Method and apparatus for adjusting multiple projected raster ima

Details Method and apparatus for adjusting multiple projected raster ima Method and apparatus for adjusting multiple projected raster ima

1997-05-30

2000-09-05

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

348383, G09G 500

Patent

active

061150223

ABSTRACT:
A three dimensional smoothing factors lookup table provides detailed control over the full two dimensional space of a composite image composed of multiple projected raster images. The overall displayed image is improved by adjusting the brightness, gamma, and contrast of individual detail elements of the image according to predetermined smoothing factors. A set of smoothing factors is generated by measuring the reflective brightness of detail elements of the projected image to produce a reflective brightness contour map and mathematically inverting the contour map to produce an inverse map. The inverse map is used as smoothing factors to match the colors output by various projectors in an arrayed projection system. The three dimensional smoothing factors lookup table also enables performance of additional image improvement functions, including projector shading, color shift correction, correction of optical vignetting, and automatic edge definition.

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