METHOD AND APPARATUS FOR ENCODING VIDEO SIGNAL WITH IMPROVED COMPRESSION EFFICIENCY USING MODEL SWITCHING OF SUB PIXEL'S MOTION ESTIMATION

摘要

A video signal encoding apparatus for increasing the compression efficiency through the model switching when performing a sub pixel motion estimation and a method thereof are provided to encode a video signal by the selection of a model among plural models. A motion vector of a reference pixel is calculated first(S310). When calculating a motion vector of a half pixel, a motion vector of an integer pixel as the reference at the circumference is calculated. An estimation model is produced with x and y values as the motion vector calculation result(S320). After producing two or more models, a motion vector of a sub pixel is estimated. A process for comparing the calculated value with an error of a sub pixel is performed(S330). The motion estimation is performed by the application of the model with a small error(S350).