Abstract: Digital halftoning is the process to render continuous-tone images on binary display devices such as printers. Although the transmission of halftone images to printers can be compressed using established lossless protocols, lossy compression methods of the original image can achieve higher efficiencies. We present some experimental work in developing a reversible wavelet-based image compression algorithm that is tuned for halftoning. We also describe a rendering algorithm which is based on the wavelet coefficients from the compressed domain, and which matches the number of dots to the average image intensity at multiple resolutions. Additionally, we address the issue of inverse halftoning using wavelet decompositions of the halftone data. !20
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