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image offset (projector)

The term image offset is used in projection technology. It is the deviation of the center axis of the projection lens related to the total image height.

Image offset is expressed as a percentage. It can be 100% and more, namely when the center axis is outside the image area. If the projector is mounted on a table, the image offset refers to the lower image boundary; if the projector is mounted on a ceiling, it refers to the upper image boundary.

Image offset of 100% and 125

Image offset of 100% and 125

If the projection lens is at the height of the lower image border for table projections, then the image offset corresponds to the entire projected image. It is therefore 100 %. If the projection lens is below the lower image boundary - assumed 10 % below the lower image edge - then the image offset is 10 % plus 100 % of the total image height.

Generally, trapezoidal distortions also occur when the projected light does not strike the projection screen perpendicularly and in the center of the image.

Informations:
Englisch: image offset (projector)
Updated at: 18.04.2014
#Words: 166
Links: image, projection, lens, area, projector
Translations: DE
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