JPEG compression for a grayscale printing pipeline

Rick A. Vander Kam; Ping Wah Wong; Robert M. Gray

doi:10.1117/12.204133

3 March 1995 JPEG compression for a grayscale printing pipeline

Rick A. Vander Kam, Ping Wah Wong, Robert M. Gray

Proceedings Volume 2418, Still-Image Compression; (1995) https://doi.org/10.1117/12.204133
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

Abstract

We describe a procedure by which JPEG compression may be customized for grayscale images that are to be compressed before they are scaled, halftoned, and printed. Our technique maintains 100% compatibility with the JPEG standard, and is applicable with all scaling and halftoning methods. The JPEG quantization table is designed using frequency-domain characteristics of the scaling and halftoning operations, as well as the frequency sensitivity of the human visual system. In addition, the Huffman tables are optimized for low-rate coding. Compression artifacts are greatly reduced because they are masked by the halftoning patterns, and pushed into frequency bands where the eye is less sensitive. We present experimental results demonstrating that the customized JPEG encoder typically maintains `near visually lossless' image quality at rates below 0.2 bits per pixel (with reference to the final, printed image). In terms of the achieved bit rate, this performance is typically at least 20% better than that of a JPEG encoder using the suggested baseline tables.

Citation Download Citation

Rick A. Vander Kam, Ping Wah Wong, and Robert M. Gray "JPEG compression for a grayscale printing pipeline", Proc. SPIE 2418, Still-Image Compression, (3 March 1995); https://doi.org/10.1117/12.204133

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