US5861916A
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US
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Apparatus for detecting movement using a difference between first and second image signals
Assignee: Canon Inc
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Filing: 1996-09-05
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Granted: 1999-01-19
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Expires: 2016-09-05
Abstract
Abstract A movement detection apparatus comprises a first circuit for detecting a difference signal between first and second image signals, a second circuit for integrating the difference signal detected by the first circuit, a third circuit for detecting respective image signal levels of the first and second image signals when the image signals reach a predetermined level, a fourth circuit for detecting a difference signal of plural detection results given by the third circuit, and a fifth circuit for dividing the second circuit output signal by the fourth circuit output signal to detect a signal corresponding to image movement.
Inventors
- 👤 Masayoshi Sekine
- 👤 Toshiaki Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:18
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/144; H04N5/145
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
122 words
A video camera including: an image sensor for converting an image formed on an image sensing plane to an image signal; a filter for extracting a predetermined frequency signal from said image signal; a first operation circuit for detecting image movement and providing a movement vector, using said predetermined frequency signal output from said filter; a memory for storing a characteristic of a relationship between an actual movement of the image and the movement detected by said first operation circuit; a second operation circuit for correcting the movement vector, provided by the first operation circuit, using the characteristic stored in said memory; and a movement compensation device for compensating image movement on the basis of an output of said second operation circuit.
Claim 2
Dependent Claim
122 words
A video camera including: an image sensor for converting an image formed on an image sensing plane to an image signal; a filter for extracting a predetermined frequency signal from said image signal; a first operation circuit for detecting image movement and providing a movement vector, using said predetermined frequency signal output from said filter; a memory for storing a characteristic of a relationship between an actual movement of the image and the movement detected by said first operation circuit; a second operation circuit for correcting the movement vector, provided by the first operation circuit, using the characteristic stored in said memory; and a movement compensation device for compensating image movement on the basis of an output of said second operation circuit.
Claim 3
Dependent Claim
33 words
A camera according to claim 1, wherein said filter extracts from the image signal a spatial frequency component corresponding to a repeated pattern of an object image whose movement is to be detected.
Claim 4
Dependent Claim
81 words
A camera according to claim 2, wherein said memory stores a characteristic curve representative of a relationship between (i) a movement amount for said spatial frequency component, and (ii) a movement amount detected by said first operation circuit, and wherein said second operation circuit corrects a relationship between (i) the movement amount for said spatial frequency component and (ii) the movement amount detected by said first operation circuit by using information stored in said memory to obtain a linear relationship therebetween.
Claim 5
Dependent Claim
29 words
A camera according to claim 1, wherein said first operation circuit generates the movement vector from the image signal based on a temporal change of features of the image.
Claim 6
Dependent Claim
77 words
A camera according to claim 1, wherein said movement compensation device includes (i) an image memory for storing an image signal of at least picture, and (ii) a memory control circuit for controlling a read-out position of said image memory, and wherein said movement compensation device controls said memory control circuit to correct movement of the image by shifting a read-out position of said image memory toward a direction in which movement of the image is cancelled.
Claim 7
Dependent Claim
63 words
A camera according to claim 1, wherein said movement compensation device includes an optical movement correction system which shifts an input image optically, and wherein said movement compensation device corrects the movement of the image by moving said optical movement correction system according to an output of said second operation circuit toward a direction in which the movement of the image is cancelled.
Claim 8
Dependent Claim
113 words
A movement compensating apparatus comprising: receiving means for receiving an image signal; filter means for extracting a predetermined frequency signal from the image signal; vector detecting means for detecting a movement of the image and providing a movement vector, using said predetermined frequency signal output from said filter; memory means for storing a characteristic of a relationship between an actual movement of the image and the movement detected by said vector detecting means; operation means for correcting the movement vector provided by the vector detecting means, using the characteristic stored in the memory means; and a movement compensation device for compensating image movement on the basis of an output of said operation means.
Claim 9
Dependent Claim
113 words
A movement compensating apparatus comprising: receiving means for receiving an image signal; filter means for extracting a predetermined frequency signal from the image signal; vector detecting means for detecting a movement of the image and providing a movement vector, using said predetermined frequency signal output from said filter; memory means for storing a characteristic of a relationship between an actual movement of the image and the movement detected by said vector detecting means; operation means for correcting the movement vector provided by the vector detecting means, using the characteristic stored in the memory means; and a movement compensation device for compensating image movement on the basis of an output of said operation means.
Claim 10
Dependent Claim
39 words
Apparatus according to claim 7, wherein said filter means comprises a two-dimensional bandpass filter for extracting from the image signal a spatial frequency component corresponding to a repeated pattern of an object image whose movement is to be detected.
Claim 11
Dependent Claim
27 words
Apparatus according to claim 7, wherein said vector detecting means generates the movement vector from the image signal based on temporal change of features of the image.
Claim 12
Dependent Claim
37 words
Apparatus according to claim 9, wherein said vector detecting means detects from the image signal an edge portion of a luminance signal and provides the movement vector based on the temporal change of the detected edge portion.
Claim 13
Dependent Claim
87 words
Apparatus according to claim 9, wherein said memory means stores a characteristic curve representative of a relationship between (i) a movement amount of said spatial frequency signal, and (ii) a movement amount of the image detected by said vector detecting means, and wherein said operation means corrects a relationship between (i) the movement amount of said spatial frequency signal, and (ii) the movement amount of the image detected by said vector detecting means, by using information stored in said memory means to obtain a linear relationship therebetween.
Claim 14
Dependent Claim
86 words
Apparatus according to claim 7, wherein said movement compensation device includes (i) an image memory for storing an image signal of at least one picture, and (ii) a memory control circuit for controlling a read-out position of said image memory, and wherein said movement compensation device controls said memory control circuit to correct movement of the image by shifting a read-out position of said image memory according to an output of said operation means toward a direction in which the movement of the image is cancelled.
Claim 15
Dependent Claim
63 words
Apparatus according to claim 7, wherein said movement compensation devices includes an optical movement correction system for optically shifting an input image, and wherein said movement compensation device corrects the movement of the image by moving said optical movement correction system according to an output of said operation means toward a direction in which the movement of the image is to be cancelled.
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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) | 2002-01-18 | 2002-07-20 | 2003-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-18 | 2006-07-20 | 2007-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-18 | 2010-07-20 | 2011-01-19 | $7700.00 | Window Closed / Lapsed |