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 maskInfo
- 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
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.
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) |
-
1991
- 1991-12-03 CA CA002231818A patent/CA2231818C/en not_active Expired - Fee Related
- 1991-12-03 CA CA002231816A patent/CA2231816C/en not_active Expired - Fee Related
- 1991-12-03 CA CA002231820A patent/CA2231820C/en not_active Expired - Fee Related
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |