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.; 一種圖象壓縮技術,它首先通過濾波器把圖象分為低通圖象和高通圖象,然后對低通圖象用較少的比特數進行編碼,而對高通圖象用較多的比特數進行編碼。