Motion vector encoding/decoding method and device and image encoding/decoding method and device using same

Abstract

The present invention relates to a motion vector encoding / decoding method and device and an image encoding / decoding method and device using the same. The invention provides the motion vector encoding method comprising the steps of: selecting a predictive motion vector candidate set which includes one or more predictive motion vector candidates for a block; determining a search range for the predictive motion vector candidate set; selecting one predictive motion vector candidate of the one or more predictive motion vector candidates as a predictive motion vector candidate in accordance with each search point, according to the image decoding device and a first determination standard which is previously appointed for each search point within the search range; determining a predictive motion vector, a differential motion vector, and a current motion vector by selecting one predictive motion vector candidate of the predictive motion vector candidates in accordance with each search point, according to the image decoding device and a second determination standard which is not previously appointed; and generating and encoding the differential motion vector as motion information. According to the present invention, motion vectors are encoded by using more accurate predictive motion vectors, and there is no need to add information for identifying the predictive motion vectors to the encoded data, thereby improving the motion vector encoding efficiency.

Description

technical field [0001] The present invention relates to a method and device for encoding / decoding motion vectors and a method and device for encoding / decoding video using the method and device. More specifically, the present invention relates to encoding a motion vector using a more accurate predicted motion vector without adding information related to the predicted motion vector used to encode the motion vector in the encoding or decoding of video. A method and device for achieving higher encoding efficiency in the field of video compression. Background technique [0002] A motion vector encoding and decoding method commonly used in the field of video encoding and decoding performs predictive encoding of a current motion vector with respect to a corresponding motion prediction block by using motion vectors of spatially positioned surrounding blocks as predicted motion vectors. In other words, since the motion vector of the current block (hereinafter referred to as the "cur...

AI Technical Summary

Problems solved by technology

The foregoing method can improve coding efficiency by using a predicted motion vector most similar to a current motion vector among motion vectors of neighboring blocks available in time-space, but also requires coding additional information of the used predicted motion vector, so that Coding efficiency drops

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