Improved multiple description wavelet based image coding using Hadamard Transform

A new Multiple Description Transform Coding (MDTC) was proposed by combining the Discrete Wavelet Transform (DWT) and Hadamard Transform (HT). To overcome the inherent drawbacks in the Pairwise Correlating Transform (PCT), which are the computational complexity and hardware implementation, HT was used to introduce an effective redundancy between the descriptions by improving their correlation coefficient. The new approach were analyzed and compared to the conventional scheme in the case of four descriptions by using multiple gray scale test images having different spectral characteristics. The findings show a better performance of the proposed method, especially in the case of two packets lost. In addition, the proposed method ensures a low degradation of the image reconstructed when one packet or two packets are lost. Therefore, the proposed coder provides a good redundancy performance and an easier practical implementation than the classical approach.