US6411278B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coordinated position control system, coordinate position control method, and computer-readable storage medium containing a computer program for coordinate position controlling recorded thereon
Assignee: Mitsubishi Electric Corp
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Filing: 1999-07-02
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Granted: 2002-06-25
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Expires: 2019-07-02
Abstract
Abstract When an operator operates a pointing device, a direction computing section computes a movement vector from an image photographed by an image sensor, and when the movement vector is larger than a threshold, a direction correcting section determines the movement vector as invalid based on the recognition that the movement vector was caused by an abrupt change in the illumination or other conditions, and outputs only movement vectors that are smaller than the threshold to a coordinate position updating section.
Inventors
- 👤 Hiroshi Kage
- 👤 Eiichi Funatsu
- 👤 Tetsuji Aoyagi
- 👤 Hajime Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:23
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/0304
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A coordinate position control system comprising: a coordinate position instructing device having an image capturing section; and a coordinate position control device for controlling an instructed coordinate position responding to operation of said coordinate position instructing device and having a computing unit for computing size of a movement vector from successive images photographed by said image capturing section; a determining unit for determining that a movement vector is invalid when the size of the movement vector computed by said computing unit is smaller than a size threshold; and an updating unit for updating an instructed coordinate position responding to operation of said coordinate position instructing device according to a movement vector determined as valid by said determining unit.
Claim 2
Dependent Claim
118 words
A coordinate position control system comprising: a coordinate position instructing device having an image capturing section; and a coordinate position control device for controlling an instructed coordinate position responding to operation of said coordinate position instructing device and having a computing unit for computing size of a movement vector from successive images photographed by said image capturing section; a determining unit for determining that a movement vector is invalid when the size of the movement vector computed by said computing unit is smaller than a size threshold; and an updating unit for updating an instructed coordinate position responding to operation of said coordinate position instructing device according to a movement vector determined as valid by said determining unit.
Claim 3
Dependent Claim
46 words
The coordinate position control system according to claim 1 wherein said determining unit computes an accumulated vector by successively adding the movement vectors that are smaller than the size threshold, and determines that the accumulated vector is valid when the accumulated vector exceeds an accumulation threshold.
Claim 4
Dependent Claim
31 words
The coordinate position control system according to claim 2 wherein said determining unit attenuates the accumulated vector in response to passage of a period of time according to an attenuation coefficient.
Claim 5
Dependent Claim
57 words
The coordinate position control system according to claim 1 wherein said computing unit computes an angle between a movement vector and a movement vector previously determined as valid, and said determining unit compares the angle with a threshold angle and determines that the movement vector is not valid when the angle is not within an angular range.
Claim 6
Independent Claim
112 words
A method of controlling an instructed coordinate position in response to operation of a coordinate position instructing device according to a movement vector obtained from successively images photographed with an image capturing section in the coordinate position instructing device, the method comprising: computing size of a movement vector from successive images photographed with the image capturing section; comparing the size of the movement vector with a size threshold and determining that the movement vector is invalid when the size of the movement vector is smaller than the size threshold; and updating an instructed coordinate position responding to operation of the coordinate position instructing device according to a movement vector determined as valid.
Claim 7
Independent Claim
112 words
A method of controlling an instructed coordinate position in response to operation of a coordinate position instructing device according to a movement vector obtained from successively images photographed with an image capturing section in the coordinate position instructing device, the method comprising: computing size of a movement vector from successive images photographed with the image capturing section; comparing the size of the movement vector with a size threshold and determining that the movement vector is invalid when the size of the movement vector is smaller than the size threshold; and updating an instructed coordinate position responding to operation of the coordinate position instructing device according to a movement vector determined as valid.
Claim 8
Dependent Claim
43 words
The method according to claim 5 including computing an accumulated vector by successively adding the movement vectors that are smaller than the size threshold, and determining the accumulated vector as valid when the size of the accumulated vector exceeds an accumulation threshold value.
Claim 9
Dependent Claim
25 words
The method according to claim 6 including attenuating the accumulated vector in response to passage of a period of time according to an attenuation coefficient.
Claim 10
Dependent Claim
45 words
The method according to claim 5 including computing an angle between a movement vector and a movement vector previously determined as valid, comparing the angle with an angular range, and determining the movement vector as invalid when the angle, is not within the angular range.
References Cited (Backward Citations)
US5515079A
Cited
JPH04241077A
Cited
US5394183A
Cited
US5418862A
Cited
US5835641A
Cited
US5712474A
Cited
US5835078A
Cited
US5528263A
Cited
JPH09134250A
Cited
US5786804A
Cited
US5973672A
Cited
US6144366A
Cited
US6050690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-06-24 | 2005-12-24 | 2006-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-06-24 | 2009-12-24 | 2010-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-06-24 | 2013-12-24 | 2014-06-25 | $7700.00 | Window Closed / Lapsed |