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Image information encoding/decoding system

  • US 6,021,226 A
  • Filed: 07/20/1998
  • Issued: 02/01/2000
  • Est. Priority Date: 12/28/1994
  • Status: Expired due to Term
First Claim
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1. A method of encoding an integral body of information which is formed of a plurality of pixel data, each defined by a predetermined number of bits, wherein a data block, containing same continuous pixel data, is compressed as one unit of compression, the integral body of information being arranged on a data line of a finite bit length, the method comprising:

  • specifying the data block of the one compression unit of the integral body of information;

    generating a compressed unit data block in accordance with a coding header corresponding to a continuing number of the same pixel data in the data block of the one compression unit, with a number of pixels followed indicating the continuing number of the same pixel data, and with data representing the same pixel data in the data block of the one compression unit, the generating of the compressed unit data block including;

    assigning no bits to the coding header when a data length of the continuing number of the same pixel data is not greater than four, andassigning at least two but less than a predetermined number of bits to the coding header when the data length of the continuing number of the same pixel data is equal to or greater than four but less than a prescribed number;

    constituting the coding header by a specific number of bits which indicates that the same pixel data continues up to an end of the data line, when the same pixel data in the data block of one unit of compression continues up to the end of the data line; and

    adding dummy bit data to the data block of the one compression unit so that a total bit length of at least one data block of the one compression unit becomes a multiple of eight bits, if the total bit length is not a multiple of eight when generation of the data block of the one compression unit on the data line is completed, whereinsaid integral body of information includes a specific header comprising information of a size of said integral body of information.

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