KR100481489B1 - color control pattern generating device - Google Patents

Abstract

The present invention relates to a color adjustment pattern generating device in a color image display device.

The present invention provides a central processing unit for providing information on an image signal currently displayed by the color adjustment pattern generating unit to a color pattern generating unit and controlling the color pattern generating unit and the graphic processor, and receiving signal information from the central processing unit. A color pattern generator that calculates R, G, B values of the adjustment pattern of the preferred color to be received and displayed, and an R, G, B value input from the color pattern generator generates an adjustment pattern for the preferred color as an image. Characterized in that it comprises a graphics processor.

According to the present invention, in the color image display apparatus, a color pattern generator and a graphic processor produce and display a color pattern in reproducing skin color or seawater color from a signal source having various standards by using an internal color adjustment pattern generator. Use patterns to adjust the screen to your favorite color.

Description

Color control pattern generating device

The present invention relates to a color adjustment pattern generating device in a color image display device.

In more detail, the present invention relates to a device in which a color adjustment pattern generating device generates a color adjustment pattern for a preferred color and displays the color adjustment pattern on a screen so that the viewer can easily adjust the color to a preferred color.

In general, a color image display apparatus is a device that receives a color image signal transmitted from a transmitting apparatus and displays it on a screen by using a predetermined means.

In recent years, the color television is widely used as a home appliance that usually has one or more per household.

As described above, the principle of displaying an image in a color television that is widely used is as follows.

1 is a block diagram for displaying an image in a general color television.

The color television includes a tuner and a demodulator 100, an A / V switch 110, a 3D comb filter 120, an NTSC decoder 130, a video / sink processor a video / sync processer 140, an analog to digital converter (ADC) 150, a format converter 160, a color space converter (CSC) controller 170, and a graphics processor a processer 180, a digital to analog converter (DAC) unit 190, and an image output unit 191.

The tuner and demodulator 100 receives the RF signal transmitted from the broadcasting station through the antenna 100a, tunes and demodulates the TV signal, and separates the video signal and the audio signal.

The A / V switch unit 110 switches to select an external input signal or a TV signal.

In this case, the external input signal refers to a video signal received from the external video device by connecting various external video devices such as a PC, a DVD player, a VCR, and a camcorder.

The 3D comb filter unit 120 separates an image signal received from the tuner and the demodulator 100 or an external input into luminance and color signals (Y / C).

The NTSC decoder 130 converts the luminance and color signals Y / C received from the 3D comb filter unit 120 into luminance and color difference signals Y / U / V and outputs the converted luminance and color signals.

The color difference signals U and V mean two subcarrier modulation axes used in NTSC, and U and V are numerical values of the color difference signals R-Y and B-Y, respectively, and are used to modulate NTSC subcarriers.

The video / sink processing unit 140 bypasses the NTSC RF signal or the external input signal, which is an analog signal, and the Y, Pb, and Pr signals, which are digital signals, are Y, Cb, The Cr signal is converted into a Cr signal, and the R, G, and B signals, which are PC signals, are matrix converted into Y, Cb, and Cr signals.

The ADC unit 150 receives the luminance signals and the color difference signals of Y, Cb, and Cr from the video / sink processor 140 and converts them into digital signals.

The format converter 160 converts Y, U, and V signals into R, G, and B signals in the case of NTSC signals with respect to digital signals input from the ADC, and DTV signals, DVD signals, and PC signals The Y, Cb and Cr signals are converted into R, G and B signals.

The CSC controller 170 reproduces the color of the R, G, and B signals converted by the format converter 160 between the R, G, and B regions of each signal source and the R, G, and B regions of the display device. It corrects not only the color error that occurs in the area difference but also the color error that occurs in the signal gamma of each signal source, the difference between the reference white and the display gamma, and the reference white.

The graphic processor 180 receives the color error corrected signal from the CSC control unit and synthesizes the graphic signal generated by the graphic processor.

The DAC unit 190 receives a digital signal from the graphic processor, converts the digital signal into an analog signal, and outputs the converted signal to the image output unit 191.

Looking at the operation of the conventional color television having such a configuration in more detail as follows.

The tuned and demodulator 100 is tuned and detected, and the demodulated TV signal or the external input signal input from the external input terminal is separated into the luminance and color signals (Y / C) in the 3D comb filter unit 120 to the NTSC decoder unit At 130, the luminance and color difference signals (Y / U / V) are converted and output.

In the video / sink processor 140, matrix conversion of the D, Y, Pb, and Pr signals, the R, G, and B signals, and the PC signals is performed using the Y, Cb, and Cr signals. Bypass it.

As described above, the luminance signal and the color difference signal converted into Y, Cb, and Cr of the NTSC signal level are converted into a digital signal by the ADC unit 150, and the format converter 160 converts the R, G, and B signals into formats. .

Meanwhile, the CSC controller 170 converts the R, G, and B signals converted by the format converter 160 into a color reproduction region between the R, G, and B regions of each signal source and the R, G, and B regions of the display device. The color error caused by the difference and the signal gamma of each signal source, the color error caused by the difference between the reference white and the signal gamma and the reference white of the display device are corrected, and the color difference corrected signal is generated by the graphic processor 180. The synthesized graphic signal is converted into an analog signal through the DAC unit 190 and output to the image output unit 191.

In such a conventional color television system, the brightness of the image reproduced on the screen is proportional to the luminance of the original subject with a standard illumination, and the color is equal to the chromaticity coordinate of the original subject. Aim to reproduce.

However, for example, as the difference between the reference white of the camera corresponding to the transmitting side and the reference white of the display apparatus corresponding to the receiving side remains, the color reproduction distortion naturally occurs.

In addition, a TV signal source is mixed with a variety of signal sources having different standards, such as airwave broadcasting such as NTSC broadcasting or HDTV broadcasting, and DVD or digital camera.

As described above, a TV signal source having various standards and a video signal from each signal source are subjected to gamma processing in consideration of the characteristic gamma of the CRT, which is an image display apparatus.

Therefore, when color reproduction is performed on the receiving side without considering the gamma as described above, distortion occurs during color reproduction.

In addition, a chromatic error occurs when the phosphor coordinates of the transmitter-side standard monitor and the phosphor coordinates of the receiver-side are shifted.

In other words, when receiving and displaying image signals from signal sources having various standards, if they are reproduced without considering the reference white, gamma value, and phosphor coordinates of each signal source, problems such as distortion or chromaticity error occur during color reproduction. This will occur.

An object of the present invention is to input R, G, B values from x, y, Y coordinates using reference white, standard gamma, and standard phosphor coordinates of a signal source in a pattern generator and a graphic processor in a color image display apparatus. According to the present invention, there is provided a color adjustment pattern generating device capable of efficiently performing color adjustment by generating an optimized adjustment pattern and displaying the result on a screen.

In addition, another object of the present invention is to enable the viewer to adjust to the preferred color according to their preferences, the designer can adjust the screen to the viewer's favorite favorite color to enable color adjustment without a separate signal generator In addition, the present invention provides a color adjustment pattern device that calculates a dark color of the same phase with respect to the preferred color when the preferred color is displayed.

In order to achieve the above object, the present invention provides a color adjustment pattern generating apparatus, comprising: a central processing unit which provides information on an image signal currently being displayed to a color pattern generator and controls the color pattern generator and the graphics processor; A color pattern generator which receives the signal information from the central processing unit and calculates R, G, B values of the adjustment pattern of the preferred color to be displayed; and a preferred color by the R, G, B values input from the color pattern generator Characterized in that it comprises a graphics processor for producing an adjustment pattern for the image.

In addition, the color pattern generator is characterized by calculating the R, G, B value of the preferred color using a gamma value or a standard phosphor or reference white as a standard in each signal source.

In addition, the preferred color displayed in the adjustment pattern and the color density of the same phase is characterized in that the display together.

In addition, when the adjustment pattern is displayed on the screen of the color image display device, the adjustment pattern is captured by a standard camera, and then a fine phase adjustment is performed by inputting a signal to a vector scope connected to the color image display device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating signal processing in a color television according to an exemplary embodiment of the present invention. Detailed descriptions of the same parts as those of FIG. 1 described with reference to FIG. 2 will be omitted and briefly described.

In the color image display apparatus, the color adjustment pattern generating apparatus includes a central processing unit 200 which provides information about a signal currently being displayed to the color pattern generating unit and controls the color pattern generating unit and the graphics processor, and the central processing unit. Color pattern generator 210 for calculating the R, G, B value of the preferred color to be displayed using the information received from the (200) and the adjustment for the preferred color with the signal received from the color pattern generator 210 And a graphics processor 220 for producing a pattern.

In the central processing unit 200, if the currently displayed signal is an NTSC signal, the color pattern generator 210 provides the R, G, B coordinates and gamma values of the phosphors, which are the standard for NTSC signals, and the coordinate information of the C light, which is the reference white. to provide.

The color pattern generator 210 receives the information of the NTSC signal currently displayed from the central processing unit 200 to be displayed using the standard phosphor coordinates of the signal source, the standard gamma value, and the coordinate information of the C light of reference white color. R, G, B values are calculated from the x, y, Y coordinates of the preferred color.

The graphic processor 220 receives the R, G, and B signals calculated and output by the color pattern generator 210 and displays the adjustment pattern for the preferred color on the image output device.

On the other hand, gamma defines the brightness and contrast of the display. In the case of a CRT (Cathode Ray Tube), which is widely used in color image display devices, the brightness of the display is proportional to about 2.2 times the magnitude of the input signal. The gamma value is different for each signal source, so it is necessary to adjust it so that the difference in brightness between the dark and the bright part of the screen can be recognized uniformly. Reproducibility can be tailored.

In addition, the preferred color means a subjective favorite color according to the preference of the general viewer. For example, among the human skin colors, whites like sun tanned skin color and Koreans like newborn skin. I prefer a slightly reddish white skin like this.

For another example, general viewers prefer darker greens to leaves than actual colors, while sky and seawater colors prefer darker colors than actual colors.

Therefore, in order to adjust the screen color to the preferred color suitable for the viewer's preference as described above, the adjustment pattern is displayed on the screen by using the color pattern generator 210 and the graphic processor 220 which are the color pattern generator described above. .

3 is a schematic NTSC system diagram for adjusting a preferred color as an embodiment according to the present invention.

The NTSC system includes a TV 320 for displaying an adjustment pattern, and an NTSC standard camera 310 for capturing an adjustment pattern displayed on the TV 320 by adjusting a white balance to C light, which is a reference white color. And a vector scope 330 and a PC for inputting an output signal of the NTSC standard camera 310 to adjust a color space converter (CSC), color density, tint, contrast, and the like. 300).

The white balance adjustment mentioned above means adjusting to the characteristics of the light beams in order to reproduce the correct color on the screen.

 Humans have the flexibility to feel white under different rays of light as the nerves move, so that white paper can be felt the same white under indoor lighting or under the outdoor sun.

However, a machine such as a color image display device must be adjusted for each signal source to reproduce accurate colors.

 The more colors are added, the brighter it becomes and eventually becomes white. At this time, if white color is accurately represented as white, the remaining colors are naturally expressed in their own color, which is important in adjusting the color of the screen. Element.

The NTSC standard camera 310, which has a white balance adjustment to C light, which is the reference white of the NTSC system, photographs a color adjustment pattern displayed on the TV 320 and inputs an output signal to the vector scope 330.

The vector scope demodulates the color signal components of the input video signal and then adjusts the desired color to the desired position on the vector scope.

In particular, in the case of the human skin color among the preferred colors, since the color density is not dark, it is positioned around the center on the vector scope.

As described above, when the center is located around the center, it is very difficult to adjust the fine phase of the color. Therefore, when displaying the preferred color, the color fine phase adjustment is further calculated by calculating the same dark color of the same phase corresponding to the preferred color and displaying it simultaneously. Make it easy.

4 is an embodiment of a color adjustment pattern according to the present invention.

The adjustment pattern is white, yellow, cyan, skin color, I-axis, -I-axis, green, magenta, red (from left) as shown in the figure. It consists of red and blue.

Looking at the pattern of skin color in the adjustment pattern, the indication '1' is the skin color of the flash tone of the white woman originally and the indication '4' is the skin color corresponding to the cheek of the Japanese woman.

As mentioned above, in the case of human skin color, since the color density is not dark, it is located around the center on the vector scope, and thus, fine phase adjustment is difficult, so that accurate positioning can be difficult and error occurrence can be increased during color reproduction adjustment.

Accordingly, the color depths of the same phase are displayed in a dark color together, and the display '2' and the display '3' are the color of the same phase of the display '1' and the display '4', respectively.

As described above, in the case of skin color, the original skin colors of the display '1' and the display '4' are located near the center on the vector scope, so that the color 'high' in the same phase and the display '2' By adjusting the color, the error in the fine phase adjustment can be adjusted less.

The present invention enables the viewer to adjust the screen to a favorite color by using the internal color adjustment pattern generator in the color image display device to reproduce the viewer's favorite screen color to the color image display device purchased by the viewer It is effective to increase satisfaction.

In addition, the apparatus for generating a color adjustment pattern according to the present invention calculates and displays not only the pattern for the preferred color being displayed but also the color having the same color as the preferred color with the same color as the preferred color, so that the viewer or designer finely phases the preferred color. There is an effect to make it easier to make adjustments.

1 is a block diagram for displaying an image in a general color television.

2 is a partial block diagram of signal processing in a color television as an embodiment according to the present invention;

3 is a schematic NTSC system diagram for preferred color adjustment as an embodiment in accordance with the present invention;

4 is one embodiment of a color adjustment pattern in accordance with the present invention;

<Description of Signs of Major Parts of Drawings>

100a: antenna 100: tuner and demodulator

110: A / V switch unit 120: 3D comb filter

130: NTSC decoder 140: video / sink processing unit

150: ADC unit 160: format converter unit

170: CSC control unit 180: graphics processor

190: DAC unit 191: video output unit

200: central processing unit 210: color pattern generating unit

220: graphics processor 300: PC

310: NTSC standard camera 320: TV

330: Vectorscope

Claims (4)

A central processing unit for providing information on an image signal currently being displayed to a color pattern generator and controlling the color pattern generator and the graphics processor; A color pattern generator which receives signal information from the central processing unit and calculates R, G, and B values of an adjustment pattern of a preferred color to be displayed; And a graphic processor configured to produce an adjustment pattern for a preferred color as an image using the R, G, and B values input from the color pattern generator. The method of claim 1, And the color pattern generator calculates R, G, and B values of a preferred color by using a gamma value, a standard phosphor, or a reference white as a standard in each signal source. The method of claim 1, And a color having a color depth of the same phase and a preferred color displayed in the adjustment pattern together. The method of claim 1, When the adjustment pattern is displayed on the screen of the color image display device, the image adjustment pattern is captured by a standard camera, and then a fine phase adjustment is performed by inputting a signal to a vector scope connected to the color image display device. Generating device.