Improved Edge Enhanced Error Diffusion Halftoning Using Local Mean and Spatial Variation

국부 평균과 공간 변화량을 이용한 개선된 에지 강조 오차확산법

  • 곽내정 (목원대학교 정보통신공학부)
  • Published : 2005.04.01

Abstract

The paper proposes the improved error diffusion halftoning system to enhance the edges using the spatial perceptual characteristics of the human visual system. The proposed method computes a spatial variation(SV), which is the difference between a pixel luminance and the average of its $3{\times}3$ neighborhood pixels' luminances weighted according to the spatial positioning. Information of edge enhancement(IEE) Is computed using the SV and the local average luminance. The IEE is added to the quantizer's input pixel and feeds into the halftoning quantizer. The quantizer produces the halftone image having the enhanced edge. The performance of the proposed method is compared with conventional methods by measuring the edge correlation. The halftone images by using the proposed method show better quality due to the enhanced edge. And the detailed edge is preserved in the halftone images by using the proposed method.

Keywords

Halftoning;Error Diffusion;Edge-Enhancement