The image information change law with the change of scale parameter is first studied in terms of regarding ramp edge and step edge as measurement of image information. Then the paper proposes a kind of adaptive recursive algorithm of scale parameter with the module of visual characters. The information of the image is uniformly distributed among each layer in the algorithm. The method can avoid the problem of complicated computation or over- distortion because of losing too much key information. The experimental results show that the uniformly distributed information is more reasonable for hum...
