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    초록·키워드

    In this paper, bidirectional rounding transforms are developed, in which the forward and backward rounding transform matrices can be interchangeable. A sufficient condition for the conventional rounding transform to be bidirectional as a linear transform is shown and some bidirectional rounding transform matrices are presented as examples. Rearranging these matrices, two other types of triangular rounding transform matrices are derived, which are bidirectional and adaptive to the statistics of images. A macroblock structure of size 4×4 with four basic subblocks is presented for a data compression in subsample based pyramid coding.
    Compared with the conventional block based lossless pyramid structured coding methods for progressive transmission, the proposed rounding transform using triangular matrix with the macroblock structure shows similar performance in the first-order of entropy.

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      UCI(KEPA) : I410-ECN-0101-2009-569-017769518