Method for quantizing intra-block DC transform coefficients using the human visual characteristics

摘要

The quantization of intra-block DC transform coefficients is improved through the use of human visual characteristics. The method comprises the steps of converting each of the plurality of blocks included in the input digital video signal into a set of inter-block or intra-block DC and AC transform coefficients; selecting an intra-block DC transform coefficient from said set of inter-block or intra-block DC and AC transform coefficients; determining an intra-block DC quantizer step size based on a set of the selected intra-block DC transform coefficients; and generating a quantized intra-block DC transform coefficient from each of the transform coefficients included in the set of the selected intra- block DC transform coefficient through the use of the intra-block DC quantizer step size.