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Definition of "approximate coding" |
a process, defined with respect to exact coding, that deals with irreversible and information-lossy processing of two-level pictures to improve compression ratio with significant degradation of picture quality. Exact coding schemes depend on the ability to predict the color of a pixel or the progression of a contour from line to line. Irreversible processing techniques try to reduce prediction errors by maintaining the continuity of the contours from line to line. With predictive coding the number of pixels can be changed to reduce those having nonzero prediction error. With block coding the compression efficiency can be improved by increasing the probability of occurrence of the all zero block. |
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