Picture encoding system

A picture encoding system wherein the picture is divided into blocks, having a plurality of picture elements, comprising:

• a prediction means for predicting picture element values within the blocks, obtaining predicted values, and thereafter obtaining prediction error signals based on differences between the predicted values and true values;
• a discrete sine transform means for carrying out a discrete sine transform with the obtained prediction error signals to obtain transform coefficients;
• a quantization means for quantizing the obtained transform coefficients and obtaining quantized indexes;
• an encoding means for encoding the obtained quantized indexes;
• an inverse quantization means for inversely quantizing the quantized indexes to reproduce the transform coefficients;
• an inverse discrete sine transform means for carrying out an inverse discrete sine transform with the reproduced transform coefficients to reproduce the transform coefficients;
• a reproduction means for reproducing the picture element values within the block by adding the reproduced prediction error signals to the predicted values;
• said prediction means obtaining, through extrapolation prediction, predicted element values for each block to be encoded by employing part of the reproduced picture element values of blocks adjacent to the blocks to be encoded.