×

Moving picture coding and/or decoding systems, and variable-length coding and/or decoding system

  • US 5,852,469 A
  • Filed: 03/15/1996
  • Issued: 12/22/1998
  • Est. Priority Date: 03/15/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A variable-length coding system for assigning, to a plurality of source symbols, a code word of a code length corresponding to an occurrence probability of each of the source symbols, and for outputting coded data corresponding to an inputted source symbol, said variable-length coding system comprising:

  • a code word table for storing a plurality of code words corresponding to respective source symbols, the code words being able to be decoded in either of a forward direction and a backward direction; and

    coding means for selecting a code word corresponding to the inputted source symbol from said code word table if a code word corresponding to the inputted source symbol is stored in said code word table, and for generating a code word comprising an escape code including a prefix and a suffix added to a predetermined code representing the inputted source symbol when no code word corresponding to the inputted source symbol is stored in the code word table, the escape code being decodable in either of a forward and a backward direction, is added to the a prefix and a suffix of a fixed-length code, when the code word corresponding to the inputted source symbol has not been stored, and for outputting coded data corresponding to the inputted source symbol and comprising one of a selected code word and a generated code word.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×