Lossy Compression of Stochastic Halftones with JBIG2

The JBIG2standard supports lossless and lossy coding models for text, halftone, and generic regions in bi-level images. For the JBIG2 lossy halftone compression mode, halftones are descreened before encoding. Previous JBIG2 descreening implementations produce high-quality images for clustered dot halftones at high compression rates but signi cantly degrade the image quality for stochastic halftones, even at much lower rates. In this paper, we develop 1 a exible, computationally e cient, JBIG2-compliant method for compressing stochastic halftones that reduces noise, artifacts, and blurring; 2 quality measures for linear and nonlinear distortion in compressed halftones; and 3 rate-distortion tradeo s for the encoder parameters.

• Type: Conference
• Year: 1999
• Where: ICIP
• Authors: Magesh Valliappan, Brian L. Evans, Dave A. D. Tompkins, Faouzi Kossentini
• Keywords: ICIP 1999, Image Processing, Lossy Coding Models, Lossy Halftone Compression, Stochastic Halftones