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Automatic focus control by use of component value differences in an image sensing plane

Assignee: Canon Inc
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Filing: 1994-07-20
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Granted: 1995-06-06
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Expires: 2014-07-20
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Abstract

Abstract An automatic focusing device comprises a binary coded information producing unit for producing binary coded information by comparing the levels of a predetermined component in each of a plurality of areas set on an image sensing plane of and image sensor with a predetermined value, a first detector for comparing binary coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to produce a signal based on the difference between the two binary coded information, a second detector for detecting a total value, for one image plane, of differences in the predetermined component between adjacent areas among the plurality of areas of the image sensing plane, a computing unit for obtaining a degree of relative variations in information on images formed on the image sensing plane in different fields by computing the result of detection made by the first and second detectors and a control unit for controlling a focus adjusting action on the basis of an output of the computing unit.

Inventors

  • 👤 Kunihiko Yamada
  • 👤 Akihiro Fujiwara
  • 👤 Masamichi Toyama
  • 👤 Hirofumi Suda
  • 👤 Kitahiro Kaneda
  • 👤 Katsuji Yoshimura

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 08:56
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/144; H04N5/145; G; G02; G02B; G02B7/00; G02B7/28; G02B7/36

Claims Analysis

Total Claims: 64
Claim 1
Independent Claim 182 words
An automatic focusing device comprising: a) binary coded information producing means for producing binary coded information by comparing the levels of a predetermined component in each of a plurality of areas set on an image sensing plane of image sensing means with a predetermined value; b) first detecting means for comparing binary coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to produce a signal based on the difference between the two binary coded information; c) second detecting means for detecting a total value, for one image plane, of differences in said predetermined component between adjacent areas among said plurality of areas of said image sensing plane; d) computing means for obtaining a degree of relative variations in information on images formed on said image sensing plane in different fields by computing the result of detection made by said first and second detecting means; and e) control means for controlling a focus adjusting action on the basis of an output of said computing means.
Claim 2
Dependent Claim 182 words
An automatic focusing device comprising: a) binary coded information producing means for producing binary coded information by comparing the levels of a predetermined component in each of a plurality of areas set on an image sensing plane of image sensing means with a predetermined value; b) first detecting means for comparing binary coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to produce a signal based on the difference between the two binary coded information; c) second detecting means for detecting a total value, for one image plane, of differences in said predetermined component between adjacent areas among said plurality of areas of said image sensing plane; d) computing means for obtaining a degree of relative variations in information on images formed on said image sensing plane in different fields by computing the result of detection made by said first and second detecting means; and e) control means for controlling a focus adjusting action on the basis of an output of said computing means.
Claim 3
Dependent Claim 25 words
A device according to claim 1, wherein said predetermined component is a luminance signal component in an image signal outputted from said image sensing means.
Claim 4
Dependent Claim 29 words
A device according to claim 1, wherein said computing means is arranged to normalize an output of said first detecting means with an output of said second detecting means.
Claim 5
Dependent Claim 42 words
A device according to claim 1, wherein said computing means is arranged to compute outputs of said first and second detecting means, to judge whether said relative variations are based on a movement of said device or a movement of an object.
Claim 6
Dependent Claim 79 words
A device according to claim 4, wherein said control means is arranged to judge that said relative variations are based on the movement of the object when said relative variations are lower than a predetermined value as the result of computation of said computing means and to judge that said relative movements are based on the movement of said device when said relative variations are higher than the predetermined value as the result of computation of said computing means.
Claim 7
Dependent Claim 71 words
A device according to claim 5, wherein said control means is arranged to continue the operation of said focus adjusting means when said relative variations are judged to be based on the movement of the device as a result of computation of said computing means and to stop the operation of said focus adjusting means when said relative variations are judged to be not based on the movement of said device.
Claim 8
Dependent Claim 30 words
An apparatus according to claim 1, wherein said second detecting means detects the total value of differences in said predetermined component between vertically adjacent areas of said image sensing plane.
Claim 9
Dependent Claim 112 words
An automatic focusing device comprising: a) luminance difference producing means for producing information on a luminance difference between adjacent areas among a plurality of areas set on an image sensing plane of image sensing means; b) first detecting means for detecting variations of information on the luminance difference in a plurality of fields differing timewise from each other; c) computing means for obtaining a degree of relative variations of information images formed on the image sensing plane in different fields by computing the result of detection made by said first detecting means; and d) control means for controlling a focus adjusting action on the basis of an output of said computing means.
Claim 10
Dependent Claim 112 words
An automatic focusing device comprising: a) luminance difference producing means for producing information on a luminance difference between adjacent areas among a plurality of areas set on an image sensing plane of image sensing means; b) first detecting means for detecting variations of information on the luminance difference in a plurality of fields differing timewise from each other; c) computing means for obtaining a degree of relative variations of information images formed on the image sensing plane in different fields by computing the result of detection made by said first detecting means; and d) control means for controlling a focus adjusting action on the basis of an output of said computing means.
Claim 11
Dependent Claim 14 words
A device according to claim 8, wherein said image sensing means is a CCD.
Claim 12
Dependent Claim 34 words
A device according to claim 8, wherein said control means is arranged to lock said focus adjusting action into a stopped state when the output of said computing means is above a predetermined value.
Claim 13
Dependent Claim 33 words
A device according to claim 10, wherein said control means is arranged to allow said focus adjusting action to continue when the output of said computing means is less than said predetermined value.
Claim 14
Dependent Claim 25 words
A device according to claim 11, further comprising second detecting means for detecting a cluttered degree of image information formed on said image sensing plane.
Claim 15
Dependent Claim 33 words
A device according to claim 12, wherein said computing means is arranged to produce information obtained by normalizing an output of said first detecting means with an output of said second detecting means.
Claim 16
Dependent Claim 33 words
A device according to claim 13, wherein said second detecting means is arranged to detect a total, for one image plane, of luminance differences between horizontally adjacent areas of said image sensing plane.
Claim 17
Dependent Claim 33 words
A device according to claim 13, wherein said second detecting means is arranged to detect a total, for one image plane, of luminance differences between vertically adjacent areas of said image sensing plane.
Claim 18
Dependent Claim 17 words
A device according to claim 8, wherein said information on the luminance difference is binary coded information.
Claim 19
Dependent Claim 28 words
A device according to claim 8, wherein said luminance difference producing means is arranged to obtain a luminance difference between horizontally adjacent areas on said image sensing plane.
Claim 20
Dependent Claim 28 words
A device according to claim 8, wherein said luminance difference producing means is arranged to obtain a luminance difference between vertically adjacent areas on said image sensing plane.
Claim 21
Dependent Claim 25 words
A device according to claim 8, further comprising second detecting means for detecting a cluttered degree of image information formed on said image sensing plane.
Claim 22
Dependent Claim 33 words
A device according to claim 19, wherein said computing means is arranged to produce information obtained by normalizing an output of said first detecting means with an output of said second detecting means.
Claim 23
Dependent Claim 33 words
A device according to claim 20, wherein said second detecting means is arranged to detect a total, for one image plane, of luminance differences between horizontally adjacent areas of said image sensing plane.
Claim 24
Dependent Claim 33 words
A device according to claim 20, wherein said second detecting means is arranged to detect a total, for one image plane, of luminance differences between vertically adjacent areas of said image sensing plane.
Claim 25
Dependent Claim 22 words
A device according to claim 8, wherein said plurality of areas is set in a lattice-like form on said image sensing plane.
Claim 26
Dependent Claim 162 words
An image receiving apparatus having an image movement detecting device comprising: a) digital coding means arranged to sample information on an image on an image plane of image receiving means in a plurality of areas of said image plane, and to digital-code the sampled information in accordance with a predetermined algorithm to produce digital coded information; b) detecting means for comparing digital coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in digital coded information; and c) computing means for computing information on a position on the image plane of an area in which the change in the digital coded information has been detected by said detecting means to detect a moved position of image information on said image plane; and d) control means for controlling a focus adjusting operation on the basis of an output of said computing means.
Claim 27
Dependent Claim 162 words
An image receiving apparatus having an image movement detecting device comprising: a) digital coding means arranged to sample information on an image on an image plane of image receiving means in a plurality of areas of said image plane, and to digital-code the sampled information in accordance with a predetermined algorithm to produce digital coded information; b) detecting means for comparing digital coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in digital coded information; and c) computing means for computing information on a position on the image plane of an area in which the change in the digital coded information has been detected by said detecting means to detect a moved position of image information on said image plane; and d) control means for controlling a focus adjusting operation on the basis of an output of said computing means.
Claim 28
Dependent Claim 27 words
A device according to claim 24, wherein said digital coding means is arranged to detect a luminance difference between horizontally adjacent areas on said image sensing plane.
Claim 29
Dependent Claim 27 words
A device according to claim 24, wherein said digital coding means is arranged to detect a luminance difference between vertically adjacent areas on said image sensing plane.
Claim 30
Dependent Claim 30 words
A device according to claim 24, wherein said digital coding means is arranged to sample the luminance signal component contained in the image signal outputted from said image receiving means.
Claim 31
Dependent Claim 30 words
A device according to claim 24, wherein said detecting means is arranged to normalize the change in the information with a signal indicating a cluttered degree of a picture plane.
Claim 32
Dependent Claim 43 words
A device according to claim 28, wherein said computing means is arranged to judge whether said change is based on a movement of said apparatus or based on a movement of the object, on the basis of an output of said detecting means.
Claim 33
Dependent Claim 50 words
An apparatus according to claim 29, wherein said control means is arranged to detect an area of an object image on the basis of a result of computation of said computing means and to change a size of the focus detecting area according to the area of said object image.
Claim 34
Dependent Claim 63 words
An apparatus according to claim 29, wherein said control means is arranged to continue said focus adjusting operation when said change is judged to be not based on the movement of said apparatus as the result of computation of said computing means and to stop said focus adjusting operation when said change is judged to be based on the movement of said apparatus.
Claim 35
Dependent Claim 47 words
An apparatus according to claim 24, wherein said control means is arranged to detect a moved position of an object image on the basis of a result of computation of said computing means and to cause a position of focus detecting area to follow said object image.
Claim 36
Dependent Claim 176 words
An image movement detecting device comprising: a) binary coding means movement arranged to sample information on an image on an image plane of image receiving means in a plurality of areas of said image plane, and to binary-code the sampled information in accordance with a predetermined algorithm to produce binary coded information; b) first detecting means for comparing binary coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) second detecting means for detecting a cluttered degree of image information on said image plane; d) computing means for computing information on a position on the image plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information on said image plane; and e) focus control means for controlling a focus condition on the basis of an output of said computing means.
Claim 37
Dependent Claim 176 words
An image movement detecting device comprising: a) binary coding means movement arranged to sample information on an image on an image plane of image receiving means in a plurality of areas of said image plane, and to binary-code the sampled information in accordance with a predetermined algorithm to produce binary coded information; b) first detecting means for comparing binary coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) second detecting means for detecting a cluttered degree of image information on said image plane; d) computing means for computing information on a position on the image plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information on said image plane; and e) focus control means for controlling a focus condition on the basis of an output of said computing means.
Claim 38
Dependent Claim 36 words
An apparatus according to claim 33, wherein said focus control means is arranged to set the focus detecting area at a position of the image information computed by said computing means formed on said image plane.
Claim 39
Dependent Claim 46 words
An apparatus according to claim 34, wherein said focus control means includes means for effecting focus adjustment by extracting a high frequency component, which varies in response to a focus condition, from an output signal of said image sensing means corresponding to said focus detecting area.
Claim 40
Dependent Claim 215 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image formed on an image sensing plane of image sensing means in a plurality of areas on said image sensing plane, and to binary-code the sampled information in accordance with a predetermined law to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) computing means for computing information on a position on the image sensing plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information formed on said image sensing plane; d) zone setting means for setting a focus detecting zone on said image sensing plane; and e) control means for controlling a position of said focus detecting zone on said image sensing plane by controlling said zone setting means according to an output of said computing means, said binary coding means being arranged to binary-code a luminance difference between adjacent areas on said image sensing plane to produce binary coded information.
Claim 41
Dependent Claim 215 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image formed on an image sensing plane of image sensing means in a plurality of areas on said image sensing plane, and to binary-code the sampled information in accordance with a predetermined law to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) computing means for computing information on a position on the image sensing plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information formed on said image sensing plane; d) zone setting means for setting a focus detecting zone on said image sensing plane; and e) control means for controlling a position of said focus detecting zone on said image sensing plane by controlling said zone setting means according to an output of said computing means, said binary coding means being arranged to binary-code a luminance difference between adjacent areas on said image sensing plane to produce binary coded information.
Claim 42
Dependent Claim 25 words
An apparatus according to claim 36, further comprising second detecting means for detecting a cluttered degree of image information formed on said image sensing plane.
Claim 43
Dependent Claim 61 words
An apparatus according to claim 37, wherein said computing means is arranged to produce information obtained by normalizing an output of said first detecting means with an output of said second detecting means, and said second detecting means is arranged to produce a total, for one image plane, of luminance differences obtained between vertically adjacent areas among said plurality of areas.
Claim 44
Dependent Claim 46 words
An apparatus according to claim 38, wherein said focus control means includes means for effecting focus adjustment by extracting a high frequency component, which varies in response to a focus condition, from an output signal of said image sensing means corresponding to said focus detecting area.
Claim 45
Dependent Claim 211 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image formed on an image sensing plane of image sensing means in a plurality of areas on said image sensing plane, and to binary-code the sampled information in accordance with a predetermined law to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) computing means for computing information on a position on the image sensing plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information formed on said image sensing plane; d) zone setting means for setting a focus detecting zone on said image sensing plane; and e) control means for controlling a position of said focus detecting zone on said image sensing plane by controlling said zone setting means according to an output of said computing means, said binary coding means being arranged to detect a luminance difference between horizontally adjacent areas on said image sensing plane.
Claim 46
Dependent Claim 211 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image formed on an image sensing plane of image sensing means in a plurality of areas on said image sensing plane, and to binary-code the sampled information in accordance with a predetermined law to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) computing means for computing information on a position on the image sensing plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information formed on said image sensing plane; d) zone setting means for setting a focus detecting zone on said image sensing plane; and e) control means for controlling a position of said focus detecting zone on said image sensing plane by controlling said zone setting means according to an output of said computing means, said binary coding means being arranged to detect a luminance difference between horizontally adjacent areas on said image sensing plane.
Claim 47
Dependent Claim 25 words
An apparatus according to claim 40, further comprising second detecting means for detecting a cluttered degree of image information formed on said image sensing plane.
Claim 48
Dependent Claim 61 words
An apparatus according to claim 41, wherein said computing means is arranged to produce information obtained by normalizing an output of said first detecting means with an output of said second detecting means, and said second detecting means is arranged to produce a total, for one image plane, of luminance differences obtained between vertically adjacent areas among said plurality of areas.
Claim 49
Dependent Claim 46 words
A device according to claim 42, wherein said focus control means includes means for effecting focus adjustment by extracting a high frequency component, which varies in response to a focus condition, from an output signal of said image sensing means corresponding to said focus detecting area.
Claim 50
Dependent Claim 211 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image formed on an image sensing plane of image sensing means in a plurality of areas on said image sensing plane, and to binary-code the sampled information in accordance with a predetermined law to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) computing means for computing information on a position on the image sensing plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information formed on said image sensing plane; d) zone setting means for setting a focus detecting zone on said image sensing plane; and e) control means for controlling a position of said focus detecting zone on said image sensing plane by controlling said zone setting means according to an output of said computing means, said binary coding means being arranged to detect a luminance difference between vertically adjacent areas on said image sensing plane.
Claim 51
Dependent Claim 211 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image formed on an image sensing plane of image sensing means in a plurality of areas on said image sensing plane, and to binary-code the sampled information in accordance with a predetermined law to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) computing means for computing information on a position on the image sensing plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information formed on said image sensing plane; d) zone setting means for setting a focus detecting zone on said image sensing plane; and e) control means for controlling a position of said focus detecting zone on said image sensing plane by controlling said zone setting means according to an output of said computing means, said binary coding means being arranged to detect a luminance difference between vertically adjacent areas on said image sensing plane.
Claim 52
Dependent Claim 25 words
An apparatus according to claim 44, further comprising, second detecting means for detecting a cluttered degree of image information formed on said image sensing plane.
Claim 53
Dependent Claim 61 words
An apparatus according to claim 45, wherein said computing means is arranged to produce information obtained by normalizing an output of said first detecting means with an output of said second detecting means, and said second detecting means is arranged to produce a total, for one image plane, of luminance differences obtained between vertically adjacent areas among said plurality of areas.
Claim 54
Dependent Claim 45 words
An apparatus according to claim 46, wherein said control means includes means for effecting focus adjustment by extracting a high frequency component, which varies in response to a focus condition, from an output signal of said image sensing means corresponding to said focus detecting area.
Claim 55
Dependent Claim 234 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image on an image plane of image receiving means in a plurality of areas on said image plane, and to binary-code the sampled information in accordance with a predetermined algorithm to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) second detecting means for producing a total, for one image plane, of luminance differences obtained between vertically adjacent areas among said plurality of areas; d) computing means for computing information on a position on the image plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information on said image plane; e) zone setting means for setting a focus detecting zone on said image plane; and f) control means for controlling a position of said focus detecting zone on said image plane by controlling said zone setting means according to an output of said computing means, said computing means being arranged to produce information obtained by normalizing an output of said first detecting means with an output of said second detecting means.
Claim 56
Dependent Claim 234 words
An automatic focusing device comprising: a) binary coding means arranged to sample information on an image on an image plane of image receiving means in a plurality of areas on said image plane, and to binary-code the sampled information in accordance with a predetermined algorithm to produce binary coded information; b) first detecting means for comparing binary coded information in each of said plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to detect a change in the binary coded information; c) second detecting means for producing a total, for one image plane, of luminance differences obtained between vertically adjacent areas among said plurality of areas; d) computing means for computing information on a position on the image plane of an area in which the change in the binary coded information has been detected by said first detecting means to detect a moved position of image information on said image plane; e) zone setting means for setting a focus detecting zone on said image plane; and f) control means for controlling a position of said focus detecting zone on said image plane by controlling said zone setting means according to an output of said computing means, said computing means being arranged to produce information obtained by normalizing an output of said first detecting means with an output of said second detecting means.
Claim 57
Dependent Claim 45 words
An apparatus according to claim 48, wherein said control means includes means for effecting focus adjustment by extracting a high frequency component, which varies in response to a focus condition, from an output signal of said image sensing means corresponding to said focus detecting area.
Claim 58
Dependent Claim 109 words
An image processing apparatus having a focus control device, comprising: (A) digital conversion means for converting image signals corresponding to a plurality of blocks set in a picture plane, respectively, into digital signals; (B) movement detecting means arranged to detect a change of digital signals in each block between picture planes, thereby detecting the block where the change of movement between said picture planes occurs; (C) computing means for computing an output of said movement detecting means, thereby judging the movement of a main image in said picture plane; and (D) control means for controlling said focus control device on the basis of an output of said computing means.
Claim 59
Dependent Claim 109 words
An image processing apparatus having a focus control device, comprising: (A) digital conversion means for converting image signals corresponding to a plurality of blocks set in a picture plane, respectively, into digital signals; (B) movement detecting means arranged to detect a change of digital signals in each block between picture planes, thereby detecting the block where the change of movement between said picture planes occurs; (C) computing means for computing an output of said movement detecting means, thereby judging the movement of a main image in said picture plane; and (D) control means for controlling said focus control device on the basis of an output of said computing means.
Claim 60
Dependent Claim 56 words
An apparatus according to claim 50, wherein said digital conversion means is arranged to binary code a luminance signal level in each of said blocks, and said computing means is arranged to detect an amount of movement on the basis of a total sum of the blocks where changes of the binary coded luminance level occur.
Claim 61
Dependent Claim 70 words
An apparatus according to claim 51, wherein said computing means is arranged to judge whether the movement of said image is a movement of said main image or a movement of said apparatus on the basis of amount of said movement, and said control means is arranged to stop the focus adjusting operation of said focus control device when the movement of said image is the movement of said apparatus.
Claim 62
Dependent Claim 45 words
An apparatus according to claim 51, wherein said computing means is arranged to compute a moved position of said main image in said picture plane, and said control means is arranged to set a focus detecting area at the moved position of said main image.
Claim 63
Dependent Claim 37 words
An apparatus according to claim 50, comprising cluttered degree detecting means for detecting a cluttered degree of a picture plane on the basis of an output of said digital conversion means corresponding to each of said blocks.
Claim 64
Dependent Claim 30 words
An apparatus according to claim 54, wherein said computing means is arranged to normalize the output of said movement detecting means with the output of said cluttered degree detecting means.

References Cited (Backward Citations)

US4816919A Cited
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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) 1998-06-05 1998-12-05 1999-06-06 $2000.00 Window Closed / Lapsed
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11.5 Years (Year 12) 2006-06-05 2006-12-05 2007-06-06 $7700.00 Window Closed / Lapsed

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