Lossless compression rate obtained on the error-diffusion image is very low, and the conventional binary image lossy coding techniques can provide bad visual quality on these images, which lead to investigate lossy compression based on the inverse halftone method. A looking up table inverse halftone method is used to convert error-diffusion image back to the contone image. An improved DCT coding algorithm is constructed to get higher compression rate. A lossy compression method of error-diffusion image is proposed. Experimental results show that the proposed algorithm fits to the error-diffusion image, and the quality of the decoding image is well.
error-diffusion halftone image,
looking up table inverse halftone,