CN101345813B - Image color compensation device and method thereof - Google Patents

Abstract

The invention provides an image color compensation device and a method thereof. A color gamut conversion operation is performed on a pixel of an original image to convert a first image signal value of the pixel into a second image signal value corresponding to a color gamut plane, wherein the color gamut plane has a color compensation area. And performing mathematical and logical operations on the second image signal value to determine the position of the pixel point. And when the pixel point is positioned in the color compensation area, executing a compensation operation on the second image signal value to enable the pixel point to approach to a preset direction so as to adjust the color of the pixel point. The image color compensation device and the method thereof can effectively improve the quality of the image color and can adjust the color of the image according to personal preference of a user.

Description

Image color compensation device and method thereof

technical field

The present invention relates to an image color processing method, and particularly relates to an image color compensation device and its method. the

Background technique

From the earliest cathode ray tube monitors to the more recent liquid crystal monitors that have gradually become mainstream, monitors have always been an indispensable tool for modern people to exchange information. The cathode ray tube display has been very mature in various application fields, especially in the application of television and computer display, the cathode ray tube display provides rich color performance. CRT displays are less suitable for notebook computers and personal digital assistants (PDAs) due to size and weight considerations. Liquid crystal displays have gradually replaced traditional cathode ray tube displays in various application fields because of their small size and light weight. the

The traditional method of recording color attributes of digital images, such as expressing pixel color attributes in RGB, YUV, YCbCr, or YPbPr color coordinates, is not easy to adjust the color attributes of each pixel according to the color displayed at that time in practical applications. When adjusting the saturation or brightness of a color, the saturation or brightness of all colors in the picture can only be increased or decreased together. However, human beings do not have the same preference for the saturation or brightness of all colors visually. For example, user A may like more saturated red and less saturated green, while user B may like less saturated red and more saturated blue. Therefore, if the color attribute of the pixel itself is not judged at that time, but the saturation and the brightness are only fixedly increased or decreased together, the user cannot obtain the best visual effect. the

According to the disadvantages of the above-mentioned known color adjustment techniques, the present invention provides an image color compensation method, so that the image color can be adjusted according to the user's preference. the

Contents of the invention

Based on this purpose, the present invention discloses an image color compensation method, which includes the following steps of performing a color gamut conversion operation on a pixel of an original image, so as to convert the first image signal value of the pixel into a corresponding color gamut A second image signal value of the plane, wherein the color gamut plane has a color compensation area; performing a mathematical and logic operation on the second image signal value to determine the position of the pixel; and when the pixel is located in the color compensation area When it is inside, a compensation operation is performed on the second image signal value, so that the pixel point approaches a predetermined direction to adjust the color of the pixel point; wherein the predetermined direction refers to approaching the three hues of skin color, green and blue in The orientation of the position on this gamut plane. the

The image color compensation method of the present invention further includes the following steps: forming the color compensation area according to a first axis and a second axis; performing the mathematical and logical operation on the second image signal value to determine the pixel and when the pixel is located in the color compensation area, performing the compensation operation on the second image signal value to adjust the color of the pixel. the

The image color compensation method of the present invention further includes the following steps: judging whether the pixel in the color compensation area is over-compensated; and if the pixel is over-compensated, adjusting the pixel value of the pixel, thereby Obtain the final output image, otherwise, directly output the pixel to generate an image. the

In the image color compensation method of the present invention, the color gamut conversion operation further includes converting the pixel into a YUV image signal value corresponding to the color gamut plane. the

In the image color compensation method of the present invention, the color gamut conversion operation further includes converting the RGB image signal value of the pixel into a YUV image signal value corresponding to the color gamut plane. the

In the image color compensation method of the present invention, wherein the color compensation area further includes a skin tone (Skin Tone), when the compensation operation is performed on the second image signal value, the pixel is approached to the skin tone, to adjust the skin color of the pixel to make it close to the set skin color. the

In the image color compensation method of the present invention, wherein the color compensation area further includes a green tone (Green Tone), when the compensation operation is performed on the second image signal value, the pixel is approached to the green tone, to adjust the green color of the pixel to make it close to the set green color. the

In the image color compensation method of the present invention, wherein the color compensation area further includes a blue tone (Blue Tone), when the compensation operation is performed on the second image signal value, the pixel is approached to the blue tone, to adjust the blue color of the pixel to make it close to the set blue color. the

The invention further discloses an image color compensation device, which includes a color gamut conversion unit and an image color compensation unit. The color gamut conversion unit is used to perform a color gamut conversion operation on a pixel of an original image, so as to convert the first image signal value of the pixel into a second image signal value corresponding to a color gamut plane, wherein the color gamut plane is There is a color compensation area. The image color compensation unit is coupled to the color gamut conversion unit, which is used to perform mathematical and logical operations on the second image signal value to determine the position of the pixel, and when the pixel is located in the color compensation area, the second A compensation operation is performed on the two image signal values, so that the pixel point approaches a predetermined direction to adjust the color of the pixel point, wherein the predetermined direction refers to respectively approaching the three hues of skin color, green and blue on the color gamut plane The direction of the location. the

The image color compensation device of the present invention, wherein the color gamut conversion unit forms the color compensation area according to a first axis and a second axis, and the image color compensation unit performs the math and logic on the second image signal value The operation is performed to determine the position of the pixel, and when the pixel is located in the color compensation area, the compensation operation is performed on the second image signal value to adjust the color of the pixel. the

The image color compensation device of the present invention, wherein the image color compensation unit judges whether the pixel located in the color compensation area is over-compensated, and if the pixel is over-compensated, adjusts the pixel value of the pixel, Therefore, the final output image is obtained, otherwise, the pixel is directly output to generate an image. the

In the image color compensation device of the present invention, the color gamut converting unit converts the pixel into a YUV image signal value corresponding to the color gamut plane. the

In the image color compensation device of the present invention, the color gamut conversion unit converts the RGB image signal value of the pixel into a YUV image signal value corresponding to the color gamut plane. the

In the image color compensation device of the present invention, wherein the color compensation area further includes a skin tone (Skin Tone), when the image color compensation unit performs the compensation operation on the second image signal value, the pixel points toward The skin tone approximation is used to adjust the skin color of the pixel to make it close to the set skin color. the

The image color compensation device according to the present invention, wherein the color compensation area further includes a green tone (Green Tone), when the image color compensation unit performs the compensation operation on the second image signal value, the pixel point faces The green hue is approximated to adjust the green color of the pixel to make it close to the set green. the

The image color compensation device of the present invention, wherein the color compensation area further includes a blue tone (Blue Tone), when the image color compensation unit executes the compensation operation on the second image signal value, the pixel point faces The blue hue is approximated to adjust the blue color of the pixel to make it close to the set blue. the

The image color compensation device and method thereof described in the present invention can effectively improve the image color quality, and can adjust the image color according to the user's personal preference. the

Description of drawings

FIG. 1 is a schematic diagram of an image color compensation device of the present invention. the

FIG. 2 is a schematic diagram of a Y-UV plane for performing image color compensation in the present invention. the

FIG. 3 is a flow chart of the steps of the image color compensation method of the present invention. the

Detailed ways

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a schematic diagram of an image color compensation device of the present invention. FIG. 2 is a schematic diagram of a Y-UV plane for performing image color compensation in the present invention. As shown in FIGS. 1 and 2 , the image color compensation device 10 of the present invention includes a color gamut conversion unit 12 and an image color compensation unit 14 . The color gamut conversion unit 12 is used to perform a color gamut conversion operation on a pixel point 241-243 of an original image, so as to convert the first image signal value of the pixel point 241-243 into a second image signal corresponding to a color gamut plane 20 value, the color gamut plane 20 has a color compensation area 21-23. The image color compensation unit 14 is coupled to the color gamut conversion unit 12, and is used for performing mathematical and logical operations on the second image signal value to determine the positions of the pixels 241-243, and when the pixels 241-243 are located in the color compensation In the area 21-23, a compensation operation is performed on the value of the second image signal, so that the pixels 241-243 approach a predetermined direction, so as to adjust the color of the pixels 241-243. The predetermined direction refers to the directions respectively approaching the positions of the three hues of skin color, green and blue on the color gamut plane 20 , which is the direction indicated by the arrow in FIG. 2 . the

The color gamut conversion unit 12 forms color compensation areas 21-23 according to a first axis 201-203 and a second axis 204-206, and the image color compensation unit 14 performs mathematical and logical operations on the second image signal value to determine the pixel For the position of points 241-243, in one embodiment, first calculate the distance between each pixel point 241-243 and the origin, and then use the distance to calculate the angle between it and the origin, through which the pixel point 241-243 can be known Whether 243 is located in the color compensation area 21-23, and when the pixel point 241-243 is located in the color compensation area 21-23, perform a compensation operation on the second image signal value to adjust the color of the pixel point 241-243. the

In one embodiment, the image compensation unit 14 further determines whether the pixels 241-243 located in the color compensation area 21-23 are over-compensated, and if the pixels 241-243 are over-compensated, adjust the pixels 241-243 The pixel values of , so as to obtain the final output image 16 , otherwise, directly output the pixel points 241 - 243 to output the image 16 . the

Wherein, the color gamut conversion unit 12 converts the pixels 241 - 243 into Y-UV image signal values corresponding to the color gamut plane 20 . In another embodiment, the color gamut conversion unit 12 converts the RGB image signal values of the pixels 241 - 243 into Y-UV image signal values corresponding to the color gamut plane 20 . the

In one embodiment, the color compensation area 21 further includes a skin tone (SkinTone) 32. When the image color compensation unit 14 performs the compensation operation on the second image signal value, the pixel point 241 approaches the skin tone 32. , to adjust the skin color of the pixel 241 to make it close to the set skin color. the

In one embodiment, the color compensation area 22 includes a green tone (GreenTone) 34, and when the image color compensation unit 14 performs the compensation operation on the second image signal value, the pixel point 242 moves toward the green tone 34 Approximate to adjust the green color of the pixel 242 to make it close to the set green color. the

In another embodiment, the color compensation area 23 further includes a blue tone (BlueTone) 36, when the image color compensation unit 14 performs the compensation operation on the second image signal value, the pixel point 243 will move toward the blue tone 36 approximation to adjust the blue color of the pixel 243 to make it close to the set blue color. the

The above-mentioned embodiments show three different color adjustment methods, and the adjustment principles are the same, the only difference is that the color compensation areas 21-23 in the three different embodiments are respectively located in different quadrants of the Y-UV plane. Therefore, The image color compensation device 10 of the present invention can select and adjust three colors according to actual applications, for example, it can select to adjust only one of the three colors in sequence, or adjust two or three colors at the same time. the

Please refer to FIG. 3 . FIG. 3 is a flowchart of steps of the image color compensation method of the present invention. The image color compensation method of the present invention comprises the following steps:

S50: Define the base tone of the color first;

S52: Perform a color gamut conversion operation on a pixel of an original image, so as to convert the first image signal value of the pixel into a second image signal value corresponding to a color gamut plane, wherein the color gamut plane has a color compensation Area; forming a color compensation area according to a first axis and a second axis. the

S54: Perform mathematical and logical operations on the second image signal value to determine the position of the pixel;

S56: When the pixel is located in the color compensation area, perform a compensation operation on the second image signal value, so that the pixel approaches a predetermined direction, so as to adjust the color of the pixel. If the pixel is not located in the color compensation area, the compensation operation is not performed, and the pixel is directly output to generate an image (step S62). Wherein, the predetermined direction refers to directions respectively approaching the positions of the three hues of skin color, green and blue on the color gamut plane. the

S58: judging whether the pixel located in the color compensation area is over-compensated; and

S60: If the pixel is overcompensated, adjust the pixel value of the pixel to obtain a final output image; otherwise, directly output the pixel to generate an image (step S62). In one embodiment, when image color compensation is first performed, the range of pixel values to be compensated can be set first, for example, the range of pixel values -128 to 127, so that when step S58 determines that the pixel value is due to the aforementioned compensation operation (step S56) and when it is over compensated, step S60 can adjust the pixel value of the pixel point to make it conform to the pixel value range -128～127 set at the beginning, for example, when the pixel value after the compensation operation exceeds 127 , the pixel value will be adjusted to 127. In one embodiment, the user can decide whether the pixel is over-compensated, and set the range of its pixel value. When the pixel value after the compensation operation exceeds the used When the pixel value range set by the user is selected, the pixel value will be automatically adjusted back to the maximum or minimum pixel value set by the user, so that the color of the pixel can meet the needs of each user. the

S62: Generate an image. the

The color gamut conversion operation converts the pixel into a YUV image signal value corresponding to the color gamut plane. In another embodiment, the color gamut conversion operation further includes converting the RGB image signal value of the pixel into a YUV image signal value corresponding to the color gamut plane. the

In one embodiment, the color compensation area further includes a skin tone (SkinTone), and when the compensation operation is performed on the second image signal value, the pixel is approached to the skin tone to adjust the skin tone of the pixel color to make it closer to the skin tone you set. the

In another embodiment, the color compensation area further includes a green tone (Green Tone), when the compensation operation is performed on the second image signal value, the pixel is approached to the green tone to adjust the pixel The green tint of the point, making it close to the set green. the

In another embodiment, the color compensation area further includes a blue tone (BlueTone), when the compensation operation is performed on the second image signal value, the pixel is made to approach the blue tone to adjust the pixel to make it closer to the set blue color. the

The color compensation area, skin tone, green tone, and blue tone mentioned above can be set according to the actual use. For example, the range of the color compensation area can be adjusted to determine which pixels in the area need to be color compensated. It is also possible to set the three color tones according to the preferences of different users. After setting the three tones, adjust the color within the color compensation area according to the set skin tones, green tones and blue tones. Pixels, so that the color of the image can be effectively adjusted to meet the needs of different users for image quality. the

The image color compensation method and its device of the present invention are not limited to adjusting the above-mentioned skin color, green and blue color of the image, as long as the compensation method of the present invention is used to perform various color compensation methods, all can be applied to the present invention field. the

As can be seen from the above, the present invention provides an image color compensation method and device thereof, which perform color compensation on the pixels falling into the preset color compensation area according to the user's preferences, so that they are respectively close to skin tone, Green tint and blue tint, so that the performance color of the compensated pixel is close to the set skin color, green and blue. It can effectively improve the image color quality, and adjust the image color according to the user's personal preference. the

The above description is only a preferred embodiment of the present invention, but it is not intended to limit the scope of the present invention. Any person familiar with this technology can make further improvements on this basis without departing from the spirit and scope of the present invention. Improvements and changes, so the protection scope of the present invention should be defined by the claims of the present application. the

A brief description of the symbols in the drawings is as follows:

10: Image color compensation device

12: Color gamut conversion unit

14: Image color compensation unit

16: Produce images

20: Gamut plane

21~23: Color Compensation Area

241～243: Pixels

201～203: the first axis

204～206: Second axis

32: skin tone

34: Green tone

36: blue tone

S50～S62: method steps

Claims (16)

1. a colors of image compensation method is characterized in that, comprises the following steps:

One pixel of one raw video is carried out a colour gamut conversion operations; Become the second signal of video signal value on a corresponding colour gamut plane with the first signal of video signal value of changing this pixel; Wherein have a plurality of color compensations zone on this colour gamut plane, said color compensation zone lays respectively at the different quadrants on this colour gamut plane;

This second signal of video signal value is carried out mathematics and logical operation to judge the position of this pixel; And

When this pixel is positioned at one of said color compensation zone, this second signal of video signal value is carried out a compensating operation, make this pixel approach, to adjust the color of this pixel towards a predetermined direction;

Wherein this predetermined direction is meant the direction of approaching the colour of skin, green and blue three kinds of tone positions on this colour gamut plane respectively; This colour of skin, green and blue cast lay respectively at the set zone in the said color compensation zone, and the set zone at the set zone at this green hue place and this blue cast place is surrounded by a curve respectively.

2. colors of image compensation method according to claim 1 is characterized in that, more comprises the following steps:

Form each color compensatory zone according to one first and one second;

This second signal of video signal value is carried out this mathematics and logical operation to judge the position of this pixel; And

When this pixel is positioned at one of said color compensation zone, this second signal of video signal value is carried out this compensating operation, to adjust the color of this pixel.

3. colors of image compensation method according to claim 1 is characterized in that, more comprises the following steps:

Judge that whether this pixel that is positioned at the color compensation zone is by overcompensation; And

If this pixel by overcompensation, is then adjusted the pixel value of this pixel, thereby is obtained last output image, otherwise, then this pixel is directly exported, with the output image.

4. colors of image compensation method according to claim 1 is characterized in that, the operation of this color gamut conversion more comprises this pixel is converted into YUV signal of video signal value that should the colour gamut plane.

5. colors of image compensation method according to claim 4 is characterized in that, the operation of this color gamut conversion comprises that more the RGB signal of video signal value with this pixel is converted into YUV signal of video signal value that should the colour gamut plane.

6. colors of image compensation method according to claim 1; It is characterized in that; Said set zone comprises colour of skin accent, when this second signal of video signal value is carried out this compensating operation, makes this pixel transfer towards this colour of skin and approaches; To adjust the colour of skin color of this pixel, make it near the colour of skin that sets.

7. colors of image compensation method according to claim 1; It is characterized in that; Said set zone comprises a green hue, when this second signal of video signal value is carried out this compensating operation, makes this pixel approach towards this green hue; To adjust the green tint of this pixel, make it near the green that sets.

8. colors of image compensation method according to claim 1; It is characterized in that; Said set zone comprises a blue cast, when this second signal of video signal value is carried out this compensating operation, makes this pixel approach towards this blue cast; To adjust the blue color of this pixel, make it near the blueness that sets.

9. an image color compensation device is characterized in that, comprising:

One colour gamut converting unit; It is in order to carry out a colour gamut conversion operations to a pixel of a raw video; Become the second signal of video signal value on a corresponding colour gamut plane with the first signal of video signal value of changing this pixel; Wherein have a plurality of color compensations zone on this colour gamut plane, said color compensation zone lays respectively at the different quadrants on this colour gamut plane; And

One colors of image compensating unit; Be coupled to this gamut conversion unit; It is in order to carry out mathematics and logical operation to judge the position of this pixel to this second signal of video signal value; And when this pixel is positioned at one of said color compensation zone, this second signal of video signal value is carried out a compensating operation, make this pixel approach towards a predetermined direction; To adjust the color of this pixel; Wherein this predetermined direction is meant the direction of approaching the colour of skin, green and blue three kinds of tone positions on this colour gamut plane respectively, and this colour of skin, green and blue cast lay respectively at the set zone in the said color compensation zone, and the set zone at the set zone at this green hue place and this blue cast place is surrounded by a curve respectively.

10. image color compensation device according to claim 9; It is characterized in that; This gamut conversion unit forms each color compensatory zone according to one first and one second, and this colors of image compensating unit is carried out this mathematics and logical operation judging the position of this pixel to this second signal of video signal value, and is positioned at said color compensation when one of regional when this pixel; This second signal of video signal value is carried out this compensating operation, to adjust the color of this pixel.

11. image color compensation device according to claim 9 is characterized in that, this colors of image compensating unit judges that whether this pixel that is positioned at this color compensation zone is by overcompensation; And if this pixel by overcompensation; Then adjust the pixel value of this pixel, thereby obtain last output image, otherwise; Then this pixel is directly exported, with the output image.

12. image color compensation device according to claim 9 is characterized in that, this gamut conversion unit is converted into this pixel to YUV signal of video signal value that should the colour gamut plane.

13. image color compensation device according to claim 12 is characterized in that, this gamut conversion unit is converted into the RGB signal of video signal value of this pixel to YUV signal of video signal value that should the colour gamut plane.

14. image color compensation device according to claim 9; It is characterized in that; Said set zone comprises colour of skin accent, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, makes this pixel transfer towards this colour of skin and approaches; To adjust the colour of skin color of this pixel, make it near the colour of skin that sets.

15. image color compensation device according to claim 9; It is characterized in that; Said set zone comprises a green hue, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, makes this pixel approach towards this green hue; To adjust the green tint of this pixel, make it near the green that sets.

16. image color compensation device according to claim 9; It is characterized in that; Said set zone comprises a blue cast, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, makes this pixel approach towards this blue cast; To adjust the blue color of this pixel, make it near the blueness that sets.

Images