视频内容敏感的动态字幕

摘要

针对传统方法中固定位置的字幕可能遮挡视频中观众感兴趣内容的问题,提出一种基于视频内容的动态字幕添加方法.通过综合考虑视频内容的重要性、视频画面之间以及相邻字幕间的连贯性来确定视频中视觉相对次要的区域,并在该区域添加字幕,有效地减少了字幕对关键内容形成的遮挡;并提出了随视频内容动态确定字幕颜色以及通过对固定颜色描边2种方式,以增加字幕在视频画面上的对比度.实验结果表明,动态字幕可以有效地避免视频内容遮挡,提高视频播放效果.%In this paper, a novel video content aware dynamic subtitle method is proposed. An energy function, which takes the video content, frame coherence and subtitle coherence into account, is defined and optimized to find an unimportant region in the video image, at which the subtitle is imposed. Two approaches are proposed to increase the contrast between subtitle and video image,i. e. , dynamic subtitle color via color wheel and imposing outer strokes on the subtitles. Experimental results show that the video content aware dynamic subtitles can reduce the critical content occlusion and achieve good visual effects.