EP1077445B1
Expired / Lapsed
EP
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Device dependent rendering of characters
Assignee: Adobe Inc
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Filing: 2000-08-14
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Granted: 2006-10-18
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Expires: 2020-08-14
Abstract
No abstract record available.
Inventors
- 👤 Terence S. Dowling
- 👤 Jeremy A. Hall
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:28
CPC Classifications
G; G06; G06T; G06T11/00; G06T11/20; G06T11/23; G06K; G06K15/00; G06K15/02; G09; G09G; G09G5/00; G09G5/22; G09G5/24; G09G5/28; G06K2215/00; G06K2215/0002; G06K2215/004; G06K2215/0042; G09G2340/00; G09G2340/04; G09G2340/0457
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A computer-implemented method of processing a character for display on a raster output device where the output device has a resolution and a set of pixels defining a device grid (392), the method comprising: rendering the character at a resolution higher than the resolution of the output device including aligning a stem of the character; and down sampling the rendered character to the resolution of the output device, characterized in that the method also comprises the steps of providing a plurality of alignment grids (380, 386, 389), each alignment grid being similar to the device grid but shifted by a distance equal to a sub-pixel (394) dimension, evaluating the plurality of alignment grids and selecting a best alignment grid for the stem of the character; and in that the stem of the character is aligned using the selected alignment grid to a sub-pixel boundary
Claim 2
Dependent Claim
64 words
The method of claim 1, wherein the step of rendering includes rendering the character at a type size using a font having font metrics including hinting information defining a center of a stem and where the step of evaluating includes translating the stem onto each alignment grid and determining an alignment grid that best aligns the center of the stem to a sub-pixel boundary.
Claim 3
Dependent Claim
62 words
The method of claim 1, further including receiving sub-pixel geometry information for the output device defining a geometry of the addressable sub-pixels for each pixel of the output device; and where the step of aligning the stem includes using the sub-pixel geometry information to determine which sub-pixels of which pixels to illuminate when the stem is not aligned to a pixel boundary.
Claim 4
Dependent Claim
71 words
The method of claim 1, wherein the step of down sampling includes receiving device specific data derived specifically for the output device where the device specific data includes a plurality of functions, one for each color plane used by the output device; and determining an intensity for each sub-pixel of a pixel in the selected alignment grid using the device specific data to derive intensity data specifically for the output device.
Claim 5
Dependent Claim
13 words
The method of claim 1 where the sub-pixel dimension is a sub-pixel width.
Claim 6
Dependent Claim
13 words
The method of claim 1 where the sub-pixel dimension is a sub-pixel height.
Claim 7
Dependent Claim
15 words
The method of claim 1 where the sub-pixel dimension is a sub-pixel height and width.
References Cited (Backward Citations)
No citation records indexed.
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