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An MPEG-based image contrast enhancement algorithm for people with low vision is presented. Contrast enhancement is achieved by modifying the inter-and intra-quantization matrices in the MPEG decoder during the decompression stage. The algorithm has low computational complexity and does not affect the MPEG compressibility of the original image. We propose an enhancement filter based on the visual characteristics of low-vision patients, and report the results of preference experiments with 24doi:10.1117/1.1723493 fatcat:e3rdxhhe3zfxpor7svfel7uwxu