Transmission of wavelet transform coded TV images on a noisy channel

A compression algorithm for the bit rate reduction of digital TV images using the wavelet transform is described. The TV images are decomposed by the wavelet transform into a lower-resolution signal and high-frequency subbands. Some issues related to the transmission of the compressed TV images on a noisy channel are also analyzed. Channel noise can determine synchronization loss if variable-length codes are employed and, hence, a distortion in the reconstructed images. A technique to recover the synchronization losses is presented. The effects of different channel coding techniques on the reconstructed image quality are also investigated. Computer simulations have been used to characterize the performance of the proposed technique