Research on Feature Extraction Technology of Competition Video Shot

The paper introduces theory of spatial scales as well as the processes of extracting planar SIFT characters in details. Meanwhile, aiming at defects of SIFT features, the paper proposes an improved SIFT characters. Firstly, extract SIFT characters for all frame images in the shot, and then screen them through the thought of spatio-temporal interest point, the process of which can separate parts of movements and background in the shot effectively. The screened SIFT characters can demonstrate video content of sports news in an effective manner. Results of the research indicate that mark precision of marking method in the paper is higher than other approaches.