Abstract
Some error-free and irreversible data compression techniques applied to radiographic images are discussed in this paper. In the case of error-free compression, clipping and bit trunction, run-length coding, run-zero coding and Huffman coding are reviewed. In each case, an example is given to explain the steps involved. In the case of irreversible compression, the full-frame bit allocation in cosine transform domain method is described. Utilizing these compression techniques, we have compressed more than one hundred of radiographic images of different types. Our experience reveals that (a) it is possible to obtain a 3:1 compression ratio for error-free methods, and (b) for irreversible compression, the compression ratio achieved depends on the image type, the image size and the number of bits per pixel. In general, for a 512x512x8 image a 10:1, and for a 1024x1024x8 a 16:1 compression ratio can be achieved. Reconstructed images from these high compression ratio data do not appear to have visual degredation from the original image.
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