CN101105907A - Plasma display apparatus and image processing method thereof - Google Patents
Plasma display apparatus and image processing method thereof Download PDFInfo
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Abstract
A plasma display device and an image processing method thereof are provided to enhance image quality by reducing a false contour noise and removing a half-tone noise from a displayed image. An inverse-gamma compensator processes an external image signal. A grayscale value divider divides a first grayscale value of the image signal from the inverse-gamma compensator into second and third grayscale values. The second grayscale value corresponds to a non-low grayscale value sub-field, while the third grayscale value corresponds to a low grayscale value sub-field. A first sub-field mapping unit maps the second grayscale value to a first sub-field mapping code. A second sub-field mapping unit maps the third grayscale value to a second sub-field mapping code. A sub-field mapping code collector collects the first and second sub-field mapping codes and generates a sub-field mapping code corresponding to one frame.
Description
One, technical field
The invention relates to plasma display system, more specifically say, is a kind of plasma display system and image processing method thereof that can improve the image quality of demonstration.
Two, background technology
General Plasmia indicating panel comprises: the Plasmia indicating panel of being made of a unit cell (cell) the interlayer that forms between front substrate and back substrate.Filled neon (Ne) in each cell (cell), helium (He), or the mixed gas of neon and helium main discharge gases such as (Ne+He) and the inert gas that contains xenon on a small quantity.When the HF voltage guiding discharge, inert gas produces vacuum ultraviolet (Vacuum Ultraviolet ray), makes the light-emitting phosphor that forms between interlayer, display frame.Aforesaid plasma display system has not only light but also thin structure, attracts tremendous attention as display device of new generation.
Fig. 1 is the method for displaying image synoptic diagram of general plasma display system.
As shown in Figure 1, plasma display system is divided into the different a plurality of subdomains (sub-field) of number of light emission times during with a frame (frame), during the subdomain (sub-field) of GTG value corresponding to the picture signal of input, make Plasmia indicating panel luminous, thus display image.
Each subdomain (sub-field) is divided into: the reseting period that balancedly produces discharge; Select during the location of discharge cell (cell); And during showing keeping of GTG according to discharge time.For example, when using 256 GTG display images in advance, will be equivalent to 1/60 second frame (frame) during (16.67ms) be divided into 8 subdomains (sub-field).
Simultaneously, 8 subdomains (sub-field) are divided into respectively: reseting period, during the location and during keeping.Wherein, during keeping in each subdomain (sub-field), with 2
nThe ratio of (n=0,1,2,3,4,5,6,7) increases.As mentioned above, different during the keeping in each subdomain (sub-field), thereby, GTG (Gray level) that can display image.That is,, keep number of pulses, then, use the number of pulses sum of keeping of the subdomain of opening by the method for each subdomain of On/Off (sub-field) (sub-field) to show GTG to each subdomain (sub-field) distribution according to certain principle.Wherein, to be called subdomain mapping (sub-field mapping) according to the process that the GTG value is selected to open (turn-on) or closed the subdomain (sub-field) of (turn-off), the data that will comprise above-mentioned information are called subdomain mapping code (sub-field mapping code).
Subdomain mapping (sub-field mapping) method is diversified method.For example, according to subdomain (sub-field) quantity of using, there is very diversified method in actual gray quantity.Wherein, actual gray refers to the GTG that shows through subdomain mapping (sub-field mapping), is the GTG that shows without Flame Image Process.When driving plasma display system, if use a large amount of actual gray, then mobile image will occur, or when user's moving-vision, will occur the false contour noises such as lines (false Contour noise) of white or black between specific adjacent GTG.
In the prior art, in order to remove above-mentioned false contour noise (false Contour noise), and use a small amount of actual gray, and the GTG value between actual gray adopts the semitone (half tone) that utilizes shake (Dithering) or error diffusion (error diffusion) to handle and the method for filling.Shake (Dithering) method is described following Fig. 2.
Fig. 2 is in the prior art, the shake of plasma display system (Dithering) method synoptic diagram.
As shown in Figure 2, shake (Dithering) method is that the GTG value of each pixel (pixel) is compared with the specified threshold (threshold) of dither mask, judges whether the method for carry (carry).At this moment, open the pixel (pixel) that carry takes place (on), close the pixel (pixel) that carry does not take place (off), thereby improve the display capabilities of not enough GTG.Again, shake (Dithering) method is to bear to add suitable noise, thus the method that false contouring (false contour) is thickened.For example, as shown in Figure 2, alternately use a plurality of frames (frame) of plasma display system, a plurality of dither mask pattern of a plurality of row and a plurality of row correspondences.
On the one hand, in shake (Dithering) method, will dither maskpattern shown in Figure 2 is shown as lines (pattern) in image shake (Dithering) noise appear.Especially, when exceedingly reducing the quantity of actual gray, along with utilizing semitone (half tone) to handle the increase of the GTG value quantity of filling, shake (Dithering) noise will appear.Again, error diffusion (error diffusion) is that the error percentage that takes place in will certain pixel (pixel) diffuses to the method in the neighbor (pixel).Aforesaid, error diffusion (errordiffusion) is when exceedingly reducing the quantity of actual gray, and the direction that error diffusion (errordiffusion) also will occur is shown as the error diffusion noise of lines (pattern) (error diffusion noise).
Three, summary of the invention
In view of this, the object of the present invention is to provide the plasma display system and the image processing method thereof of the semitone noise (halftone noise) in a kind of image that reduces demonstration.
Again, the object of the present invention is to provide and a kind ofly in the image that shows, remove in the semitone noise (halftonenoise), can reduce plasma display system and the image processing method thereof of false contour noise (false Contour noise).
The object of the present invention is to provide a kind of plasma display system and image processing method thereof that in the image that shows, improves GTG display capabilities and GTG linearity again.
For solving above-mentioned problem, plasma display system among the present invention the 1st embodiment comprises: contrary gamma compensated (the reverse gamma compensation) portion that the picture signal of outside input is carried out contrary gamma compensated (reverse gamma compensation); The 1st GTG value with the picture signal of above-mentioned contrary gamma compensated (reverse gammacompensation) portion input, be divided into the 2nd GTG value of mapping (mapping) to the non-low GTG subdomain (sub-field), with the GTG value cutting part of the 3rd GTG value of mapping (mapping) to the low GTG subdomain (sub-field); Above-mentioned the 2nd GTG value mapping (mapping) is shone upon (sub-field mapping) portion to the 1st subdomain on the 1st subdomain mapping code (sub-field mapping code); Above-mentioned the 3rd GTG value mapping (mapping) is shone upon (sub-field mapping) portion to the 2nd subdomain on the 2nd subdomain mapping code (sub-field mapping code); And comprehensive above-mentioned the 1st subdomain shines upon code (sub-field mapping code) and above-mentioned the 2nd subdomain shines upon code (sub-field mapping code), and the subdomain that generates the subdomain mapping code (sub-field mapping code) that is equivalent to a frame (frame) shines upon code (sub-field mapping code) Synthesis Department.
Above-mentioned GTG value cutting part, comprise: storage in advance will be shone upon (mapping) and will be made as the 1st threshold value (threshold) to the GTG value that above-mentioned the 1st subdomain shines upon code (sub-field mapping code), will shine upon (mapping) is made as threshold value (threshold) information of the 2nd threshold value (threshold) to above-mentioned the 1st subdomain mapping code (sub-field mapping code) and the GTG value of above-mentioned the 2nd subdomain mapping code (sub-field mapping code) threshold value (threshold) storage part; Above-mentioned the 1st GTG value during less than above-mentioned the 2nd threshold value (threshold), is made as above-mentioned the 1st threshold value (threshold) the GTG value comparing section of the 2nd GTG value greater than above-mentioned the 1st threshold value (threshold); And in above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculating part of above-mentioned the 3rd GTG value.
The present invention also comprises: with above-mentioned the 3rd GTG value, carry out halftoning (half toning) portion that semitone (half tone) is handled with a certain at least method in shake (Dithering) or the error diffusion (error diffusion).
Plasma display system among the present invention the 2nd embodiment comprises: contrary gamma compensated (reverse gammacompensation) portion that the picture signal of outside input is carried out contrary gamma compensated (reverse gamma compensation); The 1st GTG value with the picture signal of above-mentioned contrary gamma compensated (reverse gamma compensation) portion input, be divided into the 2nd GTG value of mapping (mapping) to the non-low GTG subdomain (sub-field), with the GTG value cutting part of the 3rd GTG value of mapping (mapping) to the low GTG subdomain (sub-field); Filtering (filter) portion that to utilize low-pass filter (low pass filter) be the 4th GTG value with above-mentioned the 2nd GTG value filtering (filter); Calculate the poor of the 4th GTG value of above-mentioned filtering (filter) portion input and the 2nd GTG value, with the calculating part of above-mentioned difference and above-mentioned the 3rd GTG value addition; According to above-mentioned poor, the 4th GTG value semitone (half tone) is treated to the 1st halftoning (half toning) portion of the combination of a plurality of above-mentioned the 2nd GTG values; Above-mentioned the 2nd GTG value mapping (mapping) is shone upon (sub-fieldmapping) portion to the 1st subdomain on the 1st subdomain mapping code (sub-field mapping code); To be treated to the 2nd halftoning (half toning) portion of the combination of a plurality of above-mentioned the 3rd GTG values with above-mentioned the 3rd GTG value semitone (half tone) of above-mentioned poor addition; Above-mentioned the 3rd GTG value mapping (mapping) is shone upon (sub-field mapping) portion to the 2nd subdomain on the 2nd subdomain mapping code (sub-field mapping code); And comprehensive above-mentioned the 1st subdomain shines upon code (sub-fieldmapping code) and above-mentioned the 2nd subdomain shines upon code (sub-field mapping code), and the subdomain that generates the subdomain mapping code (sub-field mapping code) that is equivalent to a frame (frame) shines upon code (sub-field mapping code) Synthesis Department.
Above-mentioned GTG value cutting part, comprise: storage in advance will be shone upon (mapping) and will be made as the 1st threshold value (threshold) to the GTG value that above-mentioned the 1st subdomain shines upon code (sub-field mapping code), will shine upon (mapping) is made as threshold value (threshold) information of the 2nd threshold value (threshold) to above-mentioned the 1st subdomain mapping code (sub-field mapping code) and the GTG value of above-mentioned the 2nd subdomain mapping code (sub-field mapping code) threshold value (threshold) storage part; Above-mentioned the 1st GTG value during less than above-mentioned the 2nd threshold value (threshold), is made as above-mentioned the 1st threshold value (threshold) the GTG value comparing section of the 2nd GTG value greater than above-mentioned the 1st threshold value (threshold); And in above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculating part of above-mentioned the 3rd GTG value.
Also comprise:, carry out halftoning (halftoning) portion that semitone (half tone) is handled with a certain at least method in shake (Dithering) or the error diffusion (errordiffusion) with above-mentioned the 3rd GTG value.
The image processing method of the plasma display system among the present invention the 1st embodiment comprises: the stage of (a) picture signal of outside input being carried out contrary gamma compensated (reverse gamma compensation); (b) the 1st GTG value of the picture signal that above-mentioned (a) stage is imported, be divided into the 2nd GTG value of mapping (mapping) to the non-low GTG subdomain (sub-field), with the stage of the 3rd GTG value of mapping (mapping) to the low GTG subdomain (sub-field); (c) with the stage of above-mentioned the 2nd GTG value mapping (mapping) to the 1st subdomain mapping code (sub-field mapping code); (d) with the stage of above-mentioned the 3rd GTG value mapping (mapping) to the 2nd subdomain mapping code (sub-field mapping code); Reach (e) comprehensive above-mentioned the 1st subdomain mapping code (sub-field mapping code) and above-mentioned the 2nd subdomain mapping code (sub-field mapping code), generation is equivalent to the stage of the subdomain mapping code (sub-field mapping code) of a frame (frame).
Above-mentioned (b) stage, comprise: storage in advance will be shone upon (mapping) and will be made as the 1st threshold value (threshold) to the GTG value that above-mentioned the 1st subdomain shines upon code (sub-field mapping code), will shine upon (mapping) is made as threshold value (threshold) information of the 2nd threshold value (threshold) to above-mentioned the 1st subdomain mapping code (sub-field mapping code) and the GTG value of above-mentioned the 2nd subdomain mapping code (sub-field mapping code) threshold value (threshold) memory phase; Above-mentioned the 1st GTG value during less than above-mentioned the 2nd threshold value (threshold), is made as above-mentioned the 1st threshold value (threshold) the GTG value comparison phase of the 2nd GTG value greater than above-mentioned the 1st threshold value (threshold); And in above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculation stages of above-mentioned the 3rd GTG value.
Also comprise:, carry out the stage that semitone (half tone) is handled with a certain at least method in shake (Dithering) or the error diffusion (errordiffusion) with above-mentioned the 3rd GTG value.
The image processing method of the plasma display system among the present invention the 2nd embodiment comprises: the stage of (a) picture signal of outside input being carried out contrary gamma compensated (reverse gamma compensation); (b) the 1st GTG value of the picture signal that above-mentioned (a) stage is imported, be divided into the 2nd GTG value of mapping (mapping) to the non-low GTG subdomain (sub-field), with the stage of the 3rd GTG value of mapping (mapping) to the low GTG subdomain (sub-field); (c) utilizing low-pass filter (low pass filter) is the stage of the 4th GTG value with above-mentioned the 2nd GTG value filtering (filter); (d) calculate the poor of above-mentioned the 4th GTG value and the 2nd GTG value, with the stage of above-mentioned difference and above-mentioned the 3rd GTG value addition; (e), the 4th GTG value semitone (half tone) is treated to the stage of the combination of a plurality of above-mentioned the 2nd GTG values according to above-mentioned poor; (f) with the stage of above-mentioned the 2nd GTG value mapping (mapping) to the 1st subdomain mapping code (sub-field mapping code); (g) will be treated to the stage of a plurality of above-mentioned the 3rd GTG values with above-mentioned the 3rd GTG value semitone (half tone) of above-mentioned poor addition; (h) with the stage of above-mentioned the 3rd GTG value mapping (mapping) to the 2nd subdomain mapping code (sub-field mapping code); Reach (i) comprehensive above-mentioned the 1st subdomain mapping code (sub-field mapping code) and above-mentioned the 2nd subdomain mapping code (sub-field mapping code), generation is equivalent to the stage of the subdomain mapping code (sub-field mapping code) of a frame (frame).
Above-mentioned (b) stage, comprise: storage in advance will be shone upon (mapping) and will be made as the 1st threshold value (threshold) to the GTG value that above-mentioned the 1st subdomain shines upon code (sub-field mapping code), will shine upon (mapping) is made as threshold value (threshold) information of the 2nd threshold value (threshold) to above-mentioned the 1st subdomain mapping code (sub-field mapping code) and the GTG value of above-mentioned the 2nd subdomain mapping code (sub-field mapping code) threshold value (threshold) memory phase; Above-mentioned the 1st GTG value during less than above-mentioned the 2nd threshold value (threshold), is made as above-mentioned the 1st threshold value (threshold) the GTG value comparison phase of the 2nd GTG value greater than above-mentioned the 1st threshold value (threshold); And in above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculation stages of above-mentioned the 3rd GTG value.
Effect of the present invention is as follows:
Plasma display system among the present invention can reduce the semitone noise (halftone noise) of display image; In the image that shows, remove in the semitone noise (halftone noise), can reduce false contour noise (false Contour noise; Plasma display system of the present invention can improve GTG display capabilities and GTG linearity in the image that shows.
Four, description of drawings
Fig. 1 is the method for displaying image synoptic diagram of general plasma display system.
Fig. 2 is shake (Dithering) the method synoptic diagram of prior art ionic medium display device.
Fig. 3 is the synoptic diagram of the present invention's the 1st embodiment ionic medium display device.
Fig. 4 and Fig. 5 are the image processing method synoptic diagram of the present invention's the 1st embodiment ionic medium display device.
Fig. 6 is the brightness value curve map that shows for the GTG value among the present invention the 1st embodiment.
Fig. 7 is the synoptic diagram of the present invention's the 2nd embodiment ionic medium display device.
Fig. 8 is for the brightness value curve map of GTG value reality among the present invention the 2nd embodiment.
The symbol description of major part in the diagram
310,710: contrary gamma compensated (reverse gamma compensation) portion
320,720: gain (gain) control part 330,730: GTG value cutting part
331: threshold value (threshold) storage part 332: GTG value comparing section
The 340,770: the 1st subdomain mapping (sub-field mapping) portion
333: GTG value calculating part 350: halftoning (half toning) portion
The 360,790: the 2nd subdomain mapping (sub-field mapping) portion
370,800: subdomain mapping code (sub-field mapping code) is comprehensive
740: filtering (filter) portion 750: calculating part
760: the 1 halftoning (half toning) portions
780: the 2 halftoning (half toning) portions
Five, embodiment
Below, conjunction with figs. describes as follows to the specific embodiment among the present invention.
Fig. 3 is among the present invention the 1st embodiment, the synoptic diagram of plasma display system.
As shown in Figure 3, plasma display system among the present invention the 1st embodiment, comprise: contrary gamma compensated (reverse gamma compensation) portion 310, gain (gain) control part 320, GTG value cutting part 330, the 1st subdomain mapping (sub-field mapping) portion 340,350, the 2 subdomains mapping (sub-field mapping) portion 360 of halftoning (half toning) portion and subdomain mapping code (sub-fieldmapping code) Synthesis Department 370.
Contrary gamma compensated (reverse gamma eompensation) portion 310 carries out contrary gamma compensated (reverse gamma compensation) to the picture signal of outside input in every frame (frame).For the GTG value of picture signal, the GTG value of actual displayed is linearity curve in the plasma display system.On the contrary, the GTG value of the picture signal of outside input has gamma (gamma) characteristic, therefore, possesses contrary gamma compensated (reverse gamma compensation) portion 310 among the 1st embodiment of the present invention, external image signal is carried out contrary gamma compensated (reverse gamma compensation), thereby, make that the picture of actual displayed has linear GTG value in the plasma display system.
Gain (gain) control part 320 is for red (Red; Hereinafter referred to as R), green (Green; Hereinafter referred to as G) and blue (Blue; Hereinafter referred to as B) picture signal, and can multiply each other by gain (gain) value that user (User) or manufacturer (Set maker) adjust, press R, G and B adjust gain (gain) respectively.At this moment, by gain (gain) control part (320), user or manufacturer can set colour temperature arbitrarily.
To gain the 1st GTG value of picture signal of (gain) control part 320 input of GTG value cutting part 330, be divided into the 2nd GTG value of mapping (mapping) to the non-low GTG subdomain (sub-field), with the 3rd GTG value of mapping (mapping) to the low GTG subdomain (sub-field).Wherein, low GTG subdomain (sub-field) and non-low GTG subdomain (sub-field), in the whole subdomain (sub-field) with a frame (frame), main mapping (mapping) is called low GTG subdomain (sub-field) less than the subdomain (sub-field) of certain GTG value, and main mapping (mapping) is called non-low GTG subdomain (sub-field) greater than the subdomain (sub-field) of certain GTG value.As mentioned above, in order to distinguish the GTG value, GTG value cutting part 330 comprises: threshold value (threshold) storage part 331, GTG value comparing section 332 and GTG value calculating part 333.
Threshold value (threshold) storage part 331 is stored in advance and will be shone upon (mapping) and be made as the 1st threshold value (threshold) to the GTG value of above-mentioned the 1st subdomain mapping code (sub-field mapping code), will shine upon threshold value (threshold) information that GTG value that (mapping) shine upon code (sub-field mapping code) to above-mentioned the 1st subdomain mapping code (sub-field mapping code) and above-mentioned the 2nd subdomain is made as the 2nd threshold value (threshold).GTG value comparing section 332 greater than the 1st threshold value (threshold), during less than the 2nd threshold value (threshold), is made as the 2nd GTG value with the 1st threshold value (threshold) in the 1st GTG value.GTG value calculating part 333 cuts the 2nd GTG value in the 1st GTG value, thereby sets the 3rd GTG value.
As mentioned above, utilize the GTG value cutting part 330 among the present invention the 1st embodiment, distinguish low GTG subdomain (sub-field) and shine upon (mapping), thereby can use actual gray more with non-low GTG subdomain (sub-field).More detailed content for GTG value cutting part 330 is elaborated by Fig. 4 and Fig. 5 later on.
(mapping) shone upon to the 1st subdomain mapping code (sub-field mapping code) with the 2nd GTG value in the 1st subdomain mapping (sub-field mapping) portion 340.Wherein, the 2nd GTG value is the actual gray value, corresponding to non-low GTG value.
The 3rd picture signal of halftoning (half toning) portion 350 pairs of GTG values cutting part 330 inputs is carried out semitone (half tone) and is handled.Carry out the picture signal of contrary gamma compensated (reverse gamma compensation), in its signal processing, the GTG display capabilities will descend.For this is compensated, among the 1st embodiment of the present invention, possess halftoning (half toning) portion 350, handle carrying out semitone (half tone) through the picture signal of contrary gamma compensated (reverse gamma compensation).Wherein, carrying out semitone (half tone) with at least a method in shake (Dithering) or the error diffusion (error diffusion) handles.
(mapping) shone upon to the 2nd subdomain mapping code (sub-field mapping code) with the 3rd GTG value in the 2nd subdomain mapping (sub-field mapping) portion 360.Wherein, the 3rd GTG value is the actual gray value, corresponding to low GTG value.Therefore, above-mentioned halftoning (half toning) portion 350 cuts the 2nd GTG value with the 1st GTG value and the low GTG value that generates, and with actual gray, promptly a plurality of the 3rd GTG values make up, thereby show above-mentioned low GTG value.
Subdomain mapping code (sub-field mapping code) Synthesis Department 370 comprehensive the 1st subdomain mapping codes (sub-field mapping code) and the 2nd subdomain mapping code (sub-field mappingcode).Generation is corresponding to the subdomain mapping code (sub-field mapping code) of a frame (frame).Comprehensive actual gray, be a plurality of the 1st subdomain mapping codes (sub-fieldmapping code) of a plurality of the 2nd GTG values, with actual gray, be a plurality of the 2nd subdomain mapping codes (sub-field mapping code) of a plurality of the 3rd GTG values, thereby can generate diversified subdomain mapping code (sub-fieldmapping code).Therefore, can reduce the semitone noise (halftonenoise) of plasma display system.Then, subdomain mapping code (sub-field mapping code) is used for, and drives the information that the digital drive portion (not shown) of position pulse is provided to keeper electrode (not shown).
Fig. 4 and Fig. 5 are among the present invention the 1st embodiment, the image processing method synoptic diagram of plasma display system.Fig. 4 is among the 1st embodiment of the present invention, the 1st subdomain mapping code (sub-fieldmapping code) and the 2nd subdomain mapping code (sub-field mapping code) synoptic diagram, Fig. 5 is among the 1st embodiment of the present invention, threshold value (threshold) synoptic diagram of storing in threshold value (threshold) storage part.
In conjunction with Fig. 4 and Fig. 5, in the image processing method of the plasma display system among the present invention the 1st embodiment, be divided into the 1st subdomain mapping code (sub-field mapping code) and the 2nd subdomain mapping code (sub-field mapping code) two groups.The 1st subdomain mapping code (sub-field mappingcode) is the fixing mapping code (mapping code) that does not use semitone (half tone), has the bigger GTG value difference between mapping code (mapping code).The 2nd subdomain mapping code (sub-fieldmapping code) is to show GTG between the 1st subdomain mapping code (sub-field mapping code), shows because the 1st subdomain mapping code (sub-field mapping code) does not use semitone (halftone) and can't be with the low GTG value of the 1st subdomain mapping code (sub-field mapping code) demonstration.
At first, the threshold value (threshold) of the 1st GTG value with storage in advance compared, which mapping code (mapping code) decision uses.For example, the 1st GTG value is pre-when showing corresponding to 20,000 GTG, with reference among the figure 5, Cun Chu threshold value (threshold) in advance is because 17,477＜20,000＜21,536, therefore, the 1st subdomain mapping code (sub-field mapping code) selects 5.The 1st threshold value (threshold) is corresponding to the 2nd GTG value that shows the 1st subdomain mapping code (sub-fieldmapping code), the maximum gray value that the 2nd threshold value (threshold) can show corresponding to the combination of the 1st subdomain mapping code (sub-field mapping code) and the 2nd subdomain mapping code (sub-field mappingcode), that is, corresponding to maximum the 2nd GTG value and the 3rd GTG value with.
Then, 5 are decided to be the 1st subdomain mapping code (sub-field mapping code), therefore, corresponding to 17,477 the 2nd GTG value is shown as the 1st subdomain mapping code (sub-field mappingcode), the 3rd GTG value corresponding to 2,523 is shown as the 2nd subdomain mapping code (sub-fieldmapping code).
Therefore, the quantity of maximum actual gray will be the value that the 1st subdomain mapping code (sub-field mappingcode) quantity and the 2nd subdomain mapping code (sub-field mapping code) quantity multiply each other.Can reduce semitone noise (halftone noise) fully.
Fig. 6 is among the present invention the 1st embodiment, for the brightness value curve map of GTG value demonstration.
With reference to figure 6, (a) be the situation of shining upon the picture signal of (mapping) with the 1st subdomain mapping code (sub-field mapping code) output, the brightness value that shows in the expression plasma display system, (b) be the situation of shining upon the picture signal of (mapping) with the 2nd subdomain mapping code (sub-field mapping code) output, the brightness value that shows in the expression plasma display system.(c) be comprehensive the 1st subdomain mapping code (sub-field mapping code) and the 2nd subdomain mapping code (sub-field mappingcode), show the brightness value of plasma display system according to whole subdomain mapping code (sub-field mapping code).As mentioned above, comprehensive the 1st subdomain mapping code (sub-field mapping code) and the 2nd subdomain mapping code (sub-field mapping code), thus can extract actual gray with diversified value.
On the one hand, in conjunction with in order to reduce semitone noise (halftone noise), and the false contour noise (false Contour noise) that takes place when using actual gray in a large number describes as follows to the 2nd embodiment of the present invention.
Fig. 7 is among the present invention the 2nd embodiment, the synoptic diagram of plasma display system.
As shown in Figure 7, plasma display system among the present invention the 2nd embodiment, comprise: contrary gamma compensated (reverse gamma compensation) portion 710, gain (gain) control part 720, GTG value cutting part 730, filtering (filter) portion 740, calculating part 750, the 1st halftoning (half toning) portion 760, the 1st subdomain mapping (sub-field mapping) portion 770,780, the 2 subdomains mapping (sub-field mapping) portion 790 of the 2nd halftoning (half toning) portion and subdomain mapping code (sub-fieldmapping code) Synthesis Department 800.
Wherein, in the operating characteristic of each the function portion of plasma display system among the present invention the 2nd embodiment, and by Fig. 3 to Fig. 6 explanation, the operating characteristic repeated content of each function portion of the plasma display system in the one embodiment of the invention is omitted to mention at this.
To gain the 1st GTG value of picture signal of (gain) control part 720 input of GTG value cutting part 730, be divided into the 2nd GTG value of mapping (mapping) to the non-low GTG subdomain (sub-field), with the 3rd GTG value of mapping (mapping) to the low GTG subdomain (sub-field).
It is the 4th GTG value with above-mentioned the 2nd GTG value filtering (filter) that filtering (filter) portion 740 utilizes low-pass filter (low pass filter).The field of false contouring (false Contour) takes place, when in moving image, changing the GTG value, along with the variation of the maximum subdomain (sub-field) of be unlocked (turn-on), close between a fairly large number of GTG value of subdomain (sub-field) of (turn-off) more false contour noise (false Contour noise) takes place.For the pixel with above-mentioned GTG value (pixel) field, utilize low-pass filter (low pass filter) to adjust the GTG value.Along with the GTG value that is assigned in the pixel (pixel) is adjusted, the GTG value will be distributed in the adjacent pixels (pixel).As mentioned above, with low-pass filter (low pass filter) mapping (mapping) is carried out filtering (filter) to a plurality of the 2nd GTG values of the 1st subdomain mapping code (sub-fieldmapping code), thereby can remove false contour noise (false Contour noise).
The 4th GTG value of calculating part 750 calculation of filtered (filter) portion 740 input is poor with the 2nd GTG value, with its difference and above-mentioned the 3rd GTG value addition.Above-mentioned difference is used to carry out the information of the 1st semitone (half tone), is used for the information of the 2nd semitone (half tone) to the 3rd GTG value that adds with above-mentioned difference.The 1st halftoning (half toning) portion 760 is poor according to calculating part 750 calculating, with the combination of a plurality of the 2nd GTG values, the 4th GTG value is carried out semitone (half tone) handle.That is, according to and the 4th GTG value adjusted by low-pass filtering (low pass filtering) between poor, make up actual gray, promptly a plurality of the 2nd GTG values show the 4th GTG value.
(mapping) shone upon to the 1st subdomain mapping code (sub-field mapping code) with the 2nd GTG value in the 1st subdomain mapping (sub-field mapping) portion 770.
With the 3rd GTG value of difference addition, carry out semitone (half tone) with the combination of a plurality of the 3rd GTG values and handle in 780 pairs of calculating parts 750 of the 2nd halftoning (half toning) portion.That is, according to and the 4th GTG value adjusted by low-pass filtering (low pass filtering) between poor, the combination actual gray, promptly a plurality of the 3rd GTG values show and the 3rd GTG value of difference addition.Owing to show the 4th GTG value by the 1st halftoning (half toning) portion 760, therefore, the 2nd halftoning (half toning) portion 780 shows that the 1st GTG value cuts the GTG value of the 4th GTG value, promptly with the GTG value of difference addition.(mapping) shone upon to the 2nd subdomain mapping code (sub-field mapping code) with the 3rd GTG value in the 2nd subdomain mapping (sub-field mapping) portion (790).
Subdomain mapping code (sub-field mapping code) Synthesis Department 800 comprehensive the 1st subdomain mapping codes (sub-field mapping code) and the 2nd subdomain mapping code (sub-field mappingcode) generate the subdomain mapping code (sub-field mapping code) corresponding to a frame (frame).Comprehensive actual gray, be a plurality of the 1st subdomain mapping codes (sub-fieldmapping code) of a plurality of the 2nd GTG values, with actual gray, be a plurality of the 2nd subdomain mapping codes (sub-field mapping code) of a plurality of the 3rd GTG values, thereby can generate diversified subdomain mapping code (sub-fieldmapping code).Again, low-pass filter (low pass filter) can reduce false contour noise (false Contour noise).Then, subdomain mapping code (sub-field mapping code) is used for, and drives the information that the digital drive portion (not shown) of position pulse is provided to keeper electrode (not shown).Fig. 8 is among the present invention the 2nd embodiment, for the brightness value curve map of GTG value reality.
With reference to figure 8, (a) be the situation of shining upon the picture signal of (mapping) with the 1st subdomain mapping code (sub-field mapping code) output, the brightness value that shows in the expression plasma display system, (b) be the situation of shining upon the picture signal of (mapping) with the 2nd subdomain mapping code (sub-field mapping code) output, the brightness value that shows in the expression plasma display system.(c) be comprehensive the 1st subdomain mapping code (sub-field mapping code) and the 2nd subdomain mapping code (sub-field mappingcode), show the brightness value of plasma display system according to whole subdomain mapping code (sub-field mapping code).(a) in, brightness value rises with certain degree of tilt, (b) in, brightness value changes lentamente.As mentioned above, when removing semitone noise (halftone noise), can remove false contour noise (false Contour noise).
The image processing method of the plasma display system among the present invention the 2nd embodiment comprises: the stage of (a) picture signal of outside input being carried out contrary gamma compensated (reverse gamma compensation); (b) the 1st GTG value of the picture signal that above-mentioned (a) stage is imported, be divided into the 2nd GTG value of mapping (mapping) to the non-low GTG subdomain (sub-field), with the stage of the 3rd GTG value of mapping (mapping) to the low GTG subdomain (sub-field); (c) utilizing low-pass filter (low pass filter) is the stage of the 4th GTG value with above-mentioned the 2nd GTG value filtering (filter); (d) calculate the poor of above-mentioned the 4th GTG value and the 2nd GTG value, with the stage of above-mentioned difference and above-mentioned the 3rd GTG value addition; (e), the 4th GTG value semitone (half tone) is treated to the stage of the combination of a plurality of above-mentioned the 2nd GTG values according to above-mentioned poor; (f) with the stage of above-mentioned the 2nd GTG value mapping (mapping) to the 1st subdomain mapping code (sub-fieldmapping code); (g) will be treated to the stage of a plurality of above-mentioned the 3rd GTG values with above-mentioned the 3rd GTG value semitone (halftone) of above-mentioned poor addition; (h) with the stage of above-mentioned the 3rd GTG value mapping (mapping) to the 2nd subdomain mapping code (sub-field mapping code); Reach (i) comprehensive above-mentioned the 1st subdomain mapping code (sub-field mapping code) and above-mentioned the 2nd subdomain mapping code (sub-field mapping code), generation is equivalent to the stage of the subdomain mapping code (sub-field mapping code) of a frame (frame).Wherein, detailed content for the image processing method of the plasma display system among the present invention the 2nd embodiment, by among Fig. 7 and Fig. 8, the operating characteristic of the plasma display system among the present invention the 2nd embodiment is illustrated fully, omits to mention at this.
As mentioned above, the plasma display system among the present invention can reduce the semitone noise (halftone noise) of display image.
Again, plasma display system of the present invention is removed in the semitone noise (halftonenoise) in the image that shows, can reduce false contour noise (false Contour noise).
Again, plasma display system of the present invention can improve GTG display capabilities and GTG linearity in the image that shows.
As mentioned above; though the present invention about plasma display system and image processing method thereof with preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can carry out various changes and modification, so protection scope of the present invention is as the criterion when looking the claim restricted portion that is proposed.
Claims (10)
1. plasma display system is characterized in that: it comprises the contrary gamma compensated portion that the picture signal of outside input is carried out contrary gamma compensated; The 1st GTG value with the picture signal of above-mentioned contrary gamma compensated portion input is divided into the 2nd GTG value that is mapped on the non-low GTG subdomain, with the GTG value cutting part that is mapped to the 3rd GTG value on the low GTG subdomain; Above-mentioned the 2nd GTG value is mapped to the 1st subdomain mapping portion on the 1st subdomain mapping code; Above-mentioned the 3rd GTG value is mapped to the 2nd subdomain mapping portion on the 2nd subdomain mapping code; And comprehensive above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain mapping code, generation is equivalent to the subdomain mapping code Synthesis Department of the subdomain mapping code of a frame.
2. plasma display system according to claim 1, it is characterized in that: above-mentioned GTG value cutting part, comprise in advance the GTG value that storage will be mapped to above-mentioned the 1st subdomain mapping code and be made as the 1st threshold value, will be mapped to the threshold value storage part that GTG value that above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain shine upon code is made as the threshold information of the 2nd threshold value; Above-mentioned the 1st GTG value is greater than above-mentioned the 1st threshold value, during less than above-mentioned the 2nd threshold value, above-mentioned the 1st threshold value is made as the GTG value comparing section of the 2nd GTG value; And in above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculating part of above-mentioned the 3rd GTG value.
3. plasma display system according to claim 1 is characterized in that: it also comprises above-mentioned the 3rd GTG value, carries out the halftoning portion that semitone is handled with a certain at least method in shake or the error diffusion.
4. plasma display system is characterized in that: it comprises the contrary gamma compensated portion that the picture signal of outside input is carried out contrary gamma compensated; The 1st GTG value with the picture signal of above-mentioned contrary gamma compensated portion input is divided into the 2nd GTG value that is mapped on the non-low GTG subdomain, with the GTG value cutting part that is mapped to the 3rd GTG value on the low GTG subdomain; The filtering portion that to utilize low-pass filter be the 4th GTG value with above-mentioned the 2nd GTG value filtering; Calculate the poor of the 4th GTG value of above-mentioned filtering portion input and the 2nd GTG value, with the calculating part of above-mentioned difference and above-mentioned the 3rd GTG value addition; According to above-mentioned poor, the 4th GTG value semitone is treated to the 1st halftoning portion of the combination of a plurality of above-mentioned the 2nd GTG values; Above-mentioned the 2nd GTG value is mapped to the 1st subdomain mapping portion on the 1st subdomain mapping code; To be treated to the 2nd halftoning portion of the combination of a plurality of above-mentioned the 3rd GTG values with above-mentioned the 3rd GTG value semitone of above-mentioned poor addition; Above-mentioned the 3rd GTG value is mapped to the 2nd subdomain mapping portion on the 2nd subdomain mapping code; And comprehensive above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain mapping code, generation is equivalent to the subdomain mapping code Synthesis Department of the subdomain mapping code of a frame.
5. plasma display system according to claim 4, it is characterized in that: above-mentioned GTG value cutting part, comprise in advance the GTG value that storage will be mapped to above-mentioned the 1st subdomain mapping code and be made as the 1st threshold value, will be mapped to the threshold value storage part that GTG value that above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain shine upon code is made as the threshold information of the 2nd threshold value; Above-mentioned the 1st GTG value is greater than above-mentioned the 1st threshold value, during less than above-mentioned the 2nd threshold value, above-mentioned the 1st threshold value is made as the GTG value comparing section of the 2nd GTG value; And in above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculating part of above-mentioned the 3rd GTG value.
6. the image processing method of a plasma display system is characterized in that it comprised with the next stage:
(a) picture signal that the outside is imported is carried out the stage of contrary gamma compensated;
(b) the 1st GTG value of the picture signal that above-mentioned (a) stage is imported is divided into the 2nd GTG value that is mapped on the non-low GTG subdomain, with the stage that is mapped to the 3rd GTG value on the low GTG subdomain;
(c) above-mentioned the 2nd GTG value is mapped to the stage that the 1st subdomain shines upon code;
(d) above-mentioned the 3rd GTG value is mapped to the stage that the 2nd subdomain shines upon code;
(e) comprehensive above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain mapping code, generation is equivalent to the stage of the subdomain mapping code of a frame.
7. the image processing method of plasma display system according to claim 6 is characterized in that above-mentioned (b) stage, comprises:
The GTG value that storage in advance will be mapped to above-mentioned the 1st subdomain mapping code is made as the 1st threshold value, the GTG value that is mapped to above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain mapping code is made as the threshold value memory phase of the threshold information of the 2nd threshold value;
Above-mentioned the 1st GTG value is greater than above-mentioned the 1st threshold value, during less than above-mentioned the 2nd threshold value, above-mentioned the 1st threshold value is made as the GTG value comparison phase of the 2nd GTG value;
In above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculation stages of above-mentioned the 3rd GTG value.
8. the image processing method of plasma display system according to claim 6 is characterized in that it also comprises: with above-mentioned the 3rd GTG value, carry out the stage that semitone is handled with a certain at least method in shake or the error diffusion.
9. the image processing method of a plasma display system is characterized in that it comprised with the next stage:
(a) picture signal that the outside is imported is carried out the stage of contrary gamma compensated;
(b) the 1st GTG value of the picture signal that above-mentioned (a) stage is imported is divided into the 2nd GTG value that is mapped on the non-low GTG subdomain, with the stage that is mapped to the 3rd GTG value on the low GTG subdomain;
(c) utilizing low-pass filter is the stage of the 4th GTG value with above-mentioned the 2nd GTG value filtering;
(d) calculate the poor of above-mentioned the 4th GTG value and the 2nd GTG value, with the stage of above-mentioned difference and above-mentioned the 3rd GTG value addition;
(e), the 4th GTG value semitone is treated to the stage of the combination of a plurality of above-mentioned the 2nd GTG values according to above-mentioned poor;
(f) above-mentioned the 2nd GTG value is mapped to stage on the 1st subdomain mapping code;
(g) will be treated to the stage of a plurality of above-mentioned the 3rd GTG values with above-mentioned the 3rd GTG value semitone of above-mentioned poor addition;
(h) above-mentioned the 3rd GTG value is mapped to stage on the 2nd subdomain mapping code;
(i) comprehensive above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain mapping code, generation is equivalent to the stage of the subdomain mapping code of a frame.
10. the image processing method of plasma display system according to claim 9 is characterized in that above-mentioned (b) stage, comprises:
The GTG value that storage in advance will be mapped to above-mentioned the 1st subdomain mapping code is made as the 1st threshold value, the GTG value that is mapped to above-mentioned the 1st subdomain mapping code and above-mentioned the 2nd subdomain mapping code is made as the threshold value memory phase of the threshold information of the 2nd threshold value;
Above-mentioned the 1st GTG value is greater than above-mentioned the 1st threshold value, during less than above-mentioned the 2nd threshold value, above-mentioned the 1st threshold value is made as the GTG value comparison phase of the 2nd GTG value;
In above-mentioned the 1st GTG value, cut above-mentioned the 2nd GTG value, thereby set the GTG value calculation stages of above-mentioned the 3rd GTG value.
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| KR1020060001893A KR100765508B1 (en) | 2006-01-06 | 2006-01-06 | Plasma Display Apparatus and Image Processing Method thereof |
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| KR100359015B1 (en) * | 2000-03-14 | 2002-10-31 | 엘지전자주식회사 | Method Of Driving Plasma Display Panel In High Speed |
| JP2002351390A (en) * | 2001-05-24 | 2002-12-06 | Lg Electronics Inc | Display device and grey level display method |
| JP2002351356A (en) * | 2001-05-24 | 2002-12-06 | Matsushita Electric Ind Co Ltd | Display device, liquid crystal display device and semiconductor device for display device |
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