Abstract

A combined-transform-coding (CTC) method that reduces the blocking effect of the baseline two-dimensional discrete-cosine-transform (DCT) coding scheme is proposed. Several computer simulation results are presented to demonstrate the improvement provided by the CTC scheme in subjective quality. It is pointed out that the idea of combined coding (CC) can also be used in noiseless coding. Experimental results show that the compression performance for CC is better than that of coding an image as a whole. Several experimental results are tabulated for a set of chest anterior-posterior (AP) view X-ray images. The advantages of the CTC scheme include no ringing effect due to no error propagation across block boundaries, no additional computation, and the ability to hold distortion below a certain threshold. >

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