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A predictive picture encoding circuit which selectively suppresses and replaces prediction error valves, and a corresponding predictive decoding circuit
A predictive picture encoding circuit which selectively suppresses and replaces prediction error valves, and a corresponding predictive decoding circuit
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机译:选择性地抑制和替换预测误差阀的预测图像编码电路和相应的预测解码电路
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摘要
In a predictive encoding circuit the transmission of prediction errors to the predictive decoding circuit is selectively suppressed and prediction errors having a predetermined value are applied to the prediction circuit in both the encoding circuit and in the decoding circuit, instead of the non-transmitted prediction errors. In order to determine which prediction errors are not transmitted, a masking function value is determined for an actual pixel in the encoding circuit. This is a linear combination of weighted difference between two pixel values of a predetermined cluster of pixels located in the vicinity of the actual pixel. The actual prediction error is not transmitted only if, for example this masking function value is within a certain range and the previous prediction error has been transmitted. In the decoding circuit the masking function values are determined, starting from the regained local pixel values.
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