US5400667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for measuring picture quality
Assignee: Televerket
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Filing: 1991-09-18
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Granted: 1995-03-28
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Expires: 2011-09-18
Abstract
Abstract PCT No. PCT/SE91/00624 Sec. 371 Date Mar. 24, 1993 Sec. 102(e) Date Mar. 24, 1993 PCT Filed Sep. 18, 1991 PCT Pub. No. WO92/05669 PCT Pub. Date Apr. 2, 1992.The invention relates to a way for subjective, graphical measurement of picture sharpness/picture quality. Measuring and assessing picture quality have so far been a time-consuming chore for laboratory engineers having access to expensive and complicated electro-optical measuring equipments. The way described enables an unknown text object to be measured with respect to objective and subjective picture quality using for example a series of previously measured paper pictures in a simple and reliable way.
Inventors
- 👤 Yingduo Feng
- 👤 Olov stberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:56
CPC Classifications
H; H04; H04N; H04N17/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A device for measuring picture quality of display media, comprising: a set of test gauges containing pictures/text with varying and physically well-defined picture qualities for direct reading of physical measurement results as well as the corresponding subjective expression of the picture or the text with respect to picture quality wherein said test gauges are produced in a series with a subjective picture quality ranging from very poor to very good.
Claim 2
Independent Claim
70 words
A device for measuring picture quality of display media, comprising: a set of test gauges containing pictures/text with varying and physically well-defined picture qualities for direct reading of physical measurement results as well as the corresponding subjective expression of the picture or the text with respect to picture quality wherein said test gauges are produced in a series with a subjective picture quality ranging from very poor to very good.
Claim 3
Dependent Claim
49 words
A device according to claim 1, wherein said test gauges are selected based upon the field of application of said image and wherein said field is selected from the group of photographical, optical, electro-optical or electronical display media and with photographical, optical, electro-optical or electronical production techniques including screening.
Claim 4
Dependent Claim
23 words
A device according to claim 2, wherein said test gauges are photographically produced prints depicting the picture of the display media under test.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |