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CN101083775A - Method and device for adjusting image saturation - Google Patents

Method and device for adjusting image saturation Download PDF

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Publication number
CN101083775A
CN101083775A CN 200610084211 CN200610084211A CN101083775A CN 101083775 A CN101083775 A CN 101083775A CN 200610084211 CN200610084211 CN 200610084211 CN 200610084211 A CN200610084211 A CN 200610084211A CN 101083775 A CN101083775 A CN 101083775A
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saturation
component
color space
color
generating
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许凯翔
单益嘉
蔡璨鸿
高旭彬
高旭佳
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Marketech International Corp
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Marketech International Corp
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Abstract

The invention provides a method for adjusting the saturation of a target pixel. In a first color space, the target pixel is represented as a luminance component and a set of color components. The method first generates an original saturation and a hue component according to the set of color components. Then, the method selectively generates an adjustment gain according to the luminance component, the hue component and the original saturation. According to the present invention, a new saturation is generated for the target pixel by multiplying the original saturation by the adjusted gain. After adjusting the saturation of each pixel in an image, the method and apparatus according to the present invention can also further count the adjusted saturation, thereby generating a statistical result as the saturation characteristic of the image.

Description

Adjust the method and the device of image saturation
Technical field
The present invention relates to a kind of method and device of image processing, particularly relate to a kind of method and device of adjusting the saturation of image.
Background technology
Generally speaking, when the user will carry out the adjustment of color aspect to chromatic image, the user must be earlier be converted to the color space of brightness and color separated with image from rgb color space, and for example YUV, YIQ, YCbCr or CIELab handle the component of color again.With CIELab (being called Lab again) color space is example, and all colors all have a coordinate in the Lab color space (b), wherein L is the luminance component of this color for L, a, and a and b then are the color component of this color.If a and b are zero, the white of the then different different brightness of L size expression.If the size of fixed L, then different (a, b) different colours of expression same brightness.As known to persons skilled in the art, the saturation of a color (Saturation) can be represented as (a 2+ b 2) 0.5, when brightness is identical, be positioned at (a, b) light more from the near more color of initial point on the plane, saturation is low more; Otherwise dense more from the color that initial point is far away more, saturation is high more.In addition, the form and aspect of a color (Hue) can be represented as tan -1(b/a), the form and aspect difference is promptly represented the color of different attribute.
As mentioned above, in the color space of brightness and color separated, the saturation S of a color and form and aspect H can be with (a, b) two color components define.In the prior art, the method for adjusting saturation is normally at first utilized color component (a b) is calculated the saturation of each point pixel in the raw video, further adjusts the saturation of this image again according to the statistics and analysis of the saturation of raw video.
In fact, the mankind are also inequality for the susceptibility of various form and aspect.When the saturation of image changed, the beholder had stronger impression to the color that belongs to more sensitive form and aspect, or the color of expecting these form and aspect should have higher saturation.In addition, luminance component L also can influence the judgement of audience to image saturation.When higher or low, the color that human eye can be differentiated is less, and is also lower for the impression of color saturation in brightness.
Therefore,, will not include consideration in, certainly will can't reach the result who makes the audience the most satisfied after adjusting as other factorses such as form and aspect and brightness if the user only considers the saturation of raw video when adjusting the saturation of image.
Summary of the invention
For addressing the above problem, the invention provides a kind of method and device in order to a saturation of adjusting an object pixel.The method according to this invention and device are the saturations of adjusting image simultaneously according to the factors such as saturation, form and aspect and brightness of raw video, but not only consider the saturation of raw video, therefore, the present invention can make adjusted result more meet the consciousness characteristic of human eye.
The present invention's hypothesis is in one first color space, and this object pixel is expressed as a luminance component and one group of color component.A preferred embodiment according to the present invention is an image regulating method.This method at first produces an initial saturation and phase component of the same colour according to this group color component.Then, this method optionally produces one according to this luminance component, this form and aspect component and this initial saturation and adjusts gain.According to the present invention, this initial saturation and this adjustment gain multiplied each other promptly be can be this object pixel and produces a new saturation.
Another preferred embodiment according to the present invention is an image adjusting apparatus.This image adjusting apparatus comprises a computing module, a generation module and a multiplier module.This computing module is in order to produce an initial saturation and phase component of the same colour according to this group color component.This generation module is adjusted gain in order to optionally to produce one according to this luminance component, this form and aspect component and this initial saturation.This multiplier module then is in order to this initial saturation and this adjustment gain are multiplied each other, produce a new saturation for this object pixel by this.
The method according to this invention and device are applicable to the color space as various brightness such as YCbCr, YUV, Lab, HIS, HSV and color-separated.After the saturation of each pixel, the method according to this invention and device also can further be added up described adjusted saturation in adjusting an image, produce the saturation feature of a statistics result as this image by this.
The advantages and spirit of the present invention can be by being further understood below in conjunction with the detailed description of accompanying drawing to invention.
Description of drawings
Fig. 1 is the flow chart according to the image regulating method of first preferred embodiment of the present invention.
Fig. 2 is the flow chart according to the image regulating method of second preferred embodiment of the present invention.
Fig. 3 A and 3B are the calcspars according to the image adjusting apparatus of the 3rd preferred embodiment of the present invention.
Fig. 4 A and 4B are the calcspars according to the image adjusting apparatus of the 4th preferred embodiment of the present invention.
Fig. 5 is the calcspar according to the image adjusting apparatus of the 5th preferred embodiment of the present invention.
The reference numeral explanation
30,40: image adjusting apparatus 31,41,51: computing module
32,42,52: generation module 33,43,53: multiplier module
34,44: look-up table 50: saturation feature generation device
54: statistical module
Embodiment
The invention provides a kind of method and device in order to a saturation of adjusting an object pixel.The present invention at first supposes in one first color space, this object pixel is expressed as a luminance component and one group of color component, wherein this luminance component and this group color component may be to be converted by a rgb color space, and this first color space may be the color space of brightness such as YCbCr, YUV, Lab and color-separated.
First preferred embodiment according to the present invention is an image regulating method.See also Fig. 1, Fig. 1 is the flow chart of this preferred embodiment.
This method is execution in step S11 at first, produces an initial saturation S and phase component H of the same colour according to this group color component.With the Lab color space is example, and all colors all have a luminance component L, one first color component a and one second color component b in the Lab color space.Therefore, step S11 can be by calculating (a 2+ b 2) 0.5Produce this initial saturation S, and by calculating tan -1(b/a) produce this form and aspect component H.
Step S12 optionally produces an adjustment gain G according to this luminance component L, this form and aspect component H and this initial saturation S.In practical application, this adjustment gain optionally according to this luminance component L, this form and aspect component H and this initial saturation S by selecting in the look-up table (look-up table).According to the present invention, which factor the user can will include in the consideration of adjusting saturation according to the demand decision of itself.That is to say that this adjusts gain G can be all relevant with luminance component L, form and aspect component H and these three factors of initial saturation S, also may be only relevant with one of them or two factors.
After finding out the adjustment gain G, step S13 multiplies each other this initial saturation S and this adjustment gain G, produces a new saturation SN for this object pixel by this.
On the other hand, this first color space also may be HSI or HSV color space.In HSI or HSV color space, this object pixel is expressed as an initial saturation S, phase component H of the same colour and a luminance component L.In this case, the method according to this invention can be omitted above-mentioned step S11, directly optionally produces an adjustment gain G according to this initial saturation S, this form and aspect component H and this luminance component L, this initial saturation S and this adjustment gain G is multiplied each other again.
According to second preferred embodiment of the present invention also is an image regulating method.See also Fig. 2, Fig. 2 is the flow chart of this preferred embodiment.The main difference of the second preferable concrete enforcement and first preferred embodiment is form and aspect component H not to be included in the consideration of adjusting saturation.Therefore, step S21 only produces an initial saturation S according to this group color component, does not need to produce form and aspect component H.Step S22 optionally produces an adjustment gain G according to this luminance component L and this initial saturation S.In the present embodiment, this adjusts gain G may be all relevant with luminance component L and these two factors of initial saturation S, also may be only relevant with one of them factor.Step S23 is identical with step S13, all is this initial saturation S and this adjustment gain G are multiplied each other, and produces a new saturation S for this object pixel by this N
The 3rd preferred embodiment according to the present invention is an image adjusting apparatus.See also Fig. 3 (A), Fig. 3 (A) is the calcspar of this preferred embodiment.This image adjusting apparatus 30 comprises a computing module 31, a generation module 32 and a multiplier module 33.Computing module 31 is to produce an initial saturation S and phase component H of the same colour according to this group color component.In the example of Fig. 3, this group color component comprises one first color component a and one second color component b, and this luminance component then is represented as L.Generation module 32 is in order to optionally to produce an adjustment gain G according to this luminance component L, this form and aspect component H and this initial saturation S.33 of multiplier modules are in order to this initial saturation S and this adjustment gain G are multiplied each other, should produce a new saturation S for object pixel by this NIn practical application, generation module 32 may comprise a look-up table 34 shown in Fig. 3 (B).This adjustment gain G optionally according to this luminance component L, this form and aspect component H and this initial saturation S by selecting in this look-up table 34.
According to the 4th preferred embodiment of the present invention also is an image adjusting apparatus.See also Fig. 4 (A), Fig. 4 (A) is the calcspar of this preferred embodiment.This image adjusting apparatus 40 comprises a computing module 41, a generation module 42 and a multiplier module 43.Present embodiment is corresponding to the second above-mentioned preferred embodiment.As shown in Figure 4, this computing module 41 is only in order to produce this initial saturation S.Generation module 42 is in order to optionally to produce an adjustment gain G according to this luminance component L and this initial saturation S.43 of multiplier modules are in order to this initial saturation S and this adjustment gain G are multiplied each other, should produce a new saturation S for object pixel by this NIn practical application, generation module 42 may comprise a look-up table 44 shown in Fig. 4 (B).This adjustment gain G optionally according to this luminance component L and this initial saturation S by selecting in this look-up table 44.
In practical application, after the saturation of each pixel, the method according to this invention and device also can further be added up described adjusted saturation in adjusting an image, produce the saturation feature of a statistics result as this image by this.The 5th preferred embodiment according to the present invention is a kind of device in order to the saturation feature that produces an image.This image comprises M pixel, and wherein M is a positive integer, and each this pixel has a luminance component and one group of color component separately.See also Fig. 5, Fig. 5 is the calcspar of this preferred embodiment.Compared to the image adjusting apparatus 30 of Fig. 3 (A), the saturation feature generation device 50 among Fig. 5 further comprises a statistics module 54.Computing module 51 is respectively each this pixel and produces an initial saturation S and phase component H of the same colour in order to according to this M pixel this group color component separately.Generation module 52, is respectively each this pixel and produces an adjustment gain G according to this M pixel this luminance component L, this form and aspect component H and this initial saturation S separately in order to optionally.Multiplier module 53 produces a new saturation S for each this pixel by this in order to respectively this initial saturation S and this adjustment gain G of each this pixel multiplied each other N54 of statistical modules are in order to add up this new saturation S of this M pixel N, to produce a statistics result this saturation feature as this image.
Though the above embodiments are example with the Lab color space mainly, in fact, the method according to this invention and device are applicable to the color space as various brightness such as YCbCr, YUV, Lab, HSI, HSV and color-separated.Because the method according to this invention and device are adjusted the saturation of image simultaneously according to the factors such as saturation, form and aspect and brightness of raw video, but not only consider the saturation of raw video, therefore, compared to prior art, the present invention can make the consciousness characteristic that more meets human eye through the adjusted result of saturation.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.

Claims (26)

1.一种用以调整一目标像素的一饱和度的方法，在一第一色彩空间中，该目标像素表示为一亮度分量与一组色彩分量，该方法包含下列步骤：1. A method for adjusting a saturation of a target pixel, in a first color space, the target pixel is represented as a brightness component and a set of color components, the method comprising the following steps: (a)根据该组色彩分量产生一原始饱和度和一色相分量；(a) generating an original saturation and a hue component from the set of color components; (b)选择性地根据该亮度分量、该色相分量与该原始饱和度产生一调整增益；以及(b) selectively generating an adjustment gain according to the brightness component, the hue component and the original saturation; and (c)将该原始饱和度与该调整增益相乘，藉此为该目标像素产生一新的饱和度。(c) multiplying the original saturation by the adjustment gain, thereby generating a new saturation for the target pixel. 2.如权利要求1所述的方法，其中该第一色彩空间是一YUV色彩空间、一YIQ色彩空间、一YCbCr色彩空间或一CIELab色彩空间。2. The method of claim 1, wherein the first color space is a YUV color space, a YIQ color space, a YCbCr color space or a CIELab color space. 3.如权利要求1所述的方法，其中该亮度分量与该组色彩分量是由一RGB色彩空间转换而来。3. The method of claim 1, wherein the brightness component and the set of color components are converted from an RGB color space. 4.如权利要求1所述的方法，其中该组色彩分量包含一第一色彩分量(a)与一第二色彩分量(b)，在步骤(a)中，该原始饱和度等于(a2+b2)0.5，并且该色相分量等于tan-1(b/a)。4. The method as claimed in claim 1, wherein the set of color components comprises a first color component (a) and a second color component (b), and in step (a), the original saturation is equal to (a 2 +b 2 ) 0.5 , and the hue component is equal to tan -1 (b/a). 5.如权利要求1所述的方法，其中在步骤(b)中，该调整增益选择性地根据该亮度分量、该色相分量与该原始饱和度由一查找表中选出。5. The method of claim 1, wherein in step (b), the adjustment gain is selectively selected from a look-up table according to the brightness component, the hue component and the original saturation. 6.一种用以调整一目标像素的一饱和度的方法，在一第一色彩空间中，该目标像素表示为一亮度分量与一组色彩分量，该方法包含下列步骤：6. A method for adjusting a saturation of a target pixel represented by a brightness component and a set of color components in a first color space, the method comprising the steps of: (a)根据该组色彩分量产生一原始饱和度；(a) generating an original saturation based on the set of color components; (b)选择性地根据该亮度分量与该原始饱和度产生一调整增益；以及(b) selectively generating an adjustment gain according to the luminance component and the original saturation; and (c)将该原始饱和度与该调整增益相乘，藉此为该目标像素产生一新的饱和度。(c) multiplying the original saturation by the adjustment gain, thereby generating a new saturation for the target pixel. 7.如权利要求6所述的方法，其中该第一色彩空间是一YUV色彩空间、一YIQ色彩空间、一YCbCr色彩空间或一CIELab色彩空间。7. The method of claim 6, wherein the first color space is a YUV color space, a YIQ color space, a YCbCr color space or a CIELab color space. 8.如权利要求6所述的方法，其中该亮度分量与该组色彩分量是由一RGB色彩空间转换而来。8. The method of claim 6, wherein the brightness component and the set of color components are converted from an RGB color space. 9.如权利要求6所述的方法，其中该组色彩分量包含一第一色彩分量(a)与一第二色彩分量(b)，并且在步骤(a)中该原始饱和度等于(a2+b2)0.5。9. The method as claimed in claim 6, wherein the set of color components comprises a first color component (a) and a second color component (b), and in step (a), the original saturation is equal to (a 2 +b 2 ) 0.5 . 10.如权利要求6所述的方法，其中在步骤(b)中，该调整增益选择性地根据该亮度分量与该原始饱和度由一查找表(look-up table)中选出。10. The method of claim 6, wherein in step (b), the adjustment gain is selectively selected from a look-up table according to the brightness component and the original saturation. 11.一种用以产生一影像的一饱和度特征的方法，该影像包含M个像素，M为一正整数，每一个该像素各自具有一亮度分量与一组色彩分量，该方法包含下列步骤：11. A method for generating a saturation feature of an image, the image comprising M pixels, M being a positive integer, each of the pixels having a brightness component and a set of color components, the method comprising the following steps : (a)根据该M个像素各自的该组色彩分量，分别为每一个该像素产生一原始饱和度和一色相分量；(a) generating an original saturation and a hue component for each pixel according to the respective group of color components of the M pixels; (b)选择性地根据该M个像素各自的该亮度分量、该色相分量与该原始饱和度，分别为每一个该像素产生一调整增益；(b) selectively generating an adjustment gain for each of the pixels according to the brightness component, the hue component and the original saturation of the M pixels respectively; (c)分别将每一个该像素的该原始饱和度与该调整增益相乘，藉此为每一个该像素产生一新的饱和度；以及(c) multiplying the original saturation of each of the pixels by the adjustment gain, thereby generating a new saturation of each of the pixels; and (d)统计该M个像素的该新的饱和度，以产生一统计结果作为该影像的该饱和度特征。(d) Statistically counting the new saturations of the M pixels to generate a statistical result as the saturation feature of the image. 12.一种用以调整一目标像素的一饱和度的装置，在一第一色彩空间中，该目标像素表示为一亮度分量与一组色彩分量，该装置包含：12. An apparatus for adjusting a saturation of a target pixel represented by a luminance component and a set of color components in a first color space, the apparatus comprising: 一计算模块，该计算模块用以根据该组色彩分量产生一原始饱和度和一色相分量；a calculation module, the calculation module is used to generate an original saturation and a hue component according to the set of color components; 一产生模块，该产生模块用以选择性地根据该亮度分量、该色相分量与该原始饱和度产生一调整增益；以及a generating module, the generating module is used for selectively generating an adjustment gain according to the brightness component, the hue component and the original saturation; and 一乘法模块，该乘法模块用以将该原始饱和度与该调整增益相乘，藉此为该目标像素产生一新的饱和度。A multiplication module, the multiplication module is used for multiplying the original saturation and the adjustment gain, so as to generate a new saturation for the target pixel. 13.如权利要求12所述的装置，其中该第一色彩空间是一YUV色彩空间、一YIQ色彩空间、一YCbCr色彩空间或一CIELab色彩空间。13. The device of claim 12, wherein the first color space is a YUV color space, a YIQ color space, a YCbCr color space or a CIELab color space. 14.如权利要求12所述的装置，其中该亮度分量与该组色彩分量是由一RGB色彩空间转换而来。14. The device of claim 12, wherein the brightness component and the set of color components are converted from an RGB color space. 15.如权利要求12所述的装置，其中该组色彩分量包含一第一色彩分量(a)与一第二色彩分量(b)，该计算模块是通过计算(a2+b2)0.5产生该原始饱和度，并且是通过计算tan-1(b/a)产生该色相分量。15. The device according to claim 12, wherein the group of color components comprises a first color component (a) and a second color component (b), and the calculation module is generated by calculating (a 2 +b 2 ) 0.5 The original saturation, and the hue component is generated by computing tan -1 (b/a). 16.如权利要求12所述的装置，其中该产生模块包含一查找表，并且该调整增益选择性地根据该亮度分量、该色相分量与该原始饱和度由该查找表中选出。16. The apparatus of claim 12, wherein the generating module comprises a look-up table, and the adjustment gain is selectively selected from the look-up table according to the luma component, the hue component and the original saturation. 17.一种用以调整一目标像素的一饱和度的装置，在一第一色彩空间中，该目标像素表示为一亮度分量与一组色彩分量，该装置包含：17. An apparatus for adjusting a saturation of a target pixel represented by a luminance component and a set of color components in a first color space, the apparatus comprising: 一计算模块，该计算模块用以根据该组色彩分量产生一原始饱和度；a calculation module, the calculation module is used to generate an original saturation according to the set of color components; 一产生模块，该产生模块用以选择性地根据该亮度分量与该原始饱和度产生一调整增益；以及a generating module, the generating module is used for selectively generating an adjustment gain according to the brightness component and the original saturation; and 一乘法模块，该乘法模块用以将该原始饱和度与该调整增益相乘，藉此为该目标像素产生一新的饱和度。A multiplication module, the multiplication module is used for multiplying the original saturation and the adjustment gain, so as to generate a new saturation for the target pixel. 18.如权利要求17所述的装置，其中该第一色彩空间是一YUV色彩空间、一YIQ色彩空间、一YCbCr色彩空间或一CIELab色彩空间。18. The device of claim 17, wherein the first color space is a YUV color space, a YIQ color space, a YCbCr color space or a CIELab color space. 19.如权利要求17所述的装置，其中该亮度分量与该组色彩分量是由一RGB色彩空间转换而来。19. The device of claim 17, wherein the brightness component and the set of color components are converted from an RGB color space. 20.如权利要求17所述的装置，其中该组色彩分量包含一第一色彩分量(a)与一第二色彩分量(b)，并且该计算模块是通过计算(a2+b2)0.5产生该原始饱和度。20. The device according to claim 17, wherein the group of color components comprises a first color component (a) and a second color component (b), and the calculation module is calculated by calculating (a 2 +b 2 ) 0.5 produces this original saturation. 21.如权利要求17所述的装置，其中该产生模块包含一查找表，并且该调整增益选择性地根据该亮度分量与该原始饱和度由该查找表中选出。21. The apparatus of claim 17, wherein the generation module comprises a look-up table, and the adjustment gain is selectively selected from the look-up table according to the luminance component and the original saturation. 22.一种用以产生一影像的一饱和度特征的装置，该影像包含M个像素，M为一正整数，每一个该像素各自具有一亮度分量与一组色彩分量，该装置包含：22. A device for generating a saturation characteristic of an image, the image comprising M pixels, M being a positive integer, each of the pixels having a brightness component and a set of color components, the device comprising: 一计算模块，该计算模块用以根据该M个像素各自的该组色彩分量，分别为每一个该像素产生一原始饱和度和一色相分量；A calculation module, the calculation module is used to generate an original saturation and a hue component for each pixel according to the group of color components of the M pixels respectively; 一产生模块，该产生模块用以选择性地根据该M个像素各自的该亮度分量、该色相分量与该原始饱和度，分别为每一个该像素产生一调整增益；a generation module, the generation module is used to selectively generate an adjustment gain for each pixel according to the brightness component, the hue component and the original saturation of the M pixels respectively; 一乘法模块，该乘法模块用以分别将每一个该像素的该原始饱和度与该调整增益相乘，藉此为每一个该像素产生一新的饱和度；以及a multiplication module for multiplying the original saturation of each of the pixels by the adjustment gain, thereby generating a new saturation for each of the pixels; and 一统计模块，该统计模块用以统计该M个像素的该新的饱和度，以产生一统计结果作为该影像的该饱和度特征。A statistics module, the statistics module is used for statistics of the new saturation of the M pixels, so as to generate a statistics result as the saturation feature of the image. 23.一种用以调整一目标像素的一饱和度的方法，在一第一色彩空间中，该目标像素表示为一原始饱和度、一色相分量和一亮度分量，该方法包含下列步骤：23. A method for adjusting a saturation of a target pixel, in a first color space, the target pixel represented as a raw saturation, a hue component and a lightness component, the method comprising the steps of: (a)选择性地根据该原始饱和度、该色相分量与该亮度分量产生一调整增益；以及(a) selectively generating an adjustment gain according to the original saturation, the hue component and the brightness component; and (b)将该原始饱和度与该调整增益相乘，藉此为该目标像素产生一新的饱和度。(b) multiplying the original saturation by the adjustment gain, thereby generating a new saturation for the target pixel. 24.如权利要求23所述的方法，其中该第一色彩空间是一HSV色彩空间或一HSI色彩空间。24. The method of claim 23, wherein the first color space is an HSV color space or an HSI color space. 25.如权利要求23所述的方法，其中该原始饱和度、该色相分量与该亮度分量是由一RGB色彩空间转换而来。25. The method of claim 23, wherein the original saturation, the hue component and the brightness component are converted from an RGB color space. 26.如权利要求23所述的方法，其中在步骤(a)中，该调整增益选择性地根据该原始饱和度、该色相分量与该亮度分量由一查找表中选出。26. The method of claim 23, wherein in step (a), the adjustment gain is selectively selected from a look-up table according to the original saturation, the hue component and the brightness component.
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