Progressive image transmission

Facsimile and static presentation processing – Facsimile – Recording apparatus

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358133, 358135, 382 56, 364725, H04N 100, H04N 712

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active

046986898

ABSTRACT:
System and method of progressively transmitting and reconstructing an image in which an approximate image is reconstructed based upon partial information and details are added as additional information becomes available. The image is divided into an array of blocks of picture elements and the data for each block is subjected to a two-dimensional transformation to provide transform coefficients thereof. The transform coefficients are quantized into a series of sets of quantized transform coefficients, each quantized transform coefficient being represented by a number of bits. Different numbers of bits are assigned to each quantized transform coefficient of each set of the series to represent the corresponding transform coefficient in increasingly finer detail. During each of a plurality of transmission sequences, signals representing the differences between each set of quantized transform coefficients and the preceding set of the series for each block are transmitted. The signals representing the differences between each set are combined as they are received to provide cumulative quantized transform coefficients for each block in increasingly finer detail after each transmission sequence. The cumulative quantized transform coefficients are dequantized to reconstituted transform coefficients which undergo an inverse of the two-dimensional transformation to provide reconstituted image data for each picture element of each block, the reconstituted image data being of increasingly finer detail after later transmission sequences.

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