Some experiments in ADPCM coding of images

This paper is a preliminary report on a study of the application of two-dimensional linear prediction in image quantization. The study has focused on three major concerns: implementation of an adaptive linear predictor, adaptive quantization of the prediction error signal, and the adaptive predictive coding of density (logarithm of intensity) images. The results of the study indicate that through the use of adaptive prediction and quantization, a high level of image fidelity can be obtained for both intensity and density images at information rates well below one bit/pixel.