Graphics display system with anti-aliased text and graphics feature
First Claim
Patent Images
1. A method of displaying a graphical element comprising:
- filtering the graphical element with a low pass filter to generate a plurality of multi-level values, each of the multi-level values corresponding to a pixel at a display resolution;
removing at least a least significant bit from at least one of the multi-level values prior to using the multi-level values as alpha blend values; and
using the multi-level values as the alpha blend values for the graphical element in a subsequent compositing stage.
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Abstract
A graphics integrated circuit chip is used in a set-top box for controlling a television display. The graphics chip processes analog video input, digital video input, a graphics input and an audio input simultaneously. The system may use anti-aliased text and graphics to provide high quality display of graphical elements, or glyphs, which represent an image of a character of text or graphics, on television and other displays. The graphical elements may be superimposed over live video or arbitrary graphics imagery.
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Citations
20 Claims
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1. A method of displaying a graphical element comprising:
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filtering the graphical element with a low pass filter to generate a plurality of multi-level values, each of the multi-level values corresponding to a pixel at a display resolution; removing at least a least significant bit from at least one of the multi-level values prior to using the multi-level values as alpha blend values; and using the multi-level values as the alpha blend values for the graphical element in a subsequent compositing stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A graphics display system for displaying a graphical element comprising:
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a low pass filter for filtering the graphical element to generate multi-level values, one multi-level value per each pixel, at a display resolution; a memory for storing the multi-level values; and a graphics blender for blending the graphical element with at least one graphics image using the multi-level values as alpha blend values, wherein at least a least significant bit is removed from at least one of the multi-level values prior to using the multi-level values as alpha blend values. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification