Combined Adaptive and Averaging Strategies for JPEG-Based Low Bit-Rate Image Coding

A commonly recognized weak point of the DCT-based transform coding is its blocking effects which become increasingly visible in the low bit-rate territory. In the first part of this paper, motivated by a recent work of Bruckstein, Elad, and Kimmel (BEK) [1] and by the progress from [3], we propose a combined adaptive technique that can be applied to a BEK type of transform coding system for performance improvement. In the second part of the paper, motivated by a recent work of Tsaig, Elad, Milanfar, and Golub (TEMG) [2], we investigate an averaging technique for the design of optimal interpolation filter that can be utilized in a TEMG type system framework for further performance improvement. Simulation results are presented to demonstrate the effectiveness of the two proposed methods.