摘要
利用小波变换将图象分解成一组多分辨率子图象，提出了一种改进的编码方案——利用子图象的灰度统计分布特性和人眼视觉特性的分配比特数；采用双金字塔数据结构对图象数据进行编码，充分利用子图象的相似性，进一步减少了数据量。１０幅奶牛图象的平均压缩比达到２６．２，平均信噪比为３０．６ｄＢ，具有较好的图象恢复质量。
wavelet transform is adopted to decompose an image into a group of multiresolution sub images.An improved coding scheme is developed which have considered the gray distribution properties of sub image and human being's vision, image data have been reduced farther by using dual pyramid data structure for sub image coding ,which have great similarity with each other .The mean compression rate and signal to noise ratio for 10 cow's image is 26.2 and 30.6, respectively. The reconstructural quality of image is high.
出处
《中国图象图形学报（A辑）》
CSCD
1997年第8期599-603,共5页
Journal of Image and Graphics
关键词
小波变换
图象编码
金字塔
数据结构
Wavelet transform, Image Coding, Pyramid data structure.
