CN1997165A - Method and device for digital image adaptative color adjustment of display - Google Patents
Method and device for digital image adaptative color adjustment of display Download PDFInfo
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Abstract
This invention provides one display digital image adaptive color adjust method and device, which can automatically, improves the output image comparison and dynamic range aiming for image content when the display plays the digital images. This invention can compute brightness distribution statistic pattern and analyzes image dynamic range degree and computes dynamic range extensive parameters and analyzes comparison intensity parameters of images.
Description
Technical field
The present invention relates to a kind of digital picture adaptability color adjustment method and device of display.The present invention be more particularly directed to a kind of image brightness and adaptability color adjustment method and device of increasing picture quality adjusted.
Background technology
Recently display is quite paid attention to the visual quality of output image, so the display hardware interface also provides OSD (On Screen Display, display display and operation), adjusts output image quality voluntarily for the user.
What OSD referred to similarly is that picture can show set point with grid or numeral when adjusting the function of volume or brightness and so on.Suitable many of the function integrated of OSD now except functions such as basic brightness, contrast, displacement adjustment, even comprise that also barrel shape distortion, trapezoidal distortion, parallelogram distortion, pincushion phenomenon etc. all can improve by adjusting the OSD set point.
The benefit of using OSD has been for significantly having reduced knob, also thereby reduced the chance of loose contact, and the set point of adjusting can be stored.
Yet adjust OSD and be set at fixing adjustment mechanism, it can't allow display keep the display quality of image forever is optimization.
Multiple known image adjustment technology is now also arranged, be listed below now.
U.S. Patent number US6778183 B1 utilizes the probability distribution figure of accumulated image luminance signal, as the foundation of the overall brightness attribute of judging image.Using such method is divided into dark image, middle gray scale image or bright image (dark, mid tone or bright image) with attributes of images, or the attribute of any two combinations wherein.Go into correspondence table (In-OutLookUp Table) according to the image attributes of being judged with three kinds of different outputs and can adjust image comparison.Serve as the foundation of definition dynamic range (dynamic range) size with bright spot simultaneously with dim spot in the image pixel.The emphasis of this patent is providing three modifiable LUT of user to strengthen contrast and dynamic range.Characteristics are the use look-up table, so speed is fast.
U.S. Patent number US6771837 B1 discloses a kind of method that improves the integral image contrast.Utilization distributes all images information of spatial domain and is converted to the frequency distribution of frequency domain, and it adopts the Fu Shi transformation approach to distinguish high frequency and low frequency term time, and then judgement picture material and being strengthened.Its characteristics are that effect is remarkable, but too complicated because of the computing of Fu Shi transformation approach when hardware is realized, circuit design is difficulty quite.
U.S. Patent number US6618045 B1 discloses a display equipment, and it is with the transducer of one group of sensing user context light; One group of OSD can provide the user to set brightness, the contrast of hobby screen display; And special disposal is along with context light changes and the software logic structure of adjustment screen output quality.
Desire keeps the picture quality optimization different adjustment mechanism to be arranged at the image of heterogeneity.Simple adjustment mechanism does not contain a large amount of mathematical operations, and obvious reinforced effects can't be arranged.But the complicated mechanism of adjusting not only causes computational burden when hardware is realized, also highlight the difficulty of hardware circuit design.
So, need a kind of better image accommodation method, can finish the quality of computing and raising output image in real time.And can reach fast automatic adjustment and improve the optimized purpose of output image quality.
Summary of the invention
One of purpose of the present invention provides a kind of image adaptability color and adjusts mechanism, its statistical picture luminance signals become branch original probability distribution figure, analysis image monochrome information, recomputate and meet the probability distribution situation of human eye vision after the brightness autobalance.
Another object of the present invention provides a kind of image adaptability color and adjusts mechanism, calculates extension bitmap as dynamic range parameters, the automatic corresponding table of the input and output of adjusting dynamic range of images that produces according to the probability distribution figure that recomputates the back.
Another object of the present invention provides a kind of image adaptability color and adjusts mechanism, and the image comparison of calculating and adjust the image comparison parameter, choose algorithm bist data storehouse according to the probability distribution figure that recomputates the back strengthens curve.
Another object of the present invention provides a kind of image adaptability color and adjusts mechanism, when continuous broadcast digital picture, utilizes the method for average to reduce correspondence table and changes, to reduce the discomfort that is produced when human eye is viewed and admired.
Another object of the present invention provides a kind of image adaptability color and adjusts mechanism, and the image that strengthens the back is done suitable color compensation.
One embodiment of the invention provides a kind of digital picture adaptability color adjusting device of display, comprise: analytic unit, receive the YC picture signal, this YC picture signal has brightness composition and colourity composition at least, the probability distribution figure of this brightness composition of this analytic unit analysis and this YC picture signal of restatement is to obtain weight brightness probability distribution figure; Dynamic range brightness correspondence table generation unit receives this weight brightness probability distribution figure that this analytic unit is exported, and produces dynamic range brightness correspondence table; Contrast the correspondence table generation unit that highlights, receive this weight brightness probability distribution figure that this analytic unit is exported, produce and contrast the correspondence table that highlights, in order to adjust the image comparison of this brightness composition; The brightness adjustment unit according to this dynamic range brightness correspondence table and the contrast correspondence table that highlights, is adjusted this brightness composition of this YC picture signal; The chroma adjustment unit according to the brightness relationship of adjusting front and back, produces the chroma compensating factor, in order to the chromatic component of compensate for brightness chromatic diagram image signal.By this to obtain the picture signal that brightness composition and colourity composition all obtain compensation.
Another embodiment of the present invention provides a kind of digital picture adaptability color adjusting device of display, comprise: signal conversion unit, receive first picture signal to convert second picture signal to, this first picture signal does not have the composition of brightness, chrominance separation, and this second picture signal has the composition of brightness, chrominance separation; Analytic unit is analyzed the also probability distribution figure of this brightness composition of this second picture signal of weight calculation, to obtain weight brightness probability distribution figure; Dynamic range brightness correspondence table generation unit receives this weight brightness probability distribution figure that this analytic unit is exported, and produces dynamic range brightness correspondence table, in order to adjust the dynamic range of this brightness composition; Contrast the correspondence table generation unit that highlights, receive this weight brightness probability distribution figure that this analytic unit is exported, produce and contrast the correspondence table that highlights, in order to adjust the image comparison of this brightness composition; The smoothness adjustment unit, get this dynamic range brightness correspondence table generation unit produce more than dynamic range brightness correspondence table, level and smooth in addition, to produce level and smooth back dynamic range brightness correspondence table, and get this contrast highlight the correspondence table generation unit produce more than a contrast correspondence table that highlights, in addition level and smooth, to produce the level and smooth back contrast correspondence table that highlights; The brightness adjustment unit according to this level and smooth back dynamic range brightness correspondence table and the correspondence table that should the contrast of level and smooth back highlights, is adjusted this brightness composition of this second picture signal and is adjusted back brightness composition to produce; The chroma compensating unit according to the brightness relationship of adjusting front and back, produces the chroma compensating factor, and in order to compensate the chromatic component of second picture signal; And the inverse signal converting unit, receive this colourity composition of this second picture signal and this adjustment back brightness composition, to convert output image signal to, this output image signal does not have the composition of brightness, chrominance separation.
The present invention's another embodiment provides a kind of image adaptability color adjustment method, comprising: (A) received image signal that will import continuously is converted to continuous YC separation signal, and this YC separation signal contains the brightness composition; (B) add up the probability distribution figure of this brightness composition, and carry out Adaptive Weight and distribute, to obtain weight brightness probability distribution figure; (C) this weight brightness probability distribution figure is carried out dynamic range (DR) and extend, to obtain dynamic range brightness correspondence table (LUT_DR); (D) this weight brightness probability distribution figure is compared enhancing (CT), to obtain contrasting the correspondence table (LUT_CT) that highlights; (E) this contrast correspondence table that highlights is carried out curve smoothing; (F) a dynamic range brightness correspondence table addition more than a plurality of brightness composition institute correspondence is average and form the dynamic range brightness correspondence table that is applied to follow-up brightness composition, and the correspondence table addition that highlights of a level and smooth back contrast more than a plurality of brightness composition institute correspondence is average and form the contrast that is applied to this follow-up brightness composition correspondence table that highlights; (G) according to this dynamic range brightness correspondence table of on average forming and this contrast correspondence table that highlights, this follow-up brightness composition is carried out the brightness adjustment; (H) according to the difference degree that concerns between the brightness composition of adjusting front and back, produce the chroma compensating factor; (I), carry out the compensation of image chroma according to this chroma compensating factor that is produced; And (J) this YC separation signal after brightness adjustment and the colourity adjustment is carried out inverse conversion, to produce continuous output image signal.
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the functional-block diagram of the adaptability color adjusting device 100 of one embodiment of the invention.
Fig. 2 is image brightness probability distribution figure and weight allocation image brightness probability distribution figure;
Fig. 3 is the schematic diagram of dynamic range of images adjustment (LUT_DR);
Fig. 4 is image comparison adjustment (LUT_CT) schematic diagram;
Fig. 5 is for promoting the schematic diagram that image comparison is adjusted smoothness of curve;
Fig. 6 is for improving the schematic diagram of Image Smoothness.
The main element description of symbols
100: the adaptability color adjusting device
110: signal conversion unit
115: analytic unit
120: dynamic range brightness correspondence table generation unit
130: contrast the correspondence table generation unit that highlights
140: the smoothness adjustment unit
150: the brightness adjustment unit
170: the chroma compensating unit
160: the inverse signal converting unit
Embodiment
The present invention's embodiment discloses a kind of Input Image Content of analyzing, and calculating is in order to the parameter of adjustment contrast, dynamic range and the image demonstration adjustment mechanism that produces the brightness correspondence table and carry out the chroma compensation according to the brightness relationship of adjusting front and back.
Fig. 1 shows the functional-block diagram according to one embodiment of the invention.The function of adaptability color adjusting device 100 comprises at least: carry out conversion of signals, to obtain the YC separation signal; Calculating desire adjusts the parameter of dynamic range of images (Dynamic Range is called for short with DR) and produces brightness correspondence table (LUT of dynamic range stretch is called for short with LUT_DR) automatically; Calculate the brightness correspondence table (LUT of contrast enhancement is with the LUT_CT abbreviation) that desire is adjusted the parameter of image comparison (Contrast is called for short with CT) and produced (or choose in the bist data storehouse) contrast enhancings automatically; For increasing smoothness and adjusting integral image brightness, also can readjust by a small margin the LUT_CT curve automatically.When if received image signal is the still image signal, concern difference degree according to the brightness composition of image brightness composition after the LUT_CT of this LUT_DR that produces automatically and this automatic fine tuning adjusts, calculate the chroma compensating factor, and adjust the brightness of this picture signal and chromatic component with output digital image.When if received image signal is continuous dynamic image signal, with the output image comfort is under the purpose, the LUT_DR of a plurality of generations is automatically done the smoothness processing with the LUT_CT that finely tunes the back, concern difference degree according to the brightness composition of adjusting front and back, calculate this chroma compensating factor, and adjust the brightness of this picture signal and chromatic component with output digital image.
Adaptability color adjusting device 100 comprises as shown in Figure 1: signal conversion unit 110, analytic unit 115, dynamic range brightness correspondence table generation unit 120, contrast the correspondence table generation unit 130 that highlights, smoothness (smoothing) adjustment unit 140, brightness adjustment unit 150, chroma compensating unit 170, and inverse signal converting unit 160.
In addition, for the simulation human eye vision has the reaction of autobalance to brightness, analytic unit 115 is also suitably made weight allocation with this brightness probability distribution figure.Such as, with every number of times among the probability distribution figure be higher than the maximum persons of occurrence number (MaxH) certain ratio (such as, half) person, adjusted; Number of times remains unchanged than the low person of MaxH/2.As shown in Figure 2, h1＞MaxH/2 then is adjusted into h1 ' with h1, the * 0.5 of h1 '=(MaxH/2+h1).Number of times is kept former occurrence number than the low person of MaxH/2, as: h0＜MaxH/2, then h0 remains unchanged.The mode of adjusting according to this can obtain the brightness probability distribution figure (Adaptive Histogram is called for short with ADH) of different curves with original image, shown in the dotted line of Fig. 2.
The ADH that analytic unit 115 is produced then inputs to dynamic range brightness correspondence table generation unit 120 and the contrast correspondence table generation unit 130 that highlights, in order to produce dynamic range brightness correspondence table (LUT_DR) and the contrast correspondence table (LUT_CT) that highlights.
The ADH that 120 pairs of analytic units 115 of dynamic range brightness correspondence table generation unit are produced carries out dynamic range, and (Dynamic Range DR) extends processing.At first, dynamic range brightness correspondence table generation unit 120 is according to ADH, further the original black rank point (being called for short with DRb) and Bai Jiedian (being called for short with DRw) of computed image.DRb can be the digital value for dim spot in the image, can also be for reaching the digital value of certain value (as 0.1) by digital value 0 toward the high digital value direction occurrence number that adds up on the ADH curve.DRw can be the digital value for bright spot in the image, can also be on the ADH curve reaches the digital value of certain value (as 0.1) by digital value 255 toward the low digital value directions occurrence number that adds up.As under the 8bit system, in the ADH distribution map of certain image, probability always occurring and can reaching the probability that adds up more than or equal to 0.1 of the digital value that adds up 0～10 then can be decided DRb=10; Probability always occurring and can reaching the probability that adds up more than or equal to 0.1 of the digital value that adds up 230～255 then can be decided DRw=230.
The digital value scope of the system that at utmost should be distributed in of DR, that is: under the 8bit system, DRb=0, DRw=255; Under the 10bit system, DRb=0, DRw=1023.Calculate the DRb and DRw of original image by said method after, can define arbitrarily digital value DRb ' less than DRb (DRb '＜DRb) be new black rank points, arbitrarily definition greater than the digital value DRw ' of DRw (DRw '＞DRw) be defined as new white rank point.
Calculate DRb, DRw and definition DRb ', the purpose of DRw ' is for calibrating two breakover points of LUT_DR.Breakover point is (DRb, DRb ') and (DRw, DRw ') in the mode of setting up of the coordinate points that LUT_DR goes up, and wherein DRb and DRw are the black rank point and the Bai Jiedian of original image; DRb ' and DRw ' then are new black rank point and new white rank point.Its schematic diagram such as Fig. 3, wherein dotted line is the LUT curve that extends adjustment without DR, and solid line is the LUT curve after DR extends adjustment.
The corresponding output valve (Output) of institute that two end points of foundation and two breakover points can be set up out input value on the LUT_DR curve (Input) automatically.The mode that produces output valve can get according to linear interpolation mode or the computing of non-linear interpolation mode.The brightness value of ADH distribution map is promptly shown to finish DR according to this and is extended action.
Contrast the 130 couples of ADH of correspondence table generation unit that highlight and compare enhancement process.According to ADH, the dark-coloured and light tone pixel composition of further computed image.Under the 8bit system, the scope that present embodiment defines dark-coloured composition is distributed in digital value 0 to 40 on the probability distribution figure; The scope of definition light tone composition is distributed in digital value 215 to 255 on the probability distribution figure.Under the 10bit system, dead color is distributed in 0 to 160; Light tone is distributed in 863 to 1023.
In the present embodiment, calculate interior probit value that adds up (representing this probit value that adds up) of dark-coloured scope and the interior probit value that adds up (representing this probit value that adds up) of light tone scope with F2 with F1.Different F1 and F2 value chart picture are dark, light tone composition number differs, and must be strengthened visual contrast by the LUT_CT of different curve shapes.In the present embodiment, LUT_CT is made up of bist data storehouse LUT_CTF1 and LUT_CTF2, its covering scope such as Fig. 4.Can select half sigmoid curve (LUT_CTF1) that must strengthen dark-coloured one-tenth branch according to F1 value size; Can select half sigmoid curve (LUT_CTF2) that must strengthen light tone one-tenth branch according to F2 value size.
Under the 8bit system, LUT_CTF1 is the brightness correspondence table (as a of Fig. 4, b, c and d) of four digital values 0 to 79; LUT_CTF2 be four digital values 80 to 255 the brightness correspondence table (as Fig. 5. e, f, g and h).Under the 10bit system, LUT_CTF1 then is the brightness correspondence table of four digital values 0 to 317; LUT_CTF2 is the brightness correspondence table of four digital values 321 to 1023.
Article four, the alternative condition of LUT_CTF1 can according to the institute calculate and must F1 and k* (F1 computer capacity/full brightness digital value) decide; Article four, the alternative condition of LUT_CTF2 can according to the institute calculate and must F2 and k* (F2 computer capacity/full brightness digital value) decide.K is the adjustment factor of selecting half sigmoid curve, and the k value is between 0～1.2.With the 8bit system is example, and the F1 computer capacity is 40-0=40; The F2 computer capacity is 255-215=40; The full brightness digital value then is 255-0=255.Therefore only must be according to F1 and F2 value, the contrast option table can be selected LUT_CTF1 and the LUT_CTF2 curve that is suitable for strengthening contrast.Half sigmoid curve alternative condition is according to listed as the different value of K of following table:
| Half sigmoid curve | Alternative condition | The k value | |
| LUT_CTF1 | a. | ?F1＞＝(k1*0.16) | k1＝1.2 k2＝0.8 k3＝0.5 |
| b. | (k1*0.16)＞F1＞＝(k2*0.16) | ||
| c. | (k2*0.16)＞F1＞＝(k3*0.16) | ||
| d. | (k3*0.16)＞F1 | ||
| Half sigmoid curve | Alternative condition | ||
| LUT_CTF2 | e. | (k3*0.16)＞F2 | |
| f. | (k2*0.16)＞F2＞＝(k3*0.16) | ||
| g. | (k1*0.16)＞F2＞＝(k2*0.16) | ||
| h. | F2＞＝(k1*0.16) | ||
The F1 and the F2 that are drawn by aforementioned calculation can select LUT_CTF1 and LUT_CTF2 curve according to last table.Yet, if directly selected LUT_CTF1 and LUT_CTF2 curve are combined into LUT-CT, in some cases, it is excessive to cause the slope of curve at the point of interface place of LUT_CTF1 and LUT_CTF2 to change suddenly, causes some image inharmonious picture to occur after LUT_CT brightness correspondence is tabled look-up.
Produce for reducing inharmonious picture, reach the image brightness optimization simultaneously, present embodiment increases the LUT_CT smoothness of curve as follows.Such as, as shown in Figure 5, the digital value of LUT_CTF1 and LUT_CTF2 point of interface (being called for short with midgry) deducts the first fine setting coefficient g1 respectively and adds the second fine setting coefficient g2, gets the fine setting that this midgry-g1, midgry and midgry+g2 three-dimensional point carry out the brightness enhancing.
As under the 8bit system, the point of interface midgry of LUT_CTF1 and LUT_CTF2 is 80.Be to increase the whole smoothness of LUT_CT, can get g1=10 after LUT_CT is finished in LUT_CTF1 and LUT_CTF2 construction, g2=20 promptly carries out brightness correction with 70,80,100 three-dimensional points.Revising purpose is to make the curve between 70 to 100 more level and smooth.
Modification method can be rebuild 70 to 100 LUT_CT contents value for the once linear interpolation method of getting 70 and 100 liang of coordinate points; Or get 70,80 and 100 three-dimensional points and do repeatedly linear interpolation mode and rebuild 70 to 100 LUT_CT contents value, as shown in Figure 5.The LUT_CT of mode gained has the function that strengthens image comparison and image brightness according to this.In Fig. 5, demonstrate originally selected LUT_CTF1 and LUT_CTF2.As for 70～100 of coordinate points then being the fine setting zone.
In sum, for reaching the purpose that strengthens image comparison and image brightness optimization, contrast the correspondence table of correspondence table generation unit 130 meeting generations that highlight in conjunction with Fig. 4 and Fig. 5.
In the digital picture of continuous broadcast, present embodiment can produce the LUT_DR and the LUT_CT of difference at the picture material of looking frame (frame) individually.But, be easy to visually produce uncomfortable sensation if the LUT variation difference of looking continuously between the frame is excessive.When hardware is realized, must consider that the hardware computing strengthens the consume time of parameter simultaneously.Smoothness adjustment unit 140 promptly can be used for improving Image Smoothness (Color Smoothing, C.S.), its schematic diagram such as Fig. 6.
Suppose that hardware computing parameter (that is producing correspondence table) must account for two and look the frame time.In the present embodiment, the level and smooth mechanism of C.S. promptly get a plurality of computings and LUT to do the addition of curve contents value average, to be used as the LUT that this looks frame.
Illustrate in greater detail, be applied to the N～N+2 LUT_DR that looks frame and get N-6 LUT_DR and the individual curve contents value addition of looking the LUT_DR of frame gained of N-3 of looking the frame gained on average to get.Similarly, being applied to the N～N+2 LUT_CT that looks frame on average gets N-6 LUT_CT and the individual curve contents value addition of looking the LUT_CT of frame gained of N-3 of looking the frame gained.In Fig. 6, N-6 LUT_DR and LUT_CT that looks the frame gained got in the LUT_N-6 representative, and other meaning can be analogized.
According to smoothness adjustment unit 140 LUT_DR ' that on average go out, LUT_CT ', brightness adjustment unit 150 is adjusted brightness signal Y, to obtain new brightness signal Y '.
Cb’＝f*Cb；
Cr’＝f*Cr；
At last, inverse signal converting unit 160 is again according to new brightness signal Y ' with compensation back carrier chrominance signal (Cb ', Cr '), carry out inverse conversion, to obtain output image signal (R ' G ' B ').Output image signal (R ' G ' B ') can improve image comparison, dynamic range and Image Smoothness, the while can be kept the consistency of picture tone.
Note that then the embodiment of the invention (as Fig. 1) can not comprise this smoothness adjustment unit 140 if input picture is a still image (as digital photograph) etc.That is, be directly inputted into this brightness adjustment unit 150 by correspondence table generation unit 120 and the 130 correspondence table LUT_DR that produced and LUT_CT, adjusting brightness signal Y, but still need chroma compensating unit 170.
Another embodiment of the present invention provides a kind of image adaptability color adjustment method.Received image signal is the RGB digital signal, supposes that hardware computing color adjusts parameter and must account for two and look the frame time.Then the method for this embodiment comprises the following steps.
A.) all digital signal RGB that N in the image looked frame are converted to the signal YCbCr of brightness and chrominance separation.
B.) add up that probability distribution figure appears in brightness Y under the full images that this N looks frame.
C.) original image probability distribution figure is carried out Adaptive Weight and distribute (ADH).
D.) carrying out dynamic range (DR) extends: get the minimum digital value that occurs among the ADH and be DRb (such as, be made as 30), with the maximum numeric value of appearance be DRw (such as, be made as 240), draw up arbitrarily DRb ' (such as, be made as 10) and DRw ' (such as, be made as 250), DRw '＜DRb wherein; DRw '＞DRw.Calculate LUT_DR according to 4 of coordinate points (0,0) (30,10) (240,250) (255,255), wherein export digital value and calculate according to linear interpolation or non-linear interpolation mode.
E.) contrast strengthens: calculate dark-coloured composition (digital value 0～40) under the ADH the F1 value (such as, be 0.05), with the F2 value of light tone composition (digital value 215～255) (such as, be 0.3).According to the F1 value by in the LUT_CTF1 scope, selecting half suitable sigmoid curve in the database; According to the F2 value by in the LUT_CTF2 scope, selecting half suitable sigmoid curve in the database, but so construction goes out LUT_CT.For increasing LUT_CT smoothness of curve and image brightness optimization, level and smooth two coordinate points of finely tuning zone (70～100, its selection mode such as above-mentioned) that LUT_CT is gone up recomputate the matrix contents value between the digital value 70 to 100 in once linear mode (or getting the three-dimensional point with the secondary linear mode) and finish LUT_CT fine setting program.
F.) raising Image Smoothness: N-6 LUT_DR and the individual curve contents value addition of looking the LUT_DR of frame gained of N-3 of looking the frame gained on average become the N～N+2 LUT_DR that looks the enhancing of frame palpus; N-6 LUT_CT and the individual curve contents value addition of looking the LUT_CT of frame gained of N-3 of looking the frame gained on average become the N～N+2 LUT_CT that looks the enhancing of frame palpus.
G.) luminance signal of original image (is supposed the digital value (Y of certain luminance chrominance signal in the image, Cb, Cr)=(100,30 ,-30)), according to look-up table inquiry LUT_DR, LUT_CT can get new luminance signal (suppose new luminance chrominance signal digital value (Y ', Cb, Cr)=(110,30 ,-30)).
H.) according to the relation between original luminance signal (Y) and new luminance signal (Y '), define the chroma compensating factor and (suppose to be between f and Y '/Y once linear relationship, that is, f=110/100=1.1 then), chromatic component (the Cb of former luminance chrominance signal, Cr) promptly do suitable amplification or dwindle (i.e. (Cb ', Cr ')=(33 ,-33)) according to the f value.
I.) adjusted luminance signal (Y ') and carrier chrominance signal (Cb ', Cr ') are changed back rgb signal, output image is finished image processing program.
In embodiments of the present invention, can make static colour image behind this handling procedure, extend significantly with white rank on black rank, dynamic range of images aspect; The image comparison aspect also has more precipitous variation by white rank to black rank.At dynamically playing colour motion picture films continuously, the embodiment of the invention has the significant variation except dynamic range of images and image comparison, picture signal presents more comfortable sense naturally because of level and smooth machine-processed the processing simultaneously when human eye is viewed and admired, the chroma compensation mechanism is also kept image and adjusted front and back tone consistency simultaneously.Owing to calculate and judge the content of LUT in the time of to obtain different images, therefore more meet the purpose that the adaptability color is adjusted.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person of ordinary skill in the field; without departing from the spirit and scope of the invention; when can doing a little change and improvement, so the present invention's protection range is as the criterion when looking the claim person of defining.
Claims (37)
1. the digital picture adaptability color adjusting device of a display is characterized in that comprising:
Analytic unit, receive the YC picture signal, this YC picture signal has brightness composition and colourity composition at least, and the probability distribution figure of this brightness composition of this analytic unit analysis and this YC picture signal of restatement is to obtain weight brightness probability distribution figure;
Dynamic range brightness correspondence table generation unit receives this weight brightness probability distribution figure that this analytic unit is exported, and it is carried out dynamic range extend, to produce dynamic range brightness correspondence table;
Contrast the correspondence table generation unit that highlights, receive this weight brightness probability distribution figure that this analytic unit is exported, it is compared enhancing, contrast the correspondence table that highlights to produce, in order to adjust the image comparison of this brightness composition;
The brightness adjustment unit according to this dynamic range brightness correspondence table and the contrast correspondence table that highlights, is adjusted this brightness composition of this YC picture signal; And
The chroma compensating unit according to the relation between this brightness composition of adjusting front and back, compensates this colourity composition of this YC picture signal.
2. the digital picture adaptability color adjusting device according to claim 1 is characterized in that also comprising signal conversion unit, digital received image signal converted to this YC picture signal of this brightness composition of tool and other composition.
3. the digital picture adaptability color adjusting device according to claim 2 is characterized in that this numeral received image signal is a still image.
4. the digital picture adaptability color adjusting device according to claim 3, it is characterized in that also comprising the inverse signal converting unit, receive this other composition of this YC picture signal that this adjustment back brightness composition that this brightness adjustment unit exported and this signal conversion unit export, do not have an output image signal of brightness composition to produce.
5. the digital picture adaptability color adjusting device according to claim 1 is characterized in that this YC picture signal comprises: YCbCr signal, YUV signal, HSI signal or YPbPr signal.
6. the digital picture adaptability color adjusting device according to claim 1, it is characterized in that the adaptability visually-perceptible of this analytic unit simulation human eye when viewing and admiring image, this probability distribution figure to this brightness composition carries out the Luminance Distribution weight allocation, to obtain this weight brightness probability distribution figure that meets visually-perceptible.
7. the digital picture adaptability color adjusting device according to claim 1, it is characterized in that this dynamic range brightness correspondence table generation unit is defined as the first black rank point digital value and the first white rank point digital value with the dim spot digital value of this weight brightness probability distribution figure and bright spot digital value, to be used to define the second black rank point digital value and the second white rank point digital value of extension dynamic range, wherein this second black rank point digital value is less than this first black rank point digital value, and this second white rank point digital value is greater than this first white rank point digital value, and this second black rank point digital value and this second white rank point digital value are used to produce this dynamic range brightness correspondence table.
8. the digital picture adaptability color adjusting device according to claim 1, the brightness digital value that it is characterized in that adding up this dynamic range brightness correspondence table generation unit the probit value of this weight brightness probability distribution figure reaches first numerical value and second value defines the first black rank point digital value and the first white rank point digital value, to be used to define the second black rank point digital value and the second white rank point digital value of extension dynamic range, wherein this second black rank point digital value is less than this first black rank point digital value, and this second white rank point digital value is greater than this first white rank point digital value, and this second black rank point digital value and this second white rank point digital value are used to produce this dynamic range brightness correspondence table.
9. according to claim 7 or 8 described digital picture adaptability color adjusting devices, it is characterized in that this dynamic range brightness correspondence table calculates and get according to linear interpolation or non-linear interpolation.
10. the digital picture adaptability color adjusting device according to claim 1, the dark-coloured composition probability accumulated value (F1) and light tone composition probability accumulated value (F2) that it is characterized in that highlighting this contrast the correspondence table generation unit calculates this weight brightness probability distribution figure; According to this dead color composition probability accumulated value (F1) and this light tone composition probability accumulated value (F2), this contrast correspondence table that highlights contains more than the different digital value scope first's contrast correspondence table (LUT_CTF1) and second portion contrast correspondence table (LUT_CTF2) construction that highlights that highlights by two groups and forms, and first's contrast correspondence table that highlights contrasts the curve that the correspondence table that highlights comprises four difformities with second portion.
11. the digital picture adaptability color adjusting device according to claim 10, it is characterized in that contrasting the smoothness of curve of the correspondence table that highlights for increase, this contrast highlights the correspondence table generation unit according to this first contrast highlight point of interface of correspondence table (LUT_CTF2) of correspondence table (LUT_CTF1) and this second portion contrast that highlights, and obtains one section fine setting zone and carries out the smoothness of curve fine setting.
12. the digital picture adaptability color adjusting device according to claim 11 is characterized in that the smoothness of curve fine setting in this section fine setting zone can utilize once linear interpolation method or repeatedly linear interpolation mode to carry out.
13. the digital picture adaptability color adjusting device according to claim 1 is characterized in that this chroma compensating unit calculates the chroma compensating factor according to the difference degree between this brightness composition of adjusting front and back, in order to keep the tone consistency of image.
14. the digital picture adaptability color adjusting device according to claim 13, the relation that it is characterized in that this chroma compensating factor and the difference degree of this brightness composition of adjusting front and back can be linear relationship or linear relation repeatedly.
15. the digital picture adaptability color adjusting device of a display is characterized in that comprising:
Signal conversion unit receives first picture signal to convert second picture signal to, and this first picture signal does not have the brightness composition, and this second picture signal has brightness composition and colourity composition at least;
Analytic unit is analyzed the also probability distribution figure of this brightness composition of this second picture signal of weight calculation, to obtain weight brightness probability distribution figure;
Dynamic range brightness correspondence table generation unit receives this weight brightness probability distribution figure that this analytic unit is exported, and it is carried out dynamic range extend, to produce dynamic range brightness correspondence table;
Contrast the correspondence table generation unit that highlights, receive this weight brightness probability distribution figure that this analytic unit is exported, it is compared enhancing, contrast the correspondence table that highlights to produce, in order to adjust the image comparison of this brightness composition;
The smoothness adjustment unit, get this dynamic range brightness correspondence table generation unit produce more than dynamic range brightness correspondence table, level and smooth in addition, to produce level and smooth back dynamic range brightness correspondence table, and get this contrast highlight the correspondence table generation unit produce more than a contrast correspondence table that highlights, in addition level and smooth, to produce the level and smooth back contrast correspondence table that highlights;
The brightness adjustment unit according to this level and smooth back dynamic range brightness correspondence table and the correspondence table that should the contrast of level and smooth back highlights, is adjusted this brightness composition of this second picture signal and is adjusted back brightness composition to produce;
The chroma compensating unit according to the relation between this brightness composition of adjusting front and back, compensates this colourity composition of this second picture signal; And
The inverse signal converting unit receives the compensation back colourity composition and this adjustment brightness afterwards composition of this second picture signal, and to convert output image signal to, this output image signal does not have the brightness composition.
16. the digital picture adaptability color adjusting device according to claim 15 is characterized in that this second picture signal comprises: YCbCr signal, YUV signal, HSI signal or YPbPr signal.
17. the digital picture adaptability color adjusting device according to claim 15 is characterized in that this first picture signal is a dynamic image.
18. the digital picture adaptability color adjusting device according to claim 15, it is characterized in that the adaptability visually-perceptible of this analytic unit simulation human eye when viewing and admiring image, this probability distribution figure to this brightness composition carries out the Luminance Distribution weight allocation, to obtain this weight brightness probability distribution figure that meets visually-perceptible.
19. the digital picture adaptability color adjusting device according to claim 15, it is characterized in that this dynamic range brightness correspondence table generation unit is defined as the first black rank point digital value and rank point digital value in vain with the dim spot digital value of this weight brightness probability distribution figure and bright spot digital value, define second of the dynamic range that is used to extend arbitrarily and deceive the rank point digital value and the second white rank point digital value, wherein this second black rank point digital value is less than this first black rank point digital value, and this second white rank point digital value is greater than this first white rank point digital value, and this second black rank point digital value and this second white rank point digital value are used to produce this dynamic range brightness correspondence table.
20. the digital picture adaptability color adjusting device according to claim 15, the brightness digital value that it is characterized in that adding up this dynamic range brightness correspondence table generation unit the probit value of this weight brightness probability distribution figure reaches first numerical value and second value defines the first black rank point digital value and the first white rank point digital value, to be used to define the second black rank point digital value and the second white rank point digital value of extension dynamic range, wherein this second black rank point digital value is less than this first black rank point digital value, and this second white rank point digital value is greater than this first white rank point digital value, and this second black rank point digital value and this second white rank point digital value are used to produce this dynamic range brightness correspondence table.
21., it is characterized in that this dynamic range brightness correspondence table calculates and get according to linear interpolation or non-linear interpolation according to claim 19 or 20 described digital picture adaptability color adjusting devices.
22. the digital picture adaptability color adjusting device according to claim 15, the dark-coloured composition probability accumulated value (F1) and light tone composition probability accumulated value (F2) that it is characterized in that highlighting this contrast the correspondence table generation unit calculates this weight brightness probability distribution figure; According to this dead color composition probability accumulated value (F1) and this light tone composition probability accumulated value (F2), this contrast correspondence table that highlights contains more than the different digital value scope first's contrast correspondence table (LUT_CTF1) and second portion contrast correspondence table (LUT_CTF2) construction that highlights that highlights by two groups and forms, and first's contrast correspondence table that highlights contrasts the curve that the correspondence table that highlights comprises four difformities with second portion.
23. the digital picture adaptability color adjusting device according to claim 22, it is characterized in that contrasting the smoothness of curve of the correspondence table that highlights for increase, this contrast highlights the correspondence table generation unit according to this first contrast highlight point of interface of correspondence table (LUT_CTF2) of correspondence table (LUT_CTF1) and this second portion contrast that highlights, and obtains one section fine setting zone and carries out the smoothness of curve fine setting.
24. the digital picture adaptability color adjusting device according to claim 23 is characterized in that the smoothness of curve fine setting in this section fine setting zone can utilize once linear interpolation method or repeatedly linear interpolation mode to carry out.
25. the digital picture adaptability color adjusting device according to claim 15 is characterized in that this chroma compensating unit calculates the chroma compensating factor according to the difference degree between this brightness composition of adjusting front and back, in order to keep the tone consistency of image.
26. the digital picture adaptability color adjusting device according to claim 15, wherein the relation of this chroma compensating factor and the difference degree of this brightness composition of adjusting front and back can be linear relationship or linear relation repeatedly.
27. an image adaptability color adjustment method is characterized in that comprising:
The received image signal that to import continuously is converted to continuous YC separation signal, and this YC separation signal contains brightness composition and colourity composition;
Add up the probability distribution figure of this brightness composition, and carry out Adaptive Weight and distribute, to obtain weight brightness probability distribution figure;
This weight brightness probability distribution figure is carried out dynamic range (DR) extend, to obtain dynamic range brightness correspondence table (LUT_DR);
Figure compares enhancing to this weight brightness probability distribution, to obtain contrasting the correspondence table (LUT_CT) that highlights;
This contrast correspondence table that highlights is carried out curve smoothing;
A dynamic range brightness correspondence table addition more than a plurality of brightness composition institute correspondence is average and form the dynamic range brightness correspondence table that is applied to follow-up brightness composition, and the correspondence table addition that highlights of a level and smooth back contrast more than a plurality of brightness composition institute correspondence is average and form the contrast that is applied to this follow-up brightness composition correspondence table that highlights;
According to this dynamic range brightness correspondence table that on average forms and this contrast correspondence table that highlights, this follow-up brightness composition is carried out the brightness adjustment;
According to the brightness composition of adjusting front and back, this colourity composition of this YC separation signal is carried out chroma compensate; And
This YC separation signal to brightness adjustment and chroma compensation back is carried out inverse conversion, to produce continuous output image signal.
28. the method according to claim 27 is characterized in that this YC separation signal comprises: YCbCr signal, YUV signal, HSI signal or YPbPr signal.
29. the method according to claim 27 is characterized in that this step that obtains this weight brightness probability distribution figure comprises: the simulation adaptability visually-perceptible of human eye when viewing and admiring image, this probability distribution figure of this brightness composition is carried out the Luminance Distribution weight allocation.
30. the method according to claim 27, it is characterized in that carrying out dynamic range (DR) extends and comprises with this step that obtains this dynamic range brightness correspondence table (LUT_DR): the dim spot digital value of this weight brightness probability distribution figure and bright spot digital value are defined as the first black rank point digital value and rank point digital value in vain, define second of the dynamic range that is used to extend arbitrarily and deceive the rank point digital value and the second white rank point digital value, wherein this second black rank point digital value is less than this first black rank point digital value, and this second white rank point digital value is greater than this first white rank point digital value, and this second black rank point digital value and this second white rank point digital value are used to produce this dynamic range brightness correspondence table.
31. the method according to claim 27, the brightness digital value that it is characterized in that adding up this dynamic range brightness correspondence table generation unit the probit value of this weight brightness probability distribution figure reaches first numerical value and second value defines the first black rank point digital value and the first white rank point digital value, to be used to define the second black rank point digital value and the second white rank point digital value of extension dynamic range, wherein this second black rank point digital value is less than this first black rank point digital value, and this second white rank point digital value is greater than this first white rank point digital value, and this second black rank point digital value and this second white rank point digital value are used to produce this dynamic range brightness correspondence table.
32., it is characterized in that this dynamic range brightness correspondence table calculates and get according to linear interpolation or non-linear interpolation according to claim 30 or 31 described methods.
33. the method according to claim 27 is characterized in that this weight brightness probability distribution figure is compared enhancing to be comprised to obtain highlight this step of correspondence table (LUT_CT) of this contrast: the dark-coloured composition probability accumulated value (F1) and light tone composition probability accumulated value (F2) that calculate this weight brightness probability distribution figure; According to this dead color composition probability accumulated value (F1) and this light tone composition probability accumulated value (F2), this contrast correspondence table that highlights contains more than the different digital value scope first's contrast correspondence table (LUT_CTF1) and second portion contrast correspondence table (LUT_CTF2) construction that highlights that highlights by two groups and forms, and first's contrast correspondence table that highlights contrasts the curve that the correspondence table that highlights comprises four difformities with second portion.
34. the method according to claim 33, it is characterized in that this contrast this step that correspondence table carries out curve smoothing that highlights is comprised:, obtain one section fine setting zone and carry out the smoothness of curve fine setting according to this first's contrast highlight point of interface of correspondence table (LUT_CTF2) of correspondence table (LUT_CTF1) and this second portion contrast that highlights.
35. the method according to claim 34 is characterized in that the smoothness of curve fine setting in this section fine setting zone can utilize once linear interpolation method or repeatedly linear interpolation mode to carry out.
36. the method according to claim 27 is characterized in that this chroma compensating unit calculates the chroma compensating factor according to the difference degree between this brightness composition of adjusting front and back, in order to keep the tone consistency of image.
37. the method according to claim 27, the relation that it is characterized in that this chroma compensating factor and the difference degree of this brightness composition of adjusting front and back can be linear relationship or linear relation repeatedly.
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| CN102314911A (en) * | 2010-06-29 | 2012-01-11 | 宏达国际电子股份有限公司 | Method and system for adjusting digital signal processing settings of multimedia device |
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