CN101729913B - Method and system for adjusting image saturation - Google Patents
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Abstract
The invention relates to a method and a system for adjusting the saturation of an image which comprises a plurality of pixels. The method comprises the following steps: providing an external adjustment coefficient, directly calculating the approximate value of the saturation of each pixel according to three primary color (RGB) component of each pixel, obtaining the adjustment quantity of the saturation of each pixel and adjusting each pixel of the image according to the adjustment quantity of the saturation and the RGB component of each pixel, wherein the adjustment quantity of the saturation of each pixel corresponds to the external adjustment coefficient and the approximate value of the saturation of each pixel. Therefore, different saturation adjustment actions onto the image can be performed according to the color of each pixel of the image, and the image which has better color and can not distort can be generated accordingly.
Description
Technical field
The invention relates to a kind of method of adjustment and system of image, and particularly relevant for a kind of method and system of adjusting the saturation of image.
Background technology
In image processing technique, the adjustment of saturation (saturation) and brightness (illumination) most likely causes the most directly influence for the color representation of image.In general, can be on the display chip real adjustment circuit that make color of the manufacturer of display, and then let the user can adjust the saturation or the brightness of image frame according to custom or demand, obtain best output effect according to this.
In traditional image saturation method of adjustment; Under the prerequisite of the overall brightness that keeps picture; If hope to improve the bright-coloured degree of image, at first must carry out the switching motion of color space to image, convert three primary colors (RGB) signal of each pixel into color-difference signal (yuv signal for example according to this; Wherein Y representes brightness, and U, V then are color informations).Then each U, V signal are multiplied by identical adjustment parameter to obtain new U value and V value.Again adjusted yuv signal is changed back the RGB signal at last, accomplish the adjustment action of the saturation of image according to this.
Be to come in all the pixel places in the image in such practice with identical adjustment parameter.Yet what be not difficult to infer is, when processing itself just has the pixel than high saturation (promptly comparatively bright-coloured), is multiplied by the adjustment parameter and makes this pixel become too saturated probably.Therefore when whole image processed; If come each pixel is adjusted with identical adjustment parameter fully; The pixel that then makes part belong to high saturation possibly and only have the nuance supersaturation that all becomes; Thereby the details in the forfeiture image, and possibly cause the image colour purity too strong, and cause factitious color effect.
See through saturation that said method increases image except the forfeiture that possibly cause details, on real work of circuit, also seem quite complicated.No matter be the switching motion of color space, or the saturation computation of under the YUV color space, being carried out action, the mathematical computations that all must be dependent on large amount of complex, this not only is unfavorable for the realization of circuit, must expend more hardware cost simultaneously.These subjects under discussion that all to be display manufacturer when research and development can not ignore.
Summary of the invention
The method of adjustment that the purpose of this invention is to provide a kind of image saturation is able to the switching motion without any color space, just can accomplish the adjustment of image saturation.
Another object of the present invention provides a kind of Adjustment System of image saturation, can carry out different saturation adjustment actions accordingly according to the color condition of each pixel in the image itself, and then guarantee the adjustment effect of image saturation.
For reaching above-mentioned or other purpose, the present invention proposes a kind of method of adjustment of image saturation, and in order to the saturation of adjustment image, wherein this image comprises a plurality of pixels.This method at first provides outside adjustment coefficient, and according to three primary colors (RGB) component of each pixel, directly calculates the saturation approximation of each pixel.Next, obtain the saturation adjustment amount of each pixel.Wherein, the saturation adjustment amount is the size corresponding to the saturation approximation of outside adjustment coefficient and each pixel.At last, according to saturation adjustment amount and RGB component, adjust each pixel in the image accordingly.
In one embodiment of this invention, directly calculate the step of the saturation approximation of pixel, comprise according to maximum in the RGB component and minimum value and calculate the saturation approximation according to the RGB component of pixel.
In one embodiment of this invention, wherein before the step of the saturation adjustment amount of obtaining each pixel, more comprise the first saturation critical value and the second saturation critical value are provided.Wherein, the first saturation critical value is less than the second saturation critical value.Then, relatively the size of the first saturation critical value, the second saturation critical value and saturation approximation judges that according to this saturation approximation system belongs to high saturation scope, middle saturation scope, or the low saturation scope.
In one embodiment of this invention, the step that wherein obtains the saturation adjustment amount of pixel is included in the saturation approximation when belonging to high saturation scope or low saturation scope, makes the saturation adjustment amount be preset adjustment constant.Yet during the saturation scope, according to the first saturation critical value, the second saturation critical value, saturation approximation, and outside adjustment coefficient calculates the saturation adjustment amount in the saturation approximation belongs to.
In one embodiment of this invention; Judge that saturation approximation system belongs to high saturation scope, middle saturation scope; Or the step of low saturation scope judges that the saturation approximation belongs to the low saturation scope when being included in the saturation approximation less than the first saturation critical value.And when the saturation approximation is between the first saturation critical value and the second saturation critical value, judge that the saturation approximation belongs to middle saturation scope.And during greater than the second saturation critical value, judge that saturation approximation system belongs to the high saturation scope in the saturation approximation.
In one embodiment of this invention, outside adjustment coefficient comprises the numerical value between 0 to 2.
From another viewpoint, the present invention proposes a kind of Adjustment System of image saturation.This system comprises adjusting range decision-making module and saturation adjusting module.Wherein, the adjusting range decision-making module comprises that saturation approximation calculation module and saturation adjustment amount obtain module, in order to receive image and outside adjustment coefficient.Wherein, the image that is received comprises a plurality of pixels.Saturation approximation calculation module is in order to the RGB component according to each pixel, directly calculates the saturation approximation of each pixel; It then is to be connected to saturation approximation calculation module that the saturation adjustment amount is obtained module, in order to adjust the size of the saturation approximation of coefficient and pixel according to the outside, obtains the saturation adjustment amount of each pixel respectively.The saturation adjusting module system that links to each other with the adjusting range decision-making module adjusts each pixel in the image accordingly in order to according to saturation adjustment amount and RGB component.
In one embodiment of this invention, wherein saturation approximation calculation module is calculated the saturation approximation of pairing pixel in order to according to maximum in the RGB component and minimum value.
In one embodiment of this invention, wherein the saturation adjustment amount is obtained module in order to the first saturation critical value and the second saturation critical value to be provided.Wherein, the first saturation critical value is less than the second saturation critical value.The module that obtains the saturation adjustment amount will compare the size of the first saturation critical value, the second saturation critical value and saturation approximation, judge that according to this saturation approximation system belongs to high saturation scope, middle saturation scope, or the low saturation scope.
In one embodiment of this invention, wherein the saturation adjustment amount is obtained module when belonging to high saturation scope or low saturation scope in the saturation approximation, makes the saturation adjustment amount be preset adjustment constant.And in the saturation approximation belongs to during the saturation scope, according to the first saturation critical value, the second saturation critical value, saturation approximation, and outside adjustment coefficient calculates the saturation adjustment amount.
In one embodiment of this invention, wherein the saturation adjustment amount is obtained module in order to during less than the first saturation critical value, to judge that the saturation approximation belongs to the low saturation scope in the saturation approximation; And when the saturation approximation is between the first saturation critical value and the second saturation critical value, judge that the saturation approximation belongs to middle saturation scope; And during greater than the second saturation critical value, judge that the saturation approximation belongs to the high saturation scope in the saturation approximation.
In one embodiment of this invention, outside adjustment coefficient comprises the numerical value between 0 to 2.
The present invention directly calculates the saturation approximation according to the RGB component of each pixel in the image itself, and judges whether to carry out the adjustment of saturation to this pixel under rgb color space, and obtains corresponding saturation adjusting range.Following in the situation of not coming whole image adjusted with fixing adjustment parameter can be guaranteed that the details of image can not disappear because of the adjustment action of saturation, and then guarantee the color representation of whole image.
For let above and other objects of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
Fig. 1 is the calcspar according to the Adjustment System of the image saturation that one embodiment of the invention illustrated;
Fig. 2 is the flow chart according to the method for adjustment of the image saturation that one embodiment of the invention illustrated;
Fig. 3 reduces to when minimum the numerical value change amount of saturation and saturation approximation according to red saturation scale that one embodiment of the invention illustrated by the highest;
Fig. 4 A reduces to when minimum the change curve of saturation according to red saturation scale that one embodiment of the invention illustrated by the highest;
Fig. 4 B reduces to when minimum the change curve of saturation approximation according to red saturation scale that one embodiment of the invention illustrated by the highest;
Fig. 5 is according to the saturation adjustment amount that one embodiment of the invention illustrated and the corresponding relation of saturation approximation.
Embodiment
In general, the RGB signal that belongs to three primary colors (RGB) color space by the signal that drive circuit the produced system of display pannel (panel).Therefore, when the saturation of adjustment image, need not carry out the conversion of color space, certainly will be able to reduce the real needed hardware circuit cost in conversioning colour space of doing if can directly under rgb color space, adjust.The present invention is based on above-mentioned viewpoint and then develops the method for adjustment and the system of a kind of image saturation that.In order to make content of the present invention more clear, below specially lift the example that embodiment can implement as the present invention really according to this.
Fig. 1 is the calcspar according to the Adjustment System of the image saturation that one embodiment of the invention illustrated.See also Fig. 1, the Adjustment System 100 of image saturation can be carried out corresponding saturation adjustment action according to the bright-coloured degree of each pixel in the image that is received.In the present embodiment, the Adjustment System 100 of image saturation comprises adjusting range decision-making module 110 and saturation adjusting module 120.
Wherein, Adjusting range decision-making module 110 can see through inner saturation approximation calculation module 111 and obtain module 113 with the saturation adjustment amount; With RGB component according to each pixel in received outside adjustment coefficient and the image; Directly under rgb color space, calculate the saturation approximation of each pixel, and obtain corresponding saturation adjustment amount according to the saturation approximation.And the saturation adjusting module 120 that links to each other with adjusting range decision-making module 110 then is to carry out saturation adjustment action to each pixel respectively according to the saturation adjustment amount of each pixel.
For the operation workflow of Adjustment System 100 of the explanation image saturation in a nearlyer step, below special another embodiment of act come that the present invention will be described in more detail.Fig. 2 is the flow chart according to the method for adjustment of the image saturation that one embodiment of the invention illustrated.Please consult Fig. 1 and Fig. 2 simultaneously, before adjusting, at first shown in step 210, an outside adjustment coefficient is provided by 100 pairs of received images of Adjustment System of image saturation.In the present embodiment, outside adjustment coefficient for example is the numerical value between 0 to 2.The outside adjustment coefficient that the user can vary in size according to the hobby input of itself.For instance, if the user gets used to comparatively bright-coloured display effect, outside that then can numerical value is higher adjustment coefficient (for example 1.5) inputs to adjusting range decision-making module 110; If yet the user does not hope that picture is too bright-coloured, outside that can numerical value is less adjustment coefficient (for example 1.2) inputs to adjusting range decision-making module 110.
Then in step 220, saturation approximation calculation module 111 will directly calculate the saturation approximation of each pixel according to the RGB component of each pixel in the image.In the present embodiment, saturation approximation calculation module 111 is a saturation approximation of utilizing maximum and minimum value in the RGB component to come calculating pixel.For instance, if the RGB component of a pixel be (R, G B), for example are to calculate the saturation approximation with formula so in the present embodiment:
The saturation approximation=[MAX (R, G, B)-MIN (R, G, B)]/N
Wherein, (R, G B) are maximum in the RGB component to MAX, and (R, G B) then represent minimum value in the RGB component to MIN.N then is in order to quantize the quantization parameter (N for example is 2 power power) of saturation approximation.In one embodiment, if represent each pixel in the image with 8 positions, when N was 1, the scope of saturation approximation was between 0 to 255 (that is need represent a saturation approximation with 8 positions) so.And when N was 2, therefore the scope of saturation approximation then can only need 7 positions just can represent the saturation approximation of each pixel between 0 to 127.5.Explanation suppose all that in following embodiment N is 2, so the saturation approximation of each pixel is the numerical value between 0 to 127.5 in the image for ease.
Form shown in Figure 3 is that the record red saturation scale is reduced to when minimum the numerical value change of pairing saturation and saturation approximation by the highest.Wherein, R, G, B field are represented redness, green and the blue component of a pixel respectively; Y, I, Q field then are to be recorded in the American National specification committee (National Television System Committee is NTSC) under the specification, respectively in order to the information of expression brightness and color.See also Fig. 3; Saturation field recorded data ties up under the YIQ color space, sees through the pixel intensity that formula
is calculated.Saturation approximation field recorded data then is the numerical value that is directly calculated according to the maximum in the RGB component of pixel and minimum value by saturation approximation calculation module 111.
See also second horizontally-arranged of Fig. 3, when the RGB of pixel component is (255,0,0), represent that this pixel has only redness and do not have other color.That is to say that its RGB component was (255,0,0) when red saturation scale was maximum concerning display pannel.Behind the process color space switching motion of RGB to YIQ; Its corresponding saturation is 162.1005938 (i.e.
); The saturation approximation of directly utilizing the RGB component to be calculated by saturation approximation calculation module 111 then is 127.5 (i.e. [MAX (255,0,0)-MIN (255; 0,0)]/2).
Along with the minimizing of red component and the increase of green and blue component, red saturation also can descend step by step.Shown in last horizontally-arranged among Fig. 3, when the RGB of pixel component by (255,0; When 0) changing to (128,127,127); Represent this pixel completely near white, as shown in Figure 3, the pairing saturation of this pixel and saturation approximation all were reduced to and leveled off to 0 numerical value this moment.
Fig. 4 A is the curve chart of the corresponding relation of the various RGB components drawn according to the content of Fig. 3 and saturation, and Fig. 4 B then is the curve chart of the corresponding relation of RGB component and saturation approximation.Simultaneously comparison diagram 4A and Fig. 4 B just can find, curve 410 and curve 420 only have difference slightly on the position of starting point and slope, be decremented to 0 skew lines gradually but all belong to.Therefore can infer,, should positively reflect the variable quantity of the saturation of pixel by the saturation approximation that saturation approximation calculation module 111 is calculated.
And it must be emphasized that at this saturation approximation calculation module 111 is directly under rgb color space, to carry out the calculating action of saturation, and need not pass through any color space conversion program.In other words, saturation approximation calculation module 111 needed operands will be much smaller than traditional saturation computation method.Under the comparatively simple prerequisite of required circuit, present embodiment can reach the purpose that reduces circuit cost.
Calculate the saturation approximation of each pixel in saturation approximation calculation module 111 after; Shown in step 230; The saturation adjustment amount is obtained the size that module 113 can be adjusted coefficient and saturation approximation according to the outside that the user provided, and calculates the saturation adjustment amount of each pixel.That is to say that the saturation adjustment amount is obtained the size of module 113 meetings according to the saturation approximation of each pixel, gives optimal saturation adjustment amount accordingly.
For instance, when the saturation approximation of pixel itself is too high, for fear of adjusted pixel become too saturated, so the Adjustment System 100 of image saturation will can not carried out the adjustment of saturation to this pixel.In addition; Because the low excessively pixel of saturation approximation is adjusted; May cause negative effect to the brightness of image, therefore for fear of the generation of above-mentioned situation, the Adjustment System 100 of image saturation can not adjusted action to the low excessively pixel of saturation approximation equally.Have only when the saturation approximation of pixel belongs to median, the Adjustment System 100 of image saturation just can come the saturation of pixel is carried out corresponding adjustment according to the bright-coloured degree of pixel itself.
Therefore in the present embodiment, the saturation adjustment amount is obtained module 113 at first will provide the first saturation critical value and the second saturation critical value (the first saturation critical value is less than the second saturation critical value).Then the size to the saturation approximation of the first saturation critical value, the second saturation critical value and each pixel compares.During less than the first saturation critical value, judge that its saturation approximation belongs to the low saturation scope in the saturation approximation of a pixel.And when the saturation approximation is between the first saturation critical value and the second saturation critical value, judge that saturation approximation system belongs to middle saturation scope.And during greater than the second saturation critical value, judge that the saturation approximation is to belong to the high saturation scope in the saturation approximation.
Continuity the foregoing description; The numerical value of scope system between 0 to 127.5 of the saturation approximation of being calculated by saturation approximation calculation module 111; In the present embodiment, the first saturation critical value and the second saturation critical value for example can be 12.75 and 114.75.That is to say; Belonging to preceding 10% pixel (being the pixel of saturation approximation between 114.75 to 127.5) will be sorted out to the high saturation scope in the saturation approximation; The pixel (being the pixel of saturation approximation between 0 to 12.75) that belongs to back 10% then belongs to the low saturation scope, and remaining pixel then belongs to middle saturation scope.Though be with 12.75 and 114.75 examples in the present embodiment, not in order to limit scope of the present invention as the first saturation critical value and the second saturation critical value.
When the saturation approximation of pixel belongs to high saturation scope or low saturation scope, the saturation adjustment amount is obtained module 113 will give the saturation adjustment amount that one of this pixel meets preset adjustment constant (for example 1).And in the saturation approximation of pixel belongs to during the saturation scope; The saturation adjustment amount is obtained module 113 meetings according to the first saturation critical value, the second saturation critical value, saturation approximation, and outside adjustment coefficient comes the saturation adjustment amount of calculating pixel.
In one embodiment, to obtain module 113 be to calculate the saturation adjustment amount Km of a pixel with formula to the saturation adjustment amount:
Wherein, the saturation approximation of D remarked pixel, and K is outside adjustment coefficient.ST
1With ST
2Be respectively the first saturation critical value and the second saturation critical value, and ST
CThen be ST
1With ST
2Median.Fig. 5 is under 1.25,1.35,1.5 these three kinds of different external adjustment coefficients, is calculated the corresponding relation curve between saturation adjustment amount and the saturation approximation with above-mentioned formula.
Can find by Fig. 5, the maximum of the big I decision saturation adjustment amount of outside adjustment coefficient, and can impact above-mentioned corresponding relation slope of a curve.In middle saturation scope, have only the saturation approximation to belong to median ST
CPixel, its saturation adjustment amount can equal the outside adjustment coefficient that the user provides, the saturation adjustment amount of rest of pixels then can present linear attenuation.And because the Adjustment System 100 of image saturation can not carried out any saturation adjustment action to the pixel that belongs in high saturation scope and the low saturation scope, so the saturation adjustment amount is obtained module 113 and will be given the saturation adjustment amount that one of these pixel belong to preset adjustment constant (for example 1).
What deserves to be mentioned is that in another embodiment, the corresponding relation of saturation adjustment amount and saturation approximation can be done through the mode of tabling look-up in fact.That is to say, set up many group look-up tables (look-up table) in advance, wherein each look-up table is recorded under the various outside adjustment coefficient, the pairing saturation adjustment amount of saturation approximation.After obtaining the outside adjustment coefficient that the user imports and calculating the saturation approximation of pixel, just can see through the mode of tabling look-up directly obtain pixel in the look-up table corresponding to outside adjustment coefficient saturation adjustment amount.
At last, shown in step 240, the saturation adjustment amount and the RGB component of each pixel that saturation adjusting module 120 will be transmitted according to adjusting range decision-making module 110 are adjusted each pixel in the image accordingly.In the present embodiment, the circuit of any saturation adjustment is done the saturation adjustment action that mode all can be used to carry out pixel in fact, does not limit its scope at this.And when the saturation adjustment amount of a pixel is adjusted constant for presetting, saturation adjusting module 120 will can not carry out the adjustment action of saturation to this pixel, and then keep the saturation dimension of pixel itself.
In sum; The method of adjustment of image saturation of the present invention and system tie up under the rgb color space saturation approximation of directly calculating each pixel, and according to the size of the saturation approximation of each pixel; Give optimal saturation adjustment amount; And when the saturation approximation is too high or too low, keep the saturation of pixel itself, can avoid producing the image of details disappearance or distortion thus.In addition, the calculating of under rgb color space, carrying out saturation also can reduce the mathematical operation amount significantly, and then saves the real cost of doing of hardware of saturation adjustment circuit.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limit the present invention; Anyly have the knack of this art; Do not breaking away from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (6)
1. the method for adjustment of an image saturation, in order to adjust the saturation of an image, wherein this image comprises a plurality of pixels, it is characterized in that, this method comprises:
One outside adjustment coefficient is provided;
According to a three primary color components of each those pixel, calculate a saturation approximation of this pixel respectively, wherein calculate this saturation approximation according to a maximum in this three primary color components and a minimum value;
One first saturation critical value and one second saturation critical value are provided, and wherein this first saturation critical value is less than this second saturation critical value;
Relatively the size of this first saturation critical value, this second saturation critical value and this saturation approximation belongs to saturation scope in the high saturation scope, to judge this saturation approximation system, or a low saturation scope;
Obtain a saturation adjustment amount of each those pixel, wherein, when this saturation approximation belongs to this high saturation scope or this low saturation scope, make that this saturation adjustment amount is a preset adjustment constant; When this saturation approximation belongs in this saturation scope, according to this first saturation critical value, this second saturation critical value, this saturation approximation, and should this saturation adjustment amount of outside adjustment coefficient calculations; And
According to those saturation adjustment amounts and those three primary color components, each those pixel in corresponding this image of adjustment.
2. the method for adjustment of image saturation as claimed in claim 1; It is characterized in that; The size of this first saturation critical value, this second saturation critical value and this saturation approximation relatively wherein; Judging that this saturation approximation system belongs to this high saturation scope, saturation scope in this, or the step of this low saturation scope comprises:
During less than this first saturation critical value, judge that this saturation approximation belongs to this low saturation scope in this saturation approximation;
When this saturation approximation is between this first saturation critical value and this second saturation critical value, judge that this saturation approximation belongs to saturation scope in this; And
During greater than this second saturation critical value, judge that this saturation approximation belongs to this high saturation scope in this saturation approximation.
3. the method for adjustment of image saturation as claimed in claim 1 is characterized in that, wherein should comprise the numerical value between 0 to 2 by outside adjustment coefficient.
4. the Adjustment System of an image saturation is characterized in that, comprising:
One adjusting range decision-making module, in order to receive an image and an outside adjustment coefficient, wherein this image comprises a plurality of pixels, this adjusting range decision-making module comprises:
One saturation approximation calculation module in order to the three primary color components according to each those pixel, is calculated a saturation approximation of each those pixel respectively, wherein calculates this saturation approximation according to a maximum in this three primary color components and a minimum value;
One saturation adjustment amount is obtained module; Be coupled to this saturation approximation calculation module; In order to obtain a saturation adjustment amount of each those pixel; Also in order to one first saturation critical value and one second saturation critical value to be provided, wherein this first saturation critical value is less than this second saturation critical value, and the size of this first saturation critical value, this second saturation critical value and this saturation approximation relatively; Judging that this saturation approximation system belongs to saturation scope in the high saturation scope,, or a low saturation scope; When this saturation approximation belongs to this high saturation scope or this low saturation scope; Make that this saturation adjustment amount is a preset adjustment constant; When this saturation approximation belongs in this saturation scope; According to this first saturation critical value, this second saturation critical value, this saturation approximation, and should adjust this saturation adjustment amount of coefficient calculations in the outside; And
One saturation adjusting module is coupled to this adjusting range decision-making module, in order to according to those saturation adjustment amounts and those three primary color components, and each those pixel in corresponding this image of adjustment.
5. the Adjustment System of image saturation as claimed in claim 4; It is characterized in that; Wherein this saturation adjustment amount is obtained module in order in this saturation approximation during less than this first saturation critical value; Judge that this saturation approximation belongs to this low saturation scope, when this saturation approximation is between this first saturation critical value and this second saturation critical value, judge that this saturation approximation belongs to saturation scope in this; And during greater than this second saturation critical value, judge that this saturation approximation belongs to this high saturation scope in this saturation approximation.
6. the Adjustment System of image saturation as claimed in claim 4 is characterized in that, wherein should comprise the numerical value between 0 to 2 by outside adjustment coefficient.
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