The real time captions are implemented by using a text-to-speech (captioning or closed captioning) or video-to-text (open captioning or captioning) front end on the TV or PC, so that the text can be displayed automatically. In the case of closed captions, captioning usually utilizes subtitle tracks in the video and sometimes audio tracks, so that the subtitles are displayed in synchronization with the video. Closed captioning also may use a teleprompter for the on-screen display of the text being spoken. When used properly, closed captioning improves the reading and comprehension of the spoken text when compared to a typical still picture or a traditional speech overlay. Real time closed captioning is also used to broadcast the spoken language of non-English-speaking countries and to assist hearing-impaired U.S. citizens in particular.
Open captions, such as in the United States, are transmitted along with the video a few seconds after the spoken language, with the subtitles separated for earlier viewing platforms. Open captioning can also be used for real time captions.
Real time video-to-text conversion, also known as captioning or closed captions, began in the early 1960s, initially as a way to help those who were deaf and hard of hearing to understand television programs. Hollywood closed captions today are generated by computer, but the technology is much the same as it was in the 1960s when the technology was first developed.
The word captioning is applied to descriptions that accompany moving pictures to make the content more accessible to those who are deaf or hard of hearing. CGI shots that duplicate real life or current events are often captured using a motion-sensing camera that is programmed to record the images as they happen in real time. The recorded images may be combined with audio data from the original scene to produce captions that are associated with the still images being recorded. d2c66b5586