaches each other. Sometimes noise removal processing and contrast adjustment processing are executed. However, the technique disclosed in Patent Document 2 is a technique for reducing a sense of incongruity caused by the difference in image quality before and after switching, and a technique for reducing a sense of incongruity caused by a change in the color space set for the display. Absent. Therefore, even if the technique disclosed in Patent Document 2 is used, it is not possible to reduce the uncomfortable feeling caused by the change in the color space set for the display.

JP 2009-188744 A JP 2011-180389 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a technique that can reduce or make a change in image quality due to a change in a color space set for a display device.

The first aspect of the present invention is:
A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period when the image is switched by the switching means, the opacity of the image before switching gradually decreases, and the opacity of the image after switching gradually increases ,
The setting means, the opacity of the period at a pre-switching by the switching means image in the display change period, the opacity of the image after the switching, or small change period in which both are in the following period threshold value Further, the display control device is characterized in that a color space of the image after switching is set for the display device.
The second aspect of the present invention is:
A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period in which the image is switched by the switching means, the size of the image before switching gradually decreases, and the size of the image after switching gradually increases,
The setting means is a period within the display change period, the size of the image before switching, the size of the image after switching, or a small change period in which both are periods equal to or less than a threshold value for the display device. To set the color space of the image after switching
This is a display control device characterized by that.
The third aspect of the present invention is:
A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period in which the image is switched by the switching means, the image before switching gradually moves out of the screen, and the image after switching gradually moves into the screen,
The setting means is a period within the display change period and a ratio of an area where an image before switching is displayed with respect to the area of the screen, a ratio of an area where an image after switching is displayed with respect to the area of the screen, or The color space of the image after switching is set for the display device in a small change period in which both of them are equal to or less than the threshold value.
This is a display control device characterized by that.
The fourth aspect of the present invention is:
A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period in which the image is switched by the switching means, the image before switching gradually moves out of the screen, and the image after switching gradually moves into the screen,
The setting means is a period within the display change period and the moving speed of the image before switching, the moving speed of the image after switching, or a small change period in which both are periods of a threshold value or more. Set the color space of the switched image for the display device
This is a display control device characterized by that.

According to a fifth aspect of the present invention,
A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the opacity of the image before switching gradually decreases, and the opacity of the image after switching gradually increases ,
In the setting step, the opacity of the period at a pre-switching by the switching step the image in the display change period, the opacity of the image after the switching, or small change period in which both are in the following period threshold value to a method for controlling a display control device characterized by the color space of the image after switching is set for the display device.
The sixth aspect of the present invention is:
A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the size of the image before switching gradually decreases, the size of the image after switching gradually increases,
In the setting step, before the small change period within the display change period, the image size before switching, the image size after switching, or both of which are periods below the threshold value,
The color space of the image after switching is set for the display device
This is a control method for a display control device.
The seventh aspect of the present invention is
A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the image before switching gradually moves out of the screen, the image after switching gradually moves into the screen,
In the setting step, a ratio of a region within the display change period in which an image before switching with respect to the screen region is displayed, a proportion of a region in which the image after switching with respect to the screen region is displayed, or The color space of the image after switching is set for the display device in a small change period in which both of them are equal to or less than the threshold value.
This is a control method for a display control device.
The eighth aspect of the present invention is
A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the image before switching gradually moves out of the screen, the image after switching gradually moves into the screen,
In the setting step, a period within the display change period and the moving speed of the image before the switching, the moving speed of the image after the switching, or a small change period in which both are periods of a threshold value or more, The color space of the image after switching is set for the display device
This is a control method for a display control device.

  ADVANTAGE OF THE INVENTION According to this invention, the change of the image quality by the color space set with respect to the display apparatus changing can be reduced or made inconspicuous.

1 is a block diagram illustrating an example of a configuration of a display device according to a first embodiment. 7 is a flowchart illustrating an example of a processing flow of the display device according to the first embodiment. The figure which shows an example of the display effect which concerns on Example 1. FIG. The figure which shows an example of the setting window which concerns on Example 1. FIG. FIG. 10 is a diagram illustrating an example of timing for changing the set color space according to the first embodiment. The figure which shows an example of the threshold value table which concerns on Example 1. FIG. The figure which shows an example of the timing which changes the setting color space which concerns on Example 2. FIG. 10 is a flowchart illustrating an example of a processing flow of the display device according to the second embodiment. The figure which shows an example of the timing which changes the setting color space which concerns on Example 2. FIG. The figure which shows an example of the timing which changes the setting color space which concerns on Example 3. FIG. The figure which shows an example of the timing which changes the setting color space which concerns on Example 4. FIG. 10 is a flowchart illustrating an example of a processing flow of a display device according to the fifth embodiment. The figure which shows an example of the timing which changes the setting color space which concerns on Example 5. FIG.

Hereinafter, a display control apparatus and a control method thereof according to embodiments of the present invention will be described with reference to the drawings. However, the following examples are merely examples, and the present invention is not limited to the following examples.
A display control device according to the following embodiment is a device that controls a display device. The display device displays an image with display parameters corresponding to the set color space (set color space).
Below, the example in case a display control apparatus is a part of display apparatus is demonstrated.

<Example 1>
Hereinafter, a display control apparatus and a control method thereof according to Embodiment 1 of the present invention will be described with reference to the drawings.
The display device 100 according to the first embodiment of the present invention has a viewer function. The viewer function is a function that slides a plurality of images. In this embodiment, when the image to be displayed is switched, the display on the display device 100 is gradually changed from the image before switching to the image after switching due to the display effect set by the user. A period in which the display of the display device 100 is changed is referred to as a “display change period”. The display effect may be determined in advance by the manufacturer. In this embodiment, an example in which the display effect is “fade” will be described. Specifically, the opacity of the image before switching gradually decreases, and the size of the image before switching gradually decreases. Then, after the image before switching is no longer displayed, the opacity of the image after switching gradually increases and the size of the image after switching gradually increases.

  FIG. 1 is a block diagram illustrating an example of the configuration of the display device 100 according to the present embodiment.

The user operation unit 101 is a user interface such as buttons, a keyboard, and a mouse that are used by the user to operate the display device 100. In the present embodiment, the user operation unit 101 is a button disposed on the front surface of the housing of the display device 100. The user operates the user operation unit 1
By operating 01, switching of images to be displayed, starting a slide show, setting display effects, and the like are performed. FIG. 4 shows an example of a setting window for setting details of display effects. When the user operates the setting window shown in FIG. 4, the display effect parameters include “display effect type”, “display change period length”, “fade-out time”, “fade-in time”, and “expansion during fade”. “Presence / absence of reduction” is set. The fade-out time is the time required to hide the image before switching. The fade-in time is the time required to completely display the image after switching.

  The display panel 102 is a display module such as a liquid crystal display, an organic EL display, or a plasma display that displays an image. In this embodiment, the display panel 102 is a liquid crystal display having a liquid crystal panel and a backlight. One pixel of the liquid crystal panel includes, for example, an R subpixel having a red (R) color filter and a liquid crystal element, a G subpixel having a green (G) color filter and a liquid crystal element, and a blue (B) color filter. And three sub-pixels of B sub-pixels having liquid crystal elements. The transmittance of the three sub-pixels (liquid crystal elements included in the three sub-pixels) is controlled according to image data. White light emitted from the backlight passes through the three sub-pixels. By the additive color mixture of light transmitted through the three sub-pixels, it is possible to display a color corresponding to the image data. As the light source of the backlight, CCFL (cold cathode tube), LED (light emitting diode), or the like can be used.

  The display control unit 103 controls the display panel 102 to display an image on the display panel 102. In this embodiment, the display control unit 103 controls the transmittance of each sub-pixel of the liquid crystal panel by controlling a signal output to the liquid crystal panel. Specifically, the display control unit 103 performs correction processing using the display parameter corresponding to the set color space on the image (image data) decoded by the decoder 106. The display control unit 103 outputs the corrected image to the display panel 102 (liquid crystal panel). The signal output to the liquid crystal panel is, for example, a 10-bit (0 to 1023) signal.

表１は、色空間設定部１０４が用いるパラメータ管理テーブルの一例を示している。表１において、「バックライト設定値」は、バックライトの発光輝度や色温度など、バックライトの制御に用いるパラメータである。Ｒ（赤），Ｇ（緑），Ｂ（青）のバックライトを用いる場合は、Ｒ値、Ｇ値、Ｂ値のパラメータが用いられる。「信号処理設定値」は、色空間補正値やガンマ補正値など、画像信号の補正に用いるパラメータである。「バックライト設定値」および「信号処理設定値」は、製品出荷前に予め格納しておいてもよいし、製品出荷後のキャリブレーション実行時に記憶するようにしてもよい。
色空間設定部１０４は、パラメータ管理テーブルを用いて、表示対象の画像の色空間に対応する表示パラメータを判断し設定する。 The color space setting unit 104 sets a color space of an image to be displayed on the display device 100. In this embodiment, the color space setting unit 104 sets a color space for the display device 100 in response to a request from the display effect processing unit 115. The color space setting unit 104 stores therein display parameters corresponding to sRGB and display parameters corresponding to AdobeRGB. Then, the color space setting unit 104 performs processing for outputting display parameters corresponding to the color space of the image to be displayed to the display control unit 103 as processing for setting the color space for the display device 100. For example, when sRGB is set for the display device 100, display parameters corresponding to sRGB are output to the display control unit 103. Accordingly, the display control unit 103 performs correction processing using display parameters corresponding to sRGB, and can faithfully reproduce the color of the sRGB image. Similarly, when an AdobeRGB color space is set for the display device 100, display parameters corresponding to AdobeRGB are output to the display control unit 103.
The color space is not limited to sRGB and AdobeRGB. Display parameters corresponding to color spaces other than sRGB and AdobeRGB may be prepared in advance.

Table 1 shows an example of a parameter management table used by the color space setting unit 104. In Table 1, “Backlight setting value” is a parameter used for backlight control, such as light emission luminance and color temperature of the backlight. When using backlights of R (red), G (green), and B (blue), R value, G value, and B value parameters are used. The “signal processing set value” is a parameter used for correcting an image signal such as a color space correction value or a gamma correction value. The “backlight setting value” and the “signal processing setting value” may be stored in advance before product shipment, or may be stored when calibration is performed after product shipment.
The color space setting unit 104 determines and sets display parameters corresponding to the color space of the display target image using the parameter management table.

  The image storage unit 105 stores an image (image data) such as JPEG taken by a digital camera or the like. As the image storage unit 105, a magnetic disk such as an HDD (hard disk drive), an optical disk such as a CD, a DVD, or a Blu-ray disk, a semiconductor memory such as a flash memory, or the like can be used. When a slide show of a plurality of images is performed, the images stored in the image storage unit 105 are sequentially read and displayed.

  The decoder 106 reads an image (image data) to be displayed from the image storage unit 105 and decodes the read image. Specifically, the decoder 106 decodes an encoded image such as JPEG. JPEG is an image file format recorded in a Y (luminance) CbCr (color difference) format. The decoder 106 converts the YCbCr format image into an RGB format image and develops the converted image in the first frame buffer 107 or the second frame buffer 108. When a slide show of a plurality of images is performed, the plurality of images are sequentially decoded, and the decoded images are alternately developed in the first frame buffer 107 and the second frame buffer 108.

  The first frame buffer 107 and the second frame buffer 108 are storage devices that temporarily store the decoded image. As the first frame buffer 107 and the second frame buffer 108, a RAM (Random Access Memory) can be used.

  The image switching control unit 109 switches an image to be displayed on the display device. For example, when a slide show of a plurality of images is performed, the image switching control unit 109 sequentially switches the images to be displayed on the display device. Further, when a user operation for changing an image to be displayed is performed, the image switching control unit 109 switches an image to be displayed on the display device in accordance with the user operation. Specifically, the image switching control unit 109 reads an image to be displayed (image after switching) from the first frame buffer 107 or the second frame buffer 108 and outputs the image to the display effect processing unit 115. When a slide show of a plurality of images is performed, the images are alternately read from the first frame buffer 107 and the second frame buffer 108. Further, the image switching control unit 109 manages the current set color space, and sets the color space information indicating the current set color space in response to a request from the color space switching determination unit 111. Output to.

  The image color space acquisition unit 110 acquires color space information representing the color space of the image to be displayed. In this embodiment, the image color space acquisition unit 110 reads an image (image data) to be displayed from the image storage unit 105. Then, the image color space acquisition unit 110 extracts the header information of the read image, and extracts the color space information from the header information. Specifically, metadata called EXIF (Exchangeable image file format) is described in the header information, and color space information is extracted from the metadata. Further, the image color space acquisition unit 110 outputs the color space information to the color space switching determination unit 111 in response to a request from the color space switching determination unit 111.

The color space switching determination unit 111 determines whether or not the setting color space needs to be changed based on the setting color space information acquired from the image switching control unit 109 and the color space information acquired from the image color space acquisition unit 110. To do. The set color space information acquired from the image switching control unit 109 is the current set color space set for the display device 100, and the color space information acquired from the image color space acquisition unit 110 is the image color to be displayed. Color space. Specifically, the color space switching determination unit 111 determines whether or not the set color space represented by the set color space information matches the color space represented by the color space information. When the set color space represented by the set color space information matches the color space represented by the color space information, the color space switching determination unit 111 determines that the change of the set color space is unnecessary. When the set color space represented by the set color space information is different from the color space represented by the color space information, the color space switching determination unit 111 determines that the set color space needs to be changed. Then, the color space switching determination unit 111 notifies the color space switching timing calculation unit 114 that the set color space needs to be changed.

  The display effect parameter setting unit 112 sets details of the display effect (display effect parameter). Specifically, the display effect parameter setting unit 112 displays the setting window shown in FIG. 4 on the display panel 102, receives the value of the display effect parameter input by the user, and outputs it to the display effect processing unit 115.

  The threshold value storage unit 113 stores in advance a threshold value for calculating a small change period in which the change in image quality due to a change in the set color space within the display change period is the smallest or inconspicuous.

The color space switching timing calculation unit 114 calculates the timing for starting the setting of the color space of the image after switching for the display device 100 when the image to be displayed is switched. Specifically, the timing is calculated so that the color space of the image after switching is set for the display device 100 during the small change period within the display change period. The timing (specifically, the small change period) includes the display effect feature amount calculated using the display effect parameter acquired from the display effect parameter setting unit 112, and the threshold value stored in the threshold value storage unit 113. Is calculated using
In the present embodiment, the timing is calculated only when the color space of the image before switching is different from the color space of the image after switching, and the color space of the image after switching is set for the display device 100. However, this is not a limitation. The above processing may be performed regardless of whether the color space of the image before switching is different from the color space of the image after switching.

When the image to be displayed is switched, the display effect processing unit 115 switches the display of the display device 100 from the image before switching with a display effect according to the display effect parameter set by the display effect parameter setting unit 112. Change the image gradually. When the “display effect type” is fade, the display effect processing unit 115 gradually reduces the opacity of the image before switching output from the image switching control unit 109 from 100% to 0% over the fade-out time. . Thereafter, the display effect processing unit 115 gradually increases the opacity of the image after switching output from the image switching control unit 109 from 0% to 100% over the fade-in time. The opacity is a value obtained by subtracting from 100% the rate at which the image is transmitted through the background. That is, when the opacity is 100%, the background does not transmit the image at all, and the image is displayed completely. When the opacity is 0%, the background completely transmits the image and the image is not displayed. At this time, if one of the display effect parameters “existence of enlargement / reduction at the time of fading” is “present”, the display effect processing unit 115 performs the following processing. That is, the display effect processing unit 115 changes the size of the image before switching output from the image switching control unit 109 (ratio of the size of the displayed image to the original image size) from 100% to 40 over the fade-out time. Decrease gradually to%. Thereafter, the display effect processing unit 115 gradually increases the size of the image after switching output from the image switching control unit 109 from 40% to 100% over the fade-in time. Note that the final image size of the image to be faded out and the initial image size of the image to be faded in are not limited to 40%. It may be larger or smaller than 40%. The final image size of the image to be faded out may be different from the initial image size of the image to be faded in.
Further, when the image to be displayed is switched, the display effect processing unit 115 sets the color space setting of the image after switching to the display device 100 at the timing calculated by the color space switching timing calculation unit 114. Request to the setting unit 104. Specifically, when the display effect processing unit 115 is notified from the color space switching determination unit 111 that the setting color space needs to be changed, the display effect processing unit 115 sets the timing at the timing calculated by the color space switching timing calculation unit 114. The color space setting unit 104 is requested to change the color space.

  FIG. 2 is a flowchart illustrating an example of a processing flow of the display device 100. Hereinafter, an example in which the display is switched from the image A to the image B during the slide show will be described.

  First, when the image to be displayed is switched from the image A to the image B by the image switching control unit 109, in S201, the color space switching timing calculation unit 114 sets the display effect parameter setting values shown in FIG. Obtained from the unit 112. In the example of FIG. 4, “display effect type” is “fade”, “display change period length” is “2000 msec”, “fade-out time” is “1000 msec”, “fade-in time” is “1000 msec”, “ “Presence / absence of enlargement / reduction at the time of fading” is “present”. When such display effect parameters are set, when the display is switched from the image A to the image B, as shown in FIGS. 3 and 5, the image A is not displayed over 1000 msec. The opacity gradually decreases and the size of the image A gradually decreases. Then, the opacity of the image B is gradually increased and the size of the image B is gradually increased so that the image B is completely displayed over 1000 msec after the image A is not displayed. Such control of opacity and size is performed by the display effect processing unit 115. Hereinafter, the display effect of gradually changing the opacity of the image and the size of the image in this manner is referred to as “enlargement / reduction fade”.

  Next, in S202, the color space switching timing calculation unit 114 receives the determination result from the color space switching determination unit 111 (determination result as to whether or not the setting color space needs to be changed). At this time, the color space switching determination unit 111 acquires set color space information from the image switching control unit 109.

  In step S <b> 203, the color space switching determination unit 111 requests the image color space acquisition unit 110 to acquire color space information of the image B. In response to a request from the color space switching determination unit 111, the image color space acquisition unit 110 extracts EXIF, which is metadata of the image B, and extracts color space information of the image B described in EXIF. Then, the image color space acquisition unit 110 outputs the extracted color space information of the image B to the color space switching determination unit 111.

  Next, in S204, the color space switching determination unit 111 determines whether or not the setting color space needs to be changed based on the set color space information acquired in S202 and the color space information acquired in S203. Then, the determination result is notified to the color space switching timing calculation unit 114. When the current set color space represented by the set color space information acquired in S202 and the color space represented by the color space information acquired in S203 are different from each other, the color space switching determination unit 111 sets the set color. It is determined that the space needs to be changed. The current set color space represented by the set color space information acquired in S202 is the color space of the image before switching, and the color space represented by the color space information acquired in S203 is the color of the image after switching. It is space. Then, the process proceeds to S207. When the current set color space represented by the set color space information acquired in S202 and the color space represented by the color space information acquired in S203 are the same, the color space switching determination unit 111 sets the setting color space. It is determined that there is no need to change the color space. Then, the process proceeds to S205.

Here, an example in which the color space of the image A and the color space of the image B are the same will be described.
First, in S205, the image switching control unit 109 instructs the decoder 106 to decode the image B. The decoder 106 reads the image B (JPEG file) from the image storage unit 105, decodes the read image B, and develops it in the frame buffer. Here, it is assumed that the image A is developed in the first frame buffer 107. If the image B is developed in the first frame buffer 107, the image A is deleted from the first frame buffer 107, and the display effect cannot be realized. For this reason, the decoded image B is developed in the second frame buffer 108. Then, the image switching control unit 109 reads the image A from the first frame buffer 107 and outputs it to the display effect processing unit 115. The display effect processing unit 115 changes the opacity of the image A from 100% to 0% over 1000 msec and reduces the size (display size) of the image A from 100% to 40%. As a result, the image A gradually fades out as indicated by reference numerals 301 and 302 in FIG.
When the fade-out of the image A is completed, the image switching control unit 109 reads the image B from the second frame buffer 108 and outputs it to the display effect processing unit 115 in S206. The display effect processing unit 115 increases the opacity of the image B from 0% to 100% and increases the size of the image B from 40% to 100% over 1000 msec. As a result, the image 4 gradually fades in as indicated by reference numerals 303 and 304 in FIG.
Therefore, the display is switched from the image A to the image B over 2000 msec by the processes of S205 and S206.

Next, an example in which the color space of the image A and the color space of the image B are different from each other (when the color space of the image A is AdobeRGB and the color space of the image B is sRGB) is shown in FIGS. It explains using.
First, in S207, the color space switching timing calculation unit 114 acquires a threshold value table as illustrated in FIG. The threshold value table is a table representing the correspondence relationship between the type of display effect, the characteristic amount of the display effect focused on to calculate the small change period, and the threshold value for calculating the small change period. In the example of FIG. 6, the characteristic amount of the display effect includes “opacity”, “luminance”, “saturation”, “size”, “speed”, and “display ratio”. “Opacity” is a value obtained by subtracting from 100% the ratio of the background transmitting through the image. “Size” is the ratio of the size of the displayed image to the size (resolution) of the original image. “Luminance” is the average luminance of an image. “Saturation” is the ratio of the saturation of the image to the maximum saturation of the display device 100. “Speed” is the moving speed of the image. “Display ratio” is the ratio of the area where the image is displayed to the area of the screen.

Next, in S208, the color space switching timing calculation unit 114 uses the display effect parameter setting value acquired in S201 and the threshold value table acquired in S207 to start the change of the set color space. calculate. Specifically, the timing for starting the setting of the color space of the image B for the display device 100 is calculated. As shown in FIG. 5, the display effect is the same as that shown in FIG.
First, it is determined from the set value of the display effect parameter that the type of display effect is “enlargement / reduction fade”.
Next, it is determined from the threshold value table that the feature amounts of the display effect corresponding to “enlargement / reduction fade” are “opacity” and “size”. In this embodiment, attention is paid to opacity in order to calculate the small change period.
Then, it is determined from the threshold table that the opacity threshold is “40%”.
Next, the small change period is calculated from the length of the display change period, the fade-out time, the fade-in time, and the opacity threshold. In the present embodiment, a period in which the change in both the image quality of the image A and the image quality of the image B (change due to the change in the set color space) is the smallest or inconspicuous is calculated as the small change period. The lower the opacity, the smaller the change in image quality due to the change in the set color space. Therefore, a period in which the opacity of both the image A and the image B is equal to or less than a threshold value (40% or less) is calculated as a small change period. In the example of FIG. 5, the opacity of the image A gradually decreases from time T510, becomes opacity 40% at time T520 600 msec from time T510, and becomes 0% at time T550. For image B, the opacity gradually increases from time T550, the opacity is 40% at time T530, and the opacity is 100% at time T540. Therefore, the period from time T520 to time T530 is a small change period. The length of the small change period is 800 msec.
Then, the timing for starting the change of the set color space is set so that the color space of the image B is set for the display device 100 in the period in which the change in the image quality of the image B within the small change period is the smallest or inconspicuous. Calculated. It is preferable to prioritize the image quality of the image after switching over the image quality of the image before switching. By setting the color space of the image B for the display device 100 in a period in which the change in the image quality of the image B within the small change period is the smallest or inconspicuous, the change in the image quality of the image B can be further reduced. . In this embodiment, time T520 is calculated as the timing for starting the change of the set color space.
Information indicating the calculated timing is notified to the display effect processing unit 115.
When there are a plurality of display effect feature amounts corresponding to the “enlargement / reduction fade”, the small change period may be calculated for each feature amount. A period in which any one of the plurality of feature quantities satisfies the determination condition for the small change period may be calculated as the small change period.

  In S209, the image A is faded out as in S205, and in S210, the image B is faded in as in S206.

  Further, the process of S211 is performed in parallel with the processes of S209 and S210. In S211, the display effect processing unit 115 requests the color space setting unit 104 to change the set color space at the timing (time T520) calculated in S208. The color space setting unit 104 changes the set color space in response to a request from the display effect processing unit 115. Specifically, the set color space is changed from AdobeRGB to sRGB (the color space of the image B is set for the display device 100). In the example of FIG. 5, the time required for changing the set color space (the time required for setting the color space for the display device 100; the set color space change time) is 400 msec. Therefore, the change of the set color space is completed within the small change period.

  As described above, according to the present embodiment, when the image to be displayed is switched, the color space of the image after switching is set for the display device in the small change period within the display change period. Thereby, a change in image quality due to a change in the set color space can be reduced or made inconspicuous.

  In the present embodiment, the color space of the image after switching is set for the display device during the small change period. However, the present invention is not limited to this configuration. The setting of the color space of the image after switching with respect to the display device may be performed in a period outside the small change period as long as it is performed in the display change period. In the display change period, the change in image quality due to the change in the set color space is smaller or less noticeable than in the display change period. By setting the color space of the image after switching for the display device during the display change period, the set color space is set compared with the case where the color space of the image after switching is set for the display device outside the display change period. Changes in image quality due to changes can be reduced or made inconspicuous.

  In this embodiment, an example in which the display control device is a part of the display device has been described. However, the display control device may be a device (such as a personal computer) separate from the display device. For example, a display control device separate from the display device may sequentially decode the images to be displayed in the slide show and output them to the display device. Further, a display control device separate from the display device may set a color space for the display device. These processes are realized, for example, when the display control apparatus executes a program such as a viewer application.

  In this embodiment, the period in which the change in both the image quality of the image before switching and the image quality of the image after switching is the smallest or inconspicuous is set as the small change period, but the small change period is not limited to this. For example, the small change period may be a period in which the change in image quality of the image before switching is the smallest or inconspicuous, or a period in which one change in the image quality of the image after replacement is the smallest or inconspicuous. Specifically, the small change period may be a period in which the opacity of the image before switching is less than or equal to a threshold, a period in which the opacity of the image after switching is less than or equal to the threshold, and the like. If the period in which the image quality change before switching is the smallest or inconspicuous is set as the small change period, the change in image quality before switching due to the change in the set color space can be reduced or made inconspicuous. If the period in which the image quality change after switching is the smallest or inconspicuous is set as the small change period, the change in image quality after switching due to the change in the set color space can be reduced or made inconspicuous. If the period in which the change in both the image quality before switching and the image quality after switching is the smallest or inconspicuous is defined as the small change period, the image quality after switching is changed to the image quality before switching due to the change of the set color space. Both changes in image quality can be reduced or made inconspicuous.

  In this embodiment, attention is paid to “opacity”. However, when the size of the image before switching gradually decreases during the display change period and the size of the image after switching gradually increases, the “size” You may pay attention to. The smaller the size, the smaller the change in image quality due to the change in the set color space. Therefore, the small change period may be a period in which the size of the image before switching, the size of the image after switching, or both are equal to or less than the threshold value.

  In the present embodiment, the example in which the timing for starting the display change from the pre-switching image to the post-switching image is coincident with the timing for starting the change of the set color space is shown. It does not have to match. As long as the set color space can be changed within the small change period, the timing for starting the change of the set color space may be any timing.

In this embodiment, “opacity”, “brightness”, “saturation”, “size”, “speed”, and “display ratio” are listed as feature amounts of the display effect. However, the feature amount is not limited to this. Absent. Any feature amount may be used as long as it affects the appearance of the change in image quality due to the change in the set color space. The specific value of the threshold is not limited to the value shown in FIG. The threshold and its determination method are arbitrarily determined by the manufacturer or user. Specifically, the opacity threshold may be set to 100% when the length of the display change period is shorter than 2000 msec and the set color space change time is longer than 50 msec. Then, the set color space may be changed immediately after the start of fade-out of the image before switching.
The color space conversion process of the display device 100 may be started.
The set color space change time varies depending on the color space of the image after switching. For example, when the backlight lighting method needs to be changed in order to expand the color gamut, the set color space change time is long. Therefore, the set color space change time may be calculated based on the color space of the image after switching, and the set color space change time may be compared with the length of the small change period. If the set color space change time is longer than the length of the small change period, the timing for starting the change of the set color space is prior to the small change period so that the image quality of the image after switching is prioritized. It may be set. For example, in FIG. 5, when the set color space change time is 900 msec, the timing for starting the change of the set color space may be advanced by 100 msec. Then, the change of the set color space may be started at a timing 500 msec after the fade-out start time of the image A.

<Example 2>
Hereinafter, a display control apparatus and a control method thereof according to Embodiment 2 of the present invention will be described with reference to the drawings.
In this embodiment, a case where the display effect is dissolve (superimposition of images) as shown in FIG. 7 will be described. Even when the display effect is dissolve, as in the first embodiment, the timing for starting the change of the set color space is determined by paying attention to the “opacity”.
Furthermore, in this embodiment, when the set color space change time that depends on the performance of the display device and the color space of the image after switching is longer than the length of the small change period, the change in image quality due to the change in the set color space is detected. A configuration that can be further reduced or made inconspicuous will be described.
The configuration of the display device according to the present embodiment is the same as that of FIG.

  FIG. 8 is a flowchart illustrating an example of a processing flow of the display device 100 according to the present embodiment. Below, the example in the case of switching a display from the image A to the image B by user operation is demonstrated.

The processes in S801 to S806 are the same as those in the first embodiment (the processes in S201 to S206 in FIG. 2).
However, in this embodiment, “display effect type” is “dissolve”, “display change period length” is “2500 msec”, “fade-out time” is “1900 msec”, and “fade-in time” is “1900 msec”. It shall be.

  If it is determined in S804 that the setting color space needs to be changed, in S807, the color space switching timing calculation unit 114 acquires a threshold table as shown in FIG.

  Next, in S808, the color space switching timing calculation unit 114 determines the set color space change time. The set color space switching time may be stored in advance in the color space switching timing calculation unit 114, or may be calculated based on the color space of the image B or the like.

In step S809, the color space switching timing calculation unit 114 calculates a small change period. Here, the type of display effect is “dissolve”, and the feature amount of the display effect corresponding to “dissolve” is “opacity”. Therefore, the period in which the opacity of both the image A and the image B is 40% or less is calculated as the small change period by the same method as in the first embodiment (the process of S208 in FIG. 2). In the example of FIG. 7, the opacity of the image A gradually decreases from time T710, the opacity becomes 40% at time T730 after 1140 msec from time T710, and the opacity becomes 0% at time T760. For image B, the opacity gradually increases from time T720 600 msec after time T710, the opacity is 40% at time T750, and the opacity is 100% at time T770. Therefore, the period from time T730 to time T750 is a small change period. The length of the small change period is 220 msec.
In this step, the color space switching timing calculation unit 114 determines whether or not the set color space change time is longer than the length of the small change period. If the set color space change time is longer than the length of the small change period, the color space switching timing calculation unit 114 determines that the display effect parameter needs to be adjusted, and the process proceeds to S810. If the set color space change time is less than or equal to the length of the small change period, the color space switching timing calculation unit 114 determines that adjustment of the display effect parameter is unnecessary, and the process proceeds to S811.

Here, an example will be described in which the set color space change time is equal to or shorter than the length of the small change period (specifically, the set color space change time is 200 msec).
First, in S811, the color space switching timing calculation unit 114 calculates the timing for starting the change of the set color space in the same manner as in the first embodiment (the process of S208 in FIG. 2). Specifically, as shown in FIG. 7, time T730 is calculated as the timing for starting the change of the set color space.
Next, in S812, the image A is faded out in the same manner as in the first embodiment (the processing in S209 in FIG. 2), and in S813, the image B is faded in in the same manner as in the first embodiment (the processing in S210 in FIG. 2). .
In addition, the process of S814 is performed in parallel with the processes of S812 and S813. In S814, the display effect processing unit 115 changes the set color space to the color space setting unit 104 at the timing calculated in S811 (timing at time T730), as in the first embodiment (the processing in S211 in FIG. 2). Request. The color space setting unit 104 changes the set color space in response to a request from the display effect processing unit 115. Specifically, the set color space is changed from AdobeRGB to sRGB (the color space of the image B is set for the display device 100). As shown in FIG. 7, the set color space is changed while the image A and the image B are displayed overlapping each other.

Next, an example when the set color space change time is longer than the length of the small change period (specifically, when the set color space change time is 460 msec) will be described.
First, in S810, the color space switching timing calculation unit 114 controls the display effect method (how to change the display on the display device) so that the length of the small change period is equal to or longer than the set color space change time. In this embodiment, the fade-out end time (fade-out end time) of the image A is adjusted by adjusting the fade-out time. As described above, the fade-out end time of the current image A is time T760. Specifically, the fade-out time is shortened from 1900 msec to 1500 msec in order to increase the length of the period in which the opacity of image A and the opacity of image B are both 40% or less. As a result, as shown in FIG. 9, the fade-out end time of image A is changed from time T760 to time T950. And the process of S811-S814 mentioned above is performed. However, here, the adjusted display effect parameter is used. In this example, the fade-out time was shortened from 1900 msec to 1500 msec by the process of S810. Therefore, the opacity of the image A is 40% or less at a time T930 240 msec before the time T730 (a time T930 900 msec after the fade-out start time T710 of the image A). As a result, the period from time T930 to time T750 becomes a small change period, and the length of the small change period is extended from 220 msec to 460 msec. Then, time T930 is calculated as the timing for starting the change of the set color space, and the change of the set color space can be completed within the small change period.

As described above, according to the present embodiment, even when the display effect is dissolve, as in the first embodiment, the change in image quality due to the change in the set color space can be reduced or made inconspicuous. it can.
In addition, according to the present embodiment, when the set color space change time is longer than the length of the small change period, the display device display is changed so that the length of the small change period becomes equal to or longer than the set color space change time. The way is controlled. Thereby, the change of the set color space can be completed within the small change period, and the change in the image quality due to the change of the set color space can be further reduced or made inconspicuous.

  In this embodiment, the fade-out time of the image A before switching is adjusted, but the fade-in time of the image B after switching may be adjusted. Both the fade-out time of image A before switching and the fade-in time of image B after switching may be adjusted. The length of the display change period may be adjusted. Any parameter may be adjusted as long as the length of the small change period is equal to or longer than the set color space change time.

  In the present embodiment, the configuration in which the length of the small change period is adjusted so that the length of the small change period matches the set color space change time has been described. However, the length of the small change period after adjustment has been described. May be longer than the set color space change time.

In the present embodiment, the color space switching timing calculation unit 114 controls the display effect method (how to change the display of the display device). However, functional units other than the color space switching timing calculation unit 114 have their configuration. Such control may be performed. The display control apparatus may further include a control unit that performs such control in addition to the functional unit illustrated in FIG. 1.

  If the set color space change time is longer than the length of the small change period, the timing for starting the change of the set color space with priority given to the image quality of the image B is advanced without adjusting the display effect parameter. Also good. That is, the set color space may be changed during a period in which the opacity of the image B is 40% or less within the display change period.

<Example 3>
Hereinafter, a display control apparatus and a control method thereof according to Embodiment 2 of the present invention will be described with reference to the drawings.
In this embodiment, a case where the display effect is slide-in / out as indicated by reference numerals 1001 to 1004 in FIG. 10 will be described. In slide-in / out, the image before switching is moved out of the screen, and the image after switching is moved into the screen, so that the display is gradually changed from the image before switching to the image after switching. The higher the moving speed of the image, the less noticeable the change in image quality due to the change in the set color space. Therefore, in this embodiment, a period in which both the moving speed of the image before switching and the moving speed of the image after switching are equal to or greater than the threshold value is calculated as the small change period. Thereby, the same effects as those of the first and second embodiments can be obtained.
The configuration of the display device according to the present embodiment is the same as that of FIG.

A processing flow of the display device according to the present embodiment will be described with reference to FIG. In the present embodiment, processes other than S208 are the same as those in the first embodiment.
In S208, the color space switching timing calculation unit 114 calculates the timing to start changing the set color space using the display effect parameter setting value acquired in S201 and the threshold value table acquired in S207.

First, it is determined from the set value of the display effect parameter that the “display effect type” is “slide in / out”.
Next, it is determined from the threshold value table that the feature amount of the display effect corresponding to “slide in / out” is “speed”. Here, as the value of the moving speed of the image, a value expressed in meters, which is a value independent of the resolution of the display device, is used. If the resolution ppi of the display panel 102 is used, a value in units such as “pixel / sec” can be obtained from the value in meters as the value of the moving speed.
Then, it is determined from the threshold table that the speed threshold is “0.1 m / sec”.

  Next, a small change period is calculated. In the present embodiment, a period in which both the moving speed of the image A and the moving speed of the image B are equal to or greater than the threshold is calculated as the small change period. Specifically, in this embodiment, it is assumed that the display is gradually changed from the image A to the image B by the display effect (slide in / out) as shown in FIG. In the example of FIG. 10, the image A moves (slides out) from the screen while accelerating from time T1010. At time T1020, 600 msec after time T1010, the moving speed of image A is 0.1 m / sec. Then, the image A is not completely displayed at time T1030 after 750 msec from time T1010. In the example of FIG. 10, the image B moves (slides in) from the time T1030 while decelerating. At time T1040, the moving speed of the image B becomes 0.1 m / sec. Then, the image B is completely displayed at time T1050. Therefore, the period from time T1020 to time T1040 is calculated as a small change period. The length of the small change period is 300 msec.

Then, time T1020 is calculated as the timing for starting the change of the set color space. As a result, the change of the color space is started at the timing of time T1020. As shown in FIG. 10, since the set color space change time is 200 msec, the change of the set color space is completed before the end time T1040 of the small change period.

  As described above, according to the present embodiment, even when the display effect is slide-in / out, the change in the image quality due to the change in the set color space is reduced by paying attention to the moving speed of the image. Or it can be inconspicuous.

  In the present embodiment, the period in which both the moving speed of the image before switching and the moving speed of the image after switching are equal to or greater than the threshold is defined as the small change period, but the small change period is not limited to this. For example, the small change period may be a period in which the moving speed of the image before switching is greater than or equal to a threshold, a period in which the moving speed of the image after switching is greater than or equal to the threshold, and the like.

  In this embodiment, attention is paid to “speed”. However, when the display effect is slide-in / out, the display ratio of the image before switching gradually decreases during the display change period, and the image after switching is displayed. The display ratio gradually increases. For this reason, when the display effect is slide-in / out, attention may be paid to the “display ratio”. The smaller the display ratio, the smaller the change in image quality due to the change in the set color space. Therefore, a small change period may be a period in which the display ratio of the image before switching, the display ratio of the image after switching, or both are equal to or less than the threshold value.

  When the set color space change time is longer than the length of the small change period, the display effect parameter may be adjusted as in the second embodiment. For example, the moving speed (slide-out speed) of the image before switching, the moving speed (slide-in speed) of the image after switching, and the like may be adjusted so that the length of the small change period becomes longer.

  In the present embodiment, an example is shown in which the image after switching is moved into the screen after the image before switching is not completely displayed. However, the image before switching is moved out of the screen. The image after switching to the inside may move within the screen. That is, the period during which the image before switching slides out and the period during which the image after switching slides in may overlap.

<Example 4>
Hereinafter, a display control apparatus and a control method thereof according to Embodiment 4 of the present invention will be described with reference to the drawings. As indicated by reference numerals 1101 to 1104 in FIG. 11, the display effect of the present embodiment is the same (scaling fade) as the display effect of the first embodiment. However, in the first embodiment, the threshold value is a value prepared in advance, whereas in this embodiment, the threshold value is calculated from the size of the image.
The configuration of the display device according to the present embodiment is the same as that of FIG.

A processing flow of the display device according to the present embodiment will be described with reference to FIG. In the present embodiment, processes other than S208 are the same as those in the first embodiment.
In S208, the color space switching timing calculation unit 114 calculates the timing to start changing the set color space using the display effect parameter setting value acquired in S201 and the threshold value table acquired in S207.

First, it is determined from the display parameter setting value that the “display effect type” is “enlargement / reduction fade”.
Next, it is determined from the threshold value table that the feature amounts of the display effect corresponding to “enlargement / reduction fade” are “opacity” and “size”.

Based on both the size of the image before switching and the size of the image after switching, an opacity threshold (threshold at each time within the display change period) is calculated. In this embodiment, a larger threshold is calculated as the size is smaller, using the larger one of the size of the image before switching and the size of the image after switching. Specifically, the threshold value is calculated using Equation 1 below. The reason why the threshold is increased as the image size is smaller is that when the opacity is the same, the smaller the size, the smaller the change in image quality due to the change in the set color space. In Equation 1, the reference threshold is the opacity threshold (40%) managed in the threshold table of FIG. The image size is the larger size (%) of the size of the image before switching and the size of the image after switching. The size of the image that is not displayed is 0%. The correction width is a value representing the influence of the image size on the opacity threshold, and is set to 8 in this embodiment. The correction width may be a value arbitrarily set by the user. The calculated threshold value is a threshold value calculated based on the size (threshold value used for calculating the small change period).

Calculation threshold = reference threshold + (100 / image size × correction width) (Equation 1)

In the example of FIG. 11, the opacity of the image A before switching gradually decreases from time T1110, and becomes 0% at time T1130 1000 msec after time T1110. The size of the image A before switching gradually decreases from time T1110 and reaches 40% at time T1130. For image B, the opacity gradually increases from time T1130, and reaches 100% at time T1140. The size of the image B gradually increases from time T1130 and reaches 100% at time T1140.
Therefore, the threshold at time T1130 is 60% (= 40% + (100/40% × 8)) according to Equation 1. Similarly, a threshold value at each time is calculated. As a result, as shown by the thick line in FIG. 11, the threshold value gradually increases from 40% to 60% during the period from time T1110 to time T1130, and gradually increases from 60% to 40% during the period from time T1130 to time T1150. To drop.

Next, the small change period is calculated by the same method as in the first embodiment using the calculated threshold value. In the example of FIG. 11, the period from time T1120 to time T1140 is calculated as the small change period. The time T1120 is a time 500 msec after the fade-out start time T1110 of the image A. A time T1140 is a time 500 msec after the fade-in start time T1130 of the image B. The length of the small change period is 1000 msec.
As described above, in this embodiment, the small change period can be calculated with higher accuracy than in the first embodiment by adjusting the threshold value based on the size. Specifically, in the example of FIG. 11, a period longer than that of the first embodiment can be calculated as the small change period.

  Then, based on the calculation result of the small change period, the timing for starting the change of the set color space is calculated. In the example of FIG. 11, time T1120 is calculated as the timing for starting the change of the set color space. As a result, as shown in FIG. 11, the change of the color space is started at the timing of time T1120.

  As described above, according to the present embodiment, the threshold value for the feature amount of the display effect focused on when calculating the small change period is calculated based on the other feature amount of the display effect. As a result, the small change period can be calculated with higher accuracy, and the process of reducing the change in image quality due to the change in the set color space or making it less noticeable can be performed with higher accuracy.

In this embodiment, the threshold value is calculated based on both the size of the image before switching and the size of the image after switching. However, one of the size of the image before switching and the size of the image after switching is set. A threshold value may be calculated based on this.
The formula for calculating the threshold is not limited to Formula 1. As long as the smaller the size, the higher the threshold value can be obtained, the threshold value may be calculated using any formula. The threshold value may be determined using a table representing the threshold value for each size.

<Example 5>
Hereinafter, a display control apparatus and a control method thereof according to Embodiment 5 of the present invention will be described.
In the fifth embodiment, an example in which there is no display effect in an image switching display such as a slide show will be described. That is, in the fifth embodiment, an example in which there is no display change period (when the length of the display change period is 0) will be described.
The configuration of the display device according to the present embodiment is the same as that of FIG. The processing flow of the display device according to the present embodiment will be described below with reference to FIG.

  First, in step S <b> 1201, the color space switching timing calculation unit 114 receives a determination result as to whether or not the set color space needs to be changed from the color space switching determination unit 111. At this time, in S <b> 1201, the color space switching determination unit 111 acquires set color space information from the image switching control unit 109.

  In step S <b> 1202, the color space switching determination unit 111 requests the image color space acquisition unit 110 to acquire color space information of the image B. Then, the image color space acquisition unit 110 outputs the extracted color space information of the image B to the color space switching determination unit 111.

  In step S1203, the color space switching determination unit 111 determines whether the setting color space needs to be changed based on the setting color space information acquired in step S1201 and the color space information acquired in step S1202. The determination result is notified to the color space switching timing calculation unit 114. When the current set color space represented by the set color space information acquired in S1201 and the color space represented by the color space information acquired in S1202 are different from each other, the color space switching determination unit 111 sets the set color. It is determined that the space needs to be changed. The current set color space represented by the set color space information acquired in S1201 is the color space of the image before switching, and the color space represented by the color space information acquired in S1202 is the color of the image after switching. It is space. Then, the process proceeds to S1204. On the other hand, when the color spaces are the same, the color space switching determination unit 111 determines that it is not necessary to change the set color space. Then, the process proceeds to S1207.

  Next, in S1204, the color space switching timing calculation unit 114 confirms a condition (color space switching determination condition) when switching the color space. In this embodiment, the presence / absence of a display effect and the set color space change time are confirmed as color space switching determination conditions. The color space switching timing calculation unit 114 refers to the display effect parameter set by the display effect parameter setting unit 112 and confirms that there is no display effect at the time of image switching. Then, the color space switching timing calculation unit 114 acquires, from the threshold storage unit 113, information representing the time required for changing the set color space (set color space change time). In this embodiment, the set color space change time is measured in advance, and information indicating the set color space change time measured in advance is stored in the threshold storage unit 113 in advance. When the set color space change time varies depending on the type of color space such as sRGB or AdobeRGB, information indicating the time for each condition (for example, the type of color space) is stored as information indicating the set color space change time. Just keep it. In the example of FIG. 13, information representing 200 ms, which is a set color space change time when switching from AdobeRGB to sRGB, is acquired.

In step S <b> 1205, the color space switching timing calculation unit 114 uses the set color space change time acquired in step S <b> 1204 to start changing the set color space (set the color space of the image B for the display device 100. Determine when to start. At this time, it is preferable to prioritize the image quality of the image after switching over the image quality of the image before switching. In this embodiment, the timing is determined so that the change of the color space is completed at the image switching timing. Accordingly, the timing is determined so that the change of the color space is started at a timing 200 ms before the image switching timing.

  In step S1206, the display effect processing unit 115 requests the color space setting unit 104 to change the set color space at the timing calculated in step S1205. The timing of this request is the set color space change start timing shown in FIG. The color space setting unit 104 changes the set color space in response to a request from the display effect processing unit 115. Specifically, the set color space is changed from AdobeRGB to sRGB (the color space of the image B is set for the display device 100).

  Finally, in S1207, the image to be displayed is switched. In the example of FIG. 13, the time required for changing the set color space (the time required for setting the color space for the display device 100; the set color space change time) is 200 msec. The display is switched from the A display 1031 to the image B display 1302.

As described above, according to this embodiment, when there is no display effect, the set color space is changed before the image is switched. Accordingly, since the image is switched immediately after the color space is changed, the change in the image quality due to the color space change is hardly left in the impression. When switching images, the user has a high degree of attention to the next image. Therefore, by eliminating the change in image quality with respect to the image to be viewed, it is possible to reduce the sense of discomfort felt by the user as a whole of the switching operation. .
In the present embodiment, the example in which the display is switched at the timing when the change of the set color space is completed has been described, but the present invention is not limited to this. It is only necessary to start changing the setting color space before the display is switched. With such a configuration, the change period of the image quality of the image after switching can be shortened. However, if the display is switched at the timing when the change of the set color space is completed, the change in the image quality of the image after the switching can be eliminated.

DESCRIPTION OF SYMBOLS 101 Display apparatus 102 Display panel 103 Display control part 104 Color space setting part 105 Image storage part 106 Decoder 107 1st frame buffer 108 2nd frame buffer 109 Image switching control part 110 Image color space acquisition part 111 Color space switching determination part 112 Display Effect parameter setting unit 113 Threshold storage unit 114 Color space switching timing calculation unit 115 Display effect processing unit

Claims (20)

A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period when the image is switched by the switching means, the opacity of the image before switching gradually decreases, and the opacity of the image after switching gradually increases ,
The setting means, the opacity of the period at a pre-switching by the switching means image in the display change period, the opacity of the image after the switching, or small change period in which both are in the following period threshold value In addition, the display control device is characterized in that a color space of the image after switching is set for the display device. Before Symbol setting means, claims opacity of the image after switching Rikae is a small change period in the following period threshold value, and sets the color space of the image after the switching to the display device The display control apparatus according to 1. A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period in which the image is switched by the switching means, the size of the image before switching gradually decreases, and the size of the image after switching gradually increases,
The setting means is a period within the display change period, the size of the image before switching, the size of the image after switching, or a small change period in which both are periods equal to or less than a threshold value for the display device. Table示制control device you and sets the color space of the image after the switching Te. The setting means sets the color space of the image after switching to the display device during a small change period in which the size of the image after switching is a period equal to or less than a threshold value.
The display control apparatus according to claim 3. A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period in which the image is switched by the switching means, the image before switching gradually moves out of the screen, and the image after switching gradually moves into the screen ,
The setting means is a period within the display change period and a ratio of an area where an image before switching is displayed with respect to the area of the screen, a ratio of an area where an image after switching is displayed with respect to the area of the screen, or , a small change period in which both are in the following period threshold value, the display table示制control apparatus you and sets the color space of the image after the switching to the device. The setting means sets the color space of the image after switching to the display device during a small change period in which the ratio of the area where the image after switching to the area of the screen is displayed is a threshold value or less.
The display control apparatus according to claim 5. A display control device that controls a display device that displays image data using display parameters corresponding to a set color space,
Switching means for switching an image to be displayed on the display device;
Setting means for setting a color space of an image to be displayed for the display device;
Have
During the display change period in which the image is switched by the switching means, the image before switching gradually moves out of the screen, and the image after switching gradually moves into the screen ,
The setting means is a period within the display change period and the moving speed of the image before switching, the moving speed of the image after switching, or a small change period in which both are periods of a threshold value or more. Table示制control device you and sets the color space of the image after the switching to the display device. When the time required for setting the color space for the display device is longer than the length of the small change period, the length of the small change period is equal to or longer than the time required for setting the color space for the display device. the display control device according to any one of claims 1 to 7, characterized by further comprising control means for controlling how the display changes the display device. The display control device according to claim 1, wherein the display parameter includes a parameter related to a setting value of a backlight of the display device. The display control device according to claim 1, wherein the display parameter includes a parameter related to image signal processing of the display device. A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the opacity of the image before switching gradually decreases, and the opacity of the image after switching gradually increases ,
In the setting step, the opacity of the period at a pre-switching by the switching step the image in the display change period, the opacity of the image after the switching, or small change period in which both are in the following period threshold value Further, a color space of the image after switching is set for the display device. In the previous SL setting step, wherein the opacity of the image after switching Rikae is a small change period in the following period threshold value, characterized in that the color space of the image after the switching to the display device is set Item 12. A display control device control method according to Item 11 . A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the size of the image before switching gradually decreases, the size of the image after switching gradually increases,
In the setting step, the display device is in a small change period that is a period within the display change period and is an image size before switching, an image size after switching, or both of which are periods below a threshold value. the method table示制control device characterized in that the color space of the image after the switching is set Te. In the setting step, the color space of the image after switching is set for the display device in a small change period in which the size of the image after switching is a period equal to or less than a threshold value.
The display control apparatus control method according to claim 13. A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the image before switching gradually moves out of the screen, the image after switching gradually moves into the screen ,
In the setting step, a ratio of a region within the display change period in which an image before switching with respect to the screen region is displayed, a proportion of a region in which the image after switching with respect to the screen region is displayed, or , method of controlling both the small change period which is the following period threshold value, the display device table示制control device you characterized in that the color space of the image after the switching is set for. In the setting step, the color space of the image after switching is set for the display device during a small change period in which the ratio of the area where the image after switching to the area of the screen is displayed is a threshold value or less.
The display control apparatus control method according to claim 15. A display control device control method for controlling a display device that displays image data using display parameters corresponding to a set color space,
A switching step of switching an image to be displayed on the display device;
A setting step for setting a color space of an image to be displayed on the display device;
Have
During the display change period in which the image is switched by the switching step, the image before switching gradually moves out of the screen, the image after switching gradually moves into the screen ,
In the setting step, a period within the display change period and the moving speed of the image before the switching, the moving speed of the image after the switching, or a small change period in which both are periods of a threshold value or more, the method table示制control device characterized in that the color space of the image after the switching to the display device is set. When the time required for setting the color space for the display device is longer than the length of the small change period, the length of the small change period is equal to or longer than the time required for setting the color space for the display device. control method of the display control device according to any one of claims 11 to 17, further comprising a control step of controlling the manner of display of the changes of the display device. 19. The display control device control method according to claim 11, wherein the display parameter includes a parameter related to a setting value of a backlight of the display device. 20. The display control device control method according to claim 11, wherein the display parameter includes a parameter related to image signal processing of the display device.

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