synthetic highs

A picture compression technique that first filters the picture into a lowpass image and a highpass image and then codes the lowpass image with fewer bits than the highpass image.; 一种图象压缩技术,它首先通过滤波器把图象分为低通图象和高通图象,然后对低通图象用较少的比特数进行编码,而对高通图象用较多的比特数进行编码。