关键词: 视频字幕提取, 边缘检测, 颜色建模, 文字掩码图

Abstract: In order to extract caption in digital video, this paper presents a method which utilizes many features of caption such as temporal and spatial, edges, color. The caption’s regions are located by detecting edges so text’s colors are known. Universal Gaussian Mixture Model（GMM） is trained for text’s color. The color layer of texts is extracted based on the trained GMM. The method to judge whether content of caption changes is to add mask bitmap to frame. Experiments show that this method performs well even if the background is complex and the color of caption is not single.

Key words: video caption extraction, edge detection, color modeling, text mask bitmap