Unhierarchical coding of image wavelet coefficients without sending the sign

A new algorithm for embedded image coding is presented. The method used is based on wavelet decomposition. We obtain results only slightly worse than those obtained using the best published algorithms based on the wavelet transform and from these results we assign a relative importance to the relation between the coefficients of different frequency bands. The main characteristics of this new codification are embedded code and coding the transform matrix without sending the sign of each coefficient and without keeping in mind any relation between the coefficients. We apply a successive quantization to the wavelet coefficients and an index to those coefficients greater than the threshold is sent to the decoder.