Novel encoding schema for high rate image compression for low power requirements in mobile communications

Abstract

With the increasing use of wiretess technologies, image comprission requires higher performance supported with new features to accommodate the bandwidth and low power requirements of personal mobile devices. To address this need in the specific area of still image encoding, this paper introduces a second level compression scheme upon an image, which is already compressed using an existing algorithm. In the proposed technique, error concealment of digital images implemented by adopting the NFD information hiding technique is pedormed in the initial phase, followed by conventional transform based encoding and enuopy encoding to achieve the first stage compression. The main contribution of this paper is the second level compression (named PGR compression by authors) of the entropy encoded image wherein the bit positions of the encoded image are subjected to a mapping procedure with the matched bit positions in a base file (known both the transmitting and receiving mobile devicdstafions) to generate a mathematical function which would tit the mapped data set. The conversion of the original image file in to a mathematical function requiring fewer bits provides very high compression.

Adaptive Localized Curve Tracing Methodology for Efficient Transmission of Audio Streams over Noisy ATM Networks

“…Compression techniques are needed to effectively utilize the bandwidth allocated. Loss less compression techniques such as the source coding procedures with Huffman coding, Shannon Fano, Burrows Wheeler Transforms [4,5,6] are employed for data that are sensitive to loss of information such as low frequency components in a audio/video streams, header information of the packets. However lossy compression techniques [7] avail the advantage of removing not so essential frequency components from the signal providing enhanced compression and hence a bandwidth advantage over its counterpart.…”