EN: Keystoning (stereoscopic)
When a camera or projector film plane is not parallel to the subject or screen, a trapezoidal shape is created (a rectangle with a wider top than bottom, for example). With a stereoscopic image, where the two cameras are toed-in, mismatching of the outlines or borders of the two images.
Canon glossary us
Distortion of a projected image when the projector is not directed perpendicular to the screen.
Cel Mai folosit cuvant: distortion | Domeniu Aplicare : Fotografie | Caractere: 80 Cuvinte: 16 | Limba: Engleza | Sursa Photo Tips
The apparent unparalleling of parallel lines as a result of not shooting a building or framed picture at a perpendicular (90°) angle. The same phenomenon can occur with projected images.
Cel Mai folosit cuvant: apparent | Domeniu Aplicare : Fotografie | Caractere: 154 Cuvinte: 30 | Limba: Engleza | Sursa Tiffan edu Glossary