and non-face regions from a video signal received at the video encoder of FIG. 3; [0041]FIGS. 5A and 5B illustrate examples of images displayed on the screen, to which the quantizer of FIG. 3 applies different quantization step sizes to a face region and non-face regions over the entire image; and [0042]FIG. 6 illustrates a method for compressing a video signal by a video encoder according to a p