Detection and correction of transmission errors in pyramid images

Two detection and correction approaches to protection from transmission errors in pyramid images are proposed. For entropy-coded pyramid images, a single transmission error in a codeword will not only affect the underlying codeword, but also may affect subsequent codewords. Consequently, a single error in an entropy-coded system may result in significant degradation. Two types of variable-length codes with the synchronization capability are proposed to encode two types of pyramid images, namely, the difference pyramid and the reduced-difference pyramid, to overcome the synchronization problem. The proposed approaches detect transmission errors by examining error checking conditions. When a transmission error is detected, a sequence of bit inversions and redecoding processes is performed on the corrupted part of the compressed image bitstream until a feasible redecoding solution is found. The simulation results show significant quality improvement.