Abstract:This paperpresent research results on image compression by wavelet transforms and 3-level quad tree coding. We decompose an input image to ( 3 x 3 + I ) subband images using 2 -0 discrete wavelet transforms three times, then arrange the wavelet coeficients to 3-level quad trees. Next we divide the quad trees into zero trees and non-zero trees. Ajier that we draw a root map of zero trees and encode the map by a special MH ( Mod$ed H u m ) code. The process described above enables us to encode 0-amplitude wavele… Show more
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