A new image noise suppression method using complex Gaussian scale mixtures(CGSM)in quad-tree complex wavelet packets transform(QCWPT)domain is presented.The noisy image is decomposed into a low frequency approach sub-image and some high frequency directional sub-images via the QCWPT.In the large sacle,the low frequency approach complex sub-image is looked as signal coefficients and retained unchangeably.The best complex wavelet packet basis is determined by using logarithm entropy cost function in high freq...