Image signal quantizing method and apparatus

摘要

In a method of and apparatus for quantizing image signals, an image is divided into a plurality of minute unit regions in the course of quantization of image signals. The image signals in the respective minute unit regions are quantized by applying a plurality of such quantization characteristics that the numbers of levels after quantization are approximately equal to each other and positions of quantization steps are deviated from each other in the quantization width direction. The quantization characteristics are changed over for the respective minute unit regions.