self-adapted quadtree image compression method proposed by fisher [ 13 ] in-creases the speed of encoding procedure of the image, heightens the compression ratio, but the quality of the reconstructed image is not good fisher提出的自适应四叉树编码方法加快了图象编码的速度,提高了图象的压缩比,但是在图象的重建质量上还存在不足。