Orthogonaltransformationskodierer

摘要

In a data compression encoder for a video signal the degree of influence on visual sensation is detected by obtaining orthogonal transformation coefficients by carrying out an orthogonal transformation in a circuit (2). Depending on the degree of influence on the visual sensation, the quantization step size is controlled by a control circuit (4) so as to assign a greater amount of codes to each block in which the image quality deterioration would be conspicuous and a smaller amount of codes to each block in which the image quality deterioration would be less conspicuous. <IMAGE>