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Method of detecting a motion vector in an image coding apparatus

  • US 5,398,078 A
  • Filed: 10/30/1992
  • Issued: 03/14/1995
  • Est. Priority Date: 10/31/1991
  • Status: Expired due to Term
First Claim
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1. A method of detecting a motion vector, comprising:

  • a first step for blocking an input image signal to be coded into a plurality of input blocks each consisting of a plurality of pixels;

    a second step for sub-sampling the input image signal at a predetermined pixel interval, to obtain a sub-sampled image signal;

    a third step for obtaining a sub-sampled input block from the sub-sampled image signal;

    a fourth step for searching in a predetermined range the sub-sampled image signal which has already been subjected to a coding process for a primary block most correlated with the sub-sampled input block, to output a primary motion vector which indicates the primary block most correlated with the sub-sampled input block; and

    a fifth step for controlling at least one of a central position of a searching area and a searching pel accuracy in accordance with a type of the primary motion vector, to search for a secondary block most correlated with one of the input blocks, to output a secondary motion vector.

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