CN1873478A - Image processing apparatus, liquid crystal display apparatus, and color correction method - Google Patents
Image processing apparatus, liquid crystal display apparatus, and color correction method Download PDFInfo
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Abstract
An image processing apparatus has: a frame memory storing a signal of a previous image in a previous one frame, and a correction processing unit configured to receive signals of the previous image and a current image, correct a signal level of the current image based on a difference of signal levels between the previous and current images, execute the correction by applying a first correction mode where a relationship between the signal level of the previous image and an amount of correction of the signal level of the current image is common to three primary colors or a second correction mode for correcting the current image by applying another amount of correction so as to complete an optical response of liquid crystal in the entire primary colors within one frame display period when an input image transits from the previous image to the current image.
Description
Technical field
The present invention relates to proofread and correct other image processing apparatus of present image signal level, liquid crystal indicator and the color correcting method of every kind of object color component based on the signal rank difference between preceding image and present image in the former frame.
Background technology
As graphoscope spare and radiovisor, liquid crystal display device is used just widely.
The change pattern that depends on input voltage, the liquid crystal response of liquid crystal display device may not fully be followed input voltage (driving voltage).
In order to overcome this problem, open (B) No.2616652 of Jap.P. discloses a kind of like this method, this method applies and high signal rank or the corresponding voltage of low signal level when switching the picture signal that will be imported into liquid crystal display device temporarily, thereby quicken to change the arrangement of liquid crystal, this method is commonly referred to as " over-driving method ".
Open (A) No.2002-62850 of Jap.P. discloses a kind of technology, is used for keeping at table the rank of the correction voltage that temporarily applied, for example amount of Jiao Zhenging or amount of overdrive.
Summary of the invention
But, disclosed above-mentioned technology has shortcoming sometimes in one patent disclosure of back, promptly in the pixel triplets that shows by the three primary colours of the color of two or three color mixture, when other rate of change of signal level because of the color different time, specific color will be clearly.
This is that the response characteristic of liquid crystal causes.That is, liquid crystal has such characteristic, promptly liquid crystal be used for color from black, level become other motion of low gray level (gray shade scale) level than from black, level to the high grade grey level level other motion slow, this just causes the difference of the speed of response.Therefore persistence of pattern (picture delay or hysteresis), i.e. specific color situation have clearly just been caused.
With the red continuation that reduces image is that purpose increases and is used for that color is become low other amount of overdrive of gray level level (correcting value) from black, level and can causes for example overshoot usually, thereby produces noise component or lose the high grade grey level effect.On the contrary, cause the Whole Response speed of liquid crystal to reduce from the reduction that black, level becomes the correcting value of high grade grey level rank (for example becoming the red component of light yellow such colour of skin) color to being used for, therefore the general effect that can not obtain to overdrive.
Hope is being avoided when so-called over-driving method improves the response of moving image or is being suppressed to produce persistence of pattern about specific color by using.
According to one embodiment of present invention, provide a kind of processing will be transfused to the image processing apparatus of the image of liquid crystal display device, having comprised:
Frame memory, be used for storing the signal at preceding image of former frame, and correction processing unit, described correction processing unit be configured to receive described at preceding image signal and the signal of present image as input, and the signal rank of proofreading and correct described present image based on described signal rank difference between preceding image and described present image, wherein said correction processing unit by use following both one of carry out described correction: first correction mode, wherein said at preceding image the signal rank and the relation between other correcting value of signal level of described present image be identical for the various colors in the three primary colours, and second correction mode, be used for input picture from described when preceding image transformation is described present image, proofread and correct the present image of at least a color in the three primary colours by using second correcting value different, to finish the optic response of described liquid crystal display device in whole primary colours in the display cycle at a frame with first correcting value of described first correction mode.
Correction processing unit according to the embodiment of the invention can be modified to for every kind in three primary colours color, has the image transitions table, described image transitions table is configured to receive described signal at preceding image and described present image as input, specify signal rank after the correction of described present image by described first correction mode or described second correction mode being applied to a pair of signal rank of being imported at preceding image and the present image imported, and the output result.
Can be modified to according to the correction processing unit of the embodiment of the invention and to have the levels of color comparing unit, described levels of color comparing unit is configured to receive described signal at preceding image and described present image as input, the signal rank of being imported at every kind in three primary colours color comparison at preceding image and the present image imported, and the result selects one of described first correction mode and described second correction mode based on the comparison.
In said circumstances, can be modified to according to the described correction processing unit of the embodiment of the invention and to have the first image transitions table, the described first image transitions table is configured at every kind of color, the present image that to import in selected described first correction mode is converted to the present image that its signal rank is corrected based on signal rank relation identical for three primary colours, and the output result; And the second image transitions table, the described second image transitions table is configured at every kind of color, the present image that to import in selected described second correction mode is converted to its signal rank and uses the present image that described second correcting value is corrected in by at least a color in three primary colours, and the output result.
Perhaps, can be modified to according to the correction processing unit of the embodiment of the invention and to have first and proofread and correct scale, described first proofreaies and correct scale is configured to keep first correcting value at every kind of color, the signal that receives described present image in selected described first correction mode is as input, and corresponding first correcting value of signal rank of the present image of exporting and being imported; The difference correction scale, for at least a color in the three primary colours, described difference correction scale is configured to keep poor between described first correcting value and described second correcting value at every kind of color, and in selected described second correction mode, output is based on the comparative result of described levels of color comparing unit and the color of appointment poor; Adder-subtractor, for at least a color in the three primary colours, described adder-subtractor is configured at every kind of color, to be added to from described first from the difference of described difference correction scale output and proofread and correct described first correcting value of scale output, or deduct poor from described difference correction scale output, and export described second correcting value from described first described first correcting value of proofreading and correct scale output; And totalizer, described totalizer is configured to receive the signal of described present image as input, to proofread and correct described first correcting value of scale output or be added to the present image of being imported from described first at every kind of color, and export signal after the correction of described present image from described second correcting value of described adder-subtractor output.
Perhaps, can be modified to according to the correction processing unit of the embodiment of the invention and to have first and proofread and correct scale, described first proofreaies and correct scale is configured to keep first correcting value at every kind of color, the signal that receives described present image in selected described first correction mode is as input, and at signal rank corresponding first correcting value of every kind of color output with the present image of being imported; Second proofreaies and correct scale, and at least a color in the three primary colours, described second proofreaies and correct scale is configured to keep second correcting value at every kind of color, and exports second correcting value at every kind of color in selected described second correction mode; Switch, described switch is configured to the comparative result based on described levels of color comparing unit, selects described first to proofread and correct one of scale and described second correction scale; And totalizer, described totalizer is configured to receive the signal of described present image as input, add based on the selection result of described switch and described first correcting value or described second correcting value imported at every kind of color, and export signal after the correction of described present image.
Can be modified at the pixel triplets with three primary colours in every kind of average described liquid crystal display device of color according to the levels of color comparing unit of the embodiment of the invention is the signal rank of the adjacent a plurality of pixels in unit, and comes at every kind of more described signal rank of color by using described average signal rank.
Can be modified to according to the correction processing unit of the embodiment of the invention and to have correcting value and generate parts, described correcting value generates in described first correcting value in certain grey level range that parts are configured to keep off and on image and described second correcting value part of each, and generates the correcting value that does not keep by interpolation from the correcting value that is kept.
Provide a kind of liquid crystal indicator according to the embodiment of the invention, having comprised: liquid crystal display device is used for display image; Frame memory, be used for storing the signal at preceding image of former frame, and correction processing unit, described correction processing unit be configured to receive described at preceding image signal and the signal of present image as input, the signal rank of proofreading and correct described present image based on described signal rank difference between preceding image and described present image, and the signal after will proofreading and correct outputs to described liquid crystal display device, wherein said correction processing unit by use following both one of carry out described correction: first correction mode, wherein said at preceding image the signal rank and the relation between other correcting value of signal level of described present image be identical for the various colors in the three primary colours, and second correction mode, be used for input picture from described when preceding image transformation is described present image, proofread and correct the present image of at least a color in the three primary colours by using second correcting value different, to finish the optic response of described liquid crystal display device in whole primary colours in the display cycle at a frame with first correcting value of described first correction mode.
According to the embodiment of the invention, a kind of color correcting method that is used to carry out the colour correction of the image that will be transfused to is provided, may further comprise the steps: want the described image that is transfused at each frame delay, and after ruling out the image section that is transformed to the predetermined color that will be corrected in the image based on the signal rank difference between the preceding image and the present image that will be transfused to and not be delayed that after delay, will be transfused to, proofread and correct color in the image section that is transformed to the described color that will be corrected in the described present image by first correction mode being switched to second correction mode, wherein in described first correction mode, relation between other correcting value of signal level of described signal rank at preceding image and described present image is identical for the various colors in the three primary colours, and described second correction mode is used second correcting value different with first correcting value of described first correction mode at least a color of three primary colours.
According to above configuration, described correction processing unit for example carries out signal rank correction (colour correction) at every kind in three primary colours color by using described first correction mode or described second correction mode.In first correction mode, utilization first identical correcting value for a plurality of primary colours is carried out colour correction.In second correction mode, carry out correction at the correcting value (second correcting value) that at least a color utilization is different with correcting value (first correcting value) another kind of or two kinds of colors in addition.
Such advantage is arranged according to the present invention,, avoid or suppressed to produce persistence of pattern about specific color promptly when using so-called over-driving method and improve the response of moving image.
Description of drawings
Can know the details of the above and other feature of the embodiment of the invention with reference to the accompanying drawings more, in the accompanying drawings:
Fig. 1 shows the block diagram according to the image processing apparatus of first embodiment of the invention;
Fig. 2 shows the block diagram according to the image processing apparatus of second embodiment;
Fig. 3 shows the synoptic diagram of the composition of the first image transitions table;
Fig. 4 shows the block diagram according to the image processing apparatus of the 3rd embodiment;
Fig. 5 shows the block diagram according to the image processing apparatus of the 4th embodiment;
Fig. 6 shows the synoptic diagram that the colour of skin in look post (color cylinder) xsect distributes;
Fig. 7 A shows the synoptic diagram of the display characteristic after first method of application, and Fig. 7 B shows the synoptic diagram of the display characteristic after second method of application; And
Fig. 8 shows will be by the view in average exemplary pixels zone.
Embodiment
More specifically describe according to a preferred embodiment of the invention below with reference to accompanying drawing.Carry out the treatment for correcting of the image that will be transfused to liquid crystal display device according to the image processing apparatus of the embodiment of the invention by using signal in the former frame at the signal of preceding image and the present image that will be corrected.This treatment for correcting is defined as such processing, and it proofreaies and correct the present image signal rank of every kind of color based on the signal rank difference between preceding image and present image.Liquid crystal indicator has each component units of liquid crystal display device and above-mentioned image processing apparatus according to an embodiment of the invention, these component units are configured to that every kind of color of the image that will be transfused to is carried out the signal rank and proofread and correct (colour correction), and the input of the signal after will proofreading and correct liquid crystal display device.
This treatment for correcting comprises first correction mode and second correction mode, and uses one of them execution.
First correction mode is defined as such correction mode, and promptly the relation between other correcting value of signal level of the signal rank of preceding image and present image is identical for every kind of color in red (R), green (G) and blue (B) three primary colours.
Second correction mode is defined as such correction mode, promptly preferably at input picture from when preceding image changes present image into, proofread and correct the present image signal of one of RGB at least by using second correcting value different, thereby finish the optic response of liquid crystal in whole colors in the display cycle at a frame with first correcting value of first correction mode.Notice that in first correction mode, relation is determined, thereby finished the optic response of liquid crystal in whole colors in the display cycle at a frame.
After this exemplary embodiment of the image processing apparatus that can carry out above-mentioned treatment for correcting will be described.
First embodiment
Fig. 1 shows the block diagram of the image processing apparatus of first embodiment.
The image processing apparatus 1A of first embodiment has as the frame memory 2 of memory unit and image replacement storer 3.
Image transitions storer 3 can by (being omitted in the drawings) for example be used for first correction mode image transitions table (the first image transitions table), be used for the image transitions table (the second image transitions table) of second correction mode and be used to select the option table of one of the first image transitions table and second image transitions table to realize.Image transitions storer 3 can have the image transitions table of the every kind of color (for example light yellow so human colour of skin) that is used for being corrected.
Option table is defined as one the table that is used for selecting the first image transitions table, the second image transitions table and other image transitions tables according to certain condition preparation.The selection of his-and-hers watches will be carried out based on each signal rank R (n) among the RGB of current frame image data D (n), G (n) and B (n) and each signal rank R (n-1) in the RGB of prior image frame data D (n-1), G (n-1) and B (n-1).The selection of his-and-hers watches can be carried out by unshowned CPU, perhaps carries out in the mode of the arbitrary image conversion table output enable signal of option table in image transitions table that can be accessed.The mode switch parts are realized by above-mentioned configuration.
Particularly, select the first image transitions table when thinking when having difference hardly between danger signal rank R (n) that each is right and R (n-1), green rank G (n) and G (n-1) and blue signal rank B (n) and the B (n-1).
When the signal rank difference from each RGB between prior image frame and current frame image detect from black, level or other low signal level be clipped to the color (the light yellow so human colour of skin for example current embodiment) that will be corrected signal level other when changing, the second image transitions table that is used for correct skin tones is selected.If there are other colors that will be corrected, another image transitions table that then is used to proofread and correct this color can be selected in the same way.
Be set to certain value from the signal rank of each RGB of second image transitions table output, so that be transfused to LCD (LCD) driver 11 when driving LCD panel (liquid crystal display device) 10 when this signal, required color is shown in the display cycle fully at a frame in current frame image.
Note, the signal rank of the signal of first image transitions table output is identical for each rgb color, this is the same with the mode of over-driving method of the prior art, this signal rank is set to certain value, so that when this signal was transfused to lcd driver 11 with driving LCD panel 10, required color was shown in the display cycle fully at a frame in current frame image.
In first embodiment, the selection of first correction mode and second correction mode is carried out by option table.
On the contrary, among second to the 4th embodiment below, provide the levels of color comparer to come substitution list to carry out selection function.
Second embodiment
Fig. 2 is the block diagram of the image processing apparatus of second embodiment.
The image processing apparatus 1B of second embodiment has frame memory 2 and as levels of color comparer 4, the first image transitions table 31 of mode switch parts, and the second image transitions table 32.
Levels of color comparer 4 is that the unit is received in prior image frame data D (n-1) and current frame image data D (n) as input with the pixel triplets of RGB, at the signal rank of each color comparison at prior image frame and current frame image, and whether the detected image conversion be the change to the color that will be corrected, thus perhaps based on the signal rank change amount of every kind of color and signal level range detect whether comprise certain color except specific color signal level other change in image transformation, to be delayed and cause specific color to be emphasized such possibility.In addition, based on detected result, when specific color becomes clearly after image transformation at once, comparer 4 outputs to the second image transitions table 32 with current frame image data D (n) with in prior image frame data D (n-1) data, otherwise when it was not obvious, comparer 4 outputed to the first image transitions table 31 with current frame image data D (n) with in prior image frame data D (n-1) data.
The brightness transition of first correction mode (view data conversion) is carried out by the first image transitions table 31 pair every kind of color, and the conversion of the view data of second correction mode is carried out by the second image transitions table 32.Current frame image data D after the conversion
New(n) be output to lcd driver 11, LCD panel 10 comes display image based on the output data (signal) from lcd driver 11.
Fig. 3 shows the composition of the first image transitions table 31.
Among the figure, the image of each RGB (pixel) data-signal is assumed to be the signal of 8 bit data, and various colors show not with decimal number 0 to 255 indicated 256 gray levels (gray shade scale).
In this case, may need to be used to import the table of 16 bit data, so as from 256 gray levels specify gray level after proofreading and correct at the present frame of preceding frame and 256 gray levels, but its memory capacity may be excessive.Therefore, when hypothesis was carried out interpolation and handled, the pixel data with the gray level that has reduced was stored among Fig. 3.Be used for carrying out the device (being omitted) that interpolation handles and for example be provided at the input side of lcd driver 11, and can handle by interpolation and produce the entire frame image at Fig. 2.Any means in straight-line interpolation, 3 interpolations and other linear interpolations or the non-linear interpolation all can be used as interpolating method.
The first image transitions table 31 shown in Figure 3 all is identical for RGB is of all kinds, when the signal rank of present frame is lower than signal rank at preceding frame, its signal rank with present frame is converted to other signal class value of signal level that is lower than present frame, otherwise, when the signal rank that is higher than at preceding frame, its signal rank with present frame transfers other signal class value of signal level that is higher than present frame to.
In Fig. 3, for example when being assumed to be " 128 " in the signal rank of preceding frame, and the signal rank of present frame is when being " 160 ", and other data of signal level " 172 " that are higher than present frame are designated, and are output as signal rank after the correction of present frame.Correcting value under this situation (after this being called " first correcting value ") becomes " 12 (=172-160) ".
Notice that when the signal rank at preceding frame was minimum value 0, data 0 were held, and did not rely on the signal rank at preceding frame, when the signal rank at preceding frame was maximal value " 255 ", data " 255 " were held.
The second image transitions table 32 (its details is omitted) is defined as such table, and it is corrected the image transitions table 31 (Fig. 3) of winning, thereby specific color can be not clearly in the whole combination of gray level.Hereinafter, the correcting value of correction is called as " second correcting value ", and the difference between second correcting value and first correcting value is called as " difference correction amount ".
The 3rd embodiment
Fig. 4 is the block diagram of the image processing apparatus of the 3rd embodiment.
The image processing apparatus 1C of the 3rd embodiment has frame memory 2 and levels of color comparer 4A, also have first and proofread and correct scale 51, difference correction scale 50, red (R) adder-subtractor 6r and redness (R) totalizer 7r, green (G) adder-subtractor 6g and green (G) totalizer 7g, and blue (B) adder-subtractor 6b and blueness (B) totalizer 7b.
Levels of color comparer 4A is that the unit is received in prior image frame data D (n-1) and current frame image data D (n) as input with the pixel triplets of RGB, at the signal rank of each color comparison at prior image frame and current frame image, and whether the detected image conversion comprise the change to the color that will be corrected, thus perhaps based on the signal rank change amount of every kind of color and signal level range detect whether comprise certain color except specific color signal level other change in image transformation, to be delayed and cause specific color to be emphasized such possibility.In addition, based on detected result, when specific color becomes clearly after image transformation, comparer 4A will comprise that the signal S4A of difference information outputs to difference correction scale 50, otherwise when it was not obvious, comparer 4 was not exported this information at once.Under every kind of situation, levels of color comparer 4A outputs to the first image transitions table 51 with current frame image data D (n) with at prior image frame data D (n-1).
The first image transitions table 51 is specified the correcting value (first correcting value) of first correction mode based on the signal rank at every kind of color of prior image frame data D (n-1) and the current frame image data D (n) that imports of input, this correcting value all is identical for every kind of color of RGB, and exports this correcting value.That is, outputed to R adder-subtractor 6r, G adder-subtractor 6g and B adder-subtractor 6b respectively from first correction scale 51, the first redness (R) the correcting value Lr1, first green (G) correcting value Lg1 and first blueness (B) correcting value Lb1.
In first correction mode, adjusting (plus-minus of difference correction amount) to the correcting value of unclear specific color is unnecessary, therefore a R correcting value Lr1, a G correcting value Lg1 and a B correcting value Lb1 pass through adder- subtractor 6r, 6g and 6b, and are transfused to R totalizer 7r, G totalizer 7g and B totalizer 7b.
In addition, in second correction mode, comprise that the signal S4A of difference information is imported into difference correction scale 50, this difference correction scale 50 is specified the difference correction amount of every kind of color based on the signal S4A that comprises difference information, and exports the result.That is, from difference correction scale 50, red (R) difference correction amount Δ Lr, green (G) difference correction amount Δ Lg and blueness (B) difference correction amount Δ Lb are output to R adder-subtractor 6r, G adder-subtractor 6g, and B adder-subtractor 6b.
In R adder-subtractor 6r, R difference correction amount Δ Lr is added to a R correcting value Lr1 or deducts from a R correcting value Lr1, and the result is transfused to R totalizer 7r as the 2nd R correcting value Lr2.In above-mentioned same mode, in G adder-subtractor 6g, G difference correction amount Δ Lg is added to a G correcting value Lg1 or deducts from a G correcting value Lg1, and the result is transfused to G totalizer 7g as the 2nd G correcting value Lg2.In addition, in B adder-subtractor 6b, B difference correction amount Δ Lb is added to a B correcting value Lb1 or deducts from a B correcting value Lb1, and the result is transfused to B totalizer 7b as the 2nd B correcting value Lb2.About each adder-subtractor is to carry out addition process or the control information of subtraction process can be included in the difference correction amount that will be transfused to, and is perhaps received separately as the input from levels of color comparer 4A.
The current frame image data D (n) of various colors is imported into totalizer 7r, 7g and 7b, is added to the second correcting value Lr2, Lg2 and Lb2, thereby is converted into new current frame image data D
New(n).
Current frame image data D after the conversion
New(n) be output to lcd driver 11, image is shown on LCD panel 10 based on the output from lcd driver 11.
The 4th embodiment
Fig. 5 shows the block diagram of the image processing apparatus of the 4th embodiment.
The something in common of the 4th embodiment and the 3rd embodiment is the basic operation that correcting value is added to current frame image data D (n), with the difference of the 3rd embodiment be the mode that generates correcting value.That is, in the 4th embodiment, second correcting value is not that the plus-minus method by the difference correction amount generates, but generate by the table that keeps the result.First correcting value and second correcting value utilize switch to switch.
As the configuration that is used to carry out aforesaid operations, image processing apparatus 1D shown in Fig. 5 has second and proofreaies and correct scale, be used to replace difference correction scale 50 shown in Figure 4, also have switch 8r, the 8g and the 8b that are used for every kind of color, switch 8r, 8g and 8b are used to replace adder- subtractor 6r, 6g and 6b shown in Figure 4 as mode selector switch.
The levels of color comparer 4B of present embodiment is identical with the basic operation of levels of color comparer 4A shown in Figure 4, difference has been to export and has been used to control switch 8r, the 8g of every kind of color and the switching signal S4B of 8b, and the current frame image data D (n) of RGB and be output to second at prior image frame data D (n-1) and proofread and correct scale 52.
Second proofread and correct scale 52 based on the current frame image data D (n) of the input of every kind of color and import at prior image frame data D (n-1), specify the correcting value of second correction mode for every kind of color, this correcting value is identical for each color of RGB, and the output result.That is, outputed to redness (R) switch 8r, green (G) switch 8g and blueness (B) switch 8b respectively from the second correction scale, 52, the two R correcting value Lr2, the 2nd G correcting value Lg2 and the 2nd B correcting value Lb2.
Each switch control among switch 8r, 8g and the 8b is independent output first correcting value or second correcting value in RGB.Therefore, the correcting value of exporting by switch is added to each color data of current frame image data D (n) by totalizer 7r to 7b, thereby generates the new current frame image data D of every kind of color
NewAnd this new current frame image data D of imagery exploitation (n),
New(n) be shown.Therefore, specific color is corrected, thereby the continuation of image is unconspicuous, and in addition, other colors are corrected by the tone of regulating whole pixel triplets, thereby are different from required color slightly where necessary.
Below with reference to the flesh correction in the display image conversion from the black, level to the colour of skin, the processing example of the occurrence example implementation of utilizing levels of color comparer, first correcting value, second correcting value and difference correction amount is described.
The processing example of levels of color comparer
In levels of color comparer 4 (Fig. 2), 4A (Fig. 4), 4B (Fig. 5), at each rgb pixel tlv triple, the present frame that is corrected (n) being compared in preceding frame (n-1) data (at prior image frame data D (n-1)) and present frame (n) data (current frame image data D (n)) before, this more sometimes can be more sparse.
Whether result based on the comparison carries out about being judgements of black, level in preceding frame (n-1) data.
An example as the condition of above-mentioned judgement, when the whole pixel data of each RGB is included in the low scope of 0 to 255 256 gray levels (for example 0 to 32 this scope), whether present frame (n) data of then adjudicating in this pixel triplets are included in the black, level.
Whether about present frame (n) data are included in for example light yellow such colour of skin or near the judgement in the Color Range of the colour of skin in formation.Two examples that below explanation are used for the condition of this judgement.
In first condition example, the colour of skin or the Color Range that comprises the colour of skin be in any two or three color from present frame (n) data signal rank difference or from its combination appointment.When the standard value of the colour of skin for example is assumed to be (R in 256 gray levels, G, B)=(250,200,96) time, the Color Range that comprises the colour of skin is whether by poor (R-B) between maximum signal level R and the minimum signal rank B is included in about scope of 150 to 60 and is detected.In addition, when wanting detected Color Range to be restricted to the colour of skin, then above-mentioned color difference (R-B) is made up with another color difference (R-G) and/or (G-B), comprises the Color Range of the colour of skin with restriction.
In the second condition example, HSV (tone, saturation degree and value) conversion is employed, and it preferably is applied to detecting more accurately the colour of skin.The RGB data are carried out the HSV conversion, thereby relatively easily realize colour of skin judgement.
In the HSV conversion, the look post that is similar to Mang Saier (Munsell) colour solid is extracted and is employed from the RGB data.
Fig. 6 shows the distribution of the colour of skin in the look column section.
In the drawings, each color data among the RGB all in 0 to 1 scope by standardization, value V is 0 to 1, tone H be 0 to 360 the degree, saturation degree S is 0 to 1.Notice that though the scale of tone H and saturation degree S as shown in the figure, the scale that is worth V is perpendicular to paper, the point that therefore is worth the dispersion of V is overlapping, and does not indicate the value of its vertical direction.
(B), value V and saturation degree S express by following formula (1-1) with (1-2) for R, G, and tone H is expressed by following formula (2-1) to (2-3) by using each color data.The condition of tone H is set to 6≤H≤8 in this case, and the colour of skin can be designated.
(formula 1)
V＝
max(R，G，B) ...(1-1)
S＝(V-X)/V ...(1-2)
X=wherein
Min(R, G, B).
(formula 2)
When R=V, H=(pi/3) * (b-g) ... (2-1)
When G=V, H=(pi/3) * (2+r-b) ... (2-2)
When B=V, H=(pi/3) * (4+g-r) ... (2-3)
Wherein, r=(V-R)/(V-X),
G=(V-G)/(V-X), and
b＝(V-B)/(V-X)。
In judging that present frame (n) data are included in by the colour of skin or the Color Range near the colour of skin of using the said method appointment, and when preceding frame (n-1) data are included in the black, level, each levels of color comparer 4,4A and 4B select second correction mode, otherwise these comparers are selected first correction mode.
The sample calculation of amount of overdrive (correcting value)
The sample calculation of the correcting value of using when preparing the second correction scale 52 shown in Figure 5 (second correcting value) will be described below.
For every kind of rgb color, be assumed to be 0 at preceding frame (n-1) pixel data, be 192 and present frame (n) pixel data is assumed to be R, G is 160, B is 64.In this case, first correcting value of each among the RGB becomes Lr1 and is+37 (=229-192), Lg1 is+40 (=200-160), Lb1 is+26 (=90-64).Each difference correction amount Δ Lr of RGB, Δ Lg, Δ Lb for example prepare by following method under the following conditions, described condition is: when image during with the RGB data presentation after proofreading and correct, other conversion time of the signal level in the display panels is at a frame within the display cycle.
In first method, shown in Fig. 7 A, the amount of overdrive (first correcting value) with blueness of longest response time is increased.
Difference correction amount Δ Lb as the amount that will be increased prepares by predetermined formula, and this formula for example is (R-B)/b, and wherein b is the suitable integer more than or equal to 2.When this formula is applied to for example supposing that b is 4, R is 192, and B is 64 o'clock, then B difference correction amount Δ Lb=(192-64)/4=+32.In Fig. 4, result " 32 " is a R correcting value Lr1 of+26 by the B adder-subtractor 6b value of being added to.Therefore, the 2nd B correcting value Lb2 become 58 (=26+32).
Therefore, the liquid crystal optical response of B pixel is increased in the pixel triplets, and therefore the amount of red composition is reduced relatively, so the red continuation of image is not obvious.In this case, for for example color balance of light yellow such colour of skin, green and red difference correction amount Δ Lg and Δ Lb can by use other suitable formula be set to some on the occasion of.
B difference correction amount Δ Lb prepares with the color beyond color R=192, G=160, the B=64 among Fig. 3 in an identical manner, and if necessary, the difference correction amount of R and G also is prepared.In this case, the value of b can be changed suitably.Notice that when the value of formula (R-B)/b became negative, it was fixed to 0.
Therefore, finished the formation of difference correction scale 50 shown in Figure 4.Prepare the second correction scale 52 shown in Figure 5 by first correcting value being added to ready difference correction amount.
In second method, different with first method shown in Fig. 7 B, the amount of overdrive that is used for obvious color redness is reduced.
R difference correction amount Δ Lr prepares by predetermined formula, and this formula for example is (R-B)/b, and wherein b is the suitable integer more than or equal to 2.In second method, by R adder-subtractor 6r shown in Figure 4, R difference correction amount Δ Lr is deducted from a R correcting value Lr1.
Notice that the mode identical with first method considered color balance, other difference correction amounts for example Δ Lg and Δ Lb can be set to some value, and these values are deducted from each first correcting value.In having the blue pixel of minimum response, at the optic response of liquid crystal under the condition that a frame was finished in the display cycle, if this condition is not satisfied, then difference correction amount can be set to not change 0 of first correcting value, otherwise the difference correction amount can be added to first correcting value.
By making up first method and second method is used third party's method.
Owing to detect based on color information amount of overdrive is controlled, therefore in television image in the image information of the frequent colour of skin that shows, can reduce the red continuation of the image that in the motion of the image that for example comprises light yellow such human colour of skin, produces.
Particularly, when increasing blue amount of overdrive, amount of overdrive (if promptly the red continuation of image can be reduced (second correction mode)) only where necessary increases, otherwise under other situations, the control of overdriving of the prior art is employed (first correction mode).Therefore, picture quality is enhanced.
When reducing red amount of overdrive, amount of overdrive (if promptly the red continuation of image can be reduced (second correction mode)) only where necessary reduces, otherwise under other situations, the control of overdriving of the prior art is employed (first correction mode).Therefore, picture quality is enhanced.
In the above description, Fig. 1 is that the unit is carried out to whole processing shown in Figure 5 (for example levels of color comparison, first and second correcting values are calculated, the difference correction amount is calculated, is used to calculate the plus-minus method of second correcting value, and the plus-minus method that is used to generate new pixel data) with the pixel triplets of three primary colours.
Notice that this unit is the pixel data of the various colors of three primary colours preferably, described pixel data is comprising that the zone that is arranged in pixel triplets a plurality of pixel triplets on every side that will be corrected is by average.
Fig. 8 shows that be defined as will be by the zone of 3 * 3 pixel triplets of average pixel region.Average treatment is carried out in advance by unshowned CPU.
In the above described manner, each rgb color is applied to judgement to the colour of skin by average pixel data, so noise component can be suppressed, and flase drop is surveyed and can be avoided.Therefore can aspect the raising of Face Detection accuracy, obtain benefit.
It will be understood by those of skill in the art that in the scope of claims or its equivalent and can make various modifications, combination, sub-portfolio and replacement according to design needs and other factors.
The cross reference of related application
The present invention comprises the theme of the Japanese patent application No.2006-82617 that submits to Jap.P. office in the Japanese patent application No.2005-161688 that relates on June 1st, 2005 and submit to Jap.P. office and on March 24th, 2006, and the full content of these two applications is contained in this by reference.
Claims (12)
1. a processing will be transfused to the image processing apparatus of the image of liquid crystal display device, comprising:
Frame memory is used for storing the signal at preceding image of former frame, and
Correction processing unit, described correction processing unit be configured to receive described at preceding image signal and the signal of present image as input, and the signal rank of proofreading and correct described present image based on described signal rank difference between preceding image and described present image
Wherein said correction processing unit by use following both one of carry out described correction:
First correction mode, wherein said at preceding image the signal rank and the relation between other correcting value of signal level of described present image be identical for the various colors in the three primary colours, and
Second correction mode, be used for input picture from described when preceding image transformation is described present image, proofread and correct the present image of at least a color in the three primary colours by using second correcting value different, to finish the optic response of described liquid crystal display device in whole primary colours in the display cycle at a frame with first correcting value of described first correction mode.
2. image processing apparatus as claimed in claim 1, wherein for every kind in three primary colours color, described correction processing unit comprises the image transitions table, described image transitions table is configured to receive described signal at preceding image and described present image as input, specify signal rank after the correction of described present image by described first correction mode or described second correction mode being applied to a pair of signal rank of being imported at preceding image and the present image imported, and the output result.
3. image processing apparatus as claimed in claim 1, wherein said correction processing unit comprises the levels of color comparing unit, described levels of color comparing unit is configured to receive described signal at preceding image and described present image as input, the signal rank of being imported at every kind in three primary colours color comparison at preceding image and the present image imported, and the result selects one of described first correction mode and described second correction mode based on the comparison.
4. image processing apparatus as claimed in claim 3, wherein said correction processing unit also comprises
The first image transitions table, the described first image transitions table is configured at every kind of color, the present image that to import in selected described first correction mode is converted to the present image that its signal rank is corrected based on signal rank relation identical for three primary colours, and the output result, and
The second image transitions table, the described second image transitions table is configured at every kind of color, the present image that to import in selected described second correction mode is converted to its signal rank and uses the present image that described second correcting value is corrected in by at least a color in three primary colours, and the output result.
5. graphics processing unit as claimed in claim 3, wherein said correction processing unit comprises
First proofreaies and correct scale, described first proofreaies and correct scale is configured to keep first correcting value at every kind of color, the signal that receives described present image in selected described first correction mode is as input, and at signal rank corresponding first correcting value of every kind of color output with the present image of being imported;
The difference correction scale, for at least a color in the three primary colours, described difference correction scale is configured to keep poor between described first correcting value and described second correcting value at every kind of color, and in selected described second correction mode, output is based on the comparative result of described levels of color comparing unit and the color difference of appointment;
Adder-subtractor, for at least a color in the three primary colours, described adder-subtractor is configured at every kind of color, to be added to from described first from the difference of described difference correction scale output and proofread and correct described first correcting value of scale output, or deduct poor from described difference correction scale output, and export described second correcting value from described first described first correcting value of proofreading and correct scale output; And
Totalizer, described totalizer is configured to receive the signal of described present image as input, to proofread and correct described first correcting value of scale output or be added to the signal of the present image of being imported from described first at every kind of color, and export signal after the correction of described present image from described second correcting value of described adder-subtractor output.
6. image processing apparatus as claimed in claim 3, wherein said correction processing unit comprises
First proofreaies and correct scale, described first proofreaies and correct scale is configured to keep first correcting value at every kind of color, the signal that receives described present image in selected described first correction mode is as input, and at signal rank corresponding first correcting value of every kind of color output with the present image of being imported;
Second proofreaies and correct scale, and at least a color in the three primary colours, described second proofreaies and correct scale is configured to keep second correcting value at every kind of color, and exports second correcting value at every kind of color in selected described second correction mode;
Switch, described switch is configured to the comparative result based on described levels of color comparing unit, selects described first to proofread and correct one of scale and described second correction scale; And
Totalizer, described totalizer is configured to receive the signal of described present image as input, add based on the selection result of described switch and described first correcting value or described second correcting value imported at every kind of color, and export signal after the correction of described present image.
7. image processing apparatus as claimed in claim 3, wherein said levels of color comparing unit is the signal rank of the adjacent a plurality of pixels in unit at the pixel triplets with three primary colours in every kind of average described liquid crystal display device of color, and comes at every kind of more described signal rank of color by using described average signal rank.
8. image processing apparatus as claimed in claim 1, wherein said correction processing unit comprises that correcting value generates parts, described correcting value generates in described first correcting value in certain grey level range that parts are configured to keep off and on image and described second correcting value part of each, and generates the correcting value that does not keep by interpolation from the correcting value that is kept.
9. liquid crystal indicator comprises:
Liquid crystal display device is used for display image;
Frame memory is used for storing the signal at preceding image of former frame, and
Correction processing unit, described correction processing unit be configured to receive described at preceding image signal and the signal of present image as input, the signal rank of proofreading and correct described present image based on described signal rank difference between preceding image and described present image, and the signal after will proofreading and correct outputs to described liquid crystal display device
Wherein said correction processing unit by use following both one of carry out described correction:
First correction mode, wherein said at preceding image the signal rank and the relation between other correcting value of signal level of described present image be identical for the various colors in the three primary colours, and
Second correction mode, be used for input picture from described when preceding image transformation is described present image, proofread and correct the present image of at least a color in the three primary colours by using second correcting value different, to finish the optic response of described liquid crystal display device in whole primary colours in the display cycle at a frame with first correcting value of described first correction mode.
10. liquid crystal indicator as claimed in claim 9, wherein said correction processing unit comprises the image transitions table, described image transitions table is configured to receive described signal at preceding image and described present image as input, specify signal rank after the correction of described present image by described first correction mode or described second correction mode being applied to a pair of signal rank of being imported at preceding image and the present image imported, and at every kind in three primary colours color output result.
11. liquid crystal indicator as claimed in claim 9, wherein said correction processing unit comprises the levels of color comparing unit, described levels of color comparing unit is configured to receive described signal at preceding image and described present image as input, the signal rank of being imported at every kind in three primary colours color comparison at preceding image and the present image imported, and the result selects one of described first correction mode and described second correction mode based on the comparison.
12. a color correcting method that is used to carry out the colour correction of the image that will be transfused to may further comprise the steps:
Want the described image that is transfused at each frame delay, and
After ruling out the image section that is transformed to the predetermined color that will be corrected in the image based on the signal rank difference between the preceding image and the present image that will be transfused to and not be delayed that after delay, will be transfused to, proofread and correct color in the image section that is transformed to the described color that will be corrected in the described present image by first correction mode being switched to second correction mode, wherein in described first correction mode, relation between other correcting value of signal level of described signal rank at preceding image and described present image is identical for the various colors in the three primary colours, and described second correction mode is used second correcting value different with first correcting value of described first correction mode at least a color of three primary colours.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005-161688 | 2005-06-01 | ||
| JP2005161688 | 2005-06-01 | ||
| JP2005161688 | 2005-06-01 | ||
| JP2006082617 | 2006-03-24 | ||
| JP2006-082617 | 2006-03-24 |
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| CN1873478A true CN1873478A (en) | 2006-12-06 |
| CN100428783C CN100428783C (en) | 2008-10-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339759B (en) * | 2007-07-05 | 2011-01-26 | 索尼株式会社 | Image processing apparatus, image processing method, and computer program |
| CN102543006A (en) * | 2010-12-13 | 2012-07-04 | 康耀仁 | Compensation display device, compensation method and compensation circuit |
| CN101739965B (en) * | 2008-11-07 | 2013-02-13 | 奇美电子股份有限公司 | Driving method of liquid crystal panel and liquid crystal display |
| CN110519493A (en) * | 2013-05-08 | 2019-11-29 | 索尼公司 | Imaging device and imaging method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002271802A (en) * | 2001-03-14 | 2002-09-20 | Sony Corp | Image processing method and image pickup device |
| JP3686869B2 (en) * | 2002-02-06 | 2005-08-24 | Ｎｅｃ液晶テクノロジー株式会社 | Liquid crystal display device and signal correction circuit thereof |
| JP3630149B2 (en) * | 2002-06-14 | 2005-03-16 | カシオ計算機株式会社 | Imaging apparatus, white balance control method, and white balance control program |
| JP4439832B2 (en) * | 2003-03-24 | 2010-03-24 | 独立行政法人科学技術振興機構 | Image acquisition method |
| JP4315748B2 (en) * | 2003-07-07 | 2009-08-19 | オリンパス株式会社 | Endoscope device |
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2006
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339759B (en) * | 2007-07-05 | 2011-01-26 | 索尼株式会社 | Image processing apparatus, image processing method, and computer program |
| CN101739965B (en) * | 2008-11-07 | 2013-02-13 | 奇美电子股份有限公司 | Driving method of liquid crystal panel and liquid crystal display |
| CN102543006A (en) * | 2010-12-13 | 2012-07-04 | 康耀仁 | Compensation display device, compensation method and compensation circuit |
| CN110519493A (en) * | 2013-05-08 | 2019-11-29 | 索尼公司 | Imaging device and imaging method |
| CN110519493B (en) * | 2013-05-08 | 2021-04-16 | 索尼公司 | Image processing apparatus, image processing method, and computer-readable recording medium |
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