US4817178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear cursor representation method
Assignee: Hitachi Ltd
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Filing: 1986-04-15
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Granted: 1989-03-28
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Expires: 2006-04-15
Abstract
Abstract To measure a line width of a linear portion of a digital image maintaining a precision finer than a picture element, a digital linear cursor pattern represented by digital picture elements is generated, the pattern is inclined with respect to the horizontal direction by an angle which maximizes the measuring precision, and the pattern is fitted to a linear portion to be measured, to thereby measure the width of a line.
Inventors
- 👤 Kaoru Momose
- 👤 Makoto Kato
- 👤 Tetsuo Yokoyama
- 👤 Toshihiro Furuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:20
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/08; G06; G06F; G06F3/00; G06F3/01; G06F3/048; G06F3/0481; G06F3/04812; G06T; G06T7/00; G06T7/60; G06T2207/00; G06T2207/30; G06T2207/30108; G06T2207/30148
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A method of measuring with high precision a linear portion of a digital image displayed on a display screen using at least one linear cursor, comprising the steps of: rotating said digital image on said display screen to a selected angle which provides a maximum measuring precision; generating on said digital image on said display screen at least one digital cursor pattern using digital picture elements; and positioning said digital cursor pattern at said selected angle by fitting it to said linear portion to be measured on said rotated digital image to effect a measurement thereof.
Claim 2
Independent Claim
96 words
A method of measuring with high precision a linear portion of a digital image displayed on a display screen using at least one linear cursor, comprising the steps of: rotating said digital image on said display screen to a selected angle which provides a maximum measuring precision; generating on said digital image on said display screen at least one digital cursor pattern using digital picture elements; and positioning said digital cursor pattern at said selected angle by fitting it to said linear portion to be measured on said rotated digital image to effect a measurement thereof.
Claim 3
Dependent Claim
56 words
The method of claim 1, wherein said positioning of said digital cursor pattern includes rotating said cursor pattern to said selected angle, moving said rotated cursor pattern between boundary points of the linear postion to be measured, and determining the dimension of said linear portion on the basis of the movement of said rotated cursor pattern.
Claim 4
Dependent Claim
35 words
The method of claim 1, wherein said cursor pattern is generated by illuminating all picture element intersected by a true straight line at the position on said display screen where said cursor is to appear.
Claim 5
Dependent Claim
67 words
The method of claim 1, wherein said generating step includes generating a pair of digital cursor patterns, and said positioning step includes rotating said cursor patterns to said selected angle, moving said rotated cursor patterns to respective boundary points of said linear portion to be measured, and determining the dimension of said linear portion of the basis of the relative difference in position of said cursor patterns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |