裏窓
Rear Window captioning is an alternative to open captioning, in which text is permanently visible. Open captioning has been little-used due to the fear that it was too intrusive and noticeable to hearing viewers. However, no studies have been conducted to elicit hearing people's opinions on how they will adapt to reading captions on screen. Rear Window captioning is a form of closed captioning because the viewer must choose to view the captions.