Error Diffusion Algorithm for Grey Level Representation on Plasma Display Panel

摘要

The CRT has the nonlinear light intensity response to the input digital values. However, light intensity curve of the PDP is close to linear within the normal operating range. Thus, in order to generate images on the PDP being equivalent to those on the CRT, the modification on the input digital values should be made. This process is often called as inverse gamma correction. When the inverse gamma correction is applied, the number of displayable gray levels in dark areas is considerably reduced. It would result in false contours that reduce the quality of displayed images. Error diffusion can be applied to solve this problem. However, the luminance variation between two consecutive integer values is much greater than 'just noticeable difference' of human vision system. It makes minor pixels appear as isolated dots. In this paper, an error diffusion algorithm is proposed to reduce the luminance variation. Also, three algorithms called in this paper as 'Fraction doubling', 'Minor pixel separation' and 'Within-frame minor pixel allocation' are proposed.