CL Multiwavelet Image Coding
CL多小波图象编码

CL multiwavelets have some characteristics different from that of other multiwavelets such as the commonly used GHM multiwavelets. After the multiwavelet transformation of an image, most energy of the image is mainly concentrated on its lowest resolution subimage. As for CL multiwavelets, most energy of the lowest resolution subimage is further concentrated on its first component. This implies that the number of most significant coefficients to be encoded in CL multiwavelet image coding is approximately one fourth as many as that in other multiwavelet image coding. However this characteristic of CL multiwavelets as well as its potential possibility of application to image coding have not been mentioned yet. In this paper, we first reveal this characteristic of CL multiwavelets from theoretical aspect and experimental data and then apply this characteristic in CL multiwavelets image coding. We have achieved the results better than that of GHM multiwavelet image coding published so far in terms of compression ratio as well as PSNR.