Method for Encoding/Decoding a Video Sequence Based on Hierarchical B-Picture Using Adaptively-Adjusted Gop Stucture

摘要

Provided is a method for performing hierarchical B picture-based coding on a video sequence using the structure of adaptively divided group of pictures (GOP). The method includes the steps of, for each predefined 2^N frame-sized group of pictures (GOP) of the video sequence, (a) encoding the 2^N frame-sized GOP of the video sequence based on each of the different GOP sizes from the maximum size, 2^N, to the minimum size, 2^M (M is an integer between 1 and N) and obtaining different values between frames reconstructed after the encoding is performed and frames after the hierarchical B-picture prediction is performed, based on each of the different GOP sizes; (b) selecting at least one sub-GOP based on the difference values obtained by encoding the 2^N frame-sized GOP of the video sequence based on each of the different GOP sizes; and (c) generating a bitstream by encoding the 2^N-frame-sized GOP based on the at least one selected sub-GOP. Thereby, the hierarchical B picture-based video coding is performed by adaptively dividing the GOP size based on performance and thereby obtains high coding efficiency.