Abstract: Video compression is achieved by leaving out unnecessary information in an image. This is done by leaving out information that can be predicted (entropy encoding) or by leaving out information the visual system cannot use. Entropy encoding procedure on exact replica of the original image until the image unpredictability exceeds the channel capacity - at which point it fails. Entropy encoding has been discussed widely in the literature. Encoding based on the limits in perception produces an image in which there are measurable differences between the original and reconstructed image. However, these differences are kept below the thresholds of perception. A wealth of information exists in the vision research community on perception thresholds for various visual stimuli. This paper will review these perception limits and show how they have been used or may be used in visually lossless compression.!9
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