PROJECTION SYSTEM WITH CONTRAST HOMOGENEITY CORRECTION

摘要

The invention relates to a projection system ( 10 ) for projecting an image onto a screen ( 16 ). The system ( 10 ) comprises a main video projector ( 14 ) arranged to project a main image onto the screen ( 16 ), and further a contrast correction projector ( 12 ) arranged to project a correction image onto the screen ( 16 ) to compensate for imperfections in the image projected by the main video projector ( 14 ). The correction projector ( 12 ) may be a cheap and simple projector using for its light source light emitting diodes or stray light from the main projector. Typically, the correction projector ( 12 ) gives a steady image on the screen ( 16 ), only compensating for the imperfections in the main image displayed by the main projector.