Patent EP1077445A2 successfully refreshed from Google Patents.
EP1077445A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Device dependent rendering of characters
Assignee: Adobe Inc
•
Filing: 2000-08-14
•
Granted: —
•
Expires: 2020-08-14
Abstract
Abstract A method for creating anti-aliased characters on a computer output device includes the steps of generating a call from a client process for a character to be rendered, selecting a best alignment grid from a set of alignment grids associated with the device grid, rendering the character at a high resolution, and aligning stems of the character with an alignment grid corresponding to the resolution of an output device. The step of aligning the high resolution rendered stems to the alignment grid provides for an anti-aliased output with balanced stems.
Inventors
- 👤 Terence S. Dowling
- 👤 Jeremy A. Hall
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:48
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: 8
Claim 1
Independent Claim
125 words
A computer-implemented method for 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, the method comprising: evaluating a plurality of alignment grids and selecting a best alignment grid
for a stem of the character where the plurality of alignment grids from a set of grids,
each alignment grid in the set being similar to the device grid but shifted by a phase
difference equal to a sub-pixel dimension; rendering the character at a resolution higher than the resolution of the
output device including aligning the stem using the selected alignment grid to a sub-pixel
boundary; and down sampling the rendered character to the resolution of the output device.
Claim 2
Dependent Claim
57 words
The method of claim 1, wherein the character being created at a type size
by a font having font metrics including hinting information defining a center of a stem
and where the step of evaluating includes laying down the character 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 character includes using the sub-pixel
geometry information to determine which sub-pixels of which pixels to illuminate
when the character 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.
Claim 8
Dependent Claim
66 words
A computer-implemented method for processing a character for display on
a raster output device having an resolution defined by a set of output pixel positions,
the method comprising: aligning a stem of the character to a best sub-pixel boundary; rendering the character at a resolution higher than the resolution of the
raster output device; and down sampling the aligned character to the raster output device resolution.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.