KR19980073496A - Image quality correction device and method using CHROMA EYE - Google Patents

Abstract

The present invention relates to a device for automatically correcting an image display device using a chroma eye (CHROMA EYE) and a method for correcting the same by automatically correcting the image data according to an ambient light environment of the image display device. As an example, the image quality compensation system detects the state and the amount of change of the ambient light using a chroma eye and provides an optimal screen state from the perspective of a user watching TV.

In the conventional automatic image correcting apparatus, the image data and the W / B are reset with respect to the change in the ambient illumination light. However, since the image data is determined to be a low SUM value, the deviation may be caused by the output difference value of the sensor module. In the W / B setting, the sensitivity of the module is low, so it is difficult to judge the illumination light for the low illumination main surface light. In addition, in the case of using the existing W / B setting criteria, the same W / B is set in the case of R + G + B 46 in the high light conditions, it is impossible to set the W / B according to the lighting.

In order to solve the above-mentioned problems, the present invention provides a method of detecting a color component of an ambient light state using a chroma eye and a user who views a TV and an ambient light state instead of setting a W / B of an image display device by an existing ambient light. We present the W / B setting method according to the color adaptation form.

Description

Image quality correction device and method using CHROMA EYE

The present invention relates to a device for automatically correcting an image display device using a chroma eye (CHROMA EYE) and a method for correcting the same by automatically correcting the image data according to an ambient light environment of the image display device. As an example, the image quality compensation system detects the state and the amount of change of the ambient light using a chroma eye and provides an optimal screen state from the perspective of a user watching TV.

Conventional image correction apparatus performs image automatic correction operation by using three values of R, G, B sensor or R, G, B output from an external lighting state.

At this time, the brightness of the ambient light and the conditions of the illumination light are determined by three output values of R, G, and B during the operation of the automatic image compensator, and the operating method of the automatic image compensator is the input of the input R, G, B. The value is automatically corrected according to the surrounding conditions by changing the image data of the W / B, brightness, color density, sharpness and contrast of the image display device according to the stored output table value.

FIG. 1 is a conventional color sensing processor which performs color sensing in the Cy and Ye color sensing units 101 and 102, and adjusts the detection signal offset value in the output adjusting unit 103 and 104 to increase the amplification unit. The sensed signal amplified at 105 and 106 is output to the output unit 107. At this time, the feedback circuit 108 negatively feedbacks the Cy and Ye output values to the input stage to obtain R and B values.

2 is a conventional automatic image correcting apparatus using a Cy, Ye sensor module consisting of a Cy, Ye sensor 201, an amplifier 202, 203, a low pass filter 204, 205, a correction circuit 206 When the output of the color detecting unit is converted into digital data through the A / D converter 207 and input to the microcomputer 208, the microcomputer determines the surrounding environment with the detected color data and is suitable for the image signal processing unit 209. Image correction is performed by passing the image signal processing value.

In the figure, 210 is a monitor, 211 is a tuner, 212 is a detector, 213 is a voice signal processor, and 214 is a speaker.

Table 1 shows the setting criteria of the W / B processed by the microcomputer 208 of FIG. 2, wherein the setting criteria of the W / B are R values and B values using three input values of R, G, and B. W / B setting is made by the difference of. For example, if R is 10 and B is 8, W / B is set to 1100 ° K.

Table 2 is an image data setting reference table according to illumination determined by the microcomputer 208. The setting of the image reference is determined by the sum of input R, G and B, and the maximum sum (SUM) value of the table is 46.

FIG. 3 is a data processing procedure in the microcomputer 208. The sum value is obtained by adding input values, and the image data is changed by the sum value, and the difference between the R and B values is used. Adjust B.

The operation of the conventional automatic image compensator as described above resets the image data and W / B with respect to the change of the ambient light, but the image data is judged to be a low SUM value, so the deviation occurs due to the output difference value of the sensor module. This is possible. In the W / B setting, the sensitivity of the module is low, so it is difficult to judge the illumination light for the low illumination main surface light.

In addition, in the case of using the existing W / B setting criteria, the same W / B is set in the case of R + G + B 46 in the high light conditions, it is impossible to set the W / B according to the lighting.

In order to solve the above-mentioned problems, the present invention provides a method of detecting a color component of an ambient light state using a chroma eye and a user who views a TV and an ambient light state instead of setting a W / B of an image display device by an existing ambient light. We present the W / B setting method according to the color adaptation form.

1 is a circuit diagram of a color sensing processing unit applied to a conventional automatic image correcting apparatus.

2 is a block diagram of an automatic image correcting apparatus using a conventional color detection processor

3 is a flowchart illustrating an operation process of a conventional automatic image correcting apparatus.

4 is a circuit diagram of a chroma eye applied to the present invention.

5 is a block diagram of an automatic image correcting apparatus of the present invention.

6 is a flowchart of the automatic image correction process of the present invention

Table 1 is a reference table for setting color temperature for conventional automatic image correction

Table 2 is a table of image data setting for conventional automatic image correction

Table 3 is a color temperature setting reference table for the automatic image correction of the present invention

Table 4 is a reference table for setting image data for automatic image correction according to the present invention.

Figure 4 is a detailed view of the chroma eye applied to the present invention, using the Cy, Ye sensor to detect the cyan (Cy) and yellow (Ye) color components of the surrounding light components, the detected Cy, Ye color components are R ', It is a value of B 'and is output in separate doors with red and blue components, respectively.

Here, R 'and B' are the color signal components processed by the output characteristics of the chroma eye, not the actual R and B components of the actual ambient light, and are respectively applied to the input and output for uniform output characteristics in the optical state. With an offset voltage correction device, a second amplifier stage was added to increase the output value.

That is, as shown in Figure 6, the Cy color sensing unit 601 and Ye color sensing unit 602 detects the color signal components around the device, and input voltage adjustment for the offset current, voltage of the operational amplifier (603) (604).

In addition, the output offset adjustment unit 605 or 606 adjusts the input voltage adjustment with respect to the output offset current and voltage of the operational amplifier.

The amplifiers 607 and 608 amplify the sensed color signal values to a sufficient level, and the sense signal output ratio adjusting unit 609 controls the ratio of the output components R 'and B' of the chroma eye at the input values of Ye and Cy. Adjust

In addition, the output amplifiers 610 and 611 amplify and output the color detection signal that is finally output.

5 is a block diagram of an image quality compensation device using a chroma eye of the present invention, in which a Cy, Ye sensor 701, an amplifier 701, a low pass filter 703, 704, an output amplifier 705, and an input / output offset adjustment are shown. The chroma eye 700 of FIG. 4 including a part 706, an A / D converter 707 for converting the color detection signal output from the chroma eye 700 into digital data, and the A / D A microcomputer 708 that receives the converted digital color detection signal and determines the lighting environment around the device as a sum (SUM) and a ratio (R / B) and outputs image quality compensation control data according to the determination result; The image signal processor 709 receives the image quality compensation data output from the display 708 and displays and outputs the image signal with the image quality compensated, wherein 710 is a monitor, 711 is a tuner, 712 is a detector, and 712 is a voice signal processor. .

Looking at the operation, the R ', B' value output from the chroma eye 700 is digitally converted by the A / D converter 707 and converted into R, B data that can be used by the microcomputer, and the digitally converted R, B From the value, the microcomputer 708 generates a G value necessary for setting image data by a calculation formula.

With the R, G and B values, the microcomputer determines the image data (contrast, brightness, color density, and sharpness) for the external lighting environment, and finds the appropriate W / B for the current lighting from the R and B values.

In addition, the data of the tint (TINT), the axis, and the sub color (Sub_Color) are changed from the R and B values to compensate for an appropriate picture quality.

Table 3 shows W / B setting criteria and adjustment data setting criteria of the image quality correction device and method using CHROMA EYE.

The determination of the illumination light is determined by the ratio (R / B) of the R and B values input to the microcomputer.

In the conventional W / B setting criteria shown in Table 1, the illumination light is judged by the difference of the input R 꽈 B, so in the case of No. 3, W / B is set from (4 ≧ R-B> 1) → 1100 ° K.

However, if the lighting is strong, the R and B values increase as a whole, so that they may be out of the initial setting conditions, and in the case of R + G + B≥46, it exceeds the setting standard of 1300。K and W / B setting is not possible.

However, according to the W / B setting criterion to which the chroma eye 700 is applied, since the ratio of the output value (R / B) is used even when the illuminance of the light source increases, the correct W / B for the high illuminance light source is used as in the low illuminance. Can be maintained.

When the illuminance of the light increases, the value of both R and B for the light increases, so the lighting condition of the light source can be determined because the ratio is kept constant.

Also, by changing the X-axis and TINT simultaneously according to the W / B change caused by the lighting condition, the color reproduction error due to the W / B change is improved.

The setting range of W / B for each lighting is based on experimental and theoretical grounds.

Experimental evidence shows that indoor lighting has a color temperature of about 6500ºK for fluorescents and 4000ºK for incandescents.

According to the theoretical basis, the W / B of the image display window for the illumination condition is the color temperature of 3000 ° K to 4000 ° K plus the color temperature of the illumination light.

In addition to the W / B setting based on the ambient light, the W / B and adjustment data are changed in accordance with the color adaptation speed of the viewer from the perspective of the TV viewer.

The image data (contrast, brightness, color density, sharpness) is changed according to the brightness of the illumination to provide an appropriate image to the user, and the image adjustment data is a value set based on skin color correction.

Table 4 is an image setting criterion of the image quality compensation system using the chroma eye, and the value of the image setting criterion is increased as a whole by improving the characteristics of the chroma eye 700.

In order to improve the output error due to the initial dark state offset voltage, it can be seen that the range of SUM is wider than the initial value set in Table 2.

6 is a flowchart of the image quality compensation method using the chroma eye of the present invention.

After generating a G value from the A / D conversion value 707 of the chroma eye 700 input to the microcomputer 708, the G data is generated from the SUM = R + G + B and gamma (Gamma). Set the value.

After resetting the values of W / B, TINT, X-axis, and sub-color by the ratio of B / R, the set values are inputted to the image signal processor 709 to receive data. Is transmitted to the video signal processor 709.

In addition, the image signal processor 709 changes the image signal appropriately from the input control value with respect to the image signal input through the tuner 711 and the detector 712 to the image quality displayed on the monitor 710. Get rewarded.

The present invention uses two outputs (R, B), compared to the three outputs (R, G, B) from the sensor module using a conventional Cy, Ye sensor.

Therefore, the number of ports on the input side can be reduced from three to two.

In addition, it is possible to adjust the offset voltage of the input as well as the existing output offset adjustment to reduce the occurrence of deviation due to the offset.

The method of setting color temperature (W / B) by the ratio of chroma eye output values and the system configuration based on the adjustment data not only set the ambient light that the automatic image correction device can have, but also corrects the effect by the user's color adaptation. Have

In addition, the user can feel the improved image quality when the user watches TV by the color adaptation correction method, and the use of the chroma eye enables the determination of the light state characteristics at low to high illuminance.

Claims (2)

CHROMA EYE for detecting R and B colors from Cy and Ye around the device as ambient light environment, A / D conversion means for converting the color signal detected by the chroma eye into digital data, and the A / D A microcomputer for performing image quality compensation by performing image data and gamma setting using the sum and ratio of digital color sensing information converted by the converting unit, and image signal processing unit for correcting and outputting image data under the control of the microcomputer. Image quality correction device using CHROMA EYE, characterized in that consisting of. Detecting R and B color signal values of an ambient light environment from Cy and Ye around the device and generating a G value, setting image data and gamma data from the sum of the detected color signal values, and detecting the detected color signals And determining the ambient light of the device from the ratio of the values, and setting the image data, and displaying the image signal corrected with the set data.