WO2004093012B1 - Determining a coverage mask for a pixel - Google Patents

Determining a coverage mask for a pixel

Info

Publication number
WO2004093012B1
WO2004093012B1 PCT/IB2004/001293 IB2004001293W WO2004093012B1 WO 2004093012 B1 WO2004093012 B1 WO 2004093012B1 IB 2004001293 W IB2004001293 W IB 2004001293W WO 2004093012 B1 WO2004093012 B1 WO 2004093012B1
Authority
WO
WIPO (PCT)
Prior art keywords
edge vector
quadrant
original
coverage mask
edge
Prior art date
Application number
PCT/IB2004/001293
Other languages
French (fr)
Other versions
WO2004093012A2 (en
WO2004093012A3 (en
Inventor
Dan Crisu
Sorin Cotofana
Stamatis Vassiliadis
Petri Liuha
Original Assignee
Nokia Corp
Dan Crisu
Sorin Cotofana
Stamatis Vassiliadis
Petri Liuha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Corp, Dan Crisu, Sorin Cotofana, Stamatis Vassiliadis, Petri Liuha filed Critical Nokia Corp
Priority to EP04727070A priority Critical patent/EP1614071A2/en
Publication of WO2004093012A2 publication Critical patent/WO2004093012A2/en
Publication of WO2004093012A3 publication Critical patent/WO2004093012A3/en
Publication of WO2004093012B1 publication Critical patent/WO2004093012B1/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/20—Drawing from basic elements, e.g. lines or circles
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/40—Filling a planar surface by adding surface attributes, e.g. colour or texture
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/20—Drawing from basic elements, e.g. lines or circles
    • G06T11/203—Drawing of straight lines or curves
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2200/00—Indexing scheme for image data processing or generation, in general
    • G06T2200/12—Indexing scheme for image data processing or generation, in general involving antialiasing

Abstract

The invention relates to a method, a device, a system and a software program product for determining for a pixel a coverage mask reflecting an orientation and possibly a distance from the pixel center of an original edge vector. The pixel is to be employed for displaying at least a part of a geometric primitive on a display, and the original edge vector represents an oriented edge of the geometric primitive. In order to reduce the required storage space for coverage masks, it is proposed that the method comprises as a first step determining one of four quadrants of a Cartesian coordinate system to which the original edge vector belongs due to its orientation. The original edge vector is then transposed into a predetermined one of the four quadrants. Next, a stored coverage mask is fetched, which is associated at least indirectly to the transposed edge vector. Finally, the fetched coverage mask is transformed to the quadrant to which the original edge vector belongs.

Claims

AMENDED CLAIMS
[received by the International Bureau on 10 February 2005 (10.02.05); original claims 1-19 replaced by amended claims 1-18 (9 pages)]
What is claimed is:
A method for determining for a pixel a coverage mask reflecting an orientation of an original edge vector, which pixel is to be employed for displaying at least a part of a geometric primitive on a display, wherein said original edge vector represents an oriented edge of said geometric primitive, and wherein representative edge vectors having different, predetermined orientations are defined, said predetermined orientations for said representative edge vectors being selected such that said representative edge vectors are distributed uniformly over an angle-related space to said four quadrants, said method comprising: a) determining one of four quadrants of a Cartesian coordinate system to which said original edge vector belongs due to its orientation; b) transposing said original edge vector into a predetermined one of said four quadrants; c) selecting one of said representative edge vectors in said predetermined quadrant, which representative edge vector has a similar orientation as said transposed edge vector; d) fetching a stored coverage mask which is associated to said selected representative edge vector and thereby indirectly to said transposed edge vector ; and e) transforming said fetched coverage mask to said quadrant to which said original edge vector belongs . A method according to claim 1, further comprising determining a distance between said original edge vector and a center of said pixel, wherein each stored coverage mask is associated to a combination of an edge vector of a specific orientation and of a specific distance to the center of a respective pixel, and wherein in step d) a stored coverage mask is fetched which is associated indirectly to said transposed edge vector and to said distance determined for said original edge vector.
A method according to claim 2, wherein an original edge vector is defined by parameters characterizing said original edge vector, a first parameter dLi (M) identifying the distance of said edge vector from a center M of said pixel, a second parameter dex ( ) representing the distance in x-direction between a source point of said edge vector and a sink point of said edge vector, and a third parameter dey ( ) representing the distance in y-direction between said source point of said edge vector and said sink point of said edge vector, wherein said quadrant to which said original edge vector belongs is determined based on the signs of said second and said third parameter and wherein said original edge vector is transposed to said predetermined quadrant by adapting the values of said first parameter and of one of said second and said third parameter.
A method according to claim 3 , wherein said predetermined quadrant is the first quadrant of said Cartesian coordinate system, and wherein transposing an original edge vector into said first quadrant is performed, in case an original edge vector belongs to said first quadrant, by keeping the original values of said first parameter dL1 ( ) and of said second parameter dex ( a ) ; in case an original edge vector belongs to said second quadrant, by assigning to said second parameter dex ( ) the inverted original value of said third parameter dey(or) and by keeping the original value of said first parameter dLi (M) ; in case an original edge vector belongs to said third quadrant, by assigning to said first parameter dex ( a ) the inverted original value of said first parameter dex(βf) and by assigning to said first parameter dLι (M) the inverted original value of said first parameter dLι (M) ; in case an original edge vector belongs to said fourth quadrant, by assigning to said first parameter dex ( ) the original value of said second parameter dey ( ) and by assigning to said first parameter dLι (M) the inverted original value of said first parameter dL1 (M) .
A method according to claim 1, wherein said predetermined quadrant is the first quadrant of said Cartesian coordinate system, wherein each stored coverage mask comprises a sequence of bits representing values for subpixels of a grid of subpixels covering an area which is represented by said pixel on a display, and wherein transforming said fetched coverage mask to said quadrant to which said original edge vector belongs is performed, in case an original edge vector belongs to said first quadrant, by keeping said fetched coverage mask; in case an original edge vector belongs to said second quadrant, by rotating said fetched coverage mask counterclockwise by 90°; in case an original edge vector belongs to said third quadrant, by negating bitwise each bit of said fetched coverage mask; in case an original edge vector belongs to said fourth quadrant, by rotating said fetched coverage mask counterclockwise by 90° and by negating bitwise each bit of said rotated coverage mask.
A method according to claim 1, further comprising determining a coverage mask for each edge of said geometric primitive and combining said transformed coverage masks to a single coverage mask for said pixel, said combined coverage mask representing the extend of coverage of said pixel by said geometric primitive .
A method according to claim 1, wherein said representative edge vectors are distributed by said predetermined orientations in a rotationally symmetric manner to said four quadrants of said Cartesian coordinate system, such that if the set of representative edge vectors defined for one quadrant is rotated in steps of 90°, the resulting edge vectors correspond exactly to the set of representative edge vectors defined for another quadrant .
A method according to claim 7, wherein a first representative edge vector of said predetermined quadrant lies on a first border to a first neighboring quadrant of said predetermined quadrant, wherein a representative edge vector lying on a second border to a second neighboring quadrant of said predetermined quadrant constitutes a first representative edge vector of said second neighboring quadrant, wherein in case said transposed edge vector has a similar orientation as said first representative edge vector of said second neighboring quadrant, said method comprises as an exceptional step c) selecting said first representative edge vectors of said predetermined quadrant as representative edge vector, wherein step d) comprises fetching a stored coverage mask which is associated to said selected representative edge vector, and as an exceptional additional step after step d) correcting said fetched coverage mask.
9. A method according to claim 1, wherein the orientation of the edges of said geometric primitive is selected to be one of clockwise and counterclockwise, wherein dedicated coverage masks are stored only for one of said clockwise and said counter-clockwise orientation, and wherein a fetched coverage mask is corrected in case a geometric primitive has an orientation for which no dedicated coverage masks are stored.
10. A device determining for a pixel a coverage mask reflecting an orientation of an original edge vector, which pixel is to be employed for displaying at least a part of a geometric primitive on a display, wherein said original edge vector represents an oriented edge of said geometric primitive, and wherein representative edge vectors having different, predetermined orientations are defined, said predetermined orientations for said representative edge vectors being selected such that said representative edge vectors are distributed uniformly over an angle-related space to four quadrants of a Cartesian coordinate system, said device comprising: a computing portion for determining one of four quadrants of said Cartesian coordinate system to which an original edge vector belongs due to its orientation; a quadrant disambiguation portion for transposing an original edge vector into a predetermined one of said four quadrants; an edge vector disambiguation portion for selecting one of said representative edge vectors in said predetermined quadrant, which representative edge vector has a similar orientation as a transposed edge vector provided by said transposing portion; a coverage mask look-up portion for fetching a stored coverage mask, which coverage mask is associated to a representative edge vector selected by said edge vector disambiguation portion and thereby indirectly to a transposed edge vector provided by said transposing portion; and a transformation portion for transforming a coverage mask provided by said coverage mask look-up portion to a quadrant determined by said computing portion.
11. A device according to claim 10, further comprising a storage unit for storing a plurality of coverage masks, said coverage mask look-up portion having access to said storage unit for fetching a coverage mask, which coverage mask is associated indirectly to a transposed edge vector provided by said transposing portion.
12. A device according to claim 10, further comprising a combining portion for combining a plurality of transformed coverage masks provided by said transformation portion for a specific pixel and for modifying a color of said pixel for display based on said combined coverage mask.
13. A device according to claim 12, further comprising a display for displaying pixels of which a color was modified by said combining unit.
14. A device comprising according to claim 10, wherein said device is a mobile terminal.
15. A device comprising according to claim 10, wherein said device is a computer.
16. A device comprising according to claim 10, wherein said device is a chip.
17. A graphic presentation system determining for a pixel a coverage mask reflecting an orientation of an original edge vector, which pixel is to be employed for displaying at least a part of a geometric primitive on a display, wherein said original edge vector represents an oriented edge of said geometric primitive, and wherein representative edge vectors having different, predetermined orientations are defined, said predetermined orientations for said representative edge vectors being selected such that said representative edge vectors are distributed uniformly over an angle-related space to four quadrants of a Cartesian coordinate system, said graphic presentation system comprising said display device and a processing device, said processing device including: a computing portion for determining one of four quadrants of said Cartesian coordinate system to which an original edge vector belongs due to its orientation; a quadrant disambiguation portion for transposing an original edge vector into a predetermined one of said four quadrants; an edge vector disambiguation portion for selecting one of said representative edge vectors in said predetermined quadrant, which representative edge vector has a similar orientation as a transposed edge vector provided by said transposing portion; a coverage mask look-up portion for fetching a stored coverage mask, which coverage mask is associated to a representative edge vector selected by said edge vector disambiguation portion and thereby indirectly to a transposed edge vector provided by said transposing portion; a transformation portion for transforming a coverage mask provided by said coverage mask look-up portion to a quadrant determined by said computing portion; and a combining portion for combining transformed coverage masks provided by said transformation portion for a specific pixel and for modifying the color of said pixel for display by said display device based on combined coverage mask.
8. A software program product with a program code for determining for a pixel a coverage mask reflecting an orientation of an original edge vector, which pixel is to be employed for displaying at least a part of a geometric primitive on a display, wherein said original edge vector represents an oriented edge of said geometric primitive, and wherein representative edge vectors having different, predetermined orientations are defined, said predetermined orientations for said representative edge vectors being selected such that said representative edge vectors are distributed uniformly over an angle- related space to said four quadrants, which program code is stored on a machine readable carrier, for determining one of four quadrants of a Cartesian coordinate system to which an original edge vector belongs due to its orientation; transposing an original edge vector into a predetermined one of said four quadrants; selecting one of said representative edge vectors in said predetermined quadrant, which representative edge vector has a similar orientation as said transposed edge vector; fetching a stored coverage mask which is associated to said selected representative edge vector and thereby indirectly to a transposed edge vector; and transforming said fetched coverage mask to said quadrant to which an original edge vector belongs due to its orientation; wherein said program code is for execution by a signal processing component.
PCT/IB2004/001293 2003-04-15 2004-04-13 Determining a coverage mask for a pixel WO2004093012A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04727070A EP1614071A2 (en) 2003-04-15 2004-04-13 Determining a coverage mask for a pixel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/414,462 2003-04-15
US10/414,462 US7006110B2 (en) 2003-04-15 2003-04-15 Determining a coverage mask for a pixel

Publications (3)

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WO2004093012A2 WO2004093012A2 (en) 2004-10-28
WO2004093012A3 WO2004093012A3 (en) 2005-02-17
WO2004093012B1 true WO2004093012B1 (en) 2005-03-31

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Country Status (5)

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US (1) US7006110B2 (en)
EP (1) EP1614071A2 (en)
KR (1) KR20050121263A (en)
CN (1) CN1774727A (en)
WO (1) WO2004093012A2 (en)

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Also Published As

Publication number Publication date
CN1774727A (en) 2006-05-17
KR20050121263A (en) 2005-12-26
EP1614071A2 (en) 2006-01-11
WO2004093012A2 (en) 2004-10-28
US20040207642A1 (en) 2004-10-21
WO2004093012A3 (en) 2005-02-17
US7006110B2 (en) 2006-02-28

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