| 摘要 |
A method of applying an optical soft edge fall-off in brightness to a projector display channel 4, with known video display rate comprises: assessing the projector exit pupil for its shape and intensity profile; determining the multiple light paths from the projector exit pupil to locations of interest in the projected field; calculating the position, edge profile and magnitude of movement of an optical blend mask 112 to achieve the desired fall in brightness from consideration of the multiple light paths; and controlling the frequency or rate of movement of an optical blend mask such that unwanted visual artefacts are reduced. Optical blend masks are utilised in multi-channel projector systems to ensure that a large projected image composed of sub-images exhibits a uniform brightness. Preferably the mask moves continuously in two orthogonal directions such that the locus of the mask edge describes a circle or ellipse. The cross-section of the mask may be a complex shape such as an ellipse, oval or rugby ball shape. |
