A DCT-Based Scheme for Lossless Image Compression
نویسندگان
چکیده
In this paper, a new method to achieve lossless compression of two-dimensional images based on the discrete cosine transform (DCT) is proposed. This method quantizes the high energy DCT coeecients in each block, nds an inverse DCT from only these quantized coeecients, and forms an error residual sequence to be coded. Furthermore, a simple delta modulation scheme is performed on the coeecients that exploits correlation between high energy DCT coeecients in neighboring blocks of an image. The resulting sequence is compressed by using an entropy coder, and simulations show the results to be promising and more eeective than just simply performing entropy coding on original raw image data.
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