Method for pre-compensating an asymmetrical picture in a project

Details Method for pre-compensating an asymmetrical picture in a project Method for pre-compensating an asymmetrical picture in a project

1996-11-13

1998-08-18

Dowling, William

Optics: image projectors

Distortion compensation

353 70, G03B 2114

Patent

active

057950466

ABSTRACT:
A method in a projector in which in order to project a clear picture onto a screen without the occurrence of the keystoning, an asymmetrical picture is pre-compensated, is disclosed. In the method for pre-compensating an asymmetrical picture in a projector, when the projection lens of the projector is arranged at an upward or a downward projection angle, regardless of the projection angle, a trapezoidal error of the picture projected onto the screen is pre-compensated in response to the projection angle setting signal from the projection angle setting section, so the picture is normally projected onto the screen. Then, in adjacent compensation blocks of the asymmetrical picture, the position coordinates of deleted pixels are differently determined by a predetermined position transformation function, and thereby the original picture is reproduced with high-fidelity. When pre-compensating the trapezoidal error of an asymmetrical picture, the performance and the structural flexibility of the hardware in the projector are enhanced by using digital circuits and computer software. Therefore, the conventional construction and/or operation of a projector need not be altered.

REFERENCES:
patent: 4422153 (1983-12-01), Arai et al.
patent: 5548357 (1996-08-01), Appel et al.
patent: 5557353 (1996-09-01), Stahl

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