JP5146585B2 - Image correction apparatus, image correction method, and program - Google Patents

Description

  The present invention relates to an image correction apparatus, an image correction method, and a program that correct a captured image that has been captured and recorded in a predetermined capture mode at the time of capturing.

  Conventionally, a digital camera has a plurality of shooting modes according to the type of subject such as portrait, landscape, and night view, and if a shooting mode according to the type of subject is selected in advance, an image to be recorded at the time of shooting is recorded. In many cases, image processing conditions for the image, that is, image processing contents such as color enhancement, sharpness, saturation, white balance, and color filter, which are suitable for the subject are automatically set.

  In addition to the above, a variety of more specific subject types (hereinafter referred to as shooting scenes) are shown, and at the same time, a large number of sample images that serve as samples of shooting results are prepared, and the user intends to shoot from now on. A shooting scene similar to the subject being photographed or a shooting scene having an atmosphere according to preference is selected in advance through the sample image, and at the time of shooting, the aforementioned image quality adjustment conditions corresponding to the selected shooting scene are automatically set. A device having a photographing function (hereinafter referred to as a best shot photographing function) is known (for example, see Patent Document 1).

  With such a best shot shooting function, it is possible to provide a large number of shooting modes corresponding to a wide variety of shooting scenes, and at the same time, it is possible to easily and reliably set the above-described image quality adjustment conditions that match the user's intention during shooting. There is an advantage that you can.

JP 2002-10134 A

  By the way, even when a shooting mode corresponding to the subject type is prepared in advance in the digital camera as described above, shooting is often performed without setting any shooting mode for shooting for various reasons. In some cases, it is desired to add an intended atmosphere to a recorded image that has already been recorded after shooting. In such a case, if the user adjusts the image quality of the captured image on a personal computer using, for example, arbitrary image processing software (so-called retouch software), the captured image is captured according to a specific subject type at the time of capturing. It is possible to process an image having the same atmosphere as when the mode is used. However, such image quality adjustment work of a captured image is complicated. In addition, since the image quality adjustment work requires a certain amount of experience and knowledge, there is a problem that not everyone can easily perform it.

  The present invention has been made in view of such a conventional problem, and anyone can easily shoot a recorded image by setting a shooting mode according to a specific subject type. An object of the present invention is to provide an image correction apparatus and an image correction method capable of correcting an image having a similar atmosphere, and a program used for realizing them.

The image correction apparatus according to the present invention employs a selection control unit that allows a user to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types, and an imaging condition corresponding to a specific subject type. A shooting condition corresponding to the predetermined shooting mode and an image quality correction condition corresponding to the correction mode selected by the user by the selection control unit for a shot image shot and recorded in the predetermined shooting mode. And correction means for performing correction processing according to a difference condition corresponding to the difference.
In addition, an image correction apparatus according to another aspect includes a selection control unit that allows a user to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types, and photographing corresponding to a specific subject type. The image quality of a photographed image recorded and recorded in a predetermined photographing mode to which the condition is applied is excluded from the photographing conditions corresponding to the predetermined photographing mode when photographing the photographed image. The first correction means for correcting the image quality to the standard image quality corresponding to the case where the standard shooting conditions are applied, and the image quality of the captured image after being corrected to the standard image quality by the first correction means are selected. And a second correction unit that re-corrects the control unit according to the image quality correction condition corresponding to the correction mode selected by the user.
In the image correction method according to the present invention, a step of allowing a user to select a desired correction mode from among a plurality of correction modes respectively corresponding to a plurality of subject types and a shooting condition corresponding to a specific subject type are applied. A difference condition corresponding to the difference between the shooting condition corresponding to the predetermined shooting mode and the image quality correction condition corresponding to the correction mode selected by the user for a shot image shot and recorded in the predetermined shooting mode. And a step of performing a corresponding correction process.
An image correction method according to another aspect includes a step of causing a user to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types, and a shooting condition corresponding to a specific subject type. The image quality of the captured image recorded and recorded in the applied shooting mode is a standard value obtained by excluding conditions specific to the specific subject type from shooting conditions corresponding to the predetermined shooting mode when shooting the shot image. The process of correcting to the standard image quality corresponding to the case where the shooting conditions were applied, and the image quality of the shot image after correction to the standard image quality are recorrected according to the image quality correction conditions corresponding to the correction mode selected by the user. And a step of re-correction.
In the program according to the present invention, a process for causing a computer to select a desired correction mode from among a plurality of correction modes respectively corresponding to a plurality of subject types and a shooting condition corresponding to a specific subject type are applied. A difference condition corresponding to a difference between a shooting condition corresponding to the predetermined shooting mode and an image quality correction condition corresponding to the correction mode selected by the user for a shot image shot and recorded in the predetermined shooting mode. And a process of performing a correction process according to the above.
In addition, the program according to another aspect includes a process for causing the computer to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types, and shooting conditions corresponding to a specific subject type. A standard in which the image quality of a photographed image recorded and recorded in a photographing mode to which is applied is excluded from the photographing conditions corresponding to the predetermined photographing mode when the photographed image is photographed. The processing for correcting the image quality to the standard image quality equivalent to when the image capturing conditions are applied and the image quality of the captured image after the image quality is corrected to the standard image quality are determined in advance according to the correction mode selected by the user. And a re-correction process for re-correction according to the image quality correction condition.

  According to the present invention, anyone can easily correct a shot image that has already been shot into an image having the same atmosphere as when shot with a shooting mode according to a specific subject type. Is possible.

1 is a block diagram of a digital camera according to the present invention. It is the conceptual diagram which showed the storage data of an image memory. It is the figure which showed the imaging condition table. It is a conceptual diagram which shows the data structure of an image file. It is explanatory drawing which shows the outline of operation | movement in recording mode and reproduction | regeneration mode. It is the flowchart which showed the processing content of MPU in reproduction | regeneration mode. It is a figure corresponding to FIG. 3 which showed the other imaging condition table in case a mechanical condition is included in imaging conditions.

  Hereinafter, preferred embodiments of the present invention will be described. In the present embodiment, the best shot shooting function described above and a function for correcting the image quality of a shot image (recorded image) shot using the best shot shooting function to an image quality corresponding to a shooting scene different from that at the time of shooting (hereinafter, referred to as a shot image) And a reproduction best shot function), and a digital camera including the image correction apparatus of the present invention.

  FIG. 1 is a block configuration diagram showing an outline of an electrical configuration of the digital camera 1. The digital camera 1 includes a CCD 2 that is an imaging unit, and is configured mainly with an MPU 3 that has an image processing function that compresses and expands an image captured by the CCD 2 and generates and reproduces an Exif image file.

  An optical image of the subject is formed on the light receiving surface of the CCD 2 through an optical system 4 and a diaphragm 6 that constitute a zoom lens, a focus lens, and the like. The optical system 4 is held by a drive mechanism 5 including an AF motor, a zoom motor, and the like, and a drive signal output from the optical system drive unit 7 is supplied to the drive mechanism 5 by a control signal from the MPU 3, whereby the optical axis. Driven back and forth. The diaphragm 6 is driven by a drive signal generated by the diaphragm driver 8 based on a control signal from the MPU 3 and adjusts the amount of light of the subject image incident on the CCD 2.

  On the other hand, the MPU 3 is connected with a TG (Timing Generator) 9 that generates a timing signal, and the CCD 2 is driven by a drive signal generated by a V driver 10 (vertical driver) based on the timing signal generated by the TG 9. Then, an analog imaging signal corresponding to the luminance of the subject image is output to the analog signal processing unit 11.

  The analog signal processing unit 11 includes a gain adjustment amplifier (AGC) that is an analog amplifier, a CDS circuit (Correlated Double Sampling), and an A / D converter (AD) that converts it into a digital signal. The output signal of the CCD 2 is sampled in accordance with the black level and sent to the MPU 3 as a digital signal.

  The MPU 3 is connected with an operation key unit 12, a TFT liquid crystal monitor 13, a strobe 14, a DRAM 15, an MROM 16, and an image memory 17.

  The operation key unit 12 includes a power key, a shutter key, various mode setting keys, a menu key, a cross key, a set key, and the like, and signals associated with these key operations are sent directly to the MPU 3. In the present embodiment, the mode setting key includes a recording mode key for setting a recording mode for shooting, which is a basic operation mode of the digital camera, and a playback mode key for setting a playback mode for reproducing a recorded image. The best shot key (BS key) for instructing the use of the best shot photographing function in the recording mode.

  The strobe 14 includes an arc tube that emits auxiliary light at the time of shooting based on a command from the MPU 3 and a drive circuit thereof.

  The DRAM 15 is a working memory, and the image memory 17 is an image recording memory composed of various memory cards. A digital signal (imaging signal) sent from the CCD 2 to the MPU 3 is temporarily stored in the DRAM 15 and MPU 3 Are subjected to various image processing, and further compressed and encoded by a JPEG (Joint Photograph Coding Experts Group) method, and then recorded in the image memory 17 as image data.

  The image data recorded in the image memory 17 is read out to the MPU 3 as necessary, and is generated into a digital video signal or an analog video signal through processing such as expansion processing, addition of a luminance signal and a color signal, and a TFT liquid crystal monitor. 13 is displayed. In addition, on the TFT liquid crystal monitor 13, an image periodically captured in the recording mode is displayed as a through image.

  The MROM 16 is a program ROM in which various operation programs necessary for control of each unit and data processing in the MPU 3 are recorded. The MROM 16 also stores program AE data constituting a program diagram showing a combination of an aperture value (F) corresponding to an appropriate exposure value (EV) at the time of shooting and a shutter speed.

  The MPU 3 performs AE control by controlling the charge accumulation time of the CCD 2, which is the shutter speed, the degree of opening of the diaphragm 5, and the gain of the gain adjustment amplifier (AGC) of the analog processing unit 11 according to the program diagram. Also, AF (auto focus) control and AWB (auto white balance) control for driving the focus lens are performed according to a predetermined program. Further, when a shooting operation is performed when the shutter key is pressed, the emission of the auxiliary shooting light by the flash 14 and the emission amount are controlled as necessary.

  Further, when the BS key described above is pressed in the recording mode for shooting, the MPU 3 performs control related to display of a sample image or the like and setting of shooting conditions according to the sample image (shooting scene) selected by the user. . Further, when the BS key is pressed in the reproduction mode, processing described later including display of a sample image or the like is performed according to the key operation by the user, and the selection control means, first correction means, and second correction of the present invention are performed. Functions as a means.

  In addition, as shown in FIG. 2, the image memory 17 has a storage area other than the storage area for storing captured image data (image file) 101 acquired by capturing, when the best shot capturing function is used, Sample image data 102 and photographing condition data 103 used in the reproduction mode are stored. The sample image data 102 is data of a plurality of sample images corresponding to various subject types (photographing scenes).

  The shooting condition data 103 is data constituting the shooting condition table T illustrated in FIG. This data is composed of shooting condition names and shooting parameters managed by shooting condition numbers, and the shooting condition names and shooting parameters correspond to the plurality of sample images. The shooting parameters are data indicating shooting conditions for obtaining a shooting result equivalent to the corresponding sample image, and more specifically, color enhancement, sharpness, saturation, white balance, It is a parameter indicating the setting contents of a plurality of control items such as filters. The sample image data 102 and the photographing condition data 103 are not limited to the image memory 17 and may be stored in the MROM 16.

  On the other hand, FIG. 4 is a conceptual diagram showing the data structure of an image file recorded in the image memory 17 at the time of shooting, that is, an Exif format image file. The Exif standard image file is a header for identifying the Exif standard file, tag information including various information related to the image data, and additional image information including thumbnail image data, and the original thumbnail image data. The original image data (compressed data of the photographed image). The tag information includes a manufacturer note portion in which information unique to the manufacturer is described, and other portions. In the image file recorded by shooting with the best shot shooting function, the shooting condition number described above is described in the maker note portion as shown in the figure, and general shooting parameters are described in the other portion together with file information and the like. Note that the manufacturer's own shooting parameters are also described in the manufacturer's note part.

  The digital camera 1 operates as follows when the recording mode is set and when the playback mode is set. First, an outline of operations in the recording mode and the reproduction mode will be described.

  That is, FIG. 5A is an explanatory diagram showing an outline of the operation when shooting using the best shot shooting function is performed in the recording mode. When the BS key is pressed when the digital camera 1 is in a shooting standby state in which the through image 201 is displayed on the TFT liquid crystal monitor 13 in the recording mode, the digital camera 1 displays the scene selection screen 202 including the above-described plural sample images and the like. To select and determine a desired shooting scene.

  Then, after any shooting scene is selected / determined, the camera returns to the shooting standby state again. When the shutter key is pressed in this state, the shooting conditions corresponding to the selected shooting scene (sample image) are followed. Perform the shooting operation. That is, the subject is photographed by photographing in a predetermined photographing mode and recorded as an image file.

  On the other hand, FIG. 5B is an explanatory diagram showing an outline of the operation when the above-described reproduction best shot function is used in the reproduction mode. When the BS key is pressed when the digital camera 1 is in a playback state in which an arbitrary recorded image (captured image) 211 is displayed on the TFT liquid crystal monitor 13 in the playback mode, the scene selection including the plurality of sample images described above is selected. A screen 202 is displayed to allow the user to select and determine a desired shooting scene. The scene selection screen 202 displayed here is the same as that displayed in accordance with the operation of the BS key in the recording mode.

  After any of the shooting scenes is selected / determined, the image quality of the recorded image being played back is corrected according to the shooting conditions corresponding to the determined shooting scene (sample image), that is, the image quality in a predetermined playback mode. Correction is performed, and the corrected image (hereinafter referred to as a corrected image) 212 is once displayed on the TFT liquid crystal monitor 13. Further, when the shutter key is pressed in this state, a new image file is created and recorded on the corrected image 212 being displayed separately from the recorded image.

  FIG. 6 is a flowchart showing the contents of the process according to the present invention executed by the MPU 3 after an arbitrary recorded image is selected by the user in the playback mode.

  As will be described below, when an arbitrary recorded image is selected, the MPU 3 reads compressed data (image file) of the selected recorded image (photographed image) from the image memory 17, decompresses it, and expands it in the DRAM 15. Then, it is displayed on the TFT liquid crystal monitor 13 (step S1). Subsequently, the MPU 3 determines whether or not the BS key has been operated by the user. If the BS key has not been pressed (NO in step S2), the MPU 3 returns to step S1 and displays the recorded image 211 (see FIG. 5B). Continue to display.

  On the other hand, if the BS key is pressed (YES in step S2), the sample image data 102 stored in the image memory 17 and a part of the shooting condition data 103 (shooting condition number and shooting condition name) are read out. The above-described scene selection screen 202 (see FIG. 5B) is displayed on the TFT liquid crystal monitor 13 (step S3), and the user selects a desired shooting scene (sample image) by a predetermined key operation. Prompt.

  Eventually, if there is an operation for determining the shooting scene (YES in step S4), one of the shooting parameters shown in FIG. 3 corresponding to the shooting condition number added to the recorded image 211 being displayed, that is, applied during shooting. The recorded shooting parameters are read (step S5), and based on the read shooting parameters, the recording image 211 (image data in the DRAM 15) is subjected to inverse conversion correction processing, and the image quality is corrected to the standard image quality (step S6).

  That is, by performing image processing opposite to the image processing performed at the time of shooting, the image quality of the recorded image 211 being displayed is set to the best when the image processing based on the shooting parameters is not performed at the time of shooting. The image quality is corrected to the standard image quality corresponding to the case where shooting using the shot shooting function has not been performed. More specifically, for example, when shooting parameters corresponding to the shooting condition number “2” and the shooting condition name “landscape shooting” shown in FIG. 3 are applied during shooting, the sharpness is set to “+2” during shooting. Since image processing for setting the saturation to “+2” is performed, image processing for setting the sharpness to “−2” and the saturation to “−2” is performed here.

  Furthermore, the shooting parameters corresponding to the shooting scene previously selected by the user on the scene selection screen 202 are read from the image memory 17 (step S7), and the image corrected to the standard image quality as described above is read according to the shooting parameters. Re-correction is performed (step S8). That is, the image processing according to the content is performed on the image in the standard image quality state with the image capture parameter of the newly selected image capture scene as the image quality correction condition. More specifically, for example, when the newly selected shooting parameter corresponds to the shooting condition number “6” and the shooting condition name “green vividly” shown in FIG. Color enhancement is performed, image processing is performed with a sharpness of “+2” and a saturation of “+2”.

  Thereafter, the image at this time is displayed on the TFT liquid crystal monitor 13 as a final corrected image 212 (see FIG. 5B) (step S9). After the corrected image 212 is displayed, if correction determination by pressing the shutter key is instructed (YES in step S10), the corrected image 212 is stored in the image memory as a new image file separately from the recorded image 211 before correction. 17 (step S11). If there is a change instruction by a predetermined key operation (NO in step S10), the process returns to the above-described step S3, the scene selection screen 202 is displayed on the TFT liquid crystal monitor 13, and the desired shooting scene ( Select the sample image) again. Thereafter, the above-described operation is repeated.

  As described above, in the digital camera 1 of the present embodiment, the recorded image 211 (photographed image) that has already been photographed is the same as when the photographed image is photographed in a photographing mode corresponding to a specific subject type, that is, a photographing scene. It is possible to correct an image having the atmosphere. In addition, at that time, as shown in FIG. 5, the user only has to perform an operation of selecting a desired shooting scene after pressing the BS key to display the scene selection screen 202 and recording the recorded image. Anyone can easily perform the correction work. Further, since the procedure is the same as that in the case of shooting using the best shot shooting function, the usability is very good.

  Furthermore, even if the shot image to be corrected is shot using the best shot shooting function and the shooting conditions according to the specific shooting scene (subject type) are applied at the time of shooting, the image quality of the recorded image is temporarily reduced. After returning to the standard image quality, correction is performed according to the shooting conditions corresponding to the newly selected shooting scene (subject type). It can be corrected. In other words, the same atmosphere as when shooting in a shooting mode different from the shooting mode is given to a shot image shot and recorded in a shooting mode to which specific shooting conditions according to the subject type are applied. Can do.

  As a result, for example, even when the user's intention changes between shooting and after shooting, it is possible to cope with it, and the user can always obtain a shot image of the intended atmosphere.

  Here, in this embodiment, for the sake of convenience, the description has been made assuming that the recorded image to be corrected is only the one shot using the best shot shooting function. However, in reality, the recorded image to be corrected is the best. In some cases, the shot was taken without using the shot shooting function. Therefore, when the present invention is actually implemented, the MPU 3 is caused to perform the following processing.

  For example, immediately after the above-described step S4, by confirming the data of the above-described maker note portion of the image file, the recorded image 211 being displayed that has been corrected is captured using the best-shot imaging function. If the determination result is YES, the inverse transformation correction process of step S5 described above is performed as it is, whereas if the determination result is NO, the process determines whether the determination result is NO. Then, the following steps S5 and S6 are skipped, and the process proceeds to step S7. In step S8, correction processing for the recorded image 211 being displayed is performed.

  As a result, even when the recorded image to be corrected is taken without using the best shot shooting function, the recorded image is shot in a shooting mode corresponding to a specific subject type (shooting scene). It is possible to correct to an image having the same atmosphere as in the case where the image has been displayed.

  In the present embodiment, in the above-described inverse transformation correction process in step S6, the shooting scene selected at the time of shooting, that is, the shooting parameters (shooting conditions) applied at the time of shooting are used as the manufacturer note part of the image file. Judgment is made from the photographing condition number described in (1) (see FIG. 4), but it can be as follows.

  For example, as described above, since the shooting parameter used at the time of shooting is described in the maker note portion, the above-described inverse conversion correction processing can be performed based on the shooting parameter. In this case, for example, in the other digital camera having the best shot shooting function and the playback best shot function similar to those of the digital camera 1 of the present embodiment, the playback best shot function is stored in the image memory 17. There may be cases where the contents of the sample image data 102 and the shooting condition data 103 are different, that is, some or all of the shooting scenes that can be selected at the time of shooting do not match. If the inverse transformation correction processing described above is performed based on the described shooting parameters, correction after shooting can be performed without any problem.

  In the present embodiment, as described above, after performing the inverse transformation correction process in step S6, the re-correction process is further performed in step S8, that is, different two-stage image processing (image quality adjustment process) is performed. In the above description, the final corrected image 212 is acquired. However, instead of the two-stage image processing, the following processing may be performed. That is, image processing corresponding to the content of the shooting parameter (difference condition) corresponding to the difference between the shooting parameter applied at the time of shooting and the shooting parameter corresponding to the shooting scene selected at the time of playback is performed. Image processing in stages may be performed by a batch correction process.

  More specifically, for example, for a recorded image in which the shooting condition number “2” at the time of shooting and the shooting scene name “landscape shooting” is selected, the shooting condition number is set at the time of playback (at the time of correction). When a shooting scene with a shooting condition name of “green vivid” is selected, only color enhancement for “green” may be performed. Even in that case, the same correction effect as in the present embodiment can be obtained.

  In the above description, the shooting conditions determined corresponding to each shooting scene that can be selected in the recording mode are “color enhancement”, “sharpness”, and “saturation” as shown in FIG. The control content realized by performing predetermined image processing at the time of shooting as described above, that is, the case where it is configured by the image quality adjustment conditions in the present invention has been described, but depending on the shooting scene, In some cases, the control content realized by the photographing operation other than the processing, that is, the mechanical condition in the present invention is included.

  The mechanical conditions include, for example, photographing conditions relating to the control contents of the photographing optical system such as “focus” and “aperture”, “shutter speed” realized by controlling the charge accumulation time of the CCD 2, charge accumulation time of the CCD 2, and analog Shooting conditions relating to the control contents of the imaging circuit system such as “EV shift” realized by controlling the gain of the gain adjustment amplifier (AGC) of the signal processing unit 11, other than the imaging optical system and imaging circuit system such as “strobe light emission” This is an imaging condition realized by control of the constituent parts. Note that more specific shooting conditions (contents of control of a plurality of shooting parameters) including such mechanical conditions will be described later. In addition, when the shooting conditions include mechanical conditions, it is desirable to do the following.

  First, as in the present embodiment, in the configuration in which the final corrected image 212 is acquired by two-stage image processing that is different from the inverse transformation correction processing (step S6) and the recorrection processing (step S8), the following is performed. To. That is, when the above-described mechanical condition is included in the photographing condition at the time of photographing, it is desirable that the processing content of the inverse transformation correction process is the processing content corresponding to the mechanical condition. For example, in the inverse transformation correction process, in addition to the process described above, an image process having a content opposite to that of the image process capable of obtaining an effect close to the effect of the mechanical condition is performed. In that case, the image quality of the recorded image can be corrected to a more realistic standard image quality.

  In this case, the standard image quality that is the correction target in the inverse conversion correction processing is the image quality corresponding to the case where simple AE control is performed at the time of shooting, that is, depending on the state of the subject regardless of the specific subject type. The image quality may correspond to the case where the set shooting conditions are applied. In addition, the image quality corresponding to the case where the shooting conditions in which the setting values of the aperture and shutter speed are set to predetermined values that are assumed in advance as reference are applied, that is, irrespective of the specific subject type, The image quality corresponding to the case where the predetermined shooting condition is applied may be used.

  Further, when the above-described mechanical condition is included in the shooting condition (image quality correction condition) at the time of reproduction (correction), the processing content of the re-correction processing is set to the processing content according to the above-described mechanical condition. It is desirable. For example, in the re-correction processing, image processing capable of obtaining an effect close to the effect due to the mechanical condition is performed. In that case, the image quality of the final corrected image can be made closer to the image quality when the shooting conditions of the shooting scene specified at the time of reproduction are applied at the time of actual shooting.

  Furthermore, for example, an image recognition process or an image recognition process may be included in the inverse transformation correction process or the recorrection process according to the mechanical condition described above. In that case, it is possible to separate a specific subject (main subject such as a person) from the background and perform different image quality adjustments on each.

  In addition, as described above, unlike the present embodiment, the above-described mechanical condition is included in the photographing condition (image quality correction condition) even in the configuration in which the inverse transformation correction process and the recorrection process are performed collectively. In this case, if the processing according to the mechanical condition is performed when performing the inverse transformation correction processing and the recorrection processing in a batch, the final corrected image quality can be obtained for the shooting scene specified at the time of playback. It is possible to approach the image quality when the condition is applied at the time of actual shooting.

  Of course, in this case, since the content of the correction processing differs depending on the combination of the shooting conditions at the time of shooting and the shooting conditions (image quality correction conditions) at the time of playback (correction), A plurality of types of difference conditions corresponding to combinations of conditions are stored in advance in the image memory 17 or the like, and when correcting, the difference conditions corresponding to the combination of shooting conditions at the time of shooting and playback are appropriately read out, and the difference conditions The correction process according to the above may be performed.

  Here, specific shooting conditions in the case where the mechanical conditions described above are included, details of processing at the time of shooting, and details of correction processing (image quality adjustment processing) for the corresponding recorded image explain. FIG. 7 is a diagram showing an example of another shooting condition table Tn in the case where the above-mentioned mechanical conditions are included in each shooting condition corresponding to a shooting scene that can be selected by the best shot shooting function. 3 corresponds to FIG. In this shooting condition table Tn, shooting parameters are composed of control items such as “focus”, “aperture”, “shutter speed”, “EV shift”, “white balance”, “flash emission”, and “saturation”. . Further, each shooting parameter (control item) corresponds to each shooting condition name (shooting scene) such as “night view”, “night person”, “person and night view”, “flower”, “backlit person”. Control details are set.

  Note that “white balance” in the shooting parameters is a shooting condition realized by predetermined image processing as in the present embodiment. For example, the gain adjustment amplifier (AGC) of the analog processing unit 11 described above is the main shooting parameter. Unlike the embodiment, the configuration is such that the gain of the imaging signal can be adjusted for each of the RGB colors, and is adjusted by the gain balance adjustment of the gain adjustment amplifier. The imaging conditions (mechanical conditions) realized by

  Hereinafter, processing contents at the time of shooting according to each shooting condition illustrated in FIG. 7 and contents of correction processing (image quality adjustment processing) for the corresponding recorded image will be described.

  The shooting condition name “night view” is for shooting at night while maintaining the night atmosphere with the scenery (far view) as the main. At the time of shooting based on such shooting conditions, “focus” is set to the spot AF mode in which the measurement range of the AF evaluation value is narrow, and it is assumed that there is not enough light at night and the strobe light does not reach the distant view. The “aperture” and “shutter speed” are automatically set (set values according to the AE control) for the purpose of ensuring the brightness in the standard state regardless of the distance to the subject. At the same time, in order to maintain a night atmosphere, the EV value is shifted (corrected) up to about +2 EV and shooting is performed.

  Therefore, in the correction process for the recorded image when “night scene” is selected as the shooting scene, for example, the average brightness of the entire image is obtained, and the brightness of the entire image is uniformly set so that the average brightness becomes a predetermined value. By correcting to, an image having the same atmosphere as when the above-described shooting scene is selected at the time of shooting is obtained.

  The shooting condition name “person at night” is for performing night shooting with a person (near view) as the main subject. At the time of shooting based on such shooting conditions, “focus” is set to the spot AF mode, and since it is not necessary to take a landscape (distant view) brightly, “strobe flash” is set to forced flash, and “aperture” and “shutter speed” are set. "Is automatically set so that only the person (near view) appears bright. At the same time, in order to maintain the night atmosphere, the EV value is increased (corrected) to a limit of about 1 EV, and the “saturation” is further increased by one stage.

  Therefore, in the correction process for the recorded image when “person at night” is selected as the shooting scene, for example, if the luminance correction is performed on the entire image, even the background portion where the strobe light does not reach is corrected. In order to reproduce the shooting state of the same atmosphere as when shooting, the outline of the person part is detected by image processing, and the brightness correction is selectively performed on the person part, so that the shooting scene is selected at the time of shooting. Thus, an image having an atmosphere similar to that in the case where the image has been displayed is obtained.

  The shooting condition name “person and night view” is for performing night shooting with both a person (near view) and a landscape (distant view) as main subjects. At the time of shooting based on such shooting conditions, “focus” is set to the spot AF mode, and “strobe emission” is forcedly emitted to ensure the brightness of the person (near view). At the same time, the brightness of the landscape (distant view) is ensured by automatically setting the “shutter speed” because the brightness of the person (near view) will be corrected twice if the “aperture” is set to automatic. To do.

  Therefore, in the correction processing for the recorded image when “person and night view” is selected as the shooting scene, for example, image data that widens between the lowest luminance portion and the highest luminance portion in the luminance histogram distribution of the entire image. By performing the conversion and maintaining the contrast, an image having an atmosphere similar to that in the case where the shooting scene is selected at the time of shooting is obtained.

  The shooting condition corresponding to the shooting condition name “flower” is for shooting mainly with a flower. When shooting based on such shooting conditions, focus on the flower to blur the background, so the focus is set to macro mode with the focus range within several centimeters and the depth of field is shallow. Set “aperture” to F3 or less. In addition, “saturation” is increased by one level.

  Therefore, in the correction process for the recorded image when “flower” is selected as the shooting scene, for example, the outline of the flower part is detected by image processing and the background part other than the flower is blurred. Further, by improving the saturation by image processing, an image having the same atmosphere as when the above-described shooting scene is selected at the time of shooting is obtained.

  The shooting condition corresponding to the shooting condition name “backlit person” is for shooting with the person as the main subject in the backlit state. When shooting based on these shooting conditions, “Focus” is set to a multi-area mode with a wide AF evaluation value measurement range, “Flash emission” is set to forced flash, EV shift is set to +3 EV, and “Saturation” is increased by one step. Let's shoot.

  Therefore, in the correction process for the recorded image when “backlit person” is selected as the shooting scene, for example, the contour of the person part is detected by image processing, and brightness correction is selectively performed on the person part. Thus, an image having the same atmosphere as when the above-described shooting scene is selected at the time of shooting is obtained.

  In the present embodiment, when correcting a recorded image, a user is allowed to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types by an operation for selecting a shooting scene (sample image). However, the method for allowing the user to select a desired correction mode is arbitrary. However, in the case where the present invention is applied to a digital camera having the best shot shooting function, if the correction mode is selected by a shooting scene (sample image) selection operation, as described above, the best shot shooting function is used. This is advantageous in that the correction work can be performed with the same feeling as in the case of shooting using the.

  Furthermore, in the present embodiment, the scene selection screen 202 is displayed according to the user's key operation while an arbitrary recorded image is displayed in the playback mode, and the correction according to the present invention is performed on the displayed recorded image. The processing is performed, but it may be as follows.

  For example, after the scene selection screen 202 is displayed according to the user's key operation in any mode and the user selects a desired shooting scene (correction mode), shooting conditions corresponding to the selected shooting scene are displayed. The user is allowed to select one or a plurality of recorded images to be subjected to correction processing based on the file name by an arbitrary method such as a file name selection operation. Thereafter, the above-described correction processing may be performed on one or a plurality of selected recorded images.

  In that case, correction processing based on the same shooting condition can be performed collectively on a plurality of recorded images. For example, a plurality of images recorded by shooting the same subject a plurality of times while changing framing are recorded. Correction work when the same effect (atmosphere) is given to a single recorded image is facilitated.

  Further, in the present embodiment, the case has been described in which the captured image to be corrected is a captured image that has been captured and recorded using the best shot capturing function. However, the captured image to be corrected corresponds to a specific subject type at the time of capturing. If the shooting conditions were applied, for example, those shot and recorded by a digital camera configured to directly select a shooting mode according to the type of subject, that is, shooting conditions according to a specific subject type at the time of shooting May be applied. Further, the captured image to be corrected may be captured by a device other than a digital camera, such as a digital video camera, a mobile phone terminal having a photographing function, or a PDA.

  Further, the present invention can be applied to other apparatuses including a personal computer other than the digital camera regardless of the presence or absence of the photographing function. Furthermore, the present invention is not limited to still images, but is effective when image quality adjustment is performed on a moving image to which shooting conditions according to a specific subject type are applied at the time of shooting.

1 Digital camera 2 CCD
3 MPU
6 Aperture 12 Operation key section 13 TFT LCD monitor 15 DRAM
16 MROM
17 Image memory 102 Sample image data 103 Shooting condition data 201 Through image 202 Scene selection screen 211 Recorded image 212 Correction image T Shooting condition table Tn Other shooting condition table

Claims (21)

Selection control means for allowing the user to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types;
With respect to a photographed image recorded and recorded in a predetermined photographing mode to which a photographing condition corresponding to a specific subject type is applied, the user selects the photographing condition corresponding to the predetermined photographing mode and the selection control means. An image correction apparatus comprising: correction means for performing correction processing according to a difference condition corresponding to a difference from the image quality correction condition corresponding to the correction mode. The correction means is a correction process according to the difference condition for the captured image, and a predetermined mechanical condition specific to a subject type included in the shooting condition corresponding to the predetermined shooting mode. The image correction apparatus according to claim 1, wherein a correction process in which a process content according to a predetermined mechanical condition realized by a shooting operation other than the process is reflected is performed. The predetermined mechanical condition specific to the subject type included in the shooting condition corresponding to the predetermined shooting mode includes at least a shooting condition regarding either the control content of the shooting optical system or the control content of the imaging circuit system. The image correction apparatus according to claim 2 , wherein the correction unit performs a correction process in which a processing content corresponding to the predetermined mechanical condition is reflected on the photographed image. Sample image storage means for storing a plurality of sample images corresponding to a plurality of subject types;
Display means for displaying a sample image stored in the sample image storage means,
The selection control means displays a plurality of sample images stored in the sample image storage means on the display means, and selects a correction mode desired by the user by selecting one of the displayed sample images. The image correction apparatus according to claim 1, wherein the image correction apparatus includes: Wherein the correction means, according to claim 1, wherein the imaging conditions corresponding to the predetermined imaging mode that was applied at the time of photographing of the photographic image, it is determined on the basis of a predetermined photographing condition information associated with the captured image 5. The image correction device according to any one of 4 to 4 . To any one of claims 1 to 5 applied imaging conditions different from each other a plurality of shooting modes, characterized in that provided on the selectively settable camera device at the time of photographing with corresponding to a plurality of type of subject The image correction apparatus described. Difference condition storage means for storing a plurality of the difference conditions corresponding to each combination of the plurality of shooting modes and the plurality of correction modes;
The correction process is the difference condition stored in the difference condition storage unit with respect to the captured image displayed on the display unit, wherein the predetermined shooting mode and the selection control unit are selected by the user. The image correction apparatus according to claim 1 , wherein correction processing is performed according to a difference condition corresponding to the combination with the corrected correction mode. Selection control means for allowing the user to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types;
The image quality of a captured image shot and recorded in a predetermined shooting mode to which a shooting condition corresponding to a specific subject type is applied is determined based on the shooting condition corresponding to the predetermined shooting mode at the time of shooting the captured image. First correction means for correcting the image quality to a standard image quality corresponding to a case where standard shooting conditions excluding conditions specific to the subject type are applied;
Second correction means for re-correcting the image quality of the captured image after being corrected to the standard image quality by the first correction means in accordance with the image quality correction condition corresponding to the correction mode selected by the user by the selection control means; An image correction apparatus comprising: The standard image quality corresponding to the case where the standard shooting condition is applied corresponds to the case where the shooting condition set according to the state of the subject is applied at the time of shooting regardless of the specific subject type. The image correction apparatus according to claim 8 , wherein the image correction apparatus has an image quality to be performed. The standard image quality corresponding to the case where the standard shooting condition is applied is the image quality corresponding to the case where a predetermined shooting condition is applied at the time of shooting regardless of the specific subject type. The image correction apparatus according to claim 8 . The first correction unit includes an image process that includes, in the captured image, processing content that is opposite to the image processing according to a predetermined image quality adjustment condition specific to a subject type included in an imaging condition corresponding to the predetermined imaging mode. The image correction apparatus according to claim 8 , wherein the image quality of the photographed image is corrected to the standard image quality by performing the above. The first correction means includes processing contents opposite to image processing corresponding to a predetermined image quality adjustment condition specific to a subject type included in the shooting condition corresponding to the predetermined shooting mode, and Image processing including predetermined mechanical conditions specific to the subject type included in the shooting conditions corresponding to the shooting mode and processing contents according to predetermined mechanical conditions realized by shooting operations other than image processing 12. The image correction apparatus according to claim 8, wherein the image correction device corrects the image quality of the captured image to the standard image quality. The predetermined mechanical condition specific to the subject type included in the shooting condition corresponding to the predetermined shooting mode includes at least a shooting condition regarding either the control content of the shooting optical system or the control content of the imaging circuit system. The image correction apparatus according to claim 12 , wherein the first correction unit performs image processing including processing content according to the predetermined mechanical condition on the captured image. Sample image storage means for storing a plurality of sample images corresponding to a plurality of subject types;
Display means for displaying a sample image stored in the sample image storage means,
The selection control means displays a plurality of sample images stored in the sample image storage means on the display means, and selects a correction mode desired by the user by selecting one of the displayed sample images. An image correction apparatus according to claim 8, wherein The first correction unit determines a shooting condition corresponding to the predetermined shooting mode applied at the time of shooting the shot image based on predetermined shooting condition information attached to the shot image. The image correction apparatus according to claim 8 . Provided in a camera device that can selectively set a plurality of shooting modes corresponding to a plurality of subject types and having different shooting conditions applied at the time of shooting,
The selection control means allows the user to select a desired correction mode from a plurality of correction modes respectively corresponding to the plurality of subject types,
The second correction means uses the shooting condition applied when setting the shooting mode corresponding to the same subject type as the correction mode selected by the user by the selection control means as the image quality correction condition as the first correction. The image correction apparatus according to claim 8, wherein the image quality of the captured image corrected by the means is recorrected . The second correction unit has a predetermined mechanical condition specific to the subject type included in the shooting condition as the image quality correction condition for the shot image corrected by the first correction unit, and other than image processing. by performing image processing including the processing contents corresponding to a predetermined mechanical conditions realized by the shooting operation, billing, characterized in that the re-correcting the image quality of the photographed image after correction by the first correction means Item 17. The image correction apparatus according to Item 16 . A step of causing a user to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types;
Corresponding to the shooting conditions corresponding to the predetermined shooting mode and the correction mode selected by the user for the shot image recorded and recorded in the predetermined shooting mode to which the shooting conditions corresponding to the specific subject type are applied And a correction process according to a difference condition corresponding to a difference from the image quality correction condition to be performed. On the computer,
A process for allowing the user to select a desired correction mode from among a plurality of correction modes respectively corresponding to a plurality of subject types;
Corresponding to the shooting conditions corresponding to the predetermined shooting mode and the correction mode selected by the user for the shot image recorded and recorded in the predetermined shooting mode to which the shooting conditions corresponding to the specific subject type are applied For executing a correction process according to a difference condition corresponding to a difference from the image quality correction condition to be performed. A step of causing a user to select a desired correction mode from a plurality of correction modes respectively corresponding to a plurality of subject types;
The image quality of a captured image captured and recorded in a shooting mode to which a shooting condition corresponding to a specific subject type is applied is determined from the shooting condition corresponding to the predetermined shooting mode when shooting the captured image. Correcting standard image quality corresponding to the case where standard shooting conditions excluding specific conditions are applied, and
And re-correcting the image quality of the captured image after correction to the standard image quality according to the image quality correction condition corresponding to the correction mode selected by the user. On the computer,
A process for allowing the user to select a desired correction mode from among a plurality of correction modes respectively corresponding to a plurality of subject types;
The image quality of a captured image captured and recorded in a shooting mode to which a shooting condition corresponding to a specific subject type is applied is determined from the shooting condition corresponding to the predetermined shooting mode when shooting the captured image. Processing to correct the standard image quality corresponding to the case where standard shooting conditions excluding the specific conditions are applied,
A program for executing a re-correction process for re-correcting the image quality of the captured image after correction to the standard image quality according to a predetermined image quality correction condition corresponding to the correction mode selected by the user.

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