关键词: 图像缩小, 自适应, 局部区域方差, 加权平均, 均值滤波器

Abstract: A self-adaptive amending algorithm of image zooming-out based on weighted averaging image sub-block is presented in this paper.This algorithm effectively retains the integrity of gray image information.First，low-resolution image obtained by weighted averaging for image zooming-out is disposed by the way of contrast extension .Then the algorithm takes account of the influence on the whole image information by local area variance and self-adaptively amends the every pixel value of low-resolution image.Experimental results demonstrate that the algorithm can more effectively avoid blurring and artifacts edges than only by the method of weighted averaging for image zooming-out，and generate high quality images.Especially，the visual quality of the images for the large ratio of image zooming-out is more prominent.

Key words: image zooming-out, self-adaptive, local area variance, weighted average, average value filter