Patent Number: 6,480,670

Title: Video signal encoding method and system

Abstract: In an image signal encoding method for encoding an image signal using motion compensation, a motion vector is found by means of a block matching method, a first distortion SEmc of motion compensated prediction associated with the motion vector, and a second distortion SEnomc of prediction without motion compensation are detected, the motion vector is used for for inter-picture prediction encoding when SEnomc>SEmc+K, with K being a constant greater than 0, and a vector having a value zero is used, in place of the motion vector, for inter-picture prediction encoding when SEnomc.ltoreq.SEmc+K. In another aspect, a speed of motion in a sequence of pictures is detected, and for a part of the sequence of pictures detected to contain a quick motion, the prediction encoding is performed using one-way prediction encoding, and for a part of the sequence of pictures without a quick motion, prediction encoding is performed using bi-directional prediction encoding. In another aspect, the image signal is subsampled for each field, and a motion vector is determined using the field-subsampled image signal.

Inventors: Hatano; Yoshiko (Nagaokakyo, JP), Kasezawa; Tadashi (Nagaokakyo, JP), Okazaki; Koji (Nagaokakyo, JP), Shinohara; Takashi (Nagaokakyo, JP), Hasegawa; Hiromu (Nagaokakyo, JP), Mishima; Hidetoshi (Nagaokakyo, JP)

Assignee: Mitsubishi Denki Kabushiki Kaisha

International Classification: G06T 9/00 (20060101); H04N 7/46 (20060101); H04N 7/26 (20060101); H04N 5/14 (20060101); H04N 007/36 ()

Expiration Date: 11/12/2019