According to the latest data on the official website of the World Health Organization, there are about 466 million people with hearing impairments around the world, including about 34 million children. What does “466 million people” mean? This number is more than the total population of the United States, almost more than 5% of the world's population. Moreover, this number is expected to reach 900 million by 2050. By providing closed captions, SDH subtitles, audio description, and sign language solutions, we enable people to embrace the beauty of the world through these assistive technologies.
A closed caption is a caption file that the audience can choose to open or close. A closed caption is a separately created text file, which is then fitted into and synchronized with the video. A caption is transmitted through the decoder. Because a closed caption is a separate file, we can quickly and easily edit, correct and re-upload it, especially compared to open captions already inserted in videos. As we are required to identify errors in captions and provide updates, which means that we will need to create the entire video file. Therefore, closed captions will be more convenient to us, when it comes to caption revisions or updates. Closed captions are mostly written in the language set for the video. A good example is when you watch films or shows through Netflix and open subtitles, i.e. closed captions.
To add subtitles to a video or any audiovisual content for hearing-impaired people, it is necessary to generate a subtitle file that is created specifically for them. The sound is described, and the subtitles are displayed in different colors to indicate the characters uttering the words, as well as other special features. SDH is usually located in the center and the “lower third” portion of the screen. In addition to presenting dialog with characters, SDH subtitles also need to indicate background sounds (of doorbells, footsteps, explosions), etc., making it easy for hearing-impaired people to understand the content.
On-screen narration is added to provide a narrative, descriptive service for the visual impaired, or the audience who want to study the language. Audio description, also known as video description or description of video services (DVS), is a descriptive description of on-screen operation, visual cues such as characters and costumes, or text that appears in graphics or videos.
Body movements, facial expressions are used to convey meaning in the language used, to help people with hearing or speech impairments understand and digest video content, and assist them in perceiving the world and its beauty.
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