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    • 6. 发明授权
    • Arrangement for transforming picture data
    • US06681051B1
    • 2004-01-20
    • US09556546
    • 2000-04-24
    • Dirk HoppeDetlef Götting
    • Dirk HoppeDetlef Götting
    • G06K936
    • G06T9/007
    • In an arrangement for transforming picture data while using a method of two-dimensional hierarchic sub-band segmentation, particularly a two-dimensional Discrete Wavelet Transformation (2-D DWT), in which pictures, possibly in a plurality of planes, are segmented into sub-bands by means of filtering, a minimal storage space, a minimal bus load and an optimal 2-D DWT transformation ensure that a picture memory (41) is provided in which the data of a picture are stored prior to the start of the first transformation plane and in which the data of a further sub-band to be transformed are stored after the first transformation plane, in which process the data of the picture are partially overwritten, in that the data of a possible further sub-band to be segmented are stored in the picture memory (41) after every further transformation plane, in that a sub-band memory (44) is provided in which, after a transformation process of a plane, the data gained during this transformation of those sub-bands which are no longer to be segmented in further transformation planes are stored, which data of said sub-band are stored adjacent to each other and in which sub-band data determined in previous transformation planes and possibly already stored in the sub-band memory (44) are not overwritten, in that, in the transformation planes, the data of the picture or the sub-band data stored in the last transformation plane are read from the picture memory, which data are read in blocks (32) comprising a basic block (33) having a size corresponding to the picture section or sub-band to be transformed, and a frame (34) surrounding said picture section and having a width corresponding to half the maximum filter depth of the filters (12, 13, 16, 17, 20, 21) used for the transformation, and in that all basic blocks (33) combined cover all pixels of the picture or sub-band data in the picture memory (41).