CN101459855A - Color video quality regulation system and method - Google Patents
Color video quality regulation system and method Download PDFInfo
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Abstract
The invention relates to a system and a method for adjusting the quality of colorful images, after the system transforms a colorful video signal source into a component chromaticity signal which comprises a brightness signal and a chromaticity signal, a signal coordinate axis rotating unit carries out the signal coordinate transformation to the chromaticity signal according to the color hue correcting parameter, then a multiplier multiplies the chromaticity signal which is transformed through the coordinate with the saturation correcting parameter, and obtains an output chromaticity signal. And the output chromaticity signal and the brightness signal form the component chromaticity signal and is sent off through a chromaticity signal reverse transformation unit. Compared with the traditional chromaticity signal processing technique, the method can realizes the aim of the transformation between separate color and color gamut without using a complex color space for transformation. The method utilizes a shielding area to overlap to generate a mapping corresponding table, which does not need the complex calculation and saves the memory space for recording the corresponding table, can simultaneously integrate the integrated area and the separated adjustment without an extra circuit, and can simultaneously realize the adjustment of the brightness, the saturation and the color hue separated area.
Description
Technical field
The present invention is relevant for a kind of treatment technology of chromatic image, particularly about a kind of color video quality regulation system and method.
Background technology
Along with the fast development of video technique, the kind of video interface is also more and more.In the widely used colour-video signal specification of present institute, the analog video signal of main flow has composite video (Composite), S-video (S-video), VGA port RGB, and component signal (Component).
The color that chromatic image presented is the key factor that image information presents.Color has three basic attributes: form and aspect, brightness, saturation, the wherein difference between form and aspect (Hue) the expression colour system.The bright-dark degree of brightness (Brightness) expression color.Saturation (Saturation) is represented the purity of color, also can be described as the chroma of color.Colour-video signal has comprised R, G, B tricolor signal.When the data of a large amount of colour signals transmitted, the technology that can see through coding, decoding was usually carried out the processing of signal of video signal.
In present audio-visual design the aberration video terminal generally used be vision signal to be separated into 3 different signal components (Component) carry out the transmission of signal data.The brightness (being brightness signal Y) that these 3 signals are respectively the chromatic image signals, and from tricolor signal two kinds, blue and redness (being chroma signals Pb, Pr).
Formerly in the patented technology, there is the various technology of employing to carry out the processing of signal of video signal.For example in No. the 200726272nd, Republic of China's patent of invention publication number, expose method and device that a kind of display color is adjusted, it mainly is the video signal format that the colour-video signal source R in signal of video signal source, G, B is converted to Y, U, V-type attitude earlier through a color change-over circuit, with phase transformation circuit of the same colour Y, U, V signal of video signal is converted to the video signal format of Y, C, H kenel again.Afterwards, cooperate a facial difference correspondence table of the same colour and a saturated coupling correspondence table, contrary form and aspect conversion, contrary color conversion to produce output image signal.The processing of whole colour signal needs complicated color space conversion hardware circuit.
Again for example in U.S.'s patent of invention case 20040021671A1 patent case, it exposes a kind of color space conversion circuit that can regulate to the saturation of signal of video signal, brightness, to form and aspect when.This previous patent case, though can reach quite complete color video quality regulatory function, the entire circuit design department is that the basis is designed based on hardware, so entire circuit is quite complicated.
For example in U.S.'s patent of invention publication number 20070086030A1 patent case, it exposes a kind of change-over circuit and method of chromatic image signal again.In this previous patent case, the entire process circuit needs complicated matrix operation, and the number of regions that can independently adjust is restricted, and can't integrate whole district's adjustment mechanism of brightness, saturation and form and aspect.
Again for example in No. 6552751 patent case of U.S.'s patent of invention case, the treatment circuit that it exposes a kind of signal of video signal is used for adjusting brightness, contrast, form and aspect of a chromatic image signal etc.The signal of video signal of input is handled by a signal processing circuit after can converting brightness and chroma signals to by first matrix circuit earlier again, changes back signal of video signal by second matrix circuit again.In this previous patent case, the entire process circuit also needs complicated matrix operation and conversion.
Again for example in No. 4679072 patent case of U.S.'s patent of invention case, it exposes the device that a kind of signal of video signal is regulated, it mainly is the adjusting of carrying out signal of video signal with the rotation of reference axis, though have easy circuit framework, but the regulatory function of the colour signal quality that can reach is limited, does not meet the actual demand of modern image documentation equipment.
By traditional technical Analysis it, still there has been color space conversion program complexity in different technology, can't reach individual color and color gamut conversion, need the complex mathematical computing, need bigger correspondence table memory space, need the additional complexity circuit could integrate the whole district and isolated area adjustment simultaneously ... wait disappearance separately.
Summary of the invention
Main purpose of the present invention provides a kind of color video quality regulation system and method, in order to the colour-video signal source is converted to the component chroma signals that includes an output luminance signal and output chroma signals.
Another object of the present invention provide a kind of need not be complicated the color space conversion can reach the color video quality regulation system and the method for individual color and color gamut conversion.
The technological means that the present invention deals with problems:
The present invention is converted to the component chroma signals that includes a luminance signal and chroma signals for solving the technological means system that prior art problems adopted with colour-video signal source RGB, again this component chroma signals is carried out Coordinate Conversion with chroma signals according to a form and aspect correction parameter through form and aspect and saturation conversion adjustment unit, again according to this saturation correction parameter after a multiplier carries out multiplying each other of signal, and produce the output chroma signals.
In the preferred embodiment of the present invention, form and aspect correction parameter and saturation correction parameter are cooperated the aberration of reflection formula and saturation correspondence table and are obtained a form and aspect correction parameter, a saturation correction parameter by a correction parameter generation unit.
In the preferred embodiment of the present invention, also can include a brightness transition adjustment unit, it receives the chroma signals that this chrominance signal converting unit is produced, and with this chroma signals according to a brightness correction parameter after an adder addition, produce an output luminance signal.Also can include an image contrast regulon in this brightness transition adjustment unit, further make image contrast with the output luminance signal that this brightness transition adjustment unit is produced and regulate, export this output luminance signal again.
The invention provides a kind of color video quality regulation system, this system comprises: color signal converting unit of the same colour is converted to the component chroma signals that includes a luminance signal and chroma signals in order to the colour-video signal source with an input; One correction parameter generation unit, it contrasts an aberration and saturation mapping correspondence table and obtains a form and aspect correction parameter and a saturation correction parameter according to the described hue value that obtains by calculating in the described colour-video signal source after the hue value in described colour-video signal source; One form and aspect and saturation conversion adjustment unit, it receives the chroma signals that described chrominance signal converting unit is produced, and described chroma signals carried out Coordinate Conversion according to described form and aspect correction parameter, the described saturation correction parameter of foundation is exported chroma signals and produce after a multiplier carries out multiplying each other of signal again.
The present invention also provides a kind of color video quality regulation system, and this system comprises: color signal converting unit of the same colour is converted to the component chroma signals that includes a luminance signal and chroma signals in order to the colour-video signal source with an input; One correction parameter generation unit, it contrasts an aberration and saturation and brightness mapping correspondence table and obtains a form and aspect correction parameter, a saturation correction parameter and a brightness correction parameter according to the described hue value that obtains by calculating in the described colour-video signal source after the hue value in described colour-video signal source; One form and aspect and saturation conversion adjustment unit, it receives the chroma signals that described chrominance signal converting unit is produced, and described chroma signals carried out Coordinate Conversion according to described form and aspect correction parameter, the described saturation correction parameter of foundation is exported chroma signals and produce after a multiplier carries out multiplying each other of signal again; One brightness transition adjustment unit, it receives the chroma signals that described chrominance signal converting unit is produced, and with described chroma signals according to described brightness correction parameter after an adder addition, produce an output luminance signal.
The present invention provides a kind of color video quality control method in addition, and this method comprises the following steps: that (a) is converted to the component chroma signals that includes a luminance signal and chroma signals with colour-video signal source R, G, the B of an input; (b) calculate the hue value in described colour-video signal source by the colour-video signal source of described input; (c) hue value that obtains according to described calculating contrasts an aberration and saturation mapping correspondence table and obtains a form and aspect correction parameter and a saturation correction parameter; (d) with the described form and aspect correction parameter that obtains of described chroma signals foundation, carry out the rotation of signal coordinates axle with a Coordinate Conversion formula; (e) chroma signals of described conversion and the described saturation correction parameter that obtains are carried out multiplying each other of signal after, and obtain an output chroma signals.
The present invention contrasts the effect of prior art:
Compared to traditional colour signal treatment technology, the present invention need not change by complicated color space, can reach the purpose of individual color and color gamut conversion.The present invention utilizes the blind zone superposition to produce new mapping correspondence table, without the memory space of complex mathematical computing and saving record correspondence table.Without additional circuit, can integrate the whole district and independently adjustment simultaneously, can reach brightness, saturation and the adjustment of form and aspect isolated area simultaneously.
Specific embodiment of the present invention will and attachedly be graphic and be further described by following embodiment.
Description of drawings
Fig. 1 shows the system configuration schematic diagram of first embodiment of the invention color video quality regulation system;
The flow chart of form and aspect computing unit in Fig. 2 displayed map 1 when calculating the hue value of signal of video signal R, G, B;
Fig. 3 shows the system configuration schematic diagram of second embodiment of the invention color video quality regulation system;
Fig. 4 shows the system configuration schematic diagram of third embodiment of the invention color video quality regulation system;
Fig. 5 A and Fig. 5 B represent the waveform schematic diagram of the mapping corresponding relation between hue value Sh and form and aspect correction parameter dH;
Obtain the waveform schematic diagram of the waveform profiles of an output behind three actual shielding correspondence table superpositions of Fig. 6 A and Fig. 6 B demonstration;
Obtain another waveform schematic diagram of the waveform profiles of an output behind three actual shielding correspondence table superpositions of Fig. 7 A and Fig. 7 B demonstration;
Fig. 8 A and Fig. 8 B represent the waveform schematic diagram of the mapping corresponding relation between hue value and saturation correction parameter;
Form and aspect leveling factor unit in Fig. 9～Figure 12 displayed map 3 or the luminance factor amending unit different wave schematic diagram when carrying out the intensity of different subregion adjustment form and aspect and brightness;
The input luminance signal of image contrast regulon is the S curve with the corresponding relation of output luminance signal in Figure 13 and Figure 14 displayed map 4.
The primary clustering symbol description:
100,100a, 100b: color video quality regulation system
1: the signal of video signal source
2: the chrominance signal converting unit
3,3a: form and aspect and saturation conversion adjustment unit
31: signal coordinates axle rotary unit
32: multiplier
33: the form and aspect leveling factor unit
34: multiplier
35: adder
36: multiplier
4: chroma signals inverse conversion unit
5,5a: correction parameter generation unit
51: the form and aspect computing unit
52: aberration and saturation mapping correspondence table
52a: aberration and saturation and brightness mapping correspondence table
6: the brightness transition adjustment unit
61: the luminance factor amending unit
62: multiplier
63: adder
R, G, B: colour-video signal source
DH: form and aspect correction parameter
DH1: revised form and aspect correction parameter
DH2: total form and aspect correction parameter
DH_All: universe phase correction parameter
DC: saturation correction parameter
DC1: total saturation correction parameter
DC_All: universe saturation correction parameter
YC: luminance signal
DY: brightness correction parameter
DY1: revised brightness correction parameter
DY2: total brightness correction parameter
DY_All: universe brightness correction parameter
Sh: hue value
Pb, Pr: chroma signals
Pb ', Pr ': the chroma signals after the conversion
Yo: output luminance signal
Pbo, Pro: output chroma signals
Embodiment
Consult shown in Figure 1ly, it shows the system configuration schematic diagram of first embodiment of the invention color video quality regulation system.In the present embodiment color video quality regulation system 100, mainly be to include color signal converting unit 2 of the same colour, form and aspect and saturation conversion adjustment unit 3, a chroma signals inverse conversion unit 4, a correction parameter generation unit 5.Include a signal coordinates axle rotary unit 31 (Axis Rotation Circuit) and a multiplier 32 again in form and aspect and the saturation conversion adjustment unit 3.
The colour-video signal source R in signal of video signal source 1, G, B at first is converted to one through chrominance signal converting unit 2 and includes a brightness signal Y and chroma signals Pb, the component chroma signals Y of Pr, Pb, Pr, chroma signals Pb wherein, Pr can deliver to form and aspect and saturation conversion adjustment unit 3, make this chroma signals Pb, after the form and aspect correction parameter dH that Pr is produced according to correction parameter generation unit 5 carries out Coordinate Conversion and carries out multiplying each other of signal according to the saturation correction parameter d C that correction parameter generation unit 5 is produced in multiplier 32, and obtain exporting chroma signals Pbo, Pro.
When signal coordinates axle rotary unit 31 carries out the reference axis conversion, chroma signals Pb, Pr are carried out the conversion of signal coordinates according to form and aspect correction parameter dH and the following Coordinate Conversion formula of foundation that correction parameter generation unit 5 is produced:
Pb’＝(Pb*Cos(dH_θ)-Pr*Sin(dH_θ))
Pr’＝(Pr*Cos(dH_θ)+Pb*Sin(dH_θ))
Chroma signals after wherein Pb ', Pr ' expression is changed,
The chroma signals of the original input of Pb, Pr system expression,
DH_ θ system represents the angle θ of form and aspect correction parameter dH at the PbPr coordinate plane,
Chroma signals Pb, Pr obtain chroma signals Pb ', Pr ' that Coordinate Conversion is crossed after carrying out the reference axis conversion through signal coordinates axle rotary unit 31 with above-mentioned change type.The chroma signals Pb ' that changed, Pr ' after the saturation correction parameter d C that is produced with correction parameter generation unit 5 multiplies each other again, deliver to chroma signals inverse conversion unit 4 and obtain exporting chroma signals Pbo, Pro after delivering to multiplier 32.
The brightness signal Y that is produced by chrominance signal converting unit 2 is together delivered to together with above-mentioned output chroma signals Pbo, the Pro that obtains after the chroma signals inverse conversion unit 4, the output brightness signal Y o that can will change by chroma signals inverse conversion unit 4 and export chroma signals Pbo, Pro and send to target equipment (not shown).
Obtaining of above-mentioned form and aspect correction parameter dH and saturation correction parameter d C can be produced by correction parameter generation unit 5, after its signal of video signal R, G, the hue value Sh of B, shine upon correspondence table 52 (Hue andChroma Mapping Look-up Table) and obtain this form and aspect correction parameter dH and saturation correction parameter d C according to the hue value Sh of this colour-video signal source R that obtains, G, B and according to an aberration and saturation through form and aspect computing unit 51 this signal of video signal of calculating R, G, B with signal of video signal source 1.
The flow chart of form and aspect computing unit 51 in Fig. 2 displayed map 1 when calculating the hue value of signal of video signal R, G, B.At first after form and aspect computing unit 51 is being obtained signal of video signal R, G that signal of video signal source 1 produced, B (step 101), can define signal maximum Vmax=max (R, G, B) (step 102), the signal minimum Vmin=min (R, G, B) (step 103) of this signal of video signal R, G, B, and calculate both difference DELTA V=Vmax-Vmin (step 104) by this signal maximum Vmax and signal minimum Vmin.
Then judge the numerical values recited (step 105) of Vmax and Vmin,, promptly obtain the output result (step 106) of hue value Sh=0 if Vmax equals Vmin.If the differentiation result in the step 105 then further differentiates signal of video signal R and whether equals Vmax (step 107) for not; If then obtain the output result (step 108) of hue value Sh=60* (G-B)/Δ V.If, then further do not differentiate signal of video signal G and whether equal Vmax (step 109); If then obtain the output result (step 110) of hue value Sh=120* (B-R)/Δ V; If, then do not obtain the output result (step 111) of hue value Sh=240* (R-G)/Δ V.
After above-mentioned steps 108,110,111, can be again carry out and judge that hue value Sh whether less than 0 step (step 112), if not, can directly export (step 113) with the hue value Sh that obtains; If, then export (step 114) behind the hue value Sh+360 that hue value equals to obtain, again hue value Sh is exported.
Fig. 3 shows the system configuration schematic diagram of second embodiment of the invention color video quality regulation system.The part member of present embodiment is with embodiment illustrated in fig. 1 identical, so identical member is to indicate identical numbering, in order to resolution.Among the color video quality regulation system 100a of present embodiment, mainly be to include color signal converting unit 2 of the same colour, form and aspect and saturation conversion adjustment unit 3a, a chroma signals inverse conversion unit 4, a correction parameter generation unit 5a, a brightness transition adjustment unit 6.
The colour-video signal source R that signal of video signal source 1 is produced, G, B at first are converted to component chroma signals Y, Pb, a Pr who includes a brightness signal Y and chroma signals Pb, Pr through chrominance signal converting unit 2, chroma signals Pb wherein, Pr can deliver to form and aspect and saturation conversion adjustment unit 3a carries out the processing of multiplying each other of Coordinate Conversion and signal, and obtains exporting chroma signals Pbo, Pro.
Comprise a form and aspect computing unit 51 and an aberration and saturation and brightness mapping correspondence table 52a (Hue and Chroma and Brightness Mapping Look-up Table) among the correction parameter generation unit 5a.Signal of video signal R, the G that signal of video signal source 1 is produced, B calculate through form and aspect computing unit 51 after the hue value of this signal of video signal R, G, B, obtain form and aspect correction parameter dH, saturation correction parameter d C, and brightness correction parameter dY according to the hue value of this colour-video signal source R that obtains, G, B and according to aberration and saturation and brightness mapping correspondence table 52a.
The colour-video signal source R that signal of video signal source 1 is produced, G, B are converted to component chroma signals Y, Pb, a Pr who includes a brightness signal Y and chroma signals Pb, Pr through chrominance signal converting unit 2, and chroma signals Pb wherein, Pr can deliver to form and aspect and saturation conversion adjustment unit 3a.
Chroma signals Pb, Pr can deliver in the form and aspect leveling factor unit 33 simultaneously, and the form and aspect correction parameter dH that is produced with correction parameter generation unit 5a multiplies each other through a multiplier 34 again, and obtains a revised form and aspect correction parameter dH1.Revised form and aspect correction parameter dH1 again with universe mutually correction parameter dH_All and produce a universe form and aspect correction parameter dH2 through an adder 35 additions.Universe phase correction parameter dH_All is defined as the parameter that region-wide form and aspect are regulated simultaneously.
Moreover the saturation correction parameter d C that correction parameter generation unit 5a is produced can multiply each other through a multiplier 36 with a universe saturation correction parameter d C_All, and produces a total saturation correction parameter d C1.Universe saturation correction parameter d C_All is defined as the parameter that region-wide saturation is regulated simultaneously.
After signal coordinates axle rotary unit 31 among form and aspect and the saturation conversion adjustment unit 3a promptly carries out Coordinate Conversion according to above-mentioned resulting total form and aspect correction parameter dH2 and carries out multiplying each other of signal according to this total saturation correction parameter d C1 in multiplier 32, and obtain exporting chroma signals Pbo, Pro.
In the present embodiment, further the brightness signal Y that produces with 2 conversions of 6 pairs of chrominance signal converting units of brightness transition adjustment unit is carried out the processing of luminance signal.At first, chroma signals Pb, Pr deliver in the luminance factor amending unit 61, and the brightness correction parameter dY that is produced with correction parameter generation unit 5a multiplies each other through a multiplier 62 again, and obtains a revised brightness correction parameter dY1.Revised brightness correction parameter dY1 again with universe brightness correction parameter dY_All through an adder 63 additions, and produce a total brightness correction parameter dY2.Universe brightness correction parameter dY_All is defined as the parameter that universe brightness is regulated simultaneously.
The brightness signal Y that is produced by brightness transition adjustment unit 6 and the above-mentioned total brightness correction parameter dY2 that obtains be after an adder 64 additions, produces to export brightness signal Y o and deliver to chroma signals inverse conversion unit 4.
Fig. 4 shows the system configuration schematic diagram of third embodiment of the invention color video quality regulation system.The part member of present embodiment and embodiment illustrated in fig. 3 roughly the same is so identical member is to indicate identical numbering, in order to resolution.Among the color video quality regulation system 100b of present embodiment, mainly be to include color signal converting unit 2 of the same colour, form and aspect and saturation conversion adjustment unit 3a, a chroma signals inverse conversion unit 4, a correction parameter generation unit 5a, a brightness transition adjustment unit 6.These assemblies and embodiment illustrated in fig. 3 roughly the same, annexation between its operation principle and each assembly is also identical, its difference is among the brightness transition adjustment unit 6a, brightness signal Y and total brightness correction parameter dY2 are after an adder 64 additions, the output brightness signal Y o that produces is before delivering to chroma signals inverse conversion unit 4, can carry out the contrast adjusting of image output earlier through an image contrast regulon 7, will export brightness signal Y o again and export chroma signals inverse conversion unit 4 to.
In the above preferred embodiment explanation of the present invention, the colour-video signal source R that signal of video signal source 1 is produced, G, B system includes the colour-video signal source of R, G, B, and chroma signals system includes simulation chroma signals Pb, Pr or digital difference signal Cb, Cr or U, V, one of I, Q.
The corresponding system of employed data adopts the corresponding mode of reflection among aberration among aberration among above-mentioned first embodiment and the saturation mapping correspondence table 52 and second embodiment and saturation and the brightness mapping correspondence table 52a.Shown in Fig. 5 A and Fig. 5 B, the waveform schematic diagram of the mapping corresponding relation between its expression hue value Sh and form and aspect correction parameter dH.The hue value Sh (being that the user sets the form and aspect location point of wanting adjustment) of the abscissa system expression input in graphic, and the form and aspect correction parameter dH (being the form and aspect intensity that the user desires adjustment) of ordinate system expression output.
Contain among the blind zone M_LUT that is indicated in Fig. 5 A (Mask_Look-up Table) and cover several form and aspect correction parameters dH numerical value [12,11,9,6,4,2,1], number among the M_LUT of blind zone and numerical value can be set arbitrarily by the user.Desire the intensity of adjustment according to the user, it is as follows to obtain an actual shielding correspondence table:
(user desires the intensity of adjustment/M_max) to Real_M_LUT=M_LUT*
Wherein M_max=max (M_LUT) is the maximum among the expression blind zone M_LUT.
First numerical value is maximum in the M_LUT of blind zone, and correspond to the user and set the location point (the hue value Sh=60 shown in for example graphic) of wanting adjustment, with this position is the reflection axle center, after second half shielding correspondence table (M_LUT) of videoing out, produce the actual shielding of symmetry correspondence table (Real_M_LUT).At last, after the actual shielding correspondence table Real_M_LUT of several symmetries of superposition, can obtain n Real_M_LUT of a final correspondence table Final_LUT=superposition, shown in Fig. 5 B.
Shown in Fig. 6 A and Fig. 6 B, obtain the waveform schematic diagram of the waveform profiles of an output behind three actual shielding correspondence table superpositions of its demonstration.For example, the user is not [60,65,70], desires adjustment intensity and be respectively [10,8,10] that then these three reality shield result behind correspondence table M11, M12, the M13 superposition shown in Fig. 6 B when setting the location point Sh want adjustment.The number of actual shielding correspondence table Real_M_LUT superposition is not limited, and is mainly different according to the coverage of subregion desire adjustment.The user can change the location point and the various waveform profiles of adjustment intensity conversion behind superposition (Profile) of adjustment.
Shown in Fig. 7 A and Fig. 7 B, obtain another waveform schematic diagram of the waveform profiles of an output behind three actual shielding correspondence table superpositions of its demonstration.For example, the user is not [60,65,70], desires adjustment intensity and be respectively [8,10,8] that then these three reality shield result behind correspondence table M21, M22, the M23 superposition shown in Fig. 7 B when setting the location point Sh want adjustment.
Shown in Fig. 8 A and Fig. 8 B, the waveform schematic diagram of the mapping corresponding relation between its expression hue value Sh and saturation correction parameter d C.The hue value Sh (being that the user sets the saturation location point of wanting adjustment) of the abscissa system expression input in graphic, and the saturation correction parameter d C (being the saturation intensity that the user desires adjustment) of ordinate system expression output.
Contain among the blind zone M_LUT that is indicated in Fig. 8 A (Mask Look-up Table) and cover several saturation correction parameter d C numerical value [12,11,9,4,2,1], number among the M_LUT of blind zone and numerical value can be set arbitrarily by the user.Desire the intensity of adjustment according to the user, it is as follows to obtain an actual shielding correspondence table:
(user desires the intensity of adjustment/M_max) to Real_M_LUT=(0.5/M_max) * M_LUT*
Wherein M_max=max (M_LUT) is the maximum among the expression blind zone M_LUT.
First numerical value is maximum in the M_LUT of blind zone, and correspond to the user and set the location point (the hue value Sh=60 shown in for example graphic) of wanting adjustment, with this position is the reflection axle center, after second half shielding correspondence table (M_LUT) of videoing out, produce the actual shielding of symmetry correspondence table (Real_M_LUT).At last, after the correspondence table Real_M_LUT of several actual shielding symmetries of superposition, can obtain a final correspondence table Final_LUT=1+ (a superposition n Real_M_LUT), shown in Fig. 8 B.
Consult Fig. 9～Figure 12, the different wave schematic diagram of the form and aspect leveling factor unit 33 in its displayed map 3 (also applicable to luminance factor amending unit 6) when carrying out the intensity of different subregion adjustment form and aspect and brightness.As shown in the figure, according to the intensity of saturation infromation correction subregion adjustment form and aspect and brightness:
1.Coef_Y_y and Coef_H_y is respectively Y (brightness) and H (form and aspect) the coefficient correction value at y direction, its value is 0～1;
2. at the coefficient correction value Coef_x=(Pb*Pb+Pr*Pr) of X direction ^0.5;
Decide the coefficient value of output according to the setting of Coef_x and set point P1～Pn, wherein n is the number of set point.On the figure set point number n minimum be 3 points, do not limit at most.
3. different embodiment:
3-1: the intensity of subregion adjustment form and aspect and brightness can not change the intensity that desire is adjusted because of chroma is different, as shown in Figure 9;
3-2: the intensity of subregion adjustment form and aspect and brightness, only high chroma in the influence; The output factor correction value Coef_out=0 of low chroma in the present embodiment is so the subregion adjustment form and aspect of low chroma and the intensity of brightness are 0, as shown in figure 10;
3-3: the intensity of subregion adjustment form and aspect and brightness, only low chroma in the influence; The output factor correction value Coef_out=0 of high chroma in the present embodiment is so the intensity of the subregion adjustment form and aspect of high chroma and brightness is 0, as shown in figure 11;
3-4: can be according to the demand in the adjustment, in different chromas position, the subregion adjustment form and aspect that cause and the intensity of brightness are also different, as shown in figure 12.
Consult Figure 13 and Figure 14, the input luminance signal Y1 of image contrast regulon 7 is the S curve with the corresponding relation of output brightness signal Y o in its displayed map 4, makes the image dark space darker, and the clear zone is brighter.The S curve can utilize numerical method or by multiple spot or 4 corresponding method of forming an approximate S curve.With 4 be example (255,255), (x1, y1), (x2, y2), (0,0) changes that (x1, y1), (x2, y2) two point coordinates values can change the power of image contrast.
By above embodiment as can be known, the value on the true tool industry of color video quality regulation system provided by the present invention and method was so the present invention had accorded with the important document of patent already.But above narration only is preferred embodiment of the present invention explanation, allly is skillful in this skill person when can doing other all improvement according to above-mentioned explanation, and these change and still belong in invention spirit of the present invention and the following claim that is defined.
Claims (20)
1. a color video quality regulation system is characterized in that, described system comprises:
Color signal converting unit of the same colour is converted to the component chroma signals that includes a luminance signal and chroma signals in order to the colour-video signal source with an input;
One correction parameter generation unit, it contrasts an aberration and saturation mapping correspondence table and obtains a form and aspect correction parameter and a saturation correction parameter according to the described hue value that obtains by calculating in the described colour-video signal source after the hue value in described colour-video signal source;
One form and aspect and saturation conversion adjustment unit, it receives the chroma signals that described chrominance signal converting unit is produced, and described chroma signals carried out Coordinate Conversion according to described form and aspect correction parameter, the described saturation correction parameter of foundation is exported chroma signals and produce after a multiplier carries out multiplying each other of signal again.
2. color video quality regulation system as claimed in claim 1, it is characterized in that, described colour-video signal source includes the colour-video signal source of R, G, B, and described chroma signals includes simulation chroma signals Pb, Pr or digital difference signal Cb, Cr or U, V, one of I, Q.
3. color video quality regulation system as claimed in claim 1 is characterized in that, described form and aspect and saturation conversion adjustment unit include:
One signal coordinates axle rotary unit, it receives described chroma signals, and described chroma signals is carried out the conversion of signal coordinates and obtained the chroma signals that Coordinate Conversion is crossed according to described form and aspect correction parameter;
One multiplier, it exports chroma signals and obtain one after described chroma signals of crossing through Coordinate Conversion is multiplied each other with described saturation correction parameter.
4. color video quality regulation system as claimed in claim 1, it is characterized in that luminance signal that described chrominance signal converting unit is produced and described form and aspect and the common component chroma signals of forming of the saturation conversion output chroma signals that adjustment unit produced are sent by a chroma signals inverse conversion unit.
5. a color video quality regulation system is characterized in that, described system comprises:
Color signal converting unit of the same colour is converted to the component chroma signals that includes a luminance signal and chroma signals in order to the colour-video signal source with an input;
One correction parameter generation unit, it contrasts an aberration and saturation and brightness mapping correspondence table and obtains a form and aspect correction parameter, a saturation correction parameter and a brightness correction parameter according to the described hue value that obtains by calculating in the described colour-video signal source after the hue value in described colour-video signal source;
One form and aspect and saturation conversion adjustment unit, it receives the chroma signals that described chrominance signal converting unit is produced, and described chroma signals carried out Coordinate Conversion according to described form and aspect correction parameter, the described saturation correction parameter of foundation is exported chroma signals and produce after a multiplier carries out multiplying each other of signal again;
One brightness transition adjustment unit, it receives the chroma signals that described chrominance signal converting unit is produced, and with described chroma signals according to described brightness correction parameter after an adder addition, produce an output luminance signal.
6. color video quality regulation system as claimed in claim 5, it is characterized in that, described colour-video signal source includes the colour-video signal source of R, G, B, and described chroma signals includes simulation chroma signals Pb, Pr or digital difference signal Cb, Cr or U, V, one of I, Q.
7. color video quality regulation system as claimed in claim 5 is characterized in that, described form and aspect and saturation conversion adjustment unit include:
One signal coordinates axle rotary unit, it receives described chroma signals, and described chroma signals is carried out the conversion of signal coordinates and obtained the chroma signals that Coordinate Conversion is crossed according to described form and aspect correction parameter;
One multiplier, it exports chroma signals and obtain one after described chroma signals of crossing through Coordinate Conversion is multiplied each other with described saturation correction parameter.
8. color video quality regulation system as claimed in claim 5, it is characterized in that output luminance signal that described brightness transition adjustment unit produces and described form and aspect and the common component chroma signals of forming of the saturation conversion output chroma signals that adjustment unit produced are sent by a chroma signals inverse conversion unit.
9. color video quality regulation system as claimed in claim 5, it is characterized in that, described chroma signals is also delivered in the form and aspect leveling factor unit, the form and aspect correction parameter that is produced with described correction parameter generation unit multiplies each other through a multiplier again, and obtain a revised form and aspect correction parameter, described revised form and aspect correction parameter again with a universe mutually correction parameter through an adder addition, deliver to described form and aspect and saturation conversion adjustment unit and produce a total form and aspect correction parameter, with the form and aspect correction parameter when carrying out Coordinate Conversion as described form and aspect and saturation conversion adjustment unit.
10. color video quality regulation system as claimed in claim 5, it is characterized in that, a saturation correction parameter that described correction parameter generation unit is produced and a universe saturation correction parameter multiply each other through a multiplier, deliver to multiplier in described form and aspect and the saturation conversion adjustment unit and produce a total saturation correction parameter, with as described form and aspect and the saturation conversion adjustment unit saturation correction parameter when carrying out the multiplying each other of signal.
11. color video quality regulation system as claimed in claim 5, it is characterized in that, include a luminance factor amending unit in the described brightness transition adjustment unit, the chroma signals that described luminance factor amending unit is produced described chrominance signal converting unit receives and carries out after the luminance factor correction, the brightness correction parameter that is produced with described correction parameter generation unit multiplies each other through a multiplier again, and obtain a revised brightness correction parameter, again with described revised brightness correction parameter and a universe brightness correction parameter through an adder addition, and produce a total brightness correction parameter, as the brightness correction parameter of described brightness transition adjustment unit, so that described brightness transition adjustment unit produces described output luminance signal.
12. color video quality regulation system as claimed in claim 11, it is characterized in that, also include an image contrast regulon in the described brightness transition adjustment unit, further make image contrast with the output luminance signal that described brightness transition adjustment unit is produced and regulate, export described output luminance signal again.
13. a color video quality control method, this method comprises the following steps:
(a) colour-video signal source R, G, the B with an input is converted to the component chroma signals that includes a luminance signal and chroma signals;
(b) calculate the hue value in described colour-video signal source by the colour-video signal source of described input;
(c) hue value that obtains according to described calculating contrasts an aberration and saturation mapping correspondence table and obtains a form and aspect correction parameter and a saturation correction parameter;
(d) with the described form and aspect correction parameter that obtains of described chroma signals foundation, carry out the rotation of signal coordinates axle with a Coordinate Conversion formula;
(e) chroma signals of described conversion and the described saturation correction parameter that obtains are carried out multiplying each other of signal after, and obtain an output chroma signals.
14. color video quality control method as claimed in claim 13, it is characterized in that, in the step (a), described colour-video signal source includes the colour-video signal source of R, G, B, and described chroma signals includes simulation chroma signals Pb, Pr or digital difference signal Cb, Cr or U, V, one of I, Q.
15. color video quality control method as claimed in claim 13 is characterized in that, in the step (d), described Coordinate Conversion formula is:
Pb’＝(Pb*Cos(dH_θ)-Pr*Sin(dH_θ))
Pr’＝(Pr*Cos(dH_θ)+Pb*Sin(dH_θ))
Chroma signals after wherein Pb ', Pr ' expression is changed,
Pb, Pr represent the chroma signals of original input,
DH_ θ represents the angle θ of form and aspect correction parameter dH at the PbPr coordinate plane.
16. color video quality control method as claimed in claim 13 is characterized in that, in the step (b), the hue value in described colour-video signal source is calculated by the following step:
(b1) signal maximum, signal minimum and the signal maximum in the described colour-video signal of definition source and the difference DELTA V of signal minimum;
(b2) size of described signal maximum of judgement and signal minimum if both are equal, promptly produces the output result of hue value=0;
(b3) if signal maximum and signal minimum are unequal, then further differentiate signal of video signal R and whether equal signal maximum, if then obtain the output result of hue value=60* (G-B)/Δ V; If not, then further differentiate signal of video signal G and whether equal signal maximum, if, then obtain the output result of hue value=120* (B-R)/Δ V, if deny, then obtain the output result of hue value=240* (R-G)/Δ V.
17. color video quality control method as claimed in claim 16 is characterized in that, step (b3) also comprises the following steps: afterwards
(b4) whether judge hue value less than 0, if not, promptly directly with the hue value output that obtains, if, hue value+360 of then exporting hue value=obtain.
18. color video quality control method as claimed in claim 13 is characterized in that, includes also in the step (f) that the hue value that obtains according to described calculating contrasts an aberration and saturation and brightness mapping correspondence table and the step that obtains a brightness correction parameter.
19. color video quality control method as claimed in claim 18 is characterized in that, described method also comprises the following steps: the described brightness correction parameter of described chroma signals foundation to produce an output luminance signal after an adder addition.
20. color video quality control method as claimed in claim 18 is characterized in that, described aberration and saturation mapping correspondence table are formed by the following step:
(a) definition one blind zone M_LUT in aberration and saturation mapping correspondence table;
(b) set the form and aspect location point of wanting adjustment and the form and aspect intensity of desiring adjustment according to the user, obtain an actual shielding correspondence table Real_M_LUT=M_LUT* (user desire adjustment intensity/M_max), wherein M_max=max (M_LUT) is the maximum among the expression blind zone M_LUT;
(c) first numerical value is maximum in the M_LUT of blind zone, and corresponds to the form and aspect location point that adjustment is wanted in user's setting, serves as the reflection axle center with described form and aspect location point, maps out second half to described aberration and saturation mapping correspondence table;
(d) will obtain a final correspondence table as described aberration and saturation mapping correspondence table after the actual shielding of several symmetries correspondence table Real_M_LUT superposition.
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| CNA2007101942062A CN101459855A (en) | 2007-12-12 | 2007-12-12 | Color video quality regulation system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118624A (en) * | 2011-03-08 | 2011-07-06 | 天脉聚源(北京)传媒科技有限公司 | Method for converting an image from an RGB color space to a YUV color space |
| WO2013117110A1 (en) * | 2012-02-10 | 2013-08-15 | 华为终端有限公司 | Image hue determination method and wireless handheld device |
| CN103379347A (en) * | 2012-04-12 | 2013-10-30 | 钰瀚科技股份有限公司 | Apparatus for generating correction parameter |
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2007
- 2007-12-12 CN CNA2007101942062A patent/CN101459855A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118624A (en) * | 2011-03-08 | 2011-07-06 | 天脉聚源(北京)传媒科技有限公司 | Method for converting an image from an RGB color space to a YUV color space |
| CN102118624B (en) * | 2011-03-08 | 2012-12-26 | 天脉聚源(北京)传媒科技有限公司 | Method for converting an image from an RGB color space to a YUV color space |
| WO2013117110A1 (en) * | 2012-02-10 | 2013-08-15 | 华为终端有限公司 | Image hue determination method and wireless handheld device |
| US8577133B2 (en) | 2012-02-10 | 2013-11-05 | Huawei Device Co., Ltd | Method and wireless handheld device for determining image hue |
| US8948504B2 (en) | 2012-02-10 | 2015-02-03 | Huawei Device Co., Ltd. | Device and machine readable medium for determining image hue |
| CN103379347A (en) * | 2012-04-12 | 2013-10-30 | 钰瀚科技股份有限公司 | Apparatus for generating correction parameter |
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