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Patent US6690839B1 successfully refreshed from Google Patents.
US6690839B1
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Efficient predictor of subjective video quality rating measures
Assignee: Project Giants LLC
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Filing: 2000-01-17
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Granted: 2004-02-10
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Expires: 2020-01-17
Abstract
Abstract An efficient predictor for subjective video quality rating measures processes a reference video and an impaired video corresponding to the reference video in respective processing channels. Each channel applies a contrast sensitivity function from a human vision system model to the respective videos and a contrast discrimination function for self-masking to the output of the contrast sensitivity function. The outputs from the channels are input to a differencing circuit to obtain absolute difference values. The absolute difference values are modified by a global masking factor derived from the output from the reference video channel, and the resulting values are converted into units conforming to a standard quality rating metric.
Inventors
- 👤 Kevin M. Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:12
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/0002; G06T7/0004; G06T7/001; H; H04; H04N; H04N17/00; G06T2207/00; G06T2207/10; G06T2207/10016; G06T2207/30; G06T2207/30168
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
An apparatus for efficient prediction of subjective video quality rating measures comprising: a pair of processing channels, a first channel for processing a reference video and a second channel for processing an impaired video corresponding to the reference video, the reference and impaired videos being processed directly in the respective channels according to a human vision system model without pyramid decomposition to produce a processed reference video and a processed impaired video; and means for obtaining an absolute difference between the processed reference video and the processed impaired video as a quality rating measure.
Claim 2
Independent Claim
94 words
An apparatus for efficient prediction of subjective video quality rating measures comprising: a pair of processing channels, a first channel for processing a reference video and a second channel for processing an impaired video corresponding to the reference video, the reference and impaired videos being processed directly in the respective channels according to a human vision system model without pyramid decomposition to produce a processed reference video and a processed impaired video; and means for obtaining an absolute difference between the processed reference video and the processed impaired video as a quality rating measure.
Claim 3
Dependent Claim
39 words
The apparatus as recited in claim 1 further comprising means for applying a global masking factor as a function of the processed reference video to the absolute difference, the output of the applying means being the quality rating measure.
Claim 4
Independent Claim
26 words
The apparatus as recited in claims 1 or 2 further comprising means for converting the quality rating measure to units of a standard quality rating measure.
Claim 5
Dependent Claim
70 words
The apparatus as recited in claim 1 wherein each channel comprises: a two-dimensional filter for obtaining a spatial frequency response for an input video, the two-dimensional filter emulating the human vision system model; and a contrast discrimination stage having the spatial frequency response as an input to account for the effects of self-masking, the output from the contrast discrimination stage being a processed video for input to the obtaining means.
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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) | 2007-02-09 | 2007-08-11 | 2008-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-02-09 | 2011-08-11 | 2012-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-02-09 | 2015-08-11 | 2016-02-10 | $7700.00 | Window Closed / Lapsed |