EP0458373A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image shake detecting device
Assignee: Canon Inc
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Filing: 1989-03-08
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Granted: —
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Expires: 2009-03-08
Abstract
Abstract An image shake detecting device for detecting a shake of an image on an image sensing plane on the basis of a video signal output from an image sensor includes detection circuits arranged to detect image displacement in a plurality of areas set on the image sensing plane, and a control microcomputer which makes a discrimination, on the basis of information output from these detection circuits, between a movement of a camera and a solo movement of a photographed object. The device thus accurately makes compensation for an image shake by judging the state of the image on the basis of information output from these detection circuits. The image shake detecting device further includes a computing circuit arranged to compute a quantity of an image shake on the basis of a difference in detecting timing of a feature point of the image and a sensitivity control circuit arranged to change the detection sensitivity of the shake detection circuits. Further disclosed is an object tracing device to which the invented image shake detecting device is applied.
Inventors
- 👤 Masayoshi Sekine
- 👤 Toshiyuki Nakajima
- 👤 Takashi Kai
- 👤 Katsuji Yoshimura
- 👤 Masamichi Toyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 10:23
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/78; G01S3/782; G01S3/785; G01S3/786; G01S3/7864; G06; G06T; G06T7/00; G06T7/20; G06T7/223; H; H04; H04N; H04N23/00; H04N23/60; H04N23/61; H04N23/67; H04N23/673; H04N23/68; H04N23/681; H04N23/6811; H04N23/6815; H04N23/682; H04N23/685; H04N23/686; H04N23/687; H04N5/00; H04N5/14; H04N5/144; H04N5/145; G03; G03B; G03B2217/00; G03B2217/005; G06T2207/00; G06T2207/10; G06T2207/10016
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
104 words
An image shake detecting device for detecting a shake of an image on an image sensing plane on the basis of an image signal output from image sensing means, being characterized by comprising: a) extracting means for extracting a feature point from within said image sensing plane; b) detection means for detecting a difference in generation timing of said feature point between a plurality of temporally different images; c) computing means for computing a quantity of the shake of the image on the basis of an output of said detection means; and d) sensitivity control means for varying a sensitivity of said detection means.
Claim 2
Dependent Claim
104 words
An image shake detecting device for detecting a shake of an image on an image sensing plane on the basis of an image signal output from image sensing means, being characterized by comprising: a) extracting means for extracting a feature point from within said image sensing plane; b) detection means for detecting a difference in generation timing of said feature point between a plurality of temporally different images; c) computing means for computing a quantity of the shake of the image on the basis of an output of said detection means; and d) sensitivity control means for varying a sensitivity of said detection means.
Claim 3
Dependent Claim
34 words
A device according to claim 1, being characterized by further comprising compensating means for compensating the shake of the image on the basis of a result of a computing operation of said computing means.
Claim 4
Dependent Claim
38 words
A device according to claim 2, being characterized in that said compensating means is a variable apex-angle prism for compensating an optical axis of a photo-taking optical system which forms an object image on said image sensing means.
Claim 5
Dependent Claim
48 words
A device according to claim 1, being characterized in that said extracting means is arranged to extract a feature point from a signal pattern obtained by converting into a binary value an edge component of a luminance component of the image signal output from said image sensing means.
Claim 6
Dependent Claim
48 words
A device according to claim 1, being characterized in that said detection means includes clock pulse generating means and is arranged to detect the difference in generation timing of said feature point between temporally different field images by counting clock pulses generated by said clock pulse generating means.
Claim 7
Dependent Claim
36 words
A device according to claim 5, being characterized in that said computing means is arranged to compute the quantity of the shake of the image on the basis of a counted number of said clock pulses.
Claim 8
Dependent Claim
33 words
A device according to claim 6, being characterized by further comprising area setting means for extracting an area having a movement on said image sensing plane to designate an image shake detection area.
Claim 9
Dependent Claim
81 words
A device according to claim 7, being characterized in that said area setting means is arranged to divide said image sensing plane into an m X n number of blocks, to detect a movement part of said image sensing plane having a local image movement by comparing binary signals of a luminance level in each of said blocks between a plurality of temporally different images, and to designate an area other than said movement part as said image shake detection area.
Claim 10
Dependent Claim
30 words
A device according to claim 8, being characterized in that said sensitivity control means is arranged to control a sensitivity of said detection means by varying a clock signal frequency.
Claim 11
Dependent Claim
36 words
A device according to claim 9, being characterized in that said sensitivity control means is arranged to lower the sensitivity at said movement part and to raise the sensitivity at a part having not much movement
Claim 12
Dependent Claim
35 words
A device according to claim 10, being characterized in that said sensitivity control means is arranged to vary stepwise the sensitivity of said detection means in each of said m X n number of blocks.
Claim 13
Dependent Claim
112 words
An image shake detecting device being characterized by comprising: a) scanning means for scanning at the same speed a plurality of images obtained at intervals of a predetermined period of time; b) detection means for detecting a time difference between said plurality of images in timing at which corresponding points of feature are generated during a scanning process of said scanning means, by counting the number of clock pulses; c) computing means for detecting a quantity of a shake of an image by computing an output of said detection means; and d) sensitivity control means for varying a detection sensitivity of said detection means by changing a period of said clock pulses.
Claim 14
Dependent Claim
112 words
An image shake detecting device being characterized by comprising: a) scanning means for scanning at the same speed a plurality of images obtained at intervals of a predetermined period of time; b) detection means for detecting a time difference between said plurality of images in timing at which corresponding points of feature are generated during a scanning process of said scanning means, by counting the number of clock pulses; c) computing means for detecting a quantity of a shake of an image by computing an output of said detection means; and d) sensitivity control means for varying a detection sensitivity of said detection means by changing a period of said clock pulses.
Claim 15
Dependent Claim
34 words
A device according to claim 12, being characterized by further comprising compensating means for compensating the quantity of the shake on the basis of a result of a computing operation of said computing means.
Claim 16
Dependent Claim
37 words
A device according to claim 13, being characterized in that said compensating means is a variable apex-angle prism for compensating an optical axis of a -photo-taking optical system which forms an object image on image sensing means.
Claim 17
Dependent Claim
33 words
A device according to claim 13, being characterized in that said computing means is arranged to compute the quantity of the shake on the basis of a counted number of said clock pulses.
Claim 18
Dependent Claim
33 words
A device according to claim 15, being characterized by further comprising area setting means for extracting an area having a movement on an image sensing plane to designate an image shake detection area.
Claim 19
Dependent Claim
80 words
A device according to claim 16, being characterized in that said area setting means is arranged to divide said image sensing plane into an m X n number of blocks, to detect a movement part of said image sensing plane having a local movement by comparing, between a plurality of temporally different images, binary signals of a luminance level in each of said blocks, and to designate an area other than said movement part as said image shake detection area.
Claim 20
Dependent Claim
31 words
A device according to claim 17, being characterized in that said sensitivity control means is arranged to control a detection sensitivity of said detection means by varying a clock signal frequency.
Claim 21
Dependent Claim
34 words
A device according to claim 18, being characterized in that said sensitivity control means is arranged to lowerthe sensitivity at said movement part and to raise the sensitivity ata part having not much movement.
Claim 22
Dependent Claim
35 words
A device according to claim 19, being characterized in that said sensitivity control means is arranged to vary stepwise the sensitivity of said detection means in each of said m X n number of blocks.
Claim 23
Dependent Claim
105 words
A control device for an image sensing optical system, being characterized by comprising: a) first control means for feedback-controlling said image sensing optical system on the basis of detection information obtained by timewise dispersively detecting a state of said image sensing optical system; b) memory means for storing control information obtained on the basis of a quantity of control performed over said image sensing optical system when said detection information is sampled; and c) second control means for controlling said image sensing optical system on the basis of a result obtained by computing said control information stored in said memory means and said detection information.
Claim 24
Dependent Claim
105 words
A control device for an image sensing optical system, being characterized by comprising: a) first control means for feedback-controlling said image sensing optical system on the basis of detection information obtained by timewise dispersively detecting a state of said image sensing optical system; b) memory means for storing control information obtained on the basis of a quantity of control performed over said image sensing optical system when said detection information is sampled; and c) second control means for controlling said image sensing optical system on the basis of a result obtained by computing said control information stored in said memory means and said detection information.
Claim 25
Dependent Claim
26 words
A device according to claim 21, being characterized by further comprising a compensating optical system for varying an optical axis of said image sensing optical system.
Claim 26
Dependent Claim
54 words
A device according to claim 22, being characterized in that said detection information represents a quantity of a shake of said image sensing optical system, and said first control means is arranged to compensate a state of said compensating optical system to decrease the quantity of the shake in accordance with said detection information.
Claim 27
Dependent Claim
30 words
A device according to claim 23, being characterized in that said compensating optical system is a variable apex-angle prism for varying the optical axis of said image sensing optical system.
Claim 28
Dependent Claim
33 words
A device according to claim 24, being characterized in that said memory means is arranged to store a quantity of a control over said compensating optical system for a compensation of the shake.
Claim 29
Dependent Claim
38 words
A device according to claim 25, being characterized in that said second control means is arranged to supply a previous quantity of a control stored in said memory means to a control loop of said first control means.
Claim 30
Dependent Claim
47 words
A device according to claim 26, being characterized in that said first control means is arranged to control said compensating optical system on the basis of a value obtained by adding current detection information to the previous quantity of the control supplied from said second control means.
Claim 31
Dependent Claim
28 words
A device according to claim 27, being characterized in that said second control means includes means for multiplying information stored in said memory means by a predetermined coefficient.
Claim 32
Dependent Claim
39 words
A device according to claim 28, being characterized in that a detecting period of said detection information and a period of said control are set at a value which is an integer times as much as one field period.
Claim 33
Dependent Claim
31 words
A device according to claim 28, being characterized in that the quantity of the control stored in said memory means is a quantity of an actual operation of a controlled system.
Claim 34
Dependent Claim
96 words
A feedback control device, being characterized by comprising: a) a first control system for feedback-controlling a controlled system on the basis of detection information obtained by timewise dispersively detecting a state of said controlled system; b) memory means for storing control information based on a quantity of a control over said controlled system when said detection information is sampled; and c) a second control system for performing a compensating action on said first control system on the basis of a result obtained by computing said detection information and said control information stored in said memory means.
Claim 35
Dependent Claim
96 words
A feedback control device, being characterized by comprising: a) a first control system for feedback-controlling a controlled system on the basis of detection information obtained by timewise dispersively detecting a state of said controlled system; b) memory means for storing control information based on a quantity of a control over said controlled system when said detection information is sampled; and c) a second control system for performing a compensating action on said first control system on the basis of a result obtained by computing said detection information and said control information stored in said memory means.
Claim 36
Dependent Claim
38 words
A device according to claim 31, being characterized in that said second control system is arranged to supply a previous quantity of a control stored in said storing means to a control loop of said first control system.
Claim 37
Dependent Claim
54 words
A device according to claim 32, being characterized in that said first control system is arranged to control said controlled system on the basis of a value obtained by adding a quantity of a control based on a current detection information to the previous quantity of the control supplied from said second control system.
Claim 38
Dependent Claim
28 words
A device according to claim 33, being characterized in that said second control system includes means for multiplying information stored in said memory means by a predetermined coefficient.
References Cited (Backward Citations)
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