CN1920915A - Plasma display device and image processing method thereof - Google Patents

Plasma display device and image processing method thereof Download PDF

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CN1920915A
CN1920915A CNA2006101596116A CN200610159611A CN1920915A CN 1920915 A CN1920915 A CN 1920915A CN A2006101596116 A CNA2006101596116 A CN A2006101596116A CN 200610159611 A CN200610159611 A CN 200610159611A CN 1920915 A CN1920915 A CN 1920915A
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mpd
zone
image frame
vision signal
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CN100416632C (en
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白承杰
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LG Electronics Nanjing Plasma Co Ltd
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LG Electronics Nanjing Plasma Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Power Engineering (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)

Abstract

Disclosed is a plasma display device and image processing method thereof which can effectively detect MPD, including a moving area detector, comparing the gray scale value of the video signal in the pre-image plane frame and that of the current image plane frame, and then detecting the moving area of the detection image; a MPD detector operating the MPD value between the adjacent pixel and then detecting the MPD area using the subdomain mapping code of the video signal in the pre-image plane frame; a false contour compensatory zone estimator judging the false contour compensatory zone of the image in the image plane of the current image plane frame using the moving area detection information input by the moving area detector and the MPD detection information input by the MPD detector; a false contour compensator wherein the video signals of the false contour compensatory zone are mapped by the false contour compensatory subdomain.

Description

Plasma display system and image processing method thereof
One, technical field
The invention relates to plasma display system, a kind of plasma display system and image processing method thereof that can more effectively detect MPD (Moving Picture Distortion) of saying so in more detail.
Two, background technology
In general, plasma display system (Plasma Display Apparatus) comprises that the next door that is formed between front panel and the rear panel forms the Plasmia indicating panel of a unit cell.In each unit, be filled with neon (Ne), helium (He) or charging and discharging gas as the mixed gas (Ne+He) of neon and helium and the inert gas that contains small amount of xenon.When relying on HF voltage to discharge, make inert gas send vacuum ultraviolet (Vacuum Ultraviolet rays), thereby make the light-emitting phosphor that is formed between the next door come display frame.Such plasma display system structure is not only thin but also light, is the display device of future generation that gets most of the attention.
Fig. 1 is the synoptic diagram that shows the method for the image that has plasma display system now.
As shown in Figure 1, plasma display system is divided into the mutually different a plurality of subdomains of discharge time with an image frame phase, makes Plasmia indicating panel luminous in relative sub-regions phase of gray-scale value of the vision signal of input, thus display image.
Each subdomain is divided into initial period, the address period of selecting discharge cell that produces discharge equably and relies on discharge time to realize keeping the phase of gray scale.For example, in the time of be with 256 gray scale display images, the image frame phase (16.67ms) that just will be equivalent to 1/60 second is divided into 8 subdomains.
Simultaneously, 8 subdomains are divided into initial period, address period again separately and keep the phase.Here, keep the phase in each subdomain with 2 nThe ratio of (n=0,1,2,3,4,5,6,7) increases.Like this, the phase of keeping changes in each subdomain, therefore can realize the gray scale (Gray level) of image.
Like this, if the many subdomains of usage quantity just can be realized the gray scale of greater number.But, be the time that an image frame distributes limitation to be arranged, therefore the subdomain quantity that can use is in fact below 12.All the gray scale number that uses 12 subdomains to access is 2 12Individual, though quantity is quite a lot of, can not all use.Because so the subdomain type of drive of plasma display system as shown in Figure 2, produces dynamic image false contouring (dynamic false contour noise) in animation.
Fig. 2 is the synoptic diagram of the animation false contouring in the existing plasma display system of explanation.
As shown in Figure 2, in the image of being realized by 8 subdomains, when the object of motion had gray-scale value 128 and gray-scale value 127, in fact the grey value difference between both sides' pixel was 1.But along with the moving direction of the object that moves, the gray-scale value that people's sight line track will be seen is 255 or 0.Promptly, in a pixel, when the gray-scale value of the vision signal of image frame (n-1) before is 127, the gray-scale value of the vision signal of current image frame (n) is 128 o'clock, the subdomains of 127 of image frame values before unlatching shows are opened the time durations of 128 subdomains that are worth that show current image frame then, owing to close the subdomain that is equivalent to an image frame, so 0 value occurs, false contouring take place.In addition, in a pixel, when the gray-scale value of the vision signal of image frame (n-1) before is 128, the gray-scale value of the vision signal of current image frame (n) is 127 o'clock, opens the subdomains of 128 values of image frame before showing, then, directly open the subdomain of 127 values that show current image frame, not free blank is so open the subdomain that is equivalent to an image frame, so 255 values occur, false contouring take place.
In such dynamic image, in order to suppress false contouring, in order to detect the regional of dynamic image false contouring appearance and to compensate false contouring, prior art has been used multiple algorithm.In such dynamic image, in order to detect a large amount of zones that occur of false contouring, as shown in Figure 3, prior art has been used MPD (Moving Picture Distortion) method.
Fig. 3 is the synoptic diagram of the existing MPD detection method of explanation.
As shown in Figure 3, at first, existing MPD detection method utilizes the subdomain mapping code to image frame (n-1) and current image frame (n) before the same pixel to calculate the MPD value.Here, the MPD value is by each subdomain the subdomain mapping code of image frame (n-1) and current image frame (n) before to be carried out XOR (XOR) computing, and the result that will draw multiply by the resulting value of weighted value of each subdomain then.
For example, in Fig. 3, when the XOR result by image frame (n-1) before each subdomain and current image frame (n) is " 0,0,0,0,1,1,0,0,1,0 ", when the weighted value of each subdomain was " 1,2,4,8,16,32,64,64,64,64 ", the MPD value was 102 according to following mathematical expression 1.
Mathematical expression 1
MPD value: 1*16+1*32+1*64=102
Afterwards, the MPD value that generates like this detects big zone and is the MPD zone, then carries out the false contouring compensation.
Here, there are the following problems for prior art: in order to detect MPD, the subdomain of the subdomain of image frame mapping code and current image frame shines upon code before the utilization, and therefore, the subdomain of the subdomain mapping code of image frame shines upon code memory before needing to store.This subdomain mapping code memory causes the production unit price of plasma display system to rise, and, owing to the subdomain mapping code of image frame before the comparison operation and the subdomain mapping code of current image frame, so algorithm constitutes complexity.
Three, summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind ofly by improving plasma display system and image processing method thereof, can detect the plasma display system of MPD effectively.
And another object of the present invention is: improve plasma display system and image processing method thereof, provide and can reduce the plasma display system of producing unit price.
And another object of the present invention is: improve plasma display system and image processing method thereof, be provided at the plasma display system that can suppress the dynamic image false contouring in the image of demonstration.
To achieve these goals, plasma display system of the present invention comprises: the gray-scale value of the vision signal of the vision signal of image frame and current image frame relatively, thereby the moving area detecting device of the moving area of detected image; Utilize the subdomain mapping code of the above-mentioned vision signal of image frame before, MPD (the Moving Picture Distortion) value between the pixel that computing is close to mutually, thereby the MPD detecting device in detection MPD zone; Utilize the moving area detection information of above-mentioned moving area detecting device input and the MPD of above-mentioned MPD detecting device input to detect information, in the picture of above-mentioned current image frame, judge the false contouring compensatory zone determining device of the false contouring compensatory zone of image; False contouring compensation subdomain shines upon the false contouring compensator of the vision signal of above-mentioned false contouring compensatory zone.
Plasma display system of the present invention also comprises: store the image frame storer of the vision signal of image frame before from the outside input in advance.
Transmitted the information of the zone more than above-mentioned the 1st threshold values as moving area to above-mentioned false contouring compensatory zone determining device then in the zone of grey value difference more than the 1st threshold values of regulation of the vision signal of the vision signal of image frame and current image frame before above-mentioned moving area detecting device detection was above-mentioned.
Above-mentioned MPD detecting device comprises: the subdomain mapper of the vision signal of image frame before the subdomain mapping is above-mentioned; Utilize the subdomain mapping code computing MPD value of above-mentioned neighborhood pixels, judge the whether MPD determining device more than the 2nd threshold values of stipulating of above-mentioned MPD value; The pixel of judging with above-mentioned MPD determining device is the zone that regulation is set at the center, and transmits the MPD zone setting apparatus of above-mentioned zone as the information in MPD zone to above-mentioned false contouring compensatory zone determining device.
It is to carry out between contiguous up and down pixel that above-mentioned MPD detects.
Above-mentioned false contouring compensatory zone determining device will be above-mentioned moving area and be that the region decision in above-mentioned MPD zone is the false contouring compensatory zone.
Above-mentioned false contouring compensator makes the subdomain mapping code of above-mentioned false contouring compensation subdomain mapping code and non-false contouring compensatory zone different.
Plasma display system of the present invention also comprises: to the reverse gamma corrector of the above-mentioned vision signal of the reverse gray correction of each image frame; Partly transfer above-mentioned reverse gray correction vision signal partly transfer device.
Detection of the present invention comprises with the next stage from the image processing method of the plasma display system of the MPD (Moving Picture Distortion) of the vision signal of outside input: the gray-scale value of the vision signal of the vision signal of image frame and current image frame relatively, the moving area detection-phase of the moving area of detected image; Utilize the subdomain mapping code of the above-mentioned vision signal of image frame before, MPD (the Moving Picture Distortion) value between the pixel that computing is close to mutually, the MPD detection-phase in detection MPD zone; Utilize above-mentioned moving area to detect information and above-mentioned MPD area information, judge that in the picture of above-mentioned current image frame the false contouring compensatory zone of the false contouring compensatory zone of image is judged the stage; False contouring compensation subdomain shines upon the false contouring compensated stage of the vision signal of above-mentioned false contouring compensatory zone.
The image processing method of plasma display system of the present invention also comprises: store the image frame memory phase of the vision signal of image frame before from the outside input in advance.
Above-mentioned moving area detection-phase comprises: detect above-mentioned before stage in the zone of difference more than the 1st threshold values of regulation of gray-scale value of vision signal of the vision signal of image frame and current image frame; Generate the stage of the zone that above-mentioned the 1st threshold values is above as the information of moving area.
Above-mentioned MPD detection-phase comprises: the subdomain of the vision signal of the image frame mapping stage before the subdomain mapping is above-mentioned; Utilize the subdomain mapping code computing MPD value of above-mentioned neighborhood pixels, judge above-mentioned MPD value MPD judgement stage more than the 2nd threshold values of stipulating whether; The pixel of judging with above-mentioned MPD determining device is the zone that regulation is set at the center, generates the stage of above-mentioned zone as the information in MPD zone.
It is to carry out between contiguous up and down pixel that above-mentioned MPD detects.
To be above-mentioned moving area and be that the region decision in above-mentioned MPD zone is the false contouring compensatory zone.
Make the subdomain mapping code of above-mentioned false contouring compensation subdomain mapping code and non-false contouring compensatory zone different.
The image processing method of plasma display system of the present invention also comprises: to the reverse gray correction stage of the above-mentioned vision signal of the reverse gray correction of each image frame; Partly transfer the half accent stage of the vision signal of above-mentioned reverse gray correction.
The present invention has following effect: by improving plasma display system and image processing method thereof, utilize from the vision signal of outside input and can detect MPD effectively.
And, by improving plasma display system and image processing method thereof, can reduce the production unit price.
And, by improving plasma display system and image processing method thereof, in the image that shows, can suppress the animation false contouring.
Four, description of drawings
Fig. 1 is the synoptic diagram that shows the method for the image that has plasma display system now.
Fig. 2 is the synoptic diagram of the dynamic image false contouring in the existing plasma display system of explanation.
Fig. 3 is the synoptic diagram of the existing MPD detection method of explanation.
Fig. 4 is the synoptic diagram of explanation according to the plasma display system of one embodiment of the invention.
Fig. 5 is the synoptic diagram of explanation according to the operating characteristic of the MPD detecting device of one embodiment of the invention.
Fig. 6 is the synoptic diagram of explanation according to the false contouring region decision method of one embodiment of the invention.
The symbol description of major part in the accompanying drawing
400: image frame storer 410: the moving area detecting device
420: reverse gamma corrector 430: partly transfer device
440:MPD detecting device 450: false contouring compensatory zone determining device
460: false contouring compensator 500:MPD detecting device
510: subdomain mapper 520:MPD determining device
530:MPD zone setting apparatus
Five, embodiment
Below, with reference to accompanying drawing the foundation specific embodiments of the invention are described.
Fig. 4 is the synoptic diagram of explanation according to the plasma display system of one embodiment of the present of invention.
As shown in Figure 4, the plasma display system according to one embodiment of the present of invention comprises: image frame storer 400, moving area detecting device 410, oppositely gamma corrector 420, partly transfer device 430, MPD detecting device 440, false contouring compensatory zone determining device 450, false contouring compensator 460.
Image frame storer 400 is with the image frame unit storage vision signal from the outside input, this be for moving area detecting device 410 relatively before image frame (n-1) and current image frame (n) thus vision signal detection moving area.That is the vision signal of the current image frame (n) of the vision signal of image frame (n-1) and real-time input compares before, image frame storer 400 being stored in advance.Not only moving area detecting device 410 can use the vision signal with the storage of image frame unit, and other funtion parts also can be used.
Moving area detecting device 410 relatively 410 inputs of image frame storer before image frame (n-1) vision signal and from the gray-scale value of the vision signal of the current image frame (n) of outside input, thereby detect moving area in the image that shows.In more detail, moving area detecting device 410 detects the zone of above-mentioned grey value difference more than predefined the 1st threshold values behind the grey value difference of the vision signal of the vision signal of image frame before the computing (n-1) and current image frame (n).At this moment, the computing of grey value difference is performed at same pixel or the same area.That is, for same pixel or the same area, when the gray value differences different time that has more than the 1st threshold values, in the picture of actual displayed, with respect to image frame before, current image frame objects displayed is moved, and hence one can see that has grey value difference.Like this, it is moving area that the zone more than the 1st threshold values is detected, and transmits the information of moving areas then to false contouring compensatory zone determining device 450.
Oppositely gamma corrector 420 is to the vision signal of the reverse gray correction of each image frame from the outside input.The brightness value of the actual displayed that is characterized as the vision signal gray-scale value that plasma display system has forms linearity curve.On the contrary, vision signal from the outside input, the brightness value of gray-scale value has gamma characteristic, therefore one embodiment of the present of invention have reverse gamma corrector 420, reverse gray correction outer video signal, so that for gray-scale value, the picture of plasma display system actual displayed has linear brightness value.
Partly transfer device 430 half to transfer the vision signal of reverse gray correction.Oppositely the vision signal of gray correction has reduced the gray scale expressive force in its signal processing.For it is compensated, one embodiment of the present of invention have half and transfer device 430, thereby in the gray scale expressive force that raising has reduced, guarantee the gray scale linearity.Half accent method like this has shake (dithering) and error diffusion method.Can use or use with dither method and error diffusion method separately.
In general, reverse gamma corrector 420 and partly transfer device 430 to use as the necessary funtion part of handling the vision signal of importing to plasma display system, but in one embodiment of the invention, when carrying out this function, by being positioned at the front end of MPD detecting device 440, be converted to the final video signal that the preceding plasma display system of false contouring compensation can show, promptly, from the vision signal of partly transferring device input as the final video signal, when the plasma display system actual displayed, be as judging whether to take place the vision signal of false contouring, even the vision signal that detects the zone that false contouring will take place is used.
MPD value between the pixel that the subdomain mapping code computing of the vision signal of image frame (n-1) was close to mutually before MPD detecting device 440 utilized, thus the MPD zone detected.According to 440 vision signals of utilizing an image frame of MPD detecting device of one embodiment of the present of invention, do not need the subdomain mapping code memory of prior art.And different with prior art, the video signal detection MPD before utilizing between the neighborhood pixels of image frame (n-1) can detect MPD more simply and effectively.Below by Fig. 5 and Fig. 6 this is described in more details.
The MPD that false contouring compensatory zone determining device 450 utilizes the moving area of moving area detecting device 410 inputs to detect information and 440 inputs of MPD detecting device detects information, judges the false contouring compensatory zone of image in the picture of current image frame (n).Here, the false contouring compensatory zone is that moving area also is the MPD zone simultaneously, is called the multiple zone of false contouring in dynamic image.That is, the information of the information of false contouring compensatory zone determining device 450 logical multiplications (AND) computing moving area detecting device 410 inputs and MPD440 input, thus judge whether to be the false contouring compensatory zone.
The vision signal of the false contouring compensatory zone that false contouring compensator 460 false contourings compensation subdomain mapping false contouring compensatory zone determining device 450 is judged.The subdomain mapping construction form of the degree of false contouring occur, promptly change, therefore make the subdomain mapping code of false contouring compensation subdomain mapping code and non-false contouring compensatory zone different along with subdomain mapping code along with vision signal.That is, conversion subdomain mapping code, thus false contouring appears in Min. ground.
Like this, one embodiment of the present of invention have the above-mentioned functions part, detect the false contouring zone and show the vision signal that compensates false contouring, thereby can suppress false contouring when showing dynamic image.
Fig. 5 is the synoptic diagram of explanation according to the operating characteristic of the MPD detecting device of one embodiment of the invention.
As shown in Figure 5, MPD detecting device 500 has subdomain mapper 510, MPD determining device 520 and MPD zone setting apparatus 530.
The vision signal of image frame (n-1) before the mapping of subdomain mapper 510 subdomains.The same with prior art, it is for computing MPD value, the subdomain mapping code of extraction vision signal.In addition, unlike the prior art be to extract and use the subdomain mapping code of the vision signal of an image frame.
MPD determining device 520 utilizes the subdomain mapping code computing MPD value of neighborhood pixels, thereby judges that the MPD value is whether more than the 2nd threshold values of stipulating.For example, as shown in Figure 5, by each subdomain the subdomain mapping code of pixel P (n) contiguous mutually on the space and pixel p (n-1) is carried out XOR (XOR) computing, the result that will draw multiply by the weighted value of each subdomain then, thereby draws the MPD value as mathematical expression 1.Afterwards, more predefined the 2nd threshold values and MPD value judge whether more than the 2nd threshold values.Here, it is the moving direction of considering image that MPD detects, and carries out between contiguous up and down pixel.
The pixel that MPD zone setting apparatus 530 is judged with MPD determining device 520 is the zone that regulation is set at the center, transmits the information of above-mentioned zone as the MPD zone to false contouring compensatory zone determining device 450 then.Like this, for image frame (n-1) before, the mobile degree of considering the image of current image frame (n) is one more than the pixel at least, MPD zone setting apparatus 530 as mentioned above, being the center with the pixel of judging is set at the MPD zone with the pixel of regulation number.
As mentioned above, MPD detecting device 500 has subdomain mapper 510, MPD determining device 520 and MPD zone setting apparatus 530, thereby utilizes the vision signal of an image frame can detect MPD.
Fig. 6 is the synoptic diagram of explanation according to the false contouring region decision method of one embodiment of the invention.
As shown in Figure 6, in one embodiment of the invention, the grey value difference of image frame and current image frame before the computing at first, thus the zone that is moved detected.
And relatively the subdomain of neighborhood pixels p (n) and p (n-1) shines upon code, computing MPD value.When the MPD value when the 2nd threshold values is above, be set at the MPD zone, thereby regard the false contouring generation area in the dynamic image as.At this moment, along with moving direction and size, making the MPD zone is central extension with pixel p (n) and p (n-1).
Afterwards, be that moving area is again simultaneously that the zone that MPD takes place is judged as the false contouring zone.
Like this, in an embodiment of the present invention, the video signal detection MPD of image frame is reflected in it current image frame then, thereby can judges the false contouring compensatory zone before utilizing.For example, as shown in Figure 6, according to moving direction, the gray-scale value of the pixel p (n) of image frame before the gray-scale value of the pixel p of current image frame (n-1) becomes.That is, the gray-scale value of the neighborhood pixels of image frame becomes the gray-scale value of the pixel after moving before.Therefore, even only utilize the vision signal of image frame before, also can detect the MPD of current image frame fully.
As mentioned above, the present invention utilizes from the vision signal of outside input and can detect MPD effectively by improving plasma display system and image processing method thereof.
And, by improving plasma display system and image processing method thereof, can reduce the production unit price.
And, by improving plasma display system and image processing method thereof, in the image that shows, can suppress the animation false contouring.
As mentioned above, in the scope that does not change the technology of the present invention thought and technical characterictic, the staff of the technical field of the invention can implement technology of the present invention with other concrete forms and constitute.
Therefore, embodiment recited above is exemplary in all respects, does not have limited.Patent claim of the present invention is set forth by claims, and all changes or the deformation form that are drawn by equal notion all belong to scope of the present invention.

Claims (16)

1, a kind of plasma display system is characterized in that: it comprises the gray-scale value of the vision signal of the vision signal of image frame before the comparison and current image frame, thus the moving area detecting device of the moving area of detected image;
Utilize the subdomain mapping code of the above-mentioned vision signal of image frame before, the MPD value between the pixel that computing is close to mutually, thereby the MPD detecting device in detection MPD zone;
Utilize the moving area detection information of above-mentioned moving area detecting device input and the MPD of above-mentioned MPD detecting device input to detect information, in the picture of above-mentioned current image frame, judge the false contouring compensatory zone determining device of the false contouring compensatory zone of image;
False contouring compensation subdomain shines upon the false contouring compensator of the vision signal of above-mentioned false contouring compensatory zone.
2, plasma display system according to claim 1 is characterized in that it also comprises: store the image frame storer of the vision signal of image frame before from the outside input in advance.
3, plasma display system according to claim 1, it is characterized in that: the zone of grey value difference more than the 1st threshold values of regulation of the vision signal of the vision signal of image frame and current image frame before above-mentioned moving area detecting device detection is above-mentioned, transmit the information of the zone more than above-mentioned the 1st threshold values to above-mentioned false contouring compensatory zone determining device then as moving area.
4, plasma display system according to claim 1 is characterized in that: above-mentioned MPD detecting device comprises the above-mentioned subdomain mapper of the vision signal of image frame before of subdomain mapping; Utilize the subdomain mapping code computing MPD value of above-mentioned neighborhood pixels, judge the whether MPD determining device more than the 2nd threshold values of stipulating of above-mentioned MPD value; The pixel of judging with above-mentioned MPD determining device is the zone that regulation is set at the center, and transmits the MPD zone setting apparatus of above-mentioned zone as the information in MPD zone to above-mentioned false contouring compensatory zone determining device.
5, according to claim 1 or 4 described plasma display systems, it is characterized in that: it is to carry out between contiguous up and down pixel that above-mentioned MPD detects.
6, according to claim 1 or 3 or 4 described plasma display systems, it is characterized in that: above-mentioned false contouring compensatory zone determining device will be above-mentioned moving area and be that the region decision in above-mentioned MPD zone is the false contouring compensatory zone.
7, plasma display system according to claim 1 is characterized in that: above-mentioned false contouring compensator makes the subdomain mapping code of above-mentioned false contouring compensation subdomain mapping code and non-false contouring compensatory zone different.
8, plasma display system according to claim 1 is characterized in that it also comprises: to the reverse gamma corrector of the above-mentioned vision signal of the reverse gray correction of each image frame; Partly transfer above-mentioned reverse gray correction vision signal partly transfer device.
9, a kind of detection is characterized in that from the image processing method of the plasma display system of the MPD of the vision signal of outside input it comprised with the next stage:
The gray-scale value of the vision signal of the vision signal of image frame and current image frame relatively, the moving area detection-phase of the moving area of detected image;
Utilize the subdomain mapping code of the above-mentioned vision signal of image frame before, the MPD value between the pixel that computing is close to mutually, the MPD detection-phase in detection MPD zone;
Utilize above-mentioned moving area to detect information and above-mentioned MPD area information, judge that in the picture of above-mentioned current image frame the false contouring compensatory zone of the false contouring compensatory zone of image is judged the stage;
False contouring compensation subdomain shines upon the false contouring compensated stage of the vision signal of above-mentioned false contouring compensatory zone.
10, the image processing method of plasma display system according to claim 9 is characterized in that it also comprises: store the image frame memory phase of the vision signal of image frame before from the outside input in advance.
11, the image processing method of plasma display system according to claim 9 is characterized in that: above-mentioned moving area detection-phase comprises: detect above-mentioned before stage in the zone of difference more than the 1st threshold values of regulation of gray-scale value of vision signal of the vision signal of image frame and current image frame; Generate the stage of the zone that above-mentioned the 1st threshold values is above as the information of moving area.
12, the image processing method of plasma display system according to claim 9 is characterized in that: above-mentioned MPD detection-phase comprises: the subdomain of the vision signal of the image frame mapping stage before the subdomain mapping is above-mentioned; Utilize the subdomain mapping code computing MPD value of above-mentioned neighborhood pixels, judge above-mentioned MPD value MPD judgement stage more than the 2nd threshold values of stipulating whether; The pixel of judging with above-mentioned MPD determining device is the zone that regulation is set at the center, generates the stage of above-mentioned zone as the information in MPD zone.
13, according to the image processing method of claim 9 or 12 described plasma display systems, it is characterized in that: it is to carry out between contiguous up and down pixel that above-mentioned MPD detects.
14, according to the image processing method of claim 9 or 11 or 12 described plasma display systems, it is characterized in that: will be above-mentioned moving area and be that the region decision in above-mentioned MPD zone is the false contouring compensatory zone.
15, the image processing method of plasma display system according to claim 9 is characterized in that: make the subdomain mapping code of above-mentioned false contouring compensation subdomain mapping code and non-false contouring compensatory zone different.
16, the image processing method of plasma display system according to claim 9 is characterized in that it also comprises: to the reverse gray correction stage of the above-mentioned vision signal of the reverse gray correction of each image frame; Partly transfer the half accent stage of the vision signal of above-mentioned reverse gray correction.
CNB2006101596116A 2005-12-13 2006-09-26 Plasma display device and image processing method thereof Expired - Fee Related CN100416632C (en)

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