Recursive Block Coding for Image Data Compression

Recursive Block Coding, a new image data compression technique that has its roots in noncausal models for 1d and 2d signals, is the subject of this book. The underlying theory provides a multitude of compression algorithms that encompass two course coding, quad tree coding, hybrid coding and so on. Since the noncausal models provide a fundamentally different image representation, they lead to new approaches to many existing algorithms, including useful approaches for asymmetric, progressive, and adaptive coding techniques. On the theoretical front, the basic result shows that a random field (an ensemble of images) can be coded block by block such that the interblock redundancy can be completely removed while the individual blocks are transform coded. On the practical side, the artifact of tiling, a block boundary effect, present in conventional block by block transform coding techniques has been greatly suppressed. This book contains not only a theoretical discussion of the algorithms but also exhaustive simulation and suggested methodologies for ensemble design techniques. Each of the resulting algorithms has been applied to twelve images over a wide range of image data rates and the results are reported using subjective descriptions, photographs, mathematical MSE values, and h-plots, a recently proposed graphical representation showing a high level of agreement with image quality as judged subjectively. Front Matter....Pages i-xxviii Introduction....Pages 1-7 RBC—The Theory behind the Algorithms....Pages 9-52 Bit Allocation and Quantization for Transform Coding....Pages 53-94 Zonal Coding....Pages 95-154 Adaptive Coding Based on Activity Classes....Pages 155-189 Adaptive Coding Based on Quad Tree Segmentation....Pages 191-224 QVQ—Vector Quantization of the Quad Tree Residual....Pages 225-240 Conclusions....Pages 241-247 Back Matter....Pages 249-297