US5940124A
Expired / Lapsed
US
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Attentional maps in objective measurement of video quality degradation
Assignee: Tektronix Inc
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Filing: 1997-07-18
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Granted: 1999-08-17
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Expires: 2017-07-18
Abstract
Abstract Attentional maps that reflect the subjective view of an observer to the effects of degradation in a video image are used in the objective measurement of video quality degradation. The observer assists in generating an attentional map for each image of a test image sequence, which provides different thresholds or weighting factors for different areas of each image. A video image sequence from a system under test is compared with the test image sequence, and the error results are displayed as a function of the corresponding attentional maps.
Inventors
- 👤 Bozidar Janko
- 👤 John W. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:54
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/004
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A method of measuring video quality degradation comprising the steps of: generating an attentional map for each image of a test image sequence; capturing a video image sequence corresponding to the test image sequence after it has been processed by a system under test; and comparing the test image sequence with the video image sequence with the results being weighted in accordance with the corresponding attentional maps to provide a measurement display.
Claim 2
Independent Claim
72 words
A method of measuring video quality degradation comprising the steps of: generating an attentional map for each image of a test image sequence; capturing a video image sequence corresponding to the test image sequence after it has been processed by a system under test; and comparing the test image sequence with the video image sequence with the results being weighted in accordance with the corresponding attentional maps to provide a measurement display.
Claim 3
Dependent Claim
53 words
The method as recited in claim 1 further comprising the steps of: initially selecting a measurement type from among a set of measurements that determines the results to be displayed as part of the measurement display; and preprocessing the video image sequence according to the selected measurement type prior to the comparing step.
Claim 4
Dependent Claim
61 words
The method as recited in claim 2 wherein the preprocessing step comprises the steps of: performing specified measurements on the video image sequence to obtain measurement values according to the selected measurement type; testing the measurement values against limits to determine whether an out of limits situation is present; and providing a warning if the out of limits situation is present.
Claim 5
Dependent Claim
65 words
The method as recited in claim 2 wherein the capturing step comprises the steps of: converting the video image sequence to serial digital if input in a composite format; searching for a test sequence trigger within the video image sequence; verifying that the test sequence trigger corresponds to the selected measurement type; and storing a frame of the video image sequence in a storage device.
Claim 6
Dependent Claim
58 words
The method as recited in claim 4 wherein the comparing step comprises the steps of: retrieving the captured frame from the storage device; checking to see whether a comparable reference frame is available; and performing the measurement type using the captured frame and the comparable reference frame together with the corresponding attentional map to provide the measurement display.
Claim 7
Dependent Claim
78 words
An instrument for measuring video quality degradation comprising: means for storing an attentional map for each image of a test image sequence; means for capturing a video image sequence corresponding to the test image sequence after the test image sequence has been processed by a system under test; and means for comparing the test image sequence with the video image sequence with the results being weighted in accordance with the corresponding attentional maps to provide a measurement display.
Claim 8
Dependent Claim
78 words
An instrument for measuring video quality degradation comprising: means for storing an attentional map for each image of a test image sequence; means for capturing a video image sequence corresponding to the test image sequence after the test image sequence has been processed by a system under test; and means for comparing the test image sequence with the video image sequence with the results being weighted in accordance with the corresponding attentional maps to provide a measurement display.
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) | 2002-08-16 | 2003-02-15 | 2003-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-16 | 2007-02-15 | 2007-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-16 | 2011-02-15 | 2011-08-17 | $7700.00 | Window Closed / Lapsed |