Video Mapping / Warping
Definition
Video mapping, or warping, is the reshaping of a video output so that it fits an irregular projection surface or LED structure. Keystone correction adjusts the four corners of the image; done digitally, it resamples the picture and reduces the number of pixels used for the image. Mesh warping corrects the geometry across a grid of control points and follows curved or complex surfaces more closely. Edge blending overlaps several projectors and fades the overlap zones. On LED walls, mapping places content on custom cabinet layouts, cut-outs and curved surfaces.
In the field
Digital correction consumes part of the projector's resolution, so the usual order is to position the projector and the surface physically first and to apply keystone or mesh warping afterwards. Optical lens shift, where available, moves the image without resampling it. A projector placed well off axis, for example at 10°, loses a noticeable part of its usable resolution once corrected.
Related lessons
Sources
- Wikipédia, Keystone effect : correction de trapèze numérique et perte de résolution (pointeur secondaire) · en.wikipedia.org
- Wikipédia, Projection mapping : projection sur surfaces irrégulières (pointeur secondaire) · en.wikipedia.org
- Wikipédia, Image geometry correction : correction géométrique et fondu de bords des projecteurs (pointeur secondaire) · en.wikipedia.org
- disguise, User Guide, Warping Outputs : déformation (warp) des sorties dans le média serveur à la place du keystone du projecteur · help.disguise.one
- disguise, User Guide, Blending and Masking Outputs : fondu de bords entre projecteurs · help.disguise.one