![]() In general, motion information and a residual value of each block, which are an encoding result obtained by encoding each block by using motion compensation, are transmitted to a decoder.A skip mode is a mode in which information about a prediction mode, information about a partition size, information about a reference index, information about a prediction direction, information about a motion vector difference, and residual information are not transmitted.DETAILED DESCRIPTION OF THE INVENTION TECHNICAL PROBLEMTo solve the above and/or other problems, the present invention provides encoding and decoding methods and apparatuses, which increase an encoding efficiency to reduce overhead when encoding is performed by using a plurality of motion information candidate groups in a low bit rate environment. TECHNICAL FIELDThe present invention relates to methods and apparatuses for encoding and decoding an image, and more particularly, to methods and apparatuses for effectively encoding and decoding motion information of a current prediction unit.BACKGROUND ARTRecently, as high definition video contents have become widely used, a need for a video codec having a higher coding efficiency than a conventional video codec such as MPEG-4 H.264/MPEG-4 advanced video coding (AVC) has increased.Thus, a high efficiency video coding (HEVC) standard has been prepared as a next generation video encoding/decoding technology by the joint collaborative team on video coding (JCT-VC).According to motion compensation, which is a technology for removing temporal redundancy in a video signal, compression efficiency is increased by transmitting a residual signal that is a difference value between an original video signal and a reference signal indicated by a motion vector.
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