Comparison of nth-Order DPCM Encoder With Linear Transformations and Block Quantization Techniques

Two important classes of coding schemes that use the spatial correlation of picture elements in reducing data redundancy are the differential pulse-code modulation (DPCM) and the unitary transform coding techniques. We will study the performance of an
n
th order DPCM system for
n
ranging from 1 to 22 and compare it to the performance of the unitary-transform techniques (Hadamard, Fourier, and KarhunenLoève) in coding two monochrome still pictures. We will also consider the sensitivities of the coding systems to picture-to-picture variations.