CN101345813A - Image color compensation device and method - Google Patents
Image color compensation device and method Download PDFInfo
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- CN101345813A CN101345813A CNA2007101284299A CN200710128429A CN101345813A CN 101345813 A CN101345813 A CN 101345813A CN A2007101284299 A CNA2007101284299 A CN A2007101284299A CN 200710128429 A CN200710128429 A CN 200710128429A CN 101345813 A CN101345813 A CN 101345813A
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Abstract
The present invention provides an image color compensation devices and method thereof. The method includes: performing a color gamut conversion operation to a pixel point of an original image, in order to convert the first image signal value of the pixel point into a second image signal value of the color gamut plane, wherein the colour gamut plane is provided with a color compensation area; performing mathematical and logical calculus to the second image signal value in order to judge the position of the pixel point; and performing a compensating operation to the second image signal value when the pixel point is located in the color compensation area, so that the pixel point approaches to a prescribed direction in order to regulate the color of the pixel point. The inventive image color compensation devices and method thereof can effectively improve the quality of image color, and can furthermore regulate the color of image based on preferences of individual users.
Description
Technical field
The present invention is relevant for a kind of colors of image processing method, and is particularly to a kind of image color compensation device and its method.
Background technology
To the LCD that becomes main flow recently gradually, display is the indispensable information exchange instrument of modern always from the earliest cathode-ray tube display.Cathode-ray tube display is very ripe in various applications, and especially in the application of TV and computer demonstration, cathode-ray tube display provides the abundant colors performance.Because the consideration of volume and weight, cathode-ray tube display is not suitable in mobile computer and the PDA(Personal Digital Assistant).LCD is then because the little and lightweight factor of its volume has replaced traditional cathode-ray tube display in each application successively.
The recording method of the color attribute of conventional digital image, for example the pixel color attribute is represented with color coordinates such as RGB, YUV, YCbCr or YPbPr, in practical application, also be difficult for adjusting its color attribute according to the shown at that time color of each pixel, when the adjustment of the saturation that will carry out color or brightness, the saturation or the brightness of all colors in the picture can only be increased together or reduces, yet saturation or brightness for all colors on the human vision are not that consistent hobby is all arranged.For example, user A may like more saturated red and more undersaturated green, and user B may like more undersaturated redness and more saturated blueness.Therefore, if do not judge pixel color attribute at that time itself, but only fixing increases saturation or brightness together or reduces, and then can't allow the user obtain best visual effect.
Shortcoming according to above-mentioned known color adjustment technology the invention provides a kind of colors of image compensation method, makes image can adjust the color of image according to user's hobby voluntarily.
Summary of the invention
Based on this purpose, the present invention has disclosed a kind of colors of image compensation method, it 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 color compensatory zone 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 this 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.
Colors of image compensation method of the present invention, it more comprises the following steps: to form this color compensation 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 this color compensation zone, this second signal of video signal value is carried out this compensating operation, to adjust the color of this pixel.
Colors of image compensation method of the present invention, it comprises the following steps: more to judge that whether this pixel that is positioned at the 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.
Colors of image compensation method of the present invention, 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.
Colors of image compensation method of the present invention, wherein 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.
Colors of image compensation method of the present invention, wherein the operation of this color gamut conversion comprises that more RGB signal of video signal value with this pixel is converted into YUV signal of video signal value that should the colour gamut plane.
Colors of image compensation method of the present invention, wherein more comprise colour of skin accent (Skin Tone) in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, making this pixel transfer towards this colour of skin approaches, to adjust the colour of skin color of this pixel, make it near the colour of skin that sets.
Colors of image compensation method of the present invention, wherein more comprise a green hue (Green Tone) in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, make this pixel approach towards this green hue, to adjust the green tint of this pixel, make it near the green that sets.
Colors of image compensation method of the present invention, wherein more comprise a blue cast (Blue Tone) in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, make this pixel approach towards this blue cast, to adjust the blue color of this pixel, make it near the blueness that sets.
The present invention has more disclosed a kind of image color compensation device, and it comprises a colour gamut converting unit and a colors of image compensating unit.Gamut conversion unit 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 color compensatory zone on this colour gamut plane.The colors of image compensating unit is coupled to 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 this 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.
Image color compensation device of the present invention, wherein this gamut conversion unit forms this color compensation zone according to one first and one second, and this colors of image compensating unit is carried out this 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 this color compensation zone, this second signal of video signal value is carried out this compensating operation, to adjust the color of this pixel.
Image color compensation device of the present invention, wherein whether this colors of image compensating unit judgement is positioned at this pixel in this color compensation zone 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.
Image color compensation device of the present invention, wherein this predetermined direction is meant and approaches the direction that the colour of skin, green and blue three kinds of tones are positioned at the position on this colour gamut plane respectively.
Image color compensation device of the present invention, wherein this gamut conversion unit is converted into this pixel to YUV signal of video signal value that should the colour gamut plane.
Image color compensation device of the present invention, wherein 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.
Image color compensation device of the present invention, wherein more comprise colour of skin accent (Skin Tone) in this color compensation zone, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, making this pixel transfer towards this colour of skin approaches, to adjust the colour of skin color of this pixel, make it near the colour of skin that sets.
Image color compensation device of the present invention, wherein more comprise a green hue (Green Tone) in this color compensation zone, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, make this pixel approach towards this green hue, to adjust the green tint of this pixel, make it near the green that sets.
Image color compensation device of the present invention, wherein more comprise a blue cast (Blue Tone) in this color compensation zone, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, make this pixel approach towards this blue cast, to adjust the blue color of this pixel, make it near the blueness that sets.
Image color compensation device of the present invention and method thereof can effectively be improved the quality of colors of image, more can adjust the color of image according to user individual's hobby.
Description of drawings
Fig. 1 is the schematic diagram of image color compensation device of the present invention.
Fig. 2 carries out the Y-UV floor map of colors of image compensation for the present invention.
Fig. 3 is the flow chart of steps of colors of image compensation method of the present invention.
Embodiment
See also Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram of image color compensation device of the present invention.Fig. 2 carries out the Y-UV floor map of colors of image compensation for the present invention.As shown in Figures 1 and 2, image color compensation device 10 of the present invention comprises a colour gamut converting unit 12 and a colors of image compensating unit 14.Gamut conversion unit 12 is carried out a colour gamut conversion operations in order to the pixel 241～243 to a raw video, become the second signal of video signal value on a corresponding colour gamut plane 20 with the first signal of video signal value of changing this pixel 241～243, have a color compensatory zone 21～23 on this colour gamut plane 20.Colors of image compensating unit 14 is coupled to gamut conversion unit 12, it is in order to carry out mathematics and logical operation to judge the position of this pixel 241～243 to the second signal of video signal value, and when this pixel 241～243 is positioned at color compensation zone 21～23, the second signal of video signal value is carried out a compensating operation, make this pixel 241～243 approach, to adjust the color of this pixel 241～243 towards a predetermined direction.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 20 respectively, is the direction of arrow indication among Fig. 2.
In an embodiment, whether image compensation unit 14 further judgement is positioned at the pixel 241～243 in color compensation zone 21～23 by overcompensation, and if pixel 241～243 by overcompensation, then adjust the pixel value of pixel 241～243, thereby obtain last output image 16, otherwise, then pixel 241～243 is directly exported, with output image 16.
Wherein, gamut conversion unit 12 is converted into pixel 241～243 to Y-UV signal of video signal value that should colour gamut plane 20.In another embodiment, gamut conversion unit 12 is converted into the RGB signal of video signal value of this pixel 241～243 to Y-UV signal of video signal value that should colour gamut plane 20.
In an embodiment, more comprise colour of skin accent (SkinTone) 32 in the color compensation zone 21, when 14 pairs second signal of video signal values of colors of image compensating unit are carried out this compensating operation, make this pixel 241 transfer 32 to approach towards this colour of skin, to adjust the colour of skin color of this pixel 241, make it near the colour of skin that sets.
In an embodiment, then comprise a green hue (GreenTone) 34 in the color compensation zone 22, when 14 pairs of these second signal of video signal values of colors of image compensating unit are carried out this compensating operation, make this pixel 242 approach towards this green hue 34, to adjust the green tint of this pixel 242, make it near the green that sets.
In another embodiment, more comprise a blue cast (BlueTone) 36 in the color compensation zone 23, when 14 pairs of these second signal of video signal values of colors of image compensating unit are carried out this compensating operation, make this pixel 243 approach towards this blue cast 36, to adjust the blue color of this pixel 243, make it near the blueness that sets.
The method of adjustment that shows three kinds of different colors in the foregoing description, the principle of its adjustment is all identical, difference only is the different quadrants that three color compensation zones 21～23 among the different embodiment lay respectively at the Y-UV plane, therefore, image color compensation device 10 of the present invention can be adjusted three kinds of colors according to the application choice of reality, for example, can select in regular turn only to adjust three kinds of colors one of them, perhaps adjust two or three color simultaneously.
See also Fig. 3, Fig. 3 is the flow chart of steps of colors of image compensation method of the present invention.Colors of image compensation method of the present invention comprises the following steps:
S50: the benchmark tone that defines color earlier;
S52 a: pixel of a 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 color compensatory zone on this colour gamut plane; Form the color compensation zone according to one first and one second.
S54: the second signal of video signal value is carried out mathematics and logical operation to judge the position of this pixel;
S56: when this pixel is positioned at the color compensation zone, the 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.If pixel is not when being positioned at the color compensation zone, then do not carry out this compensating operation, directly export this pixel, output image (step S62).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.
S58: judge whether to be positioned at this pixel in color compensation zone by overcompensation; And
S60:, then adjusted the pixel value of this pixel, thereby obtain last output image by overcompensation as if this pixel, otherwise, then this pixel is directly exported, with output image (step S62).In an embodiment, when carrying out the colors of image compensation at the beginning, can set the scope of desiring the compensation pixel value earlier, pixel value scope-128～127 for example, whereby, when step S58 judges pixel value because carrying out above-mentioned compensating operation (step S56) during by overcompensation, step S60 can adjust the pixel value of this pixel, make it meet the pixel value scope-128～127 that sets at the beginning, for example, when the intact pixel value of compensating operation surpasses 127, then pixel value can be adjusted into 127, in an embodiment, pixel whether can be decided in its sole discretion by the user by overcompensation, and set up the scope of its pixel value on their own, when the pixel value after pixel is by compensating operation surpasses the pixel value scope that the user sets, can be about to the pixel value adjustment certainly and return max pixel value or the minimum pixel value that the user sets, so can make the color of pixel meet each user's demand.
S62: output image.
Color gamut conversion operation then is converted into this pixel YUV signal of video signal value that should the colour gamut plane.And among another embodiment, color gamut conversion operation 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.
In an embodiment, more comprise colour of skin accent (SkinTone) in the color compensation zone, when this second signal of video signal value is carried out this compensating operation, make this pixel transfer and approach towards this colour of skin, to adjust the colour of skin color of this pixel, make it near the colour of skin that sets.
In another embodiment, more comprise a green hue (Green Tone) in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, make this pixel approach towards this green hue, to adjust the green tint of this pixel, make it near the green that sets.
In another embodiment, more comprise a blue cast (BlueTone) in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, make this pixel approach towards this blue cast, to adjust the blue color of this pixel, make it near the blueness that sets.
Above-described color compensation zone, the colour of skin is transferred, green hue and blue cast, can set according to actual use, for example, can adjust the scope in color compensation zone voluntarily, determine the pixel in which zone need carry out color compensation, and also can be according to different users's hobby, carry out the setting of these three kinds of tones, after having set these three kinds of tones, transfer according to the colour of skin after setting again, green hue and blue cast, adjustment is positioned at the pixel in color compensation zone, so can effectively adjust the color of image, reaches the demand of different users to image quality.
Colors of image compensation method of the present invention and device thereof are not limited to image is carried out the above-mentioned colour of skin, green and blue color adjustment, so long as utilize compensation method of the present invention to carry out the method for various color compensations, all can become application of the present invention.
As from the foregoing, the invention provides a kind of colors of image compensation method and device thereof, with the pixel that falls in the predefined color compensation zone, hobby according to the user, it is carried out color compensation, make it approach colour of skin accent, green hue and blue cast respectively, the performance color that so can make the pixel of accepting compensation is near the colour of skin, the green and blue that set.Can effectively improve the quality of colors of image, more can adjust the color of image according to user individual's hobby.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
10: image color compensation device
12: gamut conversion unit
14: the colors of image compensating unit
16: the output image
20: the colour gamut plane
21～23: the color compensation zone
241～243: pixel
201～203: first
204～206: second
32: the colour of skin is transferred
34: green hue
36: blue cast
S50～S62: method step
Claims (18)
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 color compensatory zone 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 this 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.
2. colors of image compensation method according to claim 1 is characterized in that, more comprises the following steps:
Form this color compensation 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 this 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 and whether be positioned at this pixel in color compensation zone 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, 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.
5. 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.
6. colors of image compensation method according to claim 5 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.
7. colors of image compensation method according to claim 1, it is characterized in that, more comprise colour of skin accent in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, making this pixel transfer towards this colour of skin approaches, to adjust the colour of skin color of this pixel, make it near the colour of skin that sets.
8. colors of image compensation method according to claim 1, it is characterized in that, more comprise a green hue in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, make this pixel approach towards this green hue, to adjust the green tint of this pixel, make it near the green that sets.
9. colors of image compensation method according to claim 1, it is characterized in that, more comprise a blue cast in this color compensation zone, when this second signal of video signal value is carried out this compensating operation, make this pixel approach towards this blue cast, to adjust the blue color of this pixel, make it near the blueness that sets.
10. 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 color compensatory zone 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 this 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.
11. image color compensation device according to claim 10, it is characterized in that, this gamut conversion unit forms this color compensation zone according to one first and one second, and this colors of image compensating unit is carried out this 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 this color compensation zone, this second signal of video signal value is carried out this compensating operation, to adjust the color of this pixel.
12. image color compensation device according to claim 10, it is characterized in that, whether this colors of image compensating unit judgement is positioned at this pixel in this color compensation zone 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.
13. image color compensation device according to claim 10 is characterized in that, this predetermined direction is meant and approaches the direction that the colour of skin, green and blue three kinds of tones are positioned at the position on this colour gamut plane respectively.
14. image color compensation device according to claim 10 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.
15. image color compensation device according to claim 14 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.
16. image color compensation device according to claim 10, it is characterized in that, more comprise colour of skin accent in this color compensation zone, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, making this pixel transfer towards this colour of skin approaches, to adjust the colour of skin color of this pixel, make it near the colour of skin that sets.
17. image color compensation device according to claim 10, it is characterized in that, more comprise a green hue in this color compensation zone, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, make this pixel approach towards this green hue, to adjust the green tint of this pixel, make it near the green that sets.
18. image color compensation device according to claim 10, it is characterized in that, more comprise a blue cast in this color compensation zone, when this colors of image compensating unit is carried out this compensating operation to this second signal of video signal value, make this pixel approach towards this blue cast, to adjust the blue color of this pixel, make it near the blueness that sets.
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| CN2007101284299A CN101345813B (en) | 2007-07-10 | 2007-07-10 | Image color compensation device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282647A (en) * | 2018-01-31 | 2018-07-13 | 上海小蚁科技有限公司 | Color correcting method and device, computer readable storage medium, terminal |
| CN113965735A (en) * | 2020-07-21 | 2022-01-21 | 瑞昱半导体股份有限公司 | Image decolouring band judging method and its image decolouring band judging circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100237637B1 (en) * | 1996-06-04 | 2000-01-15 | 구자홍 | Skin color reproduction apparatus and method |
| CN100584036C (en) * | 2005-11-28 | 2010-01-20 | 普诚科技股份有限公司 | Image compensating device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108282647A (en) * | 2018-01-31 | 2018-07-13 | 上海小蚁科技有限公司 | Color correcting method and device, computer readable storage medium, terminal |
| CN108282647B (en) * | 2018-01-31 | 2019-11-05 | 上海小蚁科技有限公司 | Color correcting method and device, computer readable storage medium, terminal |
| US10848728B2 (en) | 2018-01-31 | 2020-11-24 | Shanghai Xiaoyi Technology Co., Ltd. | Color correction method and device, and computer-readable storage medium thereof |
| CN113965735A (en) * | 2020-07-21 | 2022-01-21 | 瑞昱半导体股份有限公司 | Image decolouring band judging method and its image decolouring band judging circuit |
| CN113965735B (en) * | 2020-07-21 | 2024-03-01 | 瑞昱半导体股份有限公司 | Image color-removing band judging method and image color-removing band judging circuit |
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