CN1791229A - Method for adjusting color and processor - Google Patents

Abstract

The invention provides a color regulation method, which comprises: checking color attribute and lightness of a pixel to obtain the color attribute of a first A-type format; if the said color attribute within a special range, converting it into a color attribute of a first B-type format contained a first lightness signal and color signal; regulating the color attribute into one of a second B-type format contained a second lightness signal and color signal; reversing the color attribute of second B-type format into one with a second A-type format as the color attribute of said pixel.

Description

Adjust the method and the processor of color

Technical field

The present invention relates to a kind of method and processor of adjusting color, particularly relate to a kind of color attribute with a pixel, by a first kind form that does not comprise independent luminance signal, be converted to one comprise the second kind form of a luminance signal and a color signal after, method of being adjusted again and processor.

Background technology

In the technology of show image, the color of adjusting pixel (pixel) is unusual important techniques.No matter be because signal transmits in limited transmitting bandwidth, and make its distortion to some extent on color, though or image does not have distortion but must adjust for user's needs or hobby, all needs the color attribute of processed pixels so that display system has preferable performance performance.Not agnate and Different Culture often has cognitions different on the aesthetic feeling, therefore in order to satisfy user and audience, display system is often promoted color representation with ad hoc approach and corresponding device, for example comprises fine setting human body complexion (skinOtonecorrection), strengthens the reinforcement (bluestretch) of greenery patches color (green enhancement) and sky blueness etc.General display system is that employing one comprises the color (being rgb format) that the color attribute form of redness, green and blue three compositions is expressed pixel, yet the attribute of brightness (luminance signal) is dispersed in the middle of R, G, three numerical value of B (representing red, green and blue respectively).Therefore, in known technology, can only adjust a pixel usually in R, G, three chromas (hue) on degree of B and saturation (saturation), and, but can't be handled and adjust in fact influencing the very huge brightness of vision; Make known technology doubly and merit half for the adjustment thing of pixel color.

Summary of the invention

Therefore main purpose of the present invention is to provide one to adjust the method for color and the processor of operating the method, form with the color attribute (color attribute) of a pixel, by a first kind form that does not comprise independent luminance signal, be converted to one comprise the second kind form of a luminance signal and a color signal after, adjust luminance signal and color signal more respectively, to overcome the problem in the above-mentioned known technology.

The present invention discloses a kind of method of adjusting color.This method comprises the color attribute of checking a pixel and brightness and obtains the color attribute of one first first kind form; When the color attribute that is checked through this first first kind form during between a particular range, color attribute with this first first kind form of this pixel, according to the rule of the color attribute of a second kind form, be converted to the color attribute that comprises one first luminance signal (luminance signal) and one first second kind form of one first color signal; The color attribute of this first second kind form is adjusted into a color attribute that comprises the second second kind form of one second luminance signal and one second color signal; And the color attribute of this second second kind form is reversed to the color attribute of one second first kind form, and the color attribute of this second first kind form of changing according to the color attribute of this second second kind form is made as the color attribute of this pixel.

The present invention has also disclosed a kind of processor of adjusting color.This processor comprises an inspection unit, is used for checking whether the color attribute of a pixel and brightness meet a particular range; One converting unit, it is coupled to this inspection unit, and the color attribute of the first first kind form that is used for meeting the pixel of this particular range is converted to the color attribute of the one first second kind form that comprises a luminance signal and a color signal; One adjustment unit, it is coupled to this converting unit, and the color attribute that is used for adjusting this first second kind form is the color attribute of one second second kind form; And an inverse transform unit, it is coupled to this adjustment unit, is used for the color attribute of this second second kind form is converted to the color attribute of a first kind form.

Because the present invention is only according to the color attribute of the first kind form of an object pixel with the color attribute of pixel, adjust luminance signal and color signal more respectively after being converted to the color attribute of a second kind form that comprises a luminance signal and a color signal, therefore making the present invention to adjust effectively influences the very huge luminance signal of visual effect, promotes the usefulness that display system is adjusted color.

Description of drawings

Fig. 1 is the method flow diagram of adjustment color of the present invention.

Fig. 2 is the schematic diagram of first embodiment of the processor of adjustment color of the present invention.

Fig. 3 is the schematic diagram of second embodiment of the processor of adjustment color of the present invention.

The reference numeral explanation

100～150 steps

200,300 processors

210,310 inspection units

220,320 converting units

230,330 adjustment units

240,340 inverse transform unit

Embodiment

Because in the appreciation of human eye for colors of image, brightness (luminanee signal) is one of important element, therefore promptly meet one when being predefined for scope to be adjusted in the present invention in the color attribute of checking a pixel and brightness, the brightness part that is about to this pixel independently captures out, the form of color attribute that also is about to this pixel is by a first kind form that does not include independent luminance signal, be adjusted into the color attribute of a second kind form that includes a luminance signal and a color signal, respectively at needed color effect, adjust the part of luminance signal or the part of color signal again.See also Fig. 1.Fig. 1 is the method flow diagram of adjustment color of the present invention.Wherein, what is called is predefined for specific color range of attributes to be adjusted and can comprises, for example be set at when finely tuning (skin-tonecorrection) attractive in appearance to meet for human body complexion when system system, this predetermined color attribute scope of adjusting is the human body complexion scope; Or be set at when strengthening (green enhancement) for the color of greenery patches (green plants) when system system, this predetermined color attribute scope of adjusting is the green plants Color Range.

Step 100: beginning;

Step 110: check the color attribute of a pixel and brightness and obtain the color attribute of one first first kind form;

Step 120:, the color attribute of this first first kind form of this pixel is converted to the color attribute of the one first second kind form that comprises one first luminance signal and one first color signal when the color attribute that is checked through this first first kind form during between a particular range;

Step 130: the color attribute of this first second kind form is adjusted into a color attribute that comprises the second second kind form of one second luminance signal and one second color signal;

Step 140: the color attribute of this second second kind form is reversed to the color attribute of one second first kind form, and the color attribute of this second first kind form is made as the color attribute of this pixel;

Step 150: finish.

On the implementation, suppose that the color attribute form that display system is adopted originally is a rgb format, then display system can adopt following transition matrix T to carry out computing, be converted to the color attribute (Y represents luminance signal, and U and V are the color signal) of the yuv format that comprises luminance signal and color signal with color attribute with the rgb format that does not comprise independent luminance signal of pixel:

$T=\left[\begin{array}{ccc}a1& a2& a3\\ b1& b2& b3\\ c1& c2& c3\end{array}\right]$

Wherein, a1, a2 are respectively coefficient relevant with the Y signal in R, G and the B signal with a3; B1, b2 are respectively coefficient relevant with the U signal in R, G and the B signal with b3; And c1, c2 are respectively coefficient relevant with the V signal in R, G and the B signal with c3.

Suppose that system of present system is set at the brightness of adjustment carry out to(for) human body complexion.For instance, find the color attribute [R1 of its rgb format when in step 110, checking a pixel, G1, B1] when meeting default human body complexion scope, judge that this pixel is the demonstration human body complexion thereby need be adjusted, the regulation rule of being scheduled in this hypothesis is the lightness that increases human body complexion.Step 120 transfers the color attribute of the rgb format of this pixel to the foregoing color attribute that comprises the yuv format of luminance signal and color signal:

$\left[\begin{array}{c}Y1\\ U1\\ V1\end{array}\right]=T\·\left[\begin{array}{c}R1\\ G1\\ B1\end{array}\right]$

Wherein, Y1 is with the color attribute of the rgb format of pixel [R1, G1, B1] in the brightness luminance signal that partly captures out, U1 and V1 then are the one group color-difference signal (chrominance signals) of color attribute [R1, G1, B1] beyond brightness of rgb format.

Then, step 130 is promptly adjusted the color attribute [Y1, U1, V1] of yuv format according to pre-defined rule, promptly increase the lightness of human body complexion pixel, for example can be made as and directly luminance signal be heightened a predetermined value, and the color attribute of adjusted yuv format is

[Y1′，U1′，V1′]：

[Y1′，U1′，V1′]＝[Y1+ΔY，U1，V1]

Next, step 140 is utilized the inverse matrix T of transition matrix T again ^-1, the color attribute of adjusted yuv format [Y1 ', U1 ', V1 '] is changed back rgb format [R1 ', G1 ', B1 '], and the color attribute of this adjusted rgb format [R1 ', G1 ', B1 '] is made as the color attribute that this is adjusted pixel:

$\left[\begin{array}{c}{R1}^{\′}\\ {G1}^{\′}\\ {B1}^{\′}\end{array}\right]=T^{-1}\·\left[\begin{array}{c}{Y1}^{\′}\\ {U1}^{\′}\\ {V1}^{\′}\end{array}\right]$

Above for method embodiment of the present invention in, adjust yuv format color attribute the visual actual needs of principle and design, for example luminance signal can increase certain value Δ Y as above-mentioned; Or adjust a fixed ratio, for example make Y '=Y * (1+m%).Same, in the part of color-difference signal similar adjustment principle can be arranged also.And except adopting the color attribute of [Y, U, V] form, the present invention also can utilize the color attribute of [Y, Cb, Cr] form, and the corresponding transition matrix of arranging in pairs or groups can realize that the present invention adjusts the method for color.

Method of the present invention also tolerable user is refused this adjustment automatically, promptly after the pre-defined rule that the pixel basis that meets the specific color range of attributes sets is adjusted color attribute, allows the user to send a cancellation signal and recover the color attribute setting originally of this pixel to cancel this adjustment.For instance, when receiving the cancellation signal that the user sends, the color attribute of the rgb format that method of the present invention can be adjusted this [R1 ', G1 ', B1 '] is changed back the color attribute of yuv format again:

$\left[\begin{array}{c}{Y1}^{\′}\\ {U1}^{\′}\\ {V1}^{\′}\end{array}\right]=T\·\left[\begin{array}{c}{R1}^{\′}\\ {G1}^{\′}\\ {B1}^{\′}\end{array}\right];$

According to known adjustment principle (supposing rule as described above), the color attribute of adjusted yuv format is oppositely recalled to original value again for luminance signal being increased a predetermined value:

[Y1″，U1″，V1″]＝[Y1′-ΔY，U1，V1]＝[Y1，U1，V1]；

Promptly can utilize the inverse matrix T ' of transition matrix T this moment, with the color attribute of the yuv format after the reduction [Y1 ", U1 ", V1 "], i.e. [Y1, U1, V1], convert the form of color attribute of rgb format to after, be made as the color attribute of this pixel:

$\left[\begin{array}{c}{R1}^{\′\′}\\ {G1}^{\′\′}\\ {B1}^{\′\′}\end{array}\right]=T^{-1}\·\left[\begin{array}{c}{Y1}^{\′\′}\\ {U1}^{\′\′}\\ {V1}^{\′\′}\end{array}\right]=T^{-1}\·\left[\begin{array}{c}Y1\\ U1\\ V1\end{array}\right]=\left[\begin{array}{c}R1\\ G1\\ B1\end{array}\right];$

The color attribute that so is reducible this pixel is set.

The present invention adjusts the method for color and can be implemented by a processor.See also Fig. 2.Fig. 2 is the schematic diagram of first embodiment 200 of the processor of adjustment color of the present invention.Processor 200 comprises an inspection unit 210; One converting unit 220, it is coupled to inspection unit 210; One adjustment unit 230, it is coupled to converting unit 220; And an inverse transform unit 240, it is coupled to adjustment unit 230.Inspection unit 210 is used for checking the color attribute form that does not contain independent luminance signal of a pixel, is made as the color attribute of a first kind form, whether meets a particular range, i.e. step 110 in execution graph 1 method flow diagram; Converting unit 220 is used for according to a predetermined transformation rule (a for example transition matrix), the format conversion of color attribute that will meet the pixel of this particular range is the form that comprises a color attribute of a luminance signal and a color signal, be made as the color attribute of a second kind form, i.e. step 120 in execution graph 1 method flow diagram.The color attribute that adjustment unit 230 is used for adjusting this first second kind form becomes the color attribute of one second second kind form, i.e. step 130 in execution graph 1 method flow diagram; 240 of inverse transform unit are used for exporting after color attribute with this second second kind form is converted to the color attribute of a corresponding first kind form, are made as the new color attribute of this pixel.

See also Fig. 3.Fig. 3 is the schematic diagram of second embodiment 300 of the processor of adjustment color of the present invention.Processor 300 comprises an inspection unit 310; One converting unit 320, it is coupled to inspection unit 310; One adjustment unit 330, it is coupled to converting unit 320; And an inverse transform unit 340, it is coupled to adjustment unit 330 and converting unit 320.Processor of the present invention 300 among Fig. 3 is adjusted the function except carrying out the color identical with the processor 200 of Fig. 2, in the time of also can after finishing the color adjustment, receiving a cancellation signal again, the color attribute input converting unit 320 of the second first kind form that inverse transform unit 340 is exported reverts back the color attribute of this second first kind form the color attribute of the first first kind form originally.Promptly convert the color attribute of this second first kind form to behind the second kind form (promptly converting the color attribute of the second second kind form to), oppositely adjust back the color attributes of the first second kind form by adjustment unit 330 by converting unit 320; After importing the color attribute of the first second kind form of this reduction into inverse transform unit 340 again, be converted to the color attribute of the first first kind form, i.e. Yuan Ben color attribute.The degree of freedom that like this then the present invention can successfully provide user's one cancellation or the default color of refusal to adjust.

Combine it, the processor that the invention provides a kind of color attribute of adjusting pixel with and method, form with the color attribute of pixel, by a form that does not comprise the color attribute of independent luminance signal, be converted to a form that includes the color attribute of luminance signal and color signal, optionally adjusting the brightness and the color of pixel respectively, improved in the known technology can't be respectively at the brightness of pixel and color and the shortcoming of adjusting has been promoted the performance of display on display color.The present invention also provides concrete enforcement embodiment, and actual judgement and the flow process of adjusting the pixel color attribute have been described.The present invention also provides the user degree of freedom that one cancellation color is adjusted, with avoid pixel that non-institute desire adjusts by rigid adjustment (for example a pixel be human body complexion but only for general body surface but not be positioned at the block that shows human body).Wherein, can manually select or setting by the user about scope, the judgment mode of revising color attribute and the rule of adjusting color attribute; And be applicable to that color correction person of the present invention except the increase of the compensation of human body complexion, the lightness of sky color, also may extend to other any specific demand.

The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims (8)

1. method of adjusting color, it comprises the following step:

Check the color attribute of a pixel and obtain the color attribute of one first first kind form;

When the color attribute that is checked through this first first kind form during,, be converted to the color attribute of the one first second kind form that comprises one first luminance signal and one first color signal with the color attribute of this first first kind form of this pixel between a particular range;

The color attribute of this first second kind form is adjusted into a color attribute that comprises the second second kind form of one second luminance signal and one second color signal; And

The color attribute of this second second kind form is reversed to the color attribute of one second first kind form, and the color attribute of this second first kind form of changing according to the color attribute of this second second kind form is made as the color attribute of this pixel.

2. the method for claim 1, it also comprises the following step:

According to a cancellation signal, the color attribute of this pixel is made as the color attribute of this first first kind form.

3. method as claimed in claim 2, it also comprises the following step:

According to this cancellation signal, this pixel is changed back the color attribute of this second second kind form by the color attribute of this second first kind form;

The color attribute adjustment of this second second kind form is returned the color attribute of this first second kind form; And

Transfer the color attribute of this first second kind form the color attribute of this first first kind form to, and the color attribute of this first first kind form that the color attribute of this first second kind form is changed is made as the color attribute of this pixel.

4. the method for claim 1, wherein this color signal is one group of color-difference signal.

5. the processor that can adjust the color of pixel, it comprises:

One inspection unit is used for checking whether the color attribute of a pixel meets a particular range;

One converting unit, it is coupled to this inspection unit, and the color attribute of first kind form that is used for meeting the pixel of this particular range is converted to the color attribute of the one first second kind form that comprises a luminance signal and a color signal;

One adjustment unit, it is coupled to this converting unit, and the color attribute that is used for adjusting this first second kind form is the color attribute of one second second kind form; And

One inverse transform unit, it is coupled to this adjustment unit, is used for the color attribute of this second second kind form is converted to the color attribute of a first kind form.

6. processor as claimed in claim 5, wherein this adjustment unit is used for adjusting the luminance signal that color attribute comprised and the color signal of this second kind form.

7. processor as claimed in claim 5, wherein this chroma signal is one group of color-difference signal.

8. processor as claimed in claim 5, wherein this converting unit also is used for according to a cancellation signal, and the color attribute of the first kind form that this inverse transform unit is exported is converted to the color attribute of a second kind form; And this adjustment unit also is used for adjusting according to this cancellation signal the color attribute of this second kind form that this converting unit exports.

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