A New Quantiizer Selection Scheme For Digital VCR

The standard for digital VCR has some features in common with other standards such as JPEG, MPEG, etc., but adopted a far different scheme for quantization of transformed coefficients [I] . The encoder contains a set of quantizers and selects the best of them for each DCT block. The selection of the quantizer is, therefore, the most important part to increase the coding efficiency. The standard defines several parameters, QNO, CLASS, and AREA, to specify the quantization step size for a coefficient. In this paper, we propose a new method to select a quantizer and compare its performance with that of the conventional method. By using the proposed method, we obtained a significantly improved quality of reconstructed image sequences.