Concealment of damaged blocks by neighborhood regions partitioned matching
This paper presents a new error concealment algorithm for the masking of damaged blocks due to data loss during the transmission of DCT based images over a packet network. The algorithm is called neighborhood regions partitioned matching (NRPM). Instead of repairing damaged block as a whole, each damaged block is divided into a number of sub-blocks. Each sub-block is recovered utilizing not only the surrounding pixels, but also remote pixels which share similar local image characteristics. The approach yields good a quality repair and since smaller block size is used, it can significantly reduce the computational time for the reconstruction process.