CN1750097A

CN1750097A - Method for selecting recursive sub field coding

Info

Publication number: CN1750097A
Application number: CN 200510096175
Authority: CN
Inventors: 郭应锋; 王付生; 刘洋; 徐曼
Original assignee: Irico Group Electronics Co Ltd
Current assignee: Irico Group Electronics Co Ltd
Priority date: 2005-10-14
Filing date: 2005-10-14
Publication date: 2006-03-22
Anticipated expiration: 2025-10-14
Also published as: CN100346384C

Abstract

The present invention discloses one kind of sub-field code selecting method capable of minimizing the MPD value between adjacent display units in mobile image of AC PDP to reduce the pseudo contour of moving image and improve image quality. The main technological scheme is that the dynamic code form data searching method includes selecting two codes with minimum MPD value from two highest grey levels and searching code with smaller MPD value successively from the higher grey level to lower grey level based on the code with low grey level. The searched code is used as the data of dynamic code form for searching.

Description

A kind of system of selection of recursive sub field coding

Technical field

The present invention relates to a kind of method of improving the picture quality of AC plasma flat-panel monitor, particularly relate to a kind of system of selection of sub-field code.

Background technology

The AC plasma flat-panel monitor is to keep making alive on electrode X/Y, the addressing electrode A, utilizes at electrode surface discharge, and the luminous image of realizing of excitated fluorescent powder shows.Its gray scale shows and adopts sub-field technology of addressing display separation (ADS technology), i.e. eight sons of a branch, each son are divided into preparatory stage, address period again and keep the phase.

The false contouring phenomenon is because a kind of visual scalloping that the integrating effect of human eye and employing ADS technology combine and produce.We can't go to change for human eye, but can seek the identical coding of light-emitting mode to reduce or to weaken the false contouring phenomenon when seeking to encode.If the individual sub-field energy of n (n＞8) enough realizes 256 kinds of gray shade scales, its coded system kind has 2 ⁿKind.Wherein Rong Yu group/cording quantity is the 2n-256 kind.For each gray shade scale, its redundant group/cording quantity is relevant with weight.For example for 11 son fields, the right to choose series of fortified passes is: 1: 1: 2: 4: 7: 14: 22: 33: 44: 55: 72.Be that 127 coding has 14 kinds then corresponding to gray scale:

10011000000 10100011000 10010110001 10010110010

01101001100 10100010111 01101001011 01011100101

01011100110 10010101111 01100111101 01100111110

00111111101 00111111110

And select another weight relationship 1: 2: 4: 7: 11: 16: 22: 31: 40: 52: 69 o'clock is that 127 coding has 16 kinds corresponding to gray scale then:

11000000110 10100100010 01110000100 10100011000

10010110000 10011000101 01101010010 10010101100

10100010111 01100111001 01101001110 01011100110

10001111010 01011011100 00111111000 00111110111

And if adjacent display unit light-emitting mode differs greatly, main judge index is to calculate the MPD value of adjacent display cell coding, and its formula is:

d _mpd＝|P _i-P _j |×SP ^T-|i-j|

Wherein: d _MpdBe the MPD value of adjacent display cell coding, P _i, P _jBe that gray shade scale is the coding of i, j, SP ^TBe the transposition of weight vectors, i, j are gray shade scales.MPD value between two gray shade scales is big more, and image is when motion, and the false contouring phenomenon is just obvious more.If the gray scale of adjacent cells has multiple coding, we can select two kinds of minimum codings of MPD value so, and when image moved, the false contouring phenomenon will weaken like this.So the dynamic coding method mainly is to seek out some group codings, the MPD value of the adjacent gray shade scale coding of every group coding is as much as possible little.But in search procedure, be difficult to a group coding and make that the MPD value between the adjacent coding all is zero.Traditional coding is chosen and is often adopted the traversal search method, be that every kind of coding of each gray shade scale and all codings of other gray shade scales are done MPD calculating, select the coding of MPD mean value minimum, formed gray shade scale like this and be 256 a group coding and inserted data form for the usefulness of searching.But the MPD value that can occur thus between the adjacent coding can be very big, particularly between the coding that gray shade scale is high if the very big situation of MPD value, the false contouring phenomenon still can produce.

Summary of the invention

The purpose of this invention is to provide a kind of is to make the MPD value between the adjoining display unit of mobile image minimum, improves the system of selection of the sub-field code of moving image quality with the false contouring that weakens moving image.

For achieving the above object, the present invention takes following technical scheme to be achieved:

Employing is from selecting two kinds of minimum codings of MPD value between the highest two gray shade scales, then with grade little be encoded to benchmark, order from high to low is to a kind of dynamic coding list data finding method of the lower direction finding MPD value of gray shade scale than lower Item successively.With the coding that seeks data, for the usefulness of searching as the dynamic coding form.

Concrete technical scheme is, a kind of system of selection of recursive sub field coding, be 255 from gray shade scale earlier, what the direction that reduces to gray shade scale was encoded successively chooses, each gray shade scale coding carries out MPD calculating with all codings of next gray shade scale, select wherein minimum MPD value corresponding codes, carry out calculation of coding and choose with same method downwards successively then.Above-mentioned stepping type choosing method can select a lot of group codings, and these group codings are exactly the content in the data form of dynamic coding method.

The beneficial effect of method of the present invention is by seeking the content of the minimum coding of MPD value between the adjacent gray scale as dynamic coding method look-up table, the dynamic coding method that this method adopted is sought the approaching coding of light-emitting mode, make the MPD value of adjacent display unit control within the specific limits, thereby reduced the false contouring of moving image.In addition, the MPD value that adjacent gray shade scale is encoded is only calculated in choosing of coding, makes the calculated amount of choosing of coding reduce greatly.

Description of drawings:

Fig. 1 is that coding of the present invention is selected the step block diagram.

Fig. 2 is that the present invention selects back gray shade scale corresponding codes form by the MPD value.

Embodiment

The present invention is described in further detail below in conjunction with drawings and Examples:

For 11 son fields, coded system has 2 ¹¹=2048 kinds, if can realize 256 grade gray scales, then wherein redundant coded system has: the 2048-256=1792 kind.So we can select some group codings, the method for selecting is to be 255 from gray scale, selects coding successively downwards.Because gray scale 255 has only a kind of coding, so can be to choose the minimum coding of MPD value 254 from gray scale.If gray scale is to have the MPD value of the coding calculating of several encoding and gray scale 255 to equate and minimum (situation that may occur in the reality) in 254, then these codings all can be elected, as some groups, then successively with the searching downwards of these codings.In every group of coding of choosing out, because the MPD value of adjacent encoder is very little, so within the specific limits, the MPD value between the different gray shade scale codings can be very not big yet, when this has just guaranteed with these group codings as the content of data look-up table, can improve the moving image false contouring.

As shown in Figure 1, for being 255 from gray shade scale, what direction 254,253, the 252... that reduces to gray shade scale encoded successively chooses.All codings 1 of each coding 1,2... and next gray shade scale, 2... carry out MPD and calculate, and select wherein minimum MPD value corresponding codes i, j, k..., then successively downwards with choosing that same method is encoded.

As shown in Figure 2, the corresponding different gray shade scales of the coding of its data look-up table.Coding wherein is select after calculating through the MPD value.

Claims

1. the system of selection of a recursive sub field coding, it is characterized in that, be (255) from gray shade scale earlier, successively to direction (254), (253), (252) that gray shade scale reduces ... that encodes chooses, each gray shade scale coding (1), (2) ... all codings (1), (2) with next gray shade scale ... carrying out (MPD) calculates, select wherein minimum (MPD) value corresponding codes (i), (j), (k) ..., carry out calculation of coding and choose with same method downwards successively then.

2. the system of selection of recursive sub field coding according to claim 1 is characterized in that, described coding (i), (j), (k) ... be used as corresponding to gray shade scale (254), (253), (252) ... data look-up table.

3. the system of selection of recursive sub field coding according to claim 1 is characterized in that, (MPD) value that adjacent gray shade scale is encoded is only calculated in choosing of described coding.