关键词: 影像金字塔, 六边形, 正交变换, 图像压缩

Abstract: The hexagonal orthogonal transform is based on modeling the mechanism of human vision transfer process,with properties of biological,pyramid structure,self-similar,and efficient,so that hexagonal image pyramid can be obtained directly.The base functions of the transform are orthogonal,self-similar and localized in space,spatial frequency,and orientation.This paper,based on the hexagonal sampling technologies and the idea of wavelet zero-tree compression,has introduced a new method of image compression that is based on hexagonal orthogonal image pyramid,and tried to apply it to transmission and manipulation under narrow band.This algorithm has such advantages as high speed and high efficiency of coding,and could compress image better than traditional algorithm based on rectangle sampling,guaranteeing given accuracy.

Key words: image pyramid, hexagon, orthogonal transform, image compression