Research On Three-dimensional Subtitle Technology

With the technology development and increasing demand of high quality life, thestereoscopic film, which can capture the real information of the world has attractedheavy attention from the community. The stereoscopic content provides the illusion ofdepth perception and visually stimulating to the viewer, but a new problem imposedby stereoscopic film is eye strain. One key factor is the display of 3D subtitle onstereoscopic image content. The purpose of this paper is to realize a simple,convenient system for overlaying stereoscopic subtitles, thus viewers are able towatch the stereo images and read subtitles mutually with ease and comfort.The research of 3D subtitle technology home and abroad has been carefullystudied and summarized. After analysis of the binocular stereo vision and humanvisual feature, especially, the key influence factors------binocular disparity andconvergence & focus, the paper proposes that the main criteria for overlayingstereoscopic subtitles is the depth of stereoscopic image content. The system is basedon the principle of binocular disparity to overlay three-dimension subtitles by usingthe corresponding relation of 3D subtitles disparity and depth of field. The subtitlesare superimposed at the bottom of the image in terms of the human psychologicalstereo perceive. At the same time, the font attributes of subtitles changes adaptivelybased on the depth placement of image content. For the binocular disparitycomputation of stereoscopic subtitles, an improved dense stereo matching algorithmbased on line-growth is adopted. In order to guarantee the accuracy of the seeds, weadopt Harris corners detection to extract the seeds, and using relaxative iterationmethod to reduce the false match. Finally, we use median filter to eliminate imagenoise and unreliable disparity, thus obtaining clear disparity graph.In conclusion, a system for overlaying stereoscopic subtitles has beenimplemented based on the depth of stereoscopic image content. The experimentsshow that the system for overlaying stereoscopic subtitles, as a quality estimation testplatform, can adjust the disparity and attributes of subtitles conveniently, and enableviewers to read the stereo images and subtitles with ease and comfort.