Patent EP0427147A2 successfully refreshed from Google Patents.
EP0427147A2
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EP
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Graphics system
Assignee: Honeywell Inc
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Filing: 1990-11-02
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Granted: —
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Expires: 2010-11-02
Abstract
Abstract An improved graphics system having a beamformer (23) operating on data coming from a modified image memory (21a) and graphics processor (20a) producing correctly anti-aliased data to be shown on raster displays (22) and in particular on color mosaic displays.
Inventors
- 👤 William R. Hancock
- 👤 Brent H. Larson
- 👤 Michael J. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 13:07
CPC Classifications
G; G09; G09F; G09F9/00; G09G; G09G5/00; G09G5/22; G09G5/24; G09G5/28; G09G5/36; G09G5/39; G09G5/395; G09G5/399
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
Graphics system implementing an anti-aliasing filter to improve the image quality of raster displays, characterized by: a modified graphics generator (20a), said graphics generator having an output means which provides not only standard integer x and y address data (50) with which to address an image memory, the modified graphics generator output means also provides sub-pixel or fractional address data (51); a modified image memory (21a) including storage for the integer and sub-pixel or fractional address data provided by said graphics generator (20a), said image memory having an input connected to receive the integer and sub-pixel address data from said graphics generator output means, said image memory having an output means providing a sub-pixel output; and a beamformer (23) having input means connected on the output side of said image memory (21a) and having output means connected to an input of the raster display (22), said beamformer receiving impulse data from said image memory and expanding said data into a point spread function (that is, into a gaussian profile) before transmission to said display, whereby the sub-pixel data received is used to adjust a centroid of luminance of the spread point function.
Claim 2
Dependent Claim
192 words
Graphics system implementing an anti-aliasing filter to improve the image quality of raster displays, characterized by: a modified graphics generator (20a), said graphics generator having an output means which provides not only standard integer x and y address data (50) with which to address an image memory, the modified graphics generator output means also provides sub-pixel or fractional address data (51); a modified image memory (21a) including storage for the integer and sub-pixel or fractional address data provided by said graphics generator (20a), said image memory having an input connected to receive the integer and sub-pixel address data from said graphics generator output means, said image memory having an output means providing a sub-pixel output; and a beamformer (23) having input means connected on the output side of said image memory (21a) and having output means connected to an input of the raster display (22), said beamformer receiving impulse data from said image memory and expanding said data into a point spread function (that is, into a gaussian profile) before transmission to said display, whereby the sub-pixel data received is used to adjust a centroid of luminance of the spread point function.
Claim 3
Dependent Claim
18 words
System according to claim 1, characterized in that said raster display is a monochrome or color mosaic display.
Claim 4
Dependent Claim
24 words
System according to claim 2, characterized in that said beamformer further includes a color encoding scheme matching the color pixel pattern of the display.
Claim 5
Dependent Claim
18 words
System according to claim 2, characterized in that the display is a liquid crystal flat panel color display.
Claim 6
Dependent Claim
31 words
System according to claim 1, characterized in that the beamformer is a two-dimensional image filter that adjusts the centroid of light energy and also bandlimits the image for purposes of anti-aliasing.
Claim 7
Dependent Claim
44 words
System according to claim 1, characterized in that the modified graphics generator is in the form of a vector generator which draws lines and figures by incrementally calculating addresses of pixels and then commands a write operation to each of these pixels (Fig. 31).
Claim 8
Dependent Claim
88 words
System according to claim 6, characterized in that the vector generator used with the beamformer includes an accumulator with sufficient precision to handle fractions, into which accumulator a starting point address is first loaded, said vector generator including a truncating circuit and a fraction stripping block which strips out the fractional portion of the pixel address; said vector generator thereby taking advantage of fractional information available from the accumulator and storing the sub-pixel data inside each pixel so that each pixel can be positioned very precisely (Fig. 32).
References Cited (Backward Citations)
No citation records indexed.
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