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Abstract

A method of detecting a motion vector in an image coding apparatus, including blocking an input image block to be coded into a plurality of input blocks each consisting of a plurality of pixels; sub-sampling a coded image signal to obtain a coded and sub-sampled image signal; sub-sampling the input image block at a predetermined pixel interval to obtain a sub-sampled input block; searching a primary block most correlated with the sub-sampled input block from the coded and sub-sampled image signal in a predetermined range, to output a primary motion vector which indicates the primary block most correlated with the sub-sampled input blocks; and 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 a secondary block most correlated with one of the input blocks from a coded image signal, to obtain a secondary motion vector.

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First Claim