Method of detecting a motion vector in an image coding apparatus

Details Method of detecting a motion vector in an image coding apparatus Method of detecting a motion vector in an image coding apparatus

1992-10-30

1995-03-14

Chin, Tommy P.

Television

Image signal processing circuitry specific to television

Motion vector generation

348413, 348416, H04N 7137

Patent

active

053980786

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.

REFERENCES:
patent: 4901145 (1990-02-01), Harradine et al.
patent: 5027205 (1991-06-01), Avis et al.
patent: 5128756 (1992-07-01), Johnston et al.
patent: 5208667 (1993-05-01), Saunders

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