Abstract
This paper describes a new algorithm for adaptive selection of DCT quantization parameters in the JPEG compressor. The quantization parameters are selected by classification of blocks based on the composition of fine details whose contrast exceeds the threshold visual sensitivity. Fine details are identified by an original search and recognition algorithm in the N-CIELAB normalized color space, which allows us to take visual contrast sensitivity into account. A distortion assessment metric and an optimization criterion for quantization of classified blocks to a high visual quality are proposed. A comparative analysis of test images in terms of compression parameters and quality degradation is presented. The new algorithm is experimentally shown to improve the compression of photorealistic images by 30% on average while preserving their high visual quality.
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Sergei Vladimirovich Sai. Born 1960. Graduated from the Tomsk University of Control Systems and Radioelectronics in 1983. Received candidate’s degree in 1990 and doctoral degree in 2003. Head of the Department of Computer Science at the Pacific National University. Scientific interests: digital processing, analysis, and recognition of images. Author of 98 papers, including 3 monographs and 16 papers in journals indexed in Scopus and Web of Science.
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Sai, S.V. Optimizing the Quantization Parameters of the JPEG Compressor to a High Quality of Fine-Detail Rendition. Pattern Recognit. Image Anal. 28, 71–78 (2018). https://doi.org/10.1134/S1054661818010157
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DOI: https://doi.org/10.1134/S1054661818010157