US 2002/0158877 A1 · Shadow buffer control module method and software construct for adjusting per pixel raster images attributes to screen space and projector features for digital wrap, intensity transforms, color matching, soft-edge blending and filtering for multiple projectors and laser projectors

Abstract

The Shadow Buffer method can be characterized as control of multiple reusable parallel buffers that have utility in mapping digital transformations to improve formation of composite images for single displays or multiple projected images. This method can be described analogously as innovative extensions to current software and hardware solutions that use multiple allocation of pixel memory space to color, alpha and Z-depth functions. The Shadow Buffers are additional pixel and sub-pixel memory maps of screen space and projector attributes (e.g., gamma, contrast, intensity, color, position, stretching, warping, soft-edge blending) that improve the final overall composite image. The improved composite images include but are not limited to: Multiple Projected Images digitally soft-edge blended into a seamless tiled image displays Single or Multiple Projected Images digitally warped into a seamless tiled image for curved screen displays Single or Multiple Projected Images digitally warped for geometric corrections for optical keystone and pin cushion effects. Single or Multiple Images digitally corrected for defects in the projector or monitor display device Single or Multiple Images digitally corrected for defects in the display screen(s) Single or Multiple Images digitally combined or subtracted for sensor fusion, synthetic visions and augmented reality Further, the parallel nature of the Shadow Buffer supports combinations for custom applications. For example up to the memory limitations of a particular device the Shadow Buffers can be utilized to soft-edge blend, digitally warp projected image tiles and simultaneously corrects for defects in the projector and screen. Additional combinations and other extensions are obvious to others familiar with the current state of the art. It is important to emphasize that the Shadow Buffer method is a software construct and method that digitally controls the images within the image generation device and does not require additional custom hardware. Hardware acceleration of the Software Construct and Shadow Buffer Method is possible but not required.

Claims22

Dependent claims

A system for adjusting digitally generated images for single monitors, single projectors and arrays of monitors, and projectors of raster images to form composite blended images from multiple frame buffer inputs comprising:

single or multiples of monitors including CRTs, flat screens, and projectors and their associated displays, to form blended composite images;
a plurality of projectors to display the array of raster images, each raster image including red, green and blue color components, to form a blended composite projected image;
a N dimensional array of shadow buffers, each shadow buffer value being associated with a sub-pixel, pixel, region of each input memory value blended into the entire composite image;
and
means for applying the shadow buffer values to the digital image prior to output as video signals or digital packets to blend multiple digital inputs and frame buffer memory values into a blended composite image, wherein the shadow buffer values comprises alterations and modifications to for each image pixel displayed of the blended composite image for each of red, green, and blue color displayed frame buffer pixel value, and wherein each shadow buffer value is applied to a selected portion of the blended composite image by addition, subtracting, shifting, masking of bits, or colors, scaling, accumulation, logical and bit-wise operations the shadow buffer values with input frame buffer values for the selected portion.

2 more elements

A system for adjusting digitally generated images for single monitors, single projectors and arrays of monitors, and projectors of raster images to compensate for projection and screen defects and or blended images comprising:

single or multiples of monitors including CRTs, flat screens, and projectors and their associated display screens, to form blended or composite images;
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 N dimensional array of shadow buffers, each shadow buffer value being associated with a sub-pixel, pixel, region or the entire composite projected image;
and
means for applying the shadow buffer values to the digital image prior to output as video signals or digital packets to remove the projection and screen defects resulting from display of the array of raster images, wherein the shadow buffer values comprises alterations and modifications to for each image pixel displayed of the composite projected image for each of red, green, and blue color displayed frame buffer pixel value, and wherein each shadow buffer value is applied to a selected portion of the composite projected image by addition, subtracting, shifting, masking of bits, or colors, scaling, accumulation, logical and bit-wise operations the shadow buffer values with displayed frame buffer values for the selected portion.

2 more elements

A system for adjusting video signals representing an array of raster images to compensate for projection defects and screen 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;
means for storing N dimensional arrays of shadow buffer values, each shadow buffer value being associated with a portion of the composite projected image;
and
means for applying the shadow buffer values to the digital image prior to output as video signals or digital packets to remove the projection and screen defects resulting from display of the array of raster images, wherein the applying means comprises:
an intensity shadow buffer array comprised of sub-pixel or pixel values that digitally adjusts the associated image pixel values by addition, subtracting, shifting, masking of bits, or colors, scaling, accumulation, logical and bit-wise operations prior to output;
a gamma shadow buffer array comprised of sub-pixel or pixel values that digitally adjusts the associated image pixel values by addition, subtracting, shifting, masking of bits, or colors, scaling, accumulation, logical and bit-wise operations prior to output;
a color space shadow buffer array comprised of sub-pixel or pixel values that digitally adjusts the associated image pixel color values by addition, subtracting, shifting, masking of bits, or colors, scaling, accumulation, logical and bit-wise operations prior to output;
and
a geometry correction shadow buffer array comprised of sub-pixel or pixel values that digitally adjusts the associated image pixel column or raster lengths via a shadow buffer edge mask coupled with a redistributes of the masked pixels values across the remaining displayed pixels.

6 more elements

A method of matching arrayed projectors to produce a composite raster image having consistent green, red, and blue color values, comprising the steps of:

(a) focusing at least one digital camera or light sensor on the display(s) or projection screen(s);
(b) displaying green color values by a selected one of the displays or projectors on the display(s) or projection screen(s);
(c) displaying bars or grayscale patterns, etc. of the green color values by the selected display or projector on the display(s) or projection screen(s);
(d) collecting green performance measurement data from the at least one digital camera or light sensor sensing the display by the selected display(s) or projection screen(s);
(e) displaying red color values by a selected one of the displays or projectors on the display(s) or projection screen(s);
(f) displaying bars or grayscale patterns, etc. of the red color values by the selected display or projector on the display(s) or projection screen(s);
(g) collecting red performance measurement data from the at least one digital camera or light sensor sensing the display by the selected display(s) or projection screen(s);
(h) displaying blue color values by a selected one of the displays or projectors on the display(s) or projection screen(s);
(i) displaying bars or grayscale patterns, etc. of the blue color values by the selected display or projector on the display(s) or projection screen(s);
(j) collecting blue performance measurement data from the at least one digital camera or light sensor sensing the display by the selected display(s) or projection screen(s);
(k) displaying grayscale color values by a selected one of the displays or projectors on the display(s) or projection screen(s);
(l) displaying bars or grayscale patterns, by the selected display or projector on the display(s) or projection screen(s);
(m) collecting grayscale performance measurement data for contrast and dynamic range from the at least one digital camera or light sensor sensing the display by the selected display(s) or projection screen(s);
(n) repeating steps (b)-(m) for each of the display(s) or projection screen(s);
(o) generating a performance profile for each of the display(s) or screen projection and for all projectors combined from the collected measurement data;
(p) adjusting the projectors according to the performance profiles, via digital controls from a shadow buffer control module ( * * * Separate provisional patent application) and
(q) adjusting the associated shadow buffer according to the performance profiles, via digital controls from a shadow buffer control module ( * * * Separate provisional patent application) 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 displayed on single or multiple displays, tiled flat panels, and or projected on a projection screen by one of the arrayed projectors.

14 more elements

Dependencies are inferred from the claim text.

Shadow buffer control module method and software construct for adjusting per pixel raster images attributes to screen space and projector features for digital wrap, intensity transforms, color matching, soft-edge blending and filtering for multiple projectors and laser projectors

Life of this patent

Shadow buffer control module method and software construct for adjusting per pixel raster images attributes to screen space and projector features for digital wrap, intensity transforms, color matching, soft-edge blending and filtering for multiple projectors and laser projectors

Life of this patent

Abstract

Claims22