CA2231820A1 - Method and apparatus for halftone rendering of a gray scale image using a blue noise mask - Google Patents

Method and apparatus for halftone rendering of a gray scale image using a blue noise mask

Info

Publication number
CA2231820A1
CA2231820A1 CA002231820A CA2231820A CA2231820A1 CA 2231820 A1 CA2231820 A1 CA 2231820A1 CA 002231820 A CA002231820 A CA 002231820A CA 2231820 A CA2231820 A CA 2231820A CA 2231820 A1 CA2231820 A1 CA 2231820A1
Authority
CA
Canada
Prior art keywords
gray scale
pixel
blue noise
scale image
noise mask
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002231820A
Other languages
French (fr)
Other versions
CA2231820C (en
Inventor
Theophano Mitsa
Kevin J. Parker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Research Corp Technologies Inc
Original Assignee
Research Corporation Technologies, Inc.
Theophano Mitsa
Kevin J. Parker
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
Priority claimed from US07/622,056 external-priority patent/US5111310A/en
Application filed by Research Corporation Technologies, Inc., Theophano Mitsa, Kevin J. Parker filed Critical Research Corporation Technologies, Inc.
Publication of CA2231820A1 publication Critical patent/CA2231820A1/en
Application granted granted Critical
Publication of CA2231820C publication Critical patent/CA2231820C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

A method of and system for rendering a halftone image of a gray scale image (500) by utilizing a pixel-by-pixel comparison (402) of the gray scale image against a blue noise mask (502) is disclosed in which the gray scale image is scanned on a pixel-by-pixel basis and compared on a pixel-by-pixel basis to an array of corresponding data points contained in a blue noise mask stored in a PROM (406) or computer memory in order to produce the desired halftoned image. Both digital and optically implemented halftone methods are disclosed. Application specific modifications of the blue noise mask as well as its use for producing halftoned color images are also disclosed.
CA002231820A 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask Expired - Fee Related CA2231820C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/622,056 US5111310A (en) 1990-12-04 1990-12-04 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask
US622,056 1990-12-04
CA002097508A CA2097508C (en) 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002097508A Division CA2097508C (en) 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask

Publications (2)

Publication Number Publication Date
CA2231820A1 true CA2231820A1 (en) 1992-06-05
CA2231820C CA2231820C (en) 2003-02-04

Family

ID=25676249

Family Applications (3)

Application Number Title Priority Date Filing Date
CA002231818A Expired - Fee Related CA2231818C (en) 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask
CA002231816A Expired - Fee Related CA2231816C (en) 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask
CA002231820A Expired - Fee Related CA2231820C (en) 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask

Family Applications Before (2)

Application Number Title Priority Date Filing Date
CA002231818A Expired - Fee Related CA2231818C (en) 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask
CA002231816A Expired - Fee Related CA2231816C (en) 1990-12-04 1991-12-03 Method and apparatus for halftone rendering of a gray scale image using a blue noise mask

Country Status (1)

Country Link
CA (3) CA2231818C (en)

Also Published As

Publication number Publication date
CA2231820C (en) 2003-02-04
CA2231816A1 (en) 1992-06-05
CA2231818A1 (en) 1992-06-05
CA2231816C (en) 2002-07-30
CA2231818C (en) 2002-09-24

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