A system and method for recompressing a JPEG image using requantization is described. DCT transform coefficients for a compressed JPEG image are statistically analyzed to generate a stored numeric error representation. Local minimizers are determined from the stored numeric error representation with selective rounding. A new quantization matrix Q1 is selected from the local minimizers bounded by a target quantization matrix Qbound. The compressed JPEG image is recompressed using the new quantization matrix Q1.

 
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< Image compression device and image uncompression apparatus utilizing the same

< Distortion-adaptive visual frequency weighting

> Non-traditional adaptive non-uniformity compensation (ADNUC) system employing adaptive feedforward shunting and operating methods therefor

> Methods and systems for improving display resolution using sub-pixel sampling and visual error compensation

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