DCT-based scheme for lossless image compression

  title={DCT-based scheme for lossless image compression},
  author={G. Mandyam and N. Ahmed and N. Magotra},
  booktitle={Electronic Imaging},
In this paper, a new method to achieve lossless compression of 2D images based on the discrete cosine transform (DCT) is proposed. This method quantizes the high energy DCT coefficients in each block, finds an inverse DCT from only these quantized coefficients, and forms an error residual sequence to be coded. Furthermore, a simple delta modulation scheme is performed on the coefficients that exploits correlation between high energy DCT coefficients in neighboring blocks of an image. The… Expand
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