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Band compression device for shaded image

  • US 4,454,546 A
  • Filed: 03/10/1981
  • Issued: 06/12/1984
  • Est. Priority Date: 03/13/1980
  • Status: Expired due to Term
First Claim
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1. A band compression method for a shaded image in which a sampled input picture element value and an estimation error obtained from an estimation value of said input picture element value are converted into quantization values and coded, comprising the steps of:

  • (a) determining a difference between an input picture element value and a present estimate of said input picture element value;

    (b) converting said estimation error into a quantization value in correspondence to said input picture element;

    (c) converting said quantization value into a quantization code corresponding to said estimation error and quantization value;

    (d) estimating the next input picture element value with said quantization value;

    (e) storing said quantization code in a buffer memory;

    (f) when a block of a predetermined number of said quantization codes has been stored in said buffer memory, reading out said quantization codes from said buffer memory in bit planes, each of said bit planes consisting of like-ordered bits of said quantization codes;

    (g) converting the data contained in each of said bit planes into run-length codes by run-length encoding said data contained in each of said bit planes;

    (h) transmitting said run-length codes to a receiving station; and

    (i) converting receiving run-length codes to a visual image at said receiving station.

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