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image offset

The term image offset is used in projection technology

. It is the deviation of the center axis of the projection lens relative to the total image height. The image offset is given as a percentage and can be 100% or 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 border, if the projector

is mounted on a ceiling, the image offset refers to the upper image border.

Image Offset of 100% and 125%

Image Offset of 100% and 125%

If the projection lens is at the level of the lower image border for table projections, the image offset corresponds to the entire projected image

. It is therefore 100 %. If the projection lens isbelow the lower image boundary - assuming 10 % below the lower image edge - then the image offset is 10 % plus 100 % of the total image height.

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

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Englisch: image offset
Updated at: 18.04.2014
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