CN101677407A - Color adjustment method for display device and related device thereof - Google Patents

Abstract

A color adjustment method for a display device and a related device thereof. The method for adjusting color comprises receiving a video mixing signal, wherein the video mixing signal comprises a first chroma signal and a first brightness signal; generating a hue signal and a saturation signal at least according to the first chroma signal; respectively generating a brightness gain parameter, a saturation gain parameter and a hue deviation parameter according to the hue signal and the saturation signal; adjusting the first brightness signal according to the brightness gain parameter to generate a second brightness signal; and adjusting the first chroma signal according to a mixing parameter and the hue shift parameter to generate a second chroma signal. The brightness gain parameter is generated through noise suppression processing, and the video mixed signal is prevented from being interfered by noise at low saturation.

Description

Color adjustment method used in a display device and related device

technical field

The present invention relates to a method for adjusting color in a display device and related devices, in particular to a method for adjusting the hue (Hue), saturation (Saturation) and intensity (Intensity) of a video mixed signal, and then adjusting The video mixing signal method and its related device.

Background technique

With the advancement of communication and display technology, people can watch their favorite movies and TV programs through image playback devices such as televisions or computers. At the same time, the requirements for picture quality are getting higher and higher. Therefore, the color adjustment technology for the display is also developing towards the direction of easy operation and accurate color adjustment.

The human eye can distinguish the three primary colors of red, green, and blue light, and the display only needs to output the red, blue, and green three-color signals of one screen, that is, the image signal R/G/B, to obtain a picture quality close to the real one. In addition to the image signal R/G/B, the image signal Y/I/Q or Y/U/V commonly used in the color TV broadcasting system, the image signal C/M/Y/K used in the printing industry, and the image signal used by the digital signal Y/Cb/Cr, etc., are common color space (Color Space) formats. In order to save bandwidth and meet compatibility, the known color TV broadcasting system does not directly transmit the three-color image signal R/G/B of the image frame, but transmits a composite signal. The so-called "mixing" refers to sending the luminance (Luminance) signal and the chroma (Chrominance) signal mixed together to be compatible with black and white and color TV systems and to save bandwidth. For example, in the image signal Y/Cb/Cr, Y is a luminance signal, and Cb/Cr is a chroma signal.

Please refer to FIG. 1 , which is a schematic diagram of a color space. In Figure 1, the color space is marked with six axes of red/green/blue/cyan/magenta/yellow. A known six-axis color adjustment technology is to determine which area the color falls in according to the size relationship of the image signal R/G/B in the color to be adjusted, and then adjust them respectively. The six-axis color correction technology can be used for precise color correction, but it is less intuitive and difficult for users to operate.

Another known color adjustment technology is to establish a two-dimensional look-up table (Look-up Table) to store the corresponding gain of each chroma signal, and adjust the chroma of each color accordingly. However, the above-mentioned toning technology can only independently adjust the hue (Hue) and saturation (Saturation) of the color, but cannot adjust the intensity (Intensity) of the color. Therefore, if the above-mentioned color adjustment technology is applied to a display, the user cannot independently adjust the contrast of the displayed image.

Contents of the invention

Therefore, the main objective of the present invention is to provide a method for adjusting color in a display device and related devices.

The invention discloses a method for adjusting color in a display device, which includes receiving a video mixed signal, and the video mixed signal includes a first chroma signal and a first luminance signal; at least according to the first chroma signal , generate a hue signal and a saturation signal; generate an intensity gain parameter according to the hue signal and the saturation signal; generate a saturation gain parameter according to the hue signal; generate a hue offset parameter according to the hue signal ; adjust the first luminance signal according to the intensity gain parameter to generate a second luminance signal; and adjust the first chroma signal according to a mixing parameter and the hue shift parameter to generate a first chroma signal Two chroma signals, wherein the mixing parameter is generated according to the saturation gain parameter.

The present invention also discloses a color adjustment device used in a display device, which includes a receiving end, a signal generating unit, an intensity corresponding unit, a saturation corresponding unit, a color corresponding unit, a brightness signal processing unit and a Chroma signal processing unit. The receiving end is used for receiving a mixed video signal, and the mixed video signal includes a first chroma signal and a first luminance signal. The signal generating unit is coupled to the receiving end and used for generating a hue signal and a saturation signal at least according to the first chroma signal. The intensity corresponding unit is coupled to the signal generating unit, and is used for generating an intensity gain parameter according to the hue signal and the saturation signal. The saturation corresponding unit is coupled to the signal generating unit, and is used for generating a saturation gain parameter according to the hue signal. The hue corresponding unit is coupled to the signal generating unit, and is used for generating a hue shift parameter according to the hue signal. The luminance signal processing unit is coupled to the receiving end and the intensity corresponding unit, and is used for adjusting the first luminance signal according to the intensity gain parameter to generate a second luminance signal. The chroma signal processing unit is coupled to the receiving end, the saturation corresponding unit, and the hue corresponding unit, and is used to adjust the first chroma signal according to a mixing parameter and the hue shift parameter to generate a The second chroma signal, wherein the mixing parameter is generated according to the saturation gain parameter.

Description of drawings

FIG. 1 is a schematic diagram of a color space.

2 and 9 are schematic diagrams of a color adjustment device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a saturation signal versus a gain signal in FIG. 2 .

FIG. 4 is a schematic diagram of an initial intensity corresponding unit, a saturation corresponding unit and a hue corresponding unit in FIG. 2 .

FIG. 5 is a schematic diagram of a color relative intensity lookup table according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a hue lookup table for a hue pair according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a color-relative-saturation lookup table according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of a variant embodiment of the chroma signal processing unit in FIG. 2 .

FIG. 10 is a schematic diagram of a process in Embodiment 1 of the present invention.

[Description of main component symbols]

20, 30 Color adjustment device

200 Receiver

202 Signal generating unit

204 Strength corresponding unit

206 Saturation corresponding unit

208 Hue corresponding unit

210 Luminance signal processing unit

212, 218 Chroma signal processing unit

214 Hue adjustment unit

216, 224, 300 multipliers

220 Initial Strength Corresponding Unit

222 noise suppression unit

230, 232, 234 Interpolation operation unit

LUT1, LUT2, LUT3 lookup tables

C1, C2 Chroma signal

Y1, Y2 Brightness signal

H Hue signal

S Saturation signal

Wg Gain signal

Ca, Cm output signal

Ii Initial Intensity Gain Parameters

Ia Intensity Gain Parameters

Sa Saturation gain parameter

Ha Hue Shift Parameters

M Mixing parameters

40 Process

400, 402, 404, 406, 408, 410, 412, 414, 416, 418 steps

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of a color adjustment device 20 according to an embodiment of the present invention. The color adjustment device 20 is used in a display device to adjust the color settings of the display device. Please note here that since the color signal of the H/S/I format is more intuitive to the human eye than the Y/Cb/Cr or R/G/B format, the embodiments of the present invention separately analyze the H/S/I color signal of the color signal. S/I adjustments are made for optimum color settings.

The color adjustment device 20 includes a receiving end 200 , a signal generating unit 202 , an intensity corresponding unit 204 , a saturation corresponding unit 206 , a color corresponding unit 208 , a brightness signal processing unit 210 and a chroma signal processing unit 212 . The receiving end 200 is used for receiving a mixed video signal, which includes a chroma signal C1 and a luminance signal Y1. The video mix signal can have different formats, such as Y/Cb/Cr or Y/U/V. The signal generating unit 202 is coupled to the receiving end 200 and used for generating a hue signal H and a saturation signal S according to the chroma signal C1. Taking the mixed video signal in Y/Cb/Cr format as an example, the chroma signal C1 includes color difference signals Cb and Cr. The hue signal H is an angle within the range of 0 to 360 degrees, representing each color, and the saturation signal S represents the depth of the color, which can be calculated by the following equation:

H=arctan(Cb/Cr)

S=sqrt(Cr*Cr+Cb*Cb)

In addition, the hue signal H and the saturation signal S can also be calculated by mixing the chroma signal C1 and the brightness signal Y1 . For example, the signal generating unit 202 first converts the chroma signal C1 and the brightness signal Y1 into signals in R/G/B format, and then converts them to generate a hue signal H and a saturation signal S.

The intensity corresponding unit 204, the saturation corresponding unit 206 and the hue corresponding unit 208 are all coupled to the signal generating unit 202, and are used to generate an intensity gain parameter Ia and a saturation gain parameter Sa respectively according to the hue signal H and the saturation signal S and a hue shift parameter Ha for adjusting the intensity, saturation and hue of the chroma signal C1. The intensity gain parameter Ia represents the intensity gain that must be adjusted for the chroma signal C1; the saturation gain parameter Sa represents the saturation gain that must be adjusted for the chroma signal C1; the hue offset parameter Ha is an offset angle, indicating that the hue signal H must The angle to be corrected.

When the saturation of the mixed video signal received by the display device is low, the strength of the mixed video signal is easily affected by noise. It should be noted that the intensity gain parameter Ia generated by the intensity corresponding unit 204 is a noise-suppressed signal. It can be seen from FIG. 2 that the intensity corresponding unit 204 is different from the saturation corresponding unit 206 or the hue corresponding unit 208 , and includes an initial intensity corresponding unit 220 , a noise suppression unit 222 and a multiplier 224 . The initial intensity corresponding unit 220 is coupled to the signal generating unit 202 for generating an initial intensity gain parameter Ii according to the hue signal H. The noise suppression unit 222 is used for generating a gain signal Wg according to the saturation signal S. The multiplier 224 is coupled to the initial intensity corresponding unit 220 and the noise suppression unit 222, and is used for performing noise suppression processing on the initial intensity gain parameter Ii according to the gain signal Wg, so as to generate the intensity gain parameter Ia.

Please refer to FIG. 3 for the relationship between the saturation signal S and the gain signal Wg. It can be seen from FIG. 3 that when the saturation signal S is smaller than a threshold Sth, the gain signal Wg can compensate the initial intensity gain parameter Ii to resist noise interference. When the saturation signal S is greater than the threshold value Sth, the strength of the mixed video signal is sufficient to resist noise interference, so the gain signal Wg stops increasing. It is worth noting that the intensity corresponding unit 204 is an embodiment of the present invention, and any unit that can generate the gain signal Wg according to the saturation signal S and adjust the initial intensity gain parameter Ii according to the gain signal Wg should be included in the present invention. within the scope of protection.

In addition, the initial intensity corresponding unit 220 , the saturation corresponding unit 206 and the hue corresponding unit 208 use the same method to generate parameters respectively. Please refer to FIG. 4 , which is a schematic diagram of the initial intensity corresponding unit 220 , the saturation corresponding unit 206 and the hue corresponding unit 208 in FIG. 2 . The initial intensity corresponding unit 220 includes a look-up table LUT1 and an interpolation operation unit 230 . The look-up table LUT1 is used to store a plurality of intensity gain parameters, and the interpolation unit 230 is used to interpolate the hue signal H according to the plurality of intensity gain parameters to generate an initial intensity gain parameter Ii. Similarly, the saturation corresponding unit 206 includes a look-up table LUT2 (storing a plurality of saturation gain parameters) and an interpolation operation unit 232; the hue corresponding unit 208 includes a look-up table LUT3 (storing a plurality of hue shift parameters) and a Interpolation operation unit 234 . The operation modes of the saturation corresponding unit 206 and the hue corresponding unit 208 are the same as those of the initial intensity corresponding unit 220 , and will not be repeated here. If the number of parameters stored in each lookup table is sufficient, the display device may directly select the corresponding parameter without performing interpolation.

For the embodiments of the look-up tables LUT1 , LUT2 and LUT3 , please refer to FIG. 5 to FIG. 7 . 5 to 7 are sequentially schematic diagrams of a Hue-Intensity lookup table, a Hue-Saturation lookup table, and a Hue-Hue lookup table according to an embodiment of the present invention. Taking Figure 5 as an example, assuming that the maximum value of the intensity gain parameter is 200%, and the minimum value is 0%, when the hue signal H represents blue (point A in the figure), the initial intensity gain parameter Ii is about 125%; when When the hue signal H is far from blue, the gain becomes 100%, that is, does not change.

After the intensity gain parameter Ia, saturation gain parameter Sa and hue shift parameter Ha are generated, the display device can be used to adjust the intensity, saturation and hue of the brightness signal Y1 and chroma signal C1. The luminance signal processing unit 210 is coupled to the receiving end 200 and the intensity corresponding unit 204, and is used for adjusting the luminance signal Y1 according to the intensity gain parameter Ia to generate a luminance signal Y2. In FIG. 2, the luminance signal processing unit 210 is implemented by a multiplier. In other embodiments of the present invention, the luminance signal processing unit 210 may be other devices for adjusting the luminance signal Y1 according to the intensity gain parameter Ia. In addition, the chroma signal processing unit 212 adjusts the chroma signal C1 according to a mixing parameter M and a hue shift parameter Ha to generate a chroma signal C2. In FIG. 2 , the saturation signal processing unit 212 includes a hue adjustment unit 214 and a multiplier 216 . The hue adjusting unit 214 is coupled to the receiving end 200 and the hue corresponding unit 208 for multiplying the chroma signal C1 and the rotation matrix formed by the hue shift parameter Ha to generate an output signal Ca. The multiplier 216 is coupled to the hue adjustment unit 214 and the saturation corresponding unit 206 for multiplying the output signal Ca by the mixing parameter M to generate the saturation signal C2.

It should be noted that even if the coupling relationship between the hue adjusting unit 214 and the multiplier 216 and other units is changed, the chroma signal C2 can still be generated. Please refer to FIG. 8 , which is a schematic diagram of a chroma signal processing unit 218 according to an embodiment of the present invention. In the chroma signal processing unit 218 , the multiplier 216 is coupled to the receiving end 200 and the saturation corresponding unit 206 , and the hue adjustment unit 214 is coupled to the multiplier 216 and the hue corresponding unit 208 . The multiplier 216 multiplies the chroma signal C1 by the mixing parameter M to generate an output signal Cm, and then the hue adjustment unit 214 multiplies the output signal Cm by the rotation matrix formed by the hue shift parameter Ha to generate the chroma signal C2 .

In Fig. 2, the mixing parameter M is equivalent to the saturation gain parameter Sa. In other words, the chroma signal C1 can be adjusted according to the intensity gain parameter Ia in addition to being adjusted according to the saturation gain parameter Sa. Please refer to FIG. 9 , which is a schematic diagram of a color adjustment device 30 according to an embodiment of the present invention. The components and operation of the color adjustment device 30 are similar to the color adjustment device 20 in FIG. 2 , the difference is that the color adjustment device 30 includes a multiplier 300 more than the color adjustment device 20 . In FIG. 9, the multiplier 300 is coupled to the intensity corresponding unit 204, the saturation corresponding unit 206 and the chroma signal processing unit 212, and is used to multiply the saturation gain parameter Sa and the intensity gain parameter Ia to generate the mixing parameter M to the chroma signal processing unit 212. In this way, the chroma signal C1 can be adjusted according to the intensity gain parameter Ia in addition to being adjusted according to the saturation gain parameter Sa.

It can be seen from the above that the display device can receive the chroma signal C1 and the luminance signal Y1 through the color adjustment device of the embodiment of the present invention, generate the hue signal H and the saturation signal S according to the chroma signal C1, and adjust the chroma signal accordingly Hue, saturation and intensity of C1, and then generate chroma signal C2 and brightness signal Y2. At the same time, the color adjustment device adjusts the brightness signal Y1 according to the gain signal Wg generated by the saturation signal S, thus effectively reducing noise interference to the low-saturation video mixed signal. Please note here that the main purpose of the embodiment of the present invention is to adjust the color by separately adjusting the hue, saturation, and intensity of the chroma signal C1. Other color space formats such as H/S/L or H/S/V signals can be applied in the embodiments of the present invention.

In addition, the operation of the color adjustment device 30 in FIG. 9 can be implemented according to a process 40 . Please refer to FIG. 10 , which is a schematic diagram of a process 40 according to an embodiment of the present invention. Process 40 includes the following steps:

Step 400: start.

Step 402: The receiver 200 receives the mixed video signal, which includes the chroma signal C1 and the luminance signal Y1.

Step 404: The signal generation unit 202 generates a hue signal H and a saturation signal S according to the chroma signal C1.

Step 406: The initial intensity corresponding unit 220, the saturation corresponding unit 206, and the hue corresponding unit 208 respectively generate an initial intensity gain parameter Ii, a saturation gain parameter Sa, and a hue shift parameter Ha according to the hue signal H.

Step 408: The noise suppression unit 222 generates a gain signal Wg according to the saturation signal S.

Step 410: The multiplier 224 performs noise suppression processing on the initial intensity gain parameter Ii according to the gain signal Wg, so as to generate the intensity gain parameter Ia.

Step 412: The luminance signal processing unit 210 adjusts the luminance signal Y1 according to the intensity gain parameter Ia to generate a luminance signal Y2.

Step 414: The multiplier 300 generates a mixing parameter M according to the saturation gain parameter Sa and the intensity gain parameter Ia.

Step 416: The saturation signal processing unit 210 adjusts the saturation signal C1 according to the mixing parameter M and the hue shift parameter Ha to generate a saturation signal C2.

Step 418: Output the saturation signal C2 and the brightness signal Y2.

As for the operation and variant embodiments of each step in the process 40 , refer to the aforementioned color adjustment device 20 in FIG. 2 , and details will not be repeated here. The process 40 is the operation process of the color adjustment device 30 , the mixing parameter M of which is the product of the saturation gain parameter Sa and the intensity gain parameter Ia. If the process 40 is applied to the color adjustment device 20 , the operation of the multiplier is not required in step 414 , and the saturation gain parameter Sa is directly equivalent to the mixing parameter M. According to the process 40, the display device can adjust the color setting while effectively reducing noise interference to the low-saturation video mixed signal.

As can be seen from the foregoing, the known six-axis color correction technology is less intuitive for users and difficult to operate. The known color adjustment technology using a two-dimensional lookup table of the chroma signal can only independently adjust the hue and saturation of the color, but cannot adjust the intensity of the color, and thus cannot independently adjust the contrast of the displayed image. In contrast, through the present invention, the display device generates a hue signal and a saturation signal according to the chroma signal in the received video mixed signal, and adjusts the hue, saturation, and intensity of the chroma signal accordingly, and then adjusts Chroma signal and brightness signal. In this way, the user can independently adjust the contrast of the display screen so that the color and contrast of the display screen meet the user's requirements.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (22)

1. A method for adjusting color in a display device, comprising: receiving a video mixed signal, the video mixed signal includes a first chroma signal and a first luminance signal; generating a hue signal and a saturation signal at least according to the first chroma signal; generating an intensity gain parameter according to the hue signal and the saturation signal; generating a saturation gain parameter according to the hue signal; Generate a hue shift parameter according to the hue signal; adjusting the first luminance signal according to the intensity gain parameter to generate a second luminance signal; and The first chroma signal is adjusted according to a mixing parameter and the hue offset parameter to generate a second chroma signal, wherein the mixing parameter is generated according to the saturation gain parameter. 2. The method according to claim 1, wherein the step of generating the intensity gain parameter according to the hue signal and the saturation signal comprises: generating an initial intensity gain parameter according to the hue signal; generating a gain signal according to the saturation signal; and A noise suppression process is performed on the initial intensity gain parameter according to the gain signal to generate the intensity gain parameter. 3. The method as claimed in claim 2, wherein the step of generating the initial intensity gain parameter according to the hue signal is to interpolate the hue signal according to a plurality of intensity gain parameters to generate the initial intensity gain parameter. 4. The method as claimed in claim 1, wherein the step of generating the saturation gain parameter according to the hue signal is to interpolate the hue signal according to a plurality of saturation gain parameters to generate the saturation gain parameter. 5. The method as claimed in claim 1, wherein the step of generating the hue shift parameter according to the hue signal is to interpolate the hue signal according to a plurality of hue shift parameters to generate the hue shift parameter. 6. The method according to claim 1, wherein the step of adjusting the first luminance signal according to the intensity gain parameter to generate the second luminance signal is to multiply the intensity gain parameter by the first luminance signal , to generate the second luminance signal. 7. The method according to claim 1, wherein the step of adjusting the first chroma signal to generate the second chroma signal according to the mixing parameter and the hue shift parameter comprises: multiplying the first chroma signal with a rotation matrix formed by the hue shift parameter to generate an output signal; and The output signal is multiplied by the mixing parameter to generate the second chroma signal. 8. The method according to claim 1, wherein the step of adjusting the first chroma signal to generate the second chroma signal according to the mixing parameter and the hue shift parameter comprises: multiplying the first chroma signal by the mixing parameter to generate an output signal; and The output signal is multiplied by a rotation matrix formed by the hue offset parameter to generate the second chroma signal. 9. The method of claim 1, wherein the mixing parameter is the saturation gain parameter. 10. The method of claim 1, wherein the mixing parameter is a product of the saturation gain parameter and the intensity gain parameter. 11. The method according to claim 1, wherein the step of generating the hue signal and the saturation signal based on at least the first chroma signal is to mix and calculate the first chroma signal and the first luminance signal, to generate the hue signal and the saturation signal. 12. A color adjustment device used in a display device, comprising: A receiving end, used to receive a video mixed signal, the video mixed signal includes a first chroma signal and a first luminance signal; a signal generating unit, coupled to the receiving end, for generating a hue signal and a saturation signal at least according to the first chroma signal; an intensity corresponding unit, coupled to the signal generating unit, for generating an intensity gain parameter according to the hue signal and the saturation signal; a saturation corresponding unit, coupled to the signal generating unit, for generating a saturation gain parameter according to the hue signal; a hue corresponding unit, coupled to the signal generating unit, for generating a hue shift parameter according to the hue signal; a luminance signal processing unit, coupled to the receiving end and the intensity corresponding unit, for adjusting the first luminance signal according to the intensity gain parameter to generate a second luminance signal; and A chroma signal processing unit, coupled to the receiving end, the saturation corresponding unit, and the hue corresponding unit, used to adjust the first chroma signal according to a mixing parameter and the hue shift parameter to generate A second chroma signal, wherein the mixing parameter is generated according to the saturation gain parameter. 13. The color adjustment device as claimed in claim 12, wherein the intensity corresponding unit comprises: an initial intensity corresponding unit, coupled to the signal generating unit, for generating an initial intensity gain parameter according to the hue signal; a noise suppression unit, used to generate a gain signal according to the saturation signal; and A multiplier, coupled to the initial intensity corresponding unit and the noise suppression unit, is used for performing noise suppression processing on the initial intensity gain parameter according to the gain signal to generate the intensity gain parameter. 14. The color adjustment device according to claim 13, wherein the initial intensity corresponding unit comprises: a look-up table for storing a plurality of intensity gain parameters; and An interpolation operation unit is used for performing interpolation operation on the hue signal according to the plurality of intensity gain parameters to generate the initial intensity gain parameter. 15. The color adjustment device as claimed in claim 12, wherein the saturation corresponding unit comprises: a look-up table for storing a plurality of saturation gain parameters; and An interpolation operation unit is used for performing interpolation operation on the hue signal according to the plurality of saturation gain parameters to generate the saturation gain parameters. 16. The color adjustment device as claimed in claim 12, wherein the hue corresponding unit comprises: a look-up table for storing a plurality of hue shift parameters; and An interpolation operation unit is used for performing interpolation operation on the hue signal according to the plurality of hue shift parameters to generate the hue shift parameters. 17. The color adjustment device as claimed in claim 12, wherein the luminance signal processing unit is a multiplier for multiplying the intensity gain parameter by the first luminance signal to generate the second luminance signal. 18. The color adjustment device as claimed in claim 12, wherein the saturation signal processing unit comprises: a hue adjustment unit, coupled to the receiving end and the hue corresponding unit, for multiplying the first chroma signal by a rotation matrix formed by the hue offset parameter to generate an output signal; and A multiplier, coupled to the hue adjustment unit and the saturation corresponding unit, is used to multiply the output signal and the mixing parameter to generate the second saturation signal. 19. The color adjustment device as claimed in claim 12, wherein the saturation signal processing unit comprises: a multiplier, coupled to the receiving end and the saturation corresponding unit, for multiplying the first chroma signal and the mixing parameter to generate an output signal; and A hue adjusting unit, coupled to the multiplier and the hue corresponding unit, is used to multiply the output signal with a rotation matrix formed by the hue offset parameter to generate the second chroma signal. 20. The color adjustment device as claimed in claim 12, wherein the mixing parameter is the saturation gain parameter. 21. The color adjustment device as claimed in claim 12, further comprising a multiplier, coupled to the intensity corresponding unit, the saturation corresponding unit and the chroma signal processing unit, for combining the saturation gain parameter with The intensity gain parameters are multiplied to produce the mixing parameters. 22. The color adjustment device as claimed in claim 12, wherein the signal generation unit is further configured to mix and calculate the first chroma signal and the first luminance signal to generate the hue signal and the saturation signal.

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