Stroke-to-stroke
AssigneeKaiser Aerospace & Electronics Corporation
InventorsNikhil Balram, William P. Olson, Michael R. Wilson
Life of this patent
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Abstract
A digital address filter is provided which converts straight-line and arc analog stroke data into digitized images which comply with Bresenham raster display criteria and can be displayed on a raster scanned monitor or LCD. Data collected over a preselected (M pixel.times.M pixel) spatial window are repetitively matched against a set of pixel template patterns permitted by the Bresenham criteria. After each full-frame iteration, the display pixel(s) corresponding to the best-fit templates are lighted.
Claims41
A method of converting stroke display data to raster scan display data comprising the following steps:
- writing a selected pixel to a frame buffer;
- locating an extended pixel matrix in a fixed relationship to said selected pixel;
- sampling stroke display data to count occurrences of sample addresses within said extended pixel matrix;
- and
- comparing a pattern of sample address counts against a predetermined set of acceptable address patterns to select a pixel to be a next selected pixel.
A stroke to raster display converter comprising:
- means for converting an analog input data stream to a stream of digital pixel addresses;
- an extended pixel matrix of pixel address counters;
- means for sampling the stroke display data to count occurrences of sample addresses within said extended pixel matrix;
- means for comparing a pattern of sample address counts against a predetermined set of acceptable address patterns to select a subsequent selected pixel;
- raster frame buffer for storing each subsequent selected pixel;
- and
- means for illuminating said subsequent selected pixels in said raster frame buffer.
Dependencies are inferred from the claim text.