US5745174A
Expired / Lapsed
US
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Viewpoint detection apparatus with selected correction coefficent generation
Assignee: Canon Inc
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Filing: 1995-04-07
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Granted: 1998-04-28
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Expires: 2015-04-07
Abstract
Abstract A viewpoint detection apparatus includes a viewpoint detection unit for detecting the viewpoint of an operator on a display screen, a correction circuit for detecting and correcting any deviation between the actual viewpoint position of the operator and the viewpoint position detected by the viewpoint detection unit, and a storage circuit for storing correction information which is generated by the correction circuit and used for correcting the deviation. The apparatus has a mode of correcting the deviation based on the correction information stored in the storage circuit, and a mode of correcting the deviation by a calculation in the correction circuit without using the correction information.
Inventors
- 👤 Hirofumi Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:00
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02; H; H04; H04N; H04N23/00; H04N23/60; H04N23/63; H04N23/633; H04N23/635; G03B2213/00; G03B2213/02; G03B2213/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A viewpoint detection apparatus comprising: viewpoint detection means for detecting a viewpoint position of an observer with respect to a finder screen; detecting means for detecting a deviation between a visual axis direction and a viewpoint direction on the basis of an output from said viewpoint detection means and outputting information corrective of the viewpoint direction of an eye of the observer; first correction means for calculating a correction coefficient corresponding to the deviation; a memory for storing at least the correction coefficient data; second correction means for calculating the correction coefficient using data stored in said memory; and selection means for selecting one of said first correction means for calculating the correction coefficient without using the data stored in said memory and said second correction means for calculating the correction coefficient using the data stored in the memory.
Claim 2
Dependent Claim
139 words
A viewpoint detection apparatus comprising: viewpoint detection means for detecting a viewpoint position of an observer with respect to a finder screen; detecting means for detecting a deviation between a visual axis direction and a viewpoint direction on the basis of an output from said viewpoint detection means and outputting information corrective of the viewpoint direction of an eye of the observer; first correction means for calculating a correction coefficient corresponding to the deviation; a memory for storing at least the correction coefficient data; second correction means for calculating the correction coefficient using data stored in said memory; and selection means for selecting one of said first correction means for calculating the correction coefficient without using the data stored in said memory and said second correction means for calculating the correction coefficient using the data stored in the memory.
Claim 3
Dependent Claim
37 words
An apparatus according to claim 1, further comprising system control means for, when said first correction means for calculating the correction coefficient without using data stored in said memory is selected, erasing data stored in said memory.
Claim 4
Dependent Claim
23 words
An apparatus according to claim 1, wherein said memory stores at least one correction data independent from an eye of a specific observer.
Claim 5
Dependent Claim
34 words
An apparatus according to claim 3, wherein the one correction data independent from the eye of the specific observer is an average value of correction data obtained in advance from a plurality of observers.
Claim 6
Dependent Claim
40 words
An apparatus according to claim 3, wherein the one correction data independent from the eye of the specific observer is correction data obtained from data obtained by statistically processing deviations between viewpoints and visual axes of a plurality of observers.
Claim 7
Dependent Claim
41 words
An apparatus according to claim 1, wherein when an operation for requesting viewpoint detection is performed without executing an operation for calculating the correction coefficient for said second correction means, said second correction means loads the correction data from said memory.
Claim 8
Dependent Claim
21 words
An apparatus of claim 1, wherein said apparatus is adapted to be arranged in an optical device of a video camera.
Claim 9
Dependent Claim
162 words
A viewpoint detection apparatus comprising: viewpoint detection means for detecting a viewpoint position and a corresponding viewpoint direction of an observer with respect to a finder screen, and for outputting a corresponding viewpoint direction detection signal; a memory for storing at least a first set of data for calculating a correction coefficient; correction coefficient generation means for selectively calculating a correction coefficient using one of first correction coefficient generation means and second correction coefficient generation means for outputting a corresponding correction coefficient signal, said first correction coefficient generation means calculating the correction coefficient using the first set of data stored in said memory, and said second correction coefficient generation means calculating the correction coefficient using a second set of data; and correction means for receiving the viewpoint direction detection signal and the correction coefficient signal, said correction means correcting a deviation between the viewpoint direction and a visual axis and for outputting information corresponding to a corrected viewpoint direction of the observer.
Claim 10
Dependent Claim
162 words
A viewpoint detection apparatus comprising: viewpoint detection means for detecting a viewpoint position and a corresponding viewpoint direction of an observer with respect to a finder screen, and for outputting a corresponding viewpoint direction detection signal; a memory for storing at least a first set of data for calculating a correction coefficient; correction coefficient generation means for selectively calculating a correction coefficient using one of first correction coefficient generation means and second correction coefficient generation means for outputting a corresponding correction coefficient signal, said first correction coefficient generation means calculating the correction coefficient using the first set of data stored in said memory, and said second correction coefficient generation means calculating the correction coefficient using a second set of data; and correction means for receiving the viewpoint direction detection signal and the correction coefficient signal, said correction means correcting a deviation between the viewpoint direction and a visual axis and for outputting information corresponding to a corrected viewpoint direction of the observer.
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) | 2001-04-27 | 2001-10-27 | 2002-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-27 | 2005-10-27 | 2006-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-27 | 2009-10-27 | 2010-04-28 | $7700.00 | Window Closed / Lapsed |