CN101094307B - Color correction method and color correction device - Google Patents
Color correction method and color correction device Download PDFInfo
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- CN101094307B CN101094307B CN200710138014XA CN200710138014A CN101094307B CN 101094307 B CN101094307 B CN 101094307B CN 200710138014X A CN200710138014X A CN 200710138014XA CN 200710138014 A CN200710138014 A CN 200710138014A CN 101094307 B CN101094307 B CN 101094307B
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- correction
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Abstract
The method comprises: according to a first correcting data, correcting the first corrected color; defining a second corrected color, the distance between the second corrected color and the first corrected color is less or equals a distance parameter; according to the first correcting data and the distance parameter, calculating the second correcting data; according to the second correcting data, correcting the second corrected color.
Description
Technical field
The present invention relates to a kind of image processing technique, and relate in particular to a kind of color correction technology.
Background technology
Existing image processing technique can carry out color correct, for example skyblue, grass green, colour of skin correction etc. at hobby look in the image.Yet through the color after the color correct, its color contrast with vicinity tends to quite big in the image.Generally speaking, people's vision system can be considered as the same area with the part that contrast in the image differs less; Otherwise people's vision system can be considered as a border with the part that contrast in the image differs bigger.Therefore be easy to generate the problem of false contouring (False Contour) through the image of color correct.
In view of this, prior art then develops and various technology so as to eliminating the problem of false contouring, for example international information in 2006 shows (the Society of Information Display of association, be called for short SID) seminar wherein number 49.3 document and proposed a kind of method that reduces false contouring, be applicable to and revise skin color in the image and cause image the false contouring situation to occur.At first, image is converted to the YUV color space from rgb color space.Then, detect the zone that has skin color in the image.The skin color utilization reflection conversion (Affine Transform) of above-mentioned zone is produced the skin color of hobby.And then utilize erosion (Erosion) to eliminate false contouring, yet the computing of the method is quite complicated.
Therefore, if can there be simpler image processing technique can eliminate the problem of false contouring, not only can improve the image processing ability of electronic product, can increase the processing speed of electronic product, also have sizable help for the reduction of hardware cost and the realization of hardware.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of color correction method, so as to avoiding the false contouring problem, increases the quality of image.
Another problem to be solved by this invention is to provide a kind of color correction equipment, so as to avoiding the false contouring problem, reduces hardware cost.
For achieving the above object, the present invention proposes a kind of color correction method, comprises receiving first correction and distance parameter, and revises look according to the first correction correction first.In addition, look is revised in definition second, and wherein second distance of revising the look and the first correction look is less than or equal to distance parameter.In addition, according to first correction and distance calculation second correction, and according to the second correction correction, the second correction look.
In one embodiment of this invention, second correction increases along with distance and reduces, and second correction increases and increases along with first correction.In another embodiment, second correction is
D wherein
0Be distance parameter, D
iBe distance, Δ x is first correction.
In one embodiment of this invention, above-mentioned color correction method also is included in to be revised before each correction look, each is revised look be converted to second color space from first color space.In addition, revised each and revised after the look, each has been revised look be converted to first color space from second color space.
In one embodiment of this invention, above-mentioned color correction method also comprises according to the designated color definition first correction look.In another embodiment, above-mentioned color correction method also comprises according to the definitions of color first of specified pixel and revises look.
The present invention proposes a kind of color correction equipment, comprises choosing unit and color correction unit.Choose the unit and revise look, and revise look, wherein second revise look for being less than or equal to distance parameter with first distance of revising look according to distance parameter definition second in order to define first.Color correction unit couples chooses the unit.Color correction unit is revised look and is revised look according to the second correction correction second according to the first correction correction first, and wherein second correction is to be got by first correction and distance calculation.
In one embodiment of this invention, above-mentioned color correction equipment also comprises first converting unit and second converting unit.First converting unit couples color correction unit.Before each revised look in the color correction unit correction, first converting unit was revised look with each earlier and is converted to second color space from first color space.Second converting unit couples color correction unit.After intact each of color correction unit correction revised look, second converting unit was revised look with each again and is converted to first color space from second color space.
The present invention is in the correction first correction look, and the distance that foundation first is revised between the look and the second correction look has been revised the second correction look that is adjacent to the first correction look.Therefore, can improve the problem of false contouring, so as to increasing the quality of image.
Adopt the present invention, by the setpoint distance parameter, can determine second to revise the scope that look is contained, therefore can make the colour gamut of desiring to carry out color correction in the color space have more elasticity changes, and, choose the unit and can choose first according to the color of a specified pixel or a designated color and revise look, make that color correction is easier carries out.
For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
Description of drawings
Fig. 1 is the schematic diagram according to a kind of color correction equipment of the first embodiment of the present invention;
Fig. 2 is the flow chart according to a kind of color correction method of the first embodiment of the present invention;
Fig. 3 is a kind of one dimension color space schematic diagram according to the first embodiment of the present invention;
Fig. 4 is the schematic diagram according to a kind of color correction equipment of the second embodiment of the present invention.
Wherein, Reference numeral:
10,11: color correction equipment
20: choose the unit
30: color correction unit
40,42: converting unit
C
1～C
9: adjacent color on the color space
S101～S106: each step of a kind of color correction method of the first embodiment of the present invention
Embodiment
Fig. 1 is the schematic diagram according to a kind of color correction equipment of the first embodiment of the present invention.Fig. 2 is the flow chart of a kind of color correction method of illustrating according to Fig. 1.Fig. 3 is the schematic diagram according to a kind of one dimension color space of the first embodiment of the present invention.Please merge with reference to Fig. 1～Fig. 3, color correction equipment 10 comprises chooses unit 20 and color correction unit 30.Choose unit 20 and revise look in order to choose first.Color correction unit 30 couples chooses unit 20, in order to revise color.
Suppose that 10 pairs first of color correction equipment revise the problem of wanting to improve false contouring when look carries out color correction again, then can carry out color correction according to the color correction method of present embodiment.For instance, at first by step S101, utilization is chosen unit 20 and is chosen the first correction look, and the first correction look for example is C
5By step S102, utilize color correction unit 30 to receive the first correction amount x again, and by choosing unit 20 receiving range parameter D
0, the wherein first correction amount x and distance parameter D
0Can be by user's appointment or by system's automatic setting.Then, 30 foundations of color correction unit, the first correction amount x revises first and revises look C
5(step S103).
On the other hand, choosing 20 of unit can be according to distance parameter D
0With the first correction look C
5Look (step S104) is revised in definition second, wherein second revises the look and the first correction look C
5Between distance be less than or equal to distance parameter D
0In other words, the second correction look is the color that is adjacent to the first correction look, and distance parameter D
0Then be with deciding second to revise the scope that look is contained.In the present embodiment, distance parameter D
0Be that example describes with 3 especially, and second revise the look and the first correction look C
5Distance less than distance parameter D
0Therefore, in the present embodiment, the second correction look then is C
3, C
4, C
6With C
7
Then, in step S105, then revise the look and second distance calculation second correction of revising between the look according to the first correction amount x and above-mentioned mentioned first by color correction unit 30.Present embodiment is an example with following formula (1), so as to calculating second correction of each second correction look, D
iBe each second distance of revising between the look and the first correction look.Though present embodiment is that example describes with following formula (1), the present invention is not limited to this.
30 of color correction unit can be tried to achieve second according to formula (1) and be revised look C
3, C
4, C
6With C
7Second correction be respectively
With
Revise look C by second
3, C
4, C
6With C
7Second correction can find out easily that in the present embodiment, the two or two correction is along with D
iIncrease and reduce, and second correction is along with the first correction amount x increases and increases, but the present invention is not limited to this.
Then by step S106,30 of color correction unit can be revised look C according to second
3, C
4, C
6With C
7Second correction revise second respectively and revise look C
3, C
4, C
6With C
7Color.In addition, because C
1, C
2, C
8, C
9Exceeded distance parameter D
0Scope, therefore, its color then remains unchanged.More cheer and bright for the advantage that makes present embodiment, especially the one dimension schematic diagram with Fig. 3 is an example, and present embodiment and prior art are done a comparison, and with each color correct amount put in order under tabulate one:
Difference between table one present embodiment and the existing correction of respectively revising look
Can know by table one and to find out, originally be implemented in and revise first and revise look C
5Color the time, and revised and be adjacent to first and revise look C
5Color (C
3, C
4, C
6, C
7), and its contiguous color correct amount along with first revise look C
5Distance increase and reduce.Thus, then can avoid revising first and revise look C
5Afterwards, make C
4, C
6Between produce the color breach and cause the problem of false contouring.Review the existing first correction look C that but only revised
5Therefore, be easy to generate the problem of false contouring.
In the foregoing description, tell about embodiment for convenience, though therefore the schematic diagram with the one dimension color space is that example describes, but in other embodiments, those skilled in the art also can be according to the teaching of spirit of the present invention and the foregoing description, embodiments of the invention are applied to the two-dimentional color space or the color correction of three-dimensional color space, then will not give unnecessary details at this.In addition, the embodiments of the invention color correction that not only can be applicable to image also can be applicable to the color correction of video.
It will be appreciated by those skilled in the art that and choose the mode that the first correction look is chosen in unit 30, can change according to user's demand.For instance, choose unit 30 and can choose the first correction look according to the color of a specified pixel.In more detail, choose unit 30 and the color of pixel that cursor clicked in the image can be set at the first correction look, or choose a color of pixel according to an image coordinate and revise look as first.In another embodiment, choose unit 30 and the color of pixel that cursor clicked in the color space can be set at the first correction look, or choose a color of pixel according to the coordinate in a color space and revise look as first.In another embodiment, choose unit 30 and also can choose the first correction look according to a designated color.In more detail, can be according to a color code as designated color, when color code is that #330000 chooses 30 of unit and light red is set at first revises look.
What deserves to be mentioned is, though color correction equipment and method have been depicted a possible kenel in the foregoing description, but those skilled in the art should know, each manufacturer is all different for the design of color correction equipment and method, therefore, application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as revise first when revising look, and revise look and second according to first and revise distance between the look and revised and in color space, be adjacent to the first second correction look of revising look.Be to have met spiritual place of the present invention just.
Fig. 4 is the schematic diagram according to a kind of color correction equipment of the second embodiment of the present invention.Please refer to Fig. 4, in the present embodiment, color correction equipment 11 comprises chooses unit 20, color correction unit 30 and converting unit 40,42.Wherein choose unit 20, color correction unit 30 can then repeat no more at this with reference to the foregoing description.It should be noted that converting unit 40,42, wherein converting unit 40 is coupled to and chooses between unit 20 and the color correction unit 30, and 42 of converting units couple color correction unit 30.When those skilled in the art should know the color correction of carrying out image,, then more be not easy to occur false contouring if the color homogeneity of the color space of each pixel is better in the image.
In the present embodiment, before color correction unit 30 is revised each color, then utilize converting unit 40 that each is revised look earlier and be converted to second color space from first color space, wherein the color homogeneity of second color space is better than the color homogeneity of first color space.After color correction unit 30 had been revised each correction look, converting unit 42 was revised look with each again and is converted to first color space from second color space.More particularly, first color space for example is a rgb color space, and second color space for example is CIE XYZ, Lab, Lch, HSV, YUV or YIQ color space ... or the like.Thus, then be not easy to occur false contouring.
In sum, the present invention is in the correction first correction look, and the distance that foundation first is revised between the look and the second correction look has been revised the second correction look that is adjacent to the first correction look.Therefore, can improve the problem of false contouring.In addition, various embodiments of the present invention have following advantage at least:
1, by the setpoint distance parameter, can determine second to revise the scope that look is contained, therefore can make the colour gamut of desiring to carry out color correction in the color space have more elasticity and change.
2, choose the unit and can choose first according to the color of a specified pixel or a designated color and revise look, make that color correction is easier carries out.
Before revising the color of image, with each color conversion to the preferable color space of color homogeneity.So then be not easy to occur false contouring.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (12)
1. a color correction method is characterized in that, comprising:
Receive one first correction and a distance parameter;
Revise look according to this first correction correction one first;
Define one second and revise look, wherein this second distance of revising look and this first correction look is less than or equal to this distance parameter;
Calculate one second correction according to this first correction and this distance parameter; And
According to this second correction look of this second correction correction;
By setting the scope that this distance parameter decides this second correction look to contain, make the colour gamut of color correction have the elasticity variation.
2. color correction method according to claim 1 is characterized in that, this second correction is along with this reduces apart from increase, and this second correction increases and increases along with this first correction.
3. color correction method according to claim 1 is characterized in that, this second correction is
D
0Be this distance parameter, D
iBe this distance, Δ x is this first correction.
4. color correction method according to claim 1 is characterized in that, also comprises:
Before correction respectively should be revised look, respectively this correction look was converted to one second color space from one first color space; And
Revised respectively after this correction look, respectively this correction look is converted to this first color space from this second color space.
5. color correction method according to claim 1 is characterized in that, also comprises: define this first correction look according to a designated color.
6. color correction method according to claim 1 is characterized in that, also comprises: according to this first correction look of definitions of color of a specified pixel.
7. a color correction equipment is characterized in that, comprising:
One chooses the unit, revises look in order to define one first, and defines one second correction look according to a distance parameter, and this second distance of revising look and this first correction look is less than or equal to this distance parameter; And
One colour correction unit couples this and chooses the unit, and this color correction unit is according to this first correction look of one first correction correction and according to this second correction look of one second correction correction, and this second correction is to be got by this first correction and this distance calculation;
By setting the scope that this distance parameter decides this second correction look to contain, make the colour gamut of color correction have the elasticity variation.
8. color correction equipment according to claim 7 is characterized in that, this second correction is along with this reduces apart from increase, and this second correction increases and increases along with this first correction.
9. color correction equipment according to claim 7 is characterized in that, this second correction is
D
0Be this distance parameter, D
iBe this distance, Δ x is this first correction.
10. color correction equipment according to claim 7 is characterized in that, also comprises:
One first converting unit couples this color correction unit, before this color correction unit correction respectively should be revised look, this first converting unit earlier respectively this correction look be converted to one second color space from one first color space; And
One second converting unit couples this color correction unit, this color correction unit correction is intact respectively should revise look after, this second converting unit respectively this correction look be converted to this first color space from this second color space.
11. color correction equipment according to claim 7 is characterized in that, this is chosen the unit and defines this first correction look according to a designated color.
12. color correction equipment according to claim 7 is characterized in that, this chooses unit this first correction look of definitions of color according to a specified pixel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710138014XA CN101094307B (en) | 2007-08-02 | 2007-08-02 | Color correction method and color correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710138014XA CN101094307B (en) | 2007-08-02 | 2007-08-02 | Color correction method and color correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101094307A CN101094307A (en) | 2007-12-26 |
| CN101094307B true CN101094307B (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710138014XA Expired - Fee Related CN101094307B (en) | 2007-08-02 | 2007-08-02 | Color correction method and color correction device |
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| CN (1) | CN101094307B (en) |
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|---|---|---|---|---|
| CN109270715B (en) * | 2018-11-13 | 2022-07-29 | 成都中电熊猫显示科技有限公司 | Method for correcting white defect in liquid crystal display |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878316A (en) * | 2005-06-10 | 2006-12-13 | 中华映管股份有限公司 | Image color adjusting method |
| CN1968346A (en) * | 2006-11-22 | 2007-05-23 | 友达光电股份有限公司 | Image color correction system and method |
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2007
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878316A (en) * | 2005-06-10 | 2006-12-13 | 中华映管股份有限公司 | Image color adjusting method |
| CN1968346A (en) * | 2006-11-22 | 2007-05-23 | 友达光电股份有限公司 | Image color correction system and method |
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