Method and apparatus for adjusting multiple projected raster images
First Claim
1. A system for adjusting video signals representing an array of raster images to compensate for projection defects comprising:
- a plurality of projectors to display the array of raster images, each raster image including red, green and blue color components, to form a composite projected image;
a three dimensional array of smoothing factors, each smoothing factor being associated with a portion of the composite projected image; and
means for applying the smoothing factors to the video signals to remove the projection defects resulting from display of the array of raster images, wherein the three dimensional array of smoothing factors comprises a smoothing factor for each portion of the composite projected image for each of red, green, and blue color signals of the video signals, and wherein each smoothing factor is applied to a selected portion of the composite projected image by multiplying the smoothing factor with video signal values for the selected portion.
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Accused Products
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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Citations
28 Claims
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1. A system for adjusting video signals representing an array of raster images to compensate for projection defects comprising:
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a plurality of projectors to display the array of raster images, each raster image including red, green and blue color components, to form a composite projected image; a three dimensional array of smoothing factors, each smoothing factor being associated with a portion of the composite projected image; and means for applying the smoothing factors to the video signals to remove the projection defects resulting from display of the array of raster images, wherein the three dimensional array of smoothing factors comprises a smoothing factor for each portion of the composite projected image for each of red, green, and blue color signals of the video signals, and wherein each smoothing factor is applied to a selected portion of the composite projected image by multiplying the smoothing factor with video signal values for the selected portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for adjusting video signals representing an array of raster images to compensate for projection defects comprising:
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a plurality of projectors to display the array of raster images, each raster image including red, green and blue color components, to form a composite projected image; means for storing a three dimensional array of smoothing factors, each smoothing factor being associated with a portion of the composite projected image; and means for applying the smoothing factors to the video signals to remove the projection defects resulting from display of the array of raster images, wherein the applying means comprises; a brightness circuit to adjust the brightness of the video signals; a mixer coupled to the brightness circuit; and a smoothing factor multiplier coupled to the mixer and the storing means to apply the smoothing factors to video signals used for generating the composite projected image. - View Dependent Claims (12, 13)
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14. A method of matching arrayed projectors to produce a composite raster image having consistent red, green, and blue color values, comprising the steps of:
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(a) focusing at least one light sensor on the projection screen; (b) displaying a selected one of the color values by a selected one of the projectors on the projection screen; (c) displaying a pattern of the selected color value by the selected projector on the projection screen; (d) collecting measurement data from the at least one light sensor sensing the display by the selected projector of the pattern; (e) repeating steps (b)-(d) for each of the color values; (f) repeating steps (b)-(e) for each of the projectors; (g) generating a behavior profile for each of the projectors and for all projectors combined from the collected measurement data; and (h) adjusting the projectors according to the behavior profiles, wherein the composite rater image comprises a plurality of raster images, each of the plurality of raster images includes red, green and blue color components, and each raster image is projected on a projection screen by one of the arrayed projectors. - View Dependent Claims (15, 16, 17)
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18. A system for producing a composite raster image having consistent red, green, and blue color values, the system comprising:
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arrayed projectors to project the composite raster image on a projection screen; at least one light sensor sensing the composite raster image on the projection screen; means for displaying selected color values by selected projectors on the projection screen; means for displaying patterns of selected color values by selected projectors on the projection screen; means for collecting measurement data from the at least one light sensor sensing the display by the selected projector of the patterns; means for generating a behavior profile for each of the projectors and for all projectors combined from the collected measurement data; and means for adjusting the projectors according to the behavior profiles, wherein the composite raster image comprises a plurality of raster images, each of the plurality of raster images includes red, green and blue color components, and the arrayed protectors are matched to provide the consistent red, green, and blue color values to the composite raster image. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification