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Definition of "predictive coding" |
compression of a signal by coding differences between samples and predictions from previously coded values. For example, in still image coding, a predictive encoder may predict a pixel by taking the average of the pixel’s left neighbor and its above neighbor. With raster-order coding these values are already available in the decoder, which can form the same prediction. The difference or prediction error values may be quantized. Their probability density function is approximately Laplacian, and further compression can therefore be achieved with entropy coding. Also called differential pulse code modulation. |
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