New studies on adaptive predictive coding of images using multiplicative autoregressive models

Adaptive predictive coding of digitized images using multiplicative autoregressive (MAR) models is discussed. Three MAR models, designated as nonsymmetric half plane (NSHP) (3*3), quarter plane (QP) (2*3), and NSHP (2*3), are studied in detail. Results demonstrate that both NSHP (3*3) and QP (2*3) are very effective for coding and transmission of such images at bit rates less than one bit per pixel. Comparison with a 2-D model that has a quarter plane 2*2 region of support indicates that the performance of NSHP (3*3) and QP (2*3) either exceeds or matches that of the former. The proposed scheme has the following advantages. First, the signal-to noise ratio and the bit rate attainable with this method are comparable to those of two-dimensional (2-D) predictive techniques. Second, unlike the 2-D schemes, the stability of the predictive coder is easily guaranteed.<
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