WO2013015036A1 - Système à mise au point automatique et son procédé de commande opérationnelle - Google Patents

Système à mise au point automatique et son procédé de commande opérationnelle Download PDF

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Publication number
WO2013015036A1
WO2013015036A1 PCT/JP2012/065308 JP2012065308W WO2013015036A1 WO 2013015036 A1 WO2013015036 A1 WO 2013015036A1 JP 2012065308 W JP2012065308 W JP 2012065308W WO 2013015036 A1 WO2013015036 A1 WO 2013015036A1
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Prior art keywords
focus
lens
frame
image
face image
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PCT/JP2012/065308
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English (en)
Japanese (ja)
Inventor
佐々木　正
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富士フイルム株式会社
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Publication of WO2013015036A1 publication Critical patent/WO2013015036A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • G02B7/38—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals measured at different points on the optical axis, e.g. focussing on two or more planes and comparing image data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method

Definitions

  • This invention relates to an autofocus system and its operation control method.
  • a contrast method (so-called optical path length difference method) using a plurality of AF CCDs has been proposed as an AF (auto focus) method.
  • the focus lens is controlled so that the focus evaluation value obtained from the first AF CCD is equal to the focus evaluation value obtained from the second AF CCD.
  • Patent Document 1 In the case of a subject with low contrast such as a face, the focus lens is moved per unit time in an infinite / closest direction with an amplitude larger than a reference value (Patent Document 1). There are those that increase the driving speed of the lens (Patent Document 2) and those that calculate the shooting distance when a face is detected (Patent Document 3).
  • auto-focus is also designed so as to be suitable for imaging a human face. Even when the focusing speed is moved in accordance with the difference between the two focus evaluation values in the so-called optical path length difference type auto-focusing, it is often designed to be suitable for focusing when imaging a human face. It is done. However, because buildings and nature other than the human face have high spatial frequencies, so-called hunting occurs when the optical path length difference autofocus is designed to be suitable for focusing when imaging the human face. May end up.
  • An object of the present invention is to enable focusing relatively quickly even when imaging a human face without causing hunting as much as possible.
  • the auto-focus system includes a first solid-state electronic imaging device and a second solid-state electronic device that are optically arranged at equal intervals in the front-rear direction with respect to the position of the subject image formed by the focus lens.
  • the first contrast of the image in the AF frame and the subject image captured by the second solid-state electronic image sensor within the AF frame A focus / lens moving means for moving the focus lens to a position where the second contrast of the image matches, a face image determining means for determining whether a face image is detected in the AF frame, and the face image determination
  • the focus / lens moving means A focus / lens movement control means for controlling the focus / lens movement means is provided so that the moving speed is faster than when it is determined that a face image is not detected in the AF frame. .
  • the present invention also provides an operation control method suitable for the auto focus system. That is, in this method, the first and second solid-state electronic imaging devices in which the focus / lens moving means are optically arranged at equal intervals in the front / rear direction with respect to the position of the subject image formed by the focus / lens.
  • the focus lens moving unit is configured to select a first of the images in the AF frame among the subject images captured by the first solid-state electronic image sensor. The focus lens is moved to a position where the second contrast of the image within the AF frame of the subject image captured by the second solid-state electronic image sensor matches the second contrast.
  • the focus / lens movement control means determines that the face image is within the AF frame by the face image determination means.
  • the focus / lens moving means causes the focus / lens moving speed to be increased in response to the determination that the face image has been released compared to when it is determined that no face image is detected within the AF frame. -It controls the lens moving means.
  • the first solid-state electronic image sensor and the second solid-state electronic image sensor are disposed at optically equidistant positions relative to the position of the subject image formed by the focus lens. .
  • the focus lens is moved to a position where the contrast matches.
  • the moving speed of the focus lens increases.
  • the focus lens can be positioned relatively quickly at the in-focus position, and when no face is detected in the AF frame, the speed is relatively slow compared to when the face is detected. Since the focus lens is positioned, the occurrence of hunting can be prevented.
  • a contrast difference detecting means for detecting a difference between the first contrast and the second contrast may be further provided.
  • the focus / lens moving means increases the moving speed of the focus / lens as the contrast difference between the first contrast and the second contrast detected by the contrast difference detecting means increases. It will be.
  • a zoom lens that changes the focal length without changing the imaging position of the subject image, a diaphragm that adjusts the brightness of the subject image, a setting device that sets the moving speed of the focus lens by the focus lens moving means, and And a moving speed determining means for determining the moving speed of the focus lens by the focus lens moving means based on the zoom position of the zoom lens, the aperture value of the diaphragm and the moving speed set by the setting device. May be.
  • the focus / lens movement control means increases the movement speed determined by the movement speed determination means when, for example, the face image setting means determines that a face image is detected within the AF frame. It may be a thing.
  • a third solid-state electronic image sensor that is disposed at a position optically equal to the position of the subject image formed by the focus lens and outputs a video signal representing the subject image may be further provided.
  • the face image determination means will determine whether a face image is detected in the AF frame from the video signal output from the third solid-state electronic image sensor.
  • FIG. 2 shows an optical configuration of a taking lens unit.
  • the relationship between the AF CCD and the imaging position of the subject image is shown.
  • the relationship between the AF evaluation value and the focus / lens position is shown.
  • the relationship between the imaging range and the AF frame is shown.
  • the relationship between the AF evaluation value and the focus / lens position is shown.
  • the relationship between the AF evaluation value and the focus / lens position is shown.
  • It is a flowchart which shows the process sequence of a photographic lens unit.
  • the appearance of the taking lens unit is shown.
  • FIG. 1 shows an embodiment of the present invention, and shows an optical configuration of a part of a photographing lens unit 1 and a camera body 20 used for broadcasting or the like.
  • the taking lens unit 1 is detachably attached to the camera body 20.
  • the photographic lens unit 1 includes a focus lens (focus lens group) 2, a zoom lens (zoom lens group) 3, and a front relay so as to have an optical axis common to the optical axis O1 of the photographic lens unit 1
  • a lens (front relay / lens group) 5 and a rear relay / lens (rear relay / lens group) 7 are included.
  • a diaphragm 4 is arranged between the zoom lens 3 and the front relay lens 5 so that the optical axis O1 of the photographing lens unit 1 passes through the center.
  • a half mirror 6 is arranged between the front relay lens 5 and the rear relay lens 7.
  • the camera body 20 is provided with a color separation prism 21 having an optical axis common to the optical axis O1 of the photographing lens unit 1 when the photographing lens unit 1 is mounted.
  • the color separation prism 21 includes a first prism 22, a second prism 23, and a third prism 24, and incident light is separated into a red component, a green component, and a blue component.
  • An imaging CCD 26 and a third imaging CCD 27 are arranged.
  • the photographing lens unit 1 includes an AF relay lens (AF relay lens) that uses a part of the light reflected at the center of the half mirror 6 as an optical axis [optical axis for AF (auto focus)] O2.
  • Lens group 8 is provided.
  • a total reflection mirror 9 is provided after the AF relay lens 8.
  • a split prism 10 composed of a first prism 11 and a second prism 12 is provided in the total reflection direction of the total reflection mirror 9.
  • a first AF CCD 13 and a second AF CCD 14 are provided on the exit surface of the first prism 11 and the exit surface of the second prism 12, respectively.
  • the light beam incident on the photographic lens unit 1 passes through the focus lens 2, zoom lens 3, aperture 4, front relay lens 5, half mirror 6 and rear relay lens 7, and enters the camera body 20. Led.
  • the light beam is decomposed into a red light component, a green light component, and a blue light component, respectively, and the first image pickup CCD 25, the second image pickup CCD 26, and the third image pickup device.
  • a subject image is formed on each of the CCDs 27 for use.
  • Video signals representing subject images of the red light component, the green light component, and the blue light component are output from the first imaging CCD 25, the second imaging CCD 26, and the third imaging CCD 27, respectively.
  • the light beam incident on the taking lens unit 1 is partially reflected by the half mirror 6.
  • the light beam reflected by the half mirror 6 passes through the AF relay lens 8 and is totally reflected by the total reflection mirror 9.
  • the light beam totally reflected by the total reflection mirror 9 enters the split prism 10, a part of the light enters the first AF CCD 13, and the rest enters the second AF CCD 14.
  • An AF signal is output from each of the first AF CCD 13 and the second AF CCD 14.
  • FIG. 2 shows the relationship of the optical distances of the first imaging CCD 25, the second imaging CCD 26, the third imaging CCD 27, the first AF CCD 13, and the second AF CCD 14.
  • An optical system for making light incident on the first imaging CCD 25, the second imaging CCD 26, the third imaging CCD 27, the first AF CCD 13 and the second AF CCD 14 is represented by a lens 30. ing.
  • the optical distances until the light enters the first imaging CCD 25, the second imaging CCD 26, and the third imaging CCD 27 are all equal.
  • the optical distance until it enters the first AF CCD 13 is arranged a predetermined distance from the first imaging CCD 25, the second imaging CCD 26, and the third imaging CCD 27.
  • the optical distance until the light enters the second AF CCD 14 is arranged after a predetermined distance from the first imaging CCD 25, the second imaging CCD 26, and the third imaging CCD 27.
  • the positional relationship between the first imaging CCD 25, the second imaging CCD 26, the third imaging CCD 27, the first AF CCD 13, and the second AF CCD 14 (optically front and rear, etc.) The position of the interval is defined.
  • the first imaging CCD 25 the second imaging CCD 26, the third imaging CCD 27, the first AF CCD 13 and the second AF CCD 14 are arranged on the same optical axis
  • the first imaging CCD This is equivalent to the first AF CCD 13 and the second AF CCD 14 being arranged at equal intervals before and after the CCD 25 for image pickup, the second image pickup CCD 26, and the third image pickup CCD 27.
  • FIG. 3 shows the relationship between the AF evaluation value and the position of the focus lens 2.
  • the graph G13 is obtained based on the signal output from the first AF CCD 13, and the graph G14 is obtained based on the signal output from the second AF CCD 14.
  • the focus lens position P1 which is the intersection of the graphs G13 and G14 obtained from the signals of the first AF CCD 13 and the second AF CCD 14, respectively, is the first imaging CCD 25, the second imaging CCD 25, and the second imaging CCD. This is the position of the focus lens 2 where the subject image is focused on the imaging CCD 26 and the third imaging CCD 27.
  • FIG. 4 is a block diagram mainly showing an electrical configuration of the taking lens unit 1.
  • FIG. 4 also shows an electrical configuration of the focus / AF frame operation unit 70 attached to the photographing lens unit 1.
  • the overall operation of the photographic lens unit 1 is controlled by the CPU 50.
  • An EEPROM 51 that stores predetermined data is connected to the CPU 50.
  • the signal output from the first AF CCD 13 included in the photographing lens unit 1 is converted into digital data by the analog / digital conversion circuit 31.
  • High frequency components are extracted from the converted digital data by the high pass filter 32.
  • Only digital data corresponding to the image in the AF frame is extracted in the gate circuit 33 from the extracted digital data representing the high frequency component.
  • the digital data that has passed through the gate circuit 33 is integrated in the integrating circuit 34 field by field, and data representing the integrated value is input to the CPU 50 in one field cycle.
  • the signal output from the second AF CCD 14 included in the photographic lens unit 1 is converted into digital data by the analog / digital conversion circuit 41, and the high frequency component passes through the high pass filter 42. pass.
  • Digital data corresponding to the image in the AF frame passes through the gate circuit 43 and is integrated by the integration circuit 44.
  • the output data of the integrating circuit 44 is input to the CPU 50.
  • the data representing the integrated value output from the integrating circuits 43 and 44 indicates the height of the contrast of the subject image picked up by the first AF CCD 13 and the second AF CCD 14, and this contrast height. Is the AF evaluation value shown in FIG.
  • the focus lens position P1 at the intersection of the graph G13 obtained from the first AF CCD 13 and the graph G14 obtained from the second AF CCD 14 is inputted integration. It is calculated based on the value (AF evaluation value).
  • Driving data is generated in the CPU 50 so that the focus lens 2 is moved to the calculated position.
  • the generated drive data is converted into an analog control signal by the digital / analog conversion circuit 54.
  • the converted analog control signal is amplified by the amplifier circuit 58 and applied to the focus motor 59.
  • the focus lens 2 is positioned at the focus position P1 by the focus motor 59.
  • the position of the focus lens 2 is detected by the position detection sensor 60, and the detection signal is converted into digital data by the analog / digital conversion circuit 52 and input to the CPU 50.
  • the CPU 50 feedback control is performed so that the focus lens 2 is positioned at the in-focus position P1.
  • zoom request signal When a zoom request signal is given to the taking lens unit 1 by rotating the zoom ring or the like, the zoom request signal is converted into digital data by the analog / digital conversion circuit 52.
  • the CPU 50 generates zoom control data indicating the zoom amount from the converted digital data.
  • the generated zoom control data is converted into an analog control signal by the digital / analog conversion circuit 54, amplified by the amplification circuit 55, and given to the zoom motor 56.
  • a zoom motor 3 controls the zoom lens 3 to a desired zoom position.
  • a position detection sensor 57 detects the position of the zoom lens 3 and performs feedback control.
  • the aperture control data is output from the CPU 50 according to the rotation of the aperture ring, etc., and converted into digital control data by the digital / analog conversion circuit 54.
  • the converted digital control data is converted into an analog control signal by the digital / analog conversion circuit 54 and amplified by the amplifier circuit 61.
  • the amplified analog control signal is given to the diaphragm motor 62, and the diaphragm 4 is controlled.
  • the position detection sensor 63 detects the aperture value of the aperture 4 and performs feedback control.
  • the focus / AF frame operation unit 70 is attached to the photographing lens unit 1.
  • the photographing lens unit 1 and the focus / AF frame operation unit 70 are connected by a cable between a terminal 53 formed on the CPU 50 of the photographing lens unit 1 and a terminal 74 formed on the focus / AF frame operation unit 70. Is done.
  • the overall operation of the photographic lens unit 1 is controlled by the operation unit CPU73.
  • the focus request signal is input to the operation unit CPU 73.
  • the focus / AF frame operation unit 70 is formed with a focusing knob (see FIG. 5) as will be described later, and a focus request signal corresponding to the rotation angle of the focusing knob is given to the focus / AF frame operation unit 70. It is done.
  • the focus request signal is given to the taking lens unit 1, and the focus lens 2 is controlled so as to have a focus amount corresponding to the focus request signal (manual focus).
  • the focus / AF frame operation unit 70 receives an AF frame movement signal given from a joy stick (see FIG. 5).
  • the AF frame moves within the imaging range to a position defined according to the input AF frame movement signal.
  • a focus request signal is input to the operation unit CPU 73.
  • a signal indicating the position of the AF frame is given from the focus / AF frame operation unit 70 to the gate circuits 33 and 43 via the CPU 50 of the photographing lens unit 1.
  • the gate circuits 33 and 43 are controlled so that digital data corresponding to the image in the AF frame passes. Control is performed so that the AF frame is in focus.
  • the focus / AF frame operation unit 70 is a digital image obtained by digitizing video signals output from the first imaging CCD 25, the second imaging CCD 26, and the third imaging CCD 27 included in the camera body 20. Input image data. This digital image data is given to the image memory 71 and temporarily stored. Image data is read from the image memory 71 and input to the image processing circuit 72. In the image processing circuit 72, face detection processing is performed to determine whether a face image is detected within the AF frame. When a face image is detected within the AF frame, the detection signal is input to the CPU 50 of the taking lens unit 1.
  • a setting signal from an AF speed setting dial (setting device) 75 is also input to the focus / AF frame operation unit 70.
  • the AF setting speed setting dial 75 moves the focus lens 2 so that the focus lens 2 is at the focus lens position P1 (see FIG. 3) during auto-focusing. This is to set the movement speed.
  • FIG. 5 shows an external view of the focus / AF frame setting unit 70, and is a plan view.
  • an AF speed setting dial 75 capable of setting two stages of a slow setting speed and a fast setting speed is formed.
  • an AT start switch 76 which is set when the AF frame follows the detected face image when face image detection is performed.
  • the joy stick 77 for moving the AF frame up, down, left and right is formed.
  • an AF start switch 78 that is set when the autofocus process is started is formed.
  • the above-described manual focusing knob 80 is formed on the right end surface (right side in FIG. 5) of the focus / AF frame setting unit 70, and the left end surface (left side in FIG. 5) is attached to the photographing lens unit 1.
  • An attachment member 83 is formed. Furthermore, connectors 81 and 82 to which cables and the like are connected are formed on the front side (lower side in FIG. 5) of the focus / AF frame setting unit 70.
  • FIG. 6 shows the relationship between the imaging range 90 and the AF frame 91.
  • the AF frame 91 can be moved vertically and horizontally within a range (captured subject image) 90 that can be imaged by the first imaging CCD 25, the second imaging CCD 26, and the third imaging CCD 27.
  • the AF frame 91 moves by operating the joy stick 77 as described above.
  • the focus lens 2 is driven so that an image included in the AF frame is in focus.
  • the imaging ranges 90 of the first imaging CCD 25, the second imaging CCD 26, the third imaging CCD 27, and the first AF CCD 13 and the second AF CCD 14 are equal.
  • FIG. 7 shows the relationship between the AF evaluation value and the focus lens position when a face image is included in the AF frame.
  • the difference between the AF evaluation values of the graph G13 obtained from the first AF CCD 13 and the graph G14 obtained from the second AF CCD 14 gradually decreases as the focus position of the target focus lens 2 is approached. Therefore, natural focusing control can be performed by determining the moving speed of the focus lens 2 in accordance with the difference in AF evaluation values (indicated by arrows).
  • a human face As a subject to be photographed, a human face is often imaged. However, since the contrast of the face is low, when the face is included in the AF frame, the difference in AF evaluation values is small as indicated by arrows. Since the human face is often imaged, it is generally considered that the moving speed of the focus lens 2 is determined based on the difference in AF evaluation values obtained when the human face is imaged. This is because the focus lens 2 can be positioned at the in-focus position relatively quickly when imaging a human face.
  • FIG. 8 shows the relationship between the AF evaluation value and the focus / lens position when the face image is not included in the AF frame.
  • the moving speed of the focus lens 2 when a face image is detected in the AF frame is relatively higher than the moving speed of the focus lens 2 when no face image is detected in the AF frame. It's what makes it faster.
  • the focus lens 2 can be quickly moved to the target position P1 even when a face image is detected in the AF frame, and hunting can be prevented even if the face image is not detected in the AF frame. It becomes like this.
  • FIG. 9 is a flowchart showing a processing procedure of the photographing lens unit 1.
  • the initial setting of the taking lens unit 1 is performed (step 101), and processing other than auto focus is performed (step 102).
  • AF auto focus
  • the set aperture position IP of the aperture 4 is read (step 104).
  • the zoom position ZP of the zoom lens 3 is read (step 105)
  • the position of the AF speed setting dial 75 is read (step 106).
  • An AF speed (moving speed of the focus lens 2) FS is calculated from each read value, and set to the calculated AF speed FS (step 107). The calculation of the AF speed will be described later.
  • the calculated AF speed FS is corrected so as to increase. Specifically, the calculated AF speed FS is corrected by multiplying the calculated AF speed FS by a coefficient k (1 ⁇ k, for example, 1.2 to 1.4) (step 109). ). If no face image is detected in the AF frame (YES in step), the contrast in the image in the AF frame is not low, and the process of step 109, which is a correction process that increases the calculated AF speed FS, is skipped.
  • k (1 ⁇ k, for example, 1.2 to 1.4
  • the focus evaluation value fa obtained from the first AF CCD 13 and the AF evaluation value fb obtained from the second AF CCD 14 are read (step 110), and the difference between the read AF evaluation values fa and fb is The AF speed FS is multiplied (step 111).
  • the focus lens 2 is moved based on the value of the AF speed FS (step 112). Since the difference between the AF evaluation values fa and fb becomes smaller as the focus position P1 is approached, the focus lens 2 gradually becomes slower as it approaches the focus position P1, and is positioned at the focus position P1 by a natural operation. .
  • step 113 The processing from step 102 is repeated until the photographing lens unit 1 is turned off (step 113).
  • the AF speed FS is calculated so that the AF speed FS when the face image is not detected in the AF frame is an appropriate speed, and is calculated when the face image is detected in the AF frame.
  • the AF speed FS is corrected so as to increase, the AF speed FS is calculated so that the AF speed FS when the face image is detected in the AF frame becomes an appropriate speed (rapid speed). If the face image is not detected within the frame, the calculated AF speed FS may be corrected so as to become slow.
  • the AF speed FS when a face image is detected in the AF frame may be relatively faster than the AF speed FS when no face image is detected in the AF frame.
  • the sensitivity of the focus lens 2 is S
  • the sensitivity S is expressed by Equation 1.
  • x represents the entire stroke of the focus lens 2
  • ⁇ x1 is a position error of the focus lens 2 that can be determined to be in focus.
  • AF speed FS 1 / S.
  • the AF speed FS calculated in this way is multiplied by a coefficient corresponding to the set position of the AF speed setting dial 75. For example, when a slow setting speed is set, a coefficient k1 (k1 ⁇ 1 and, for example, 0.9) is multiplied. When a fast setting speed is set, a coefficient k2 (k2> 1 and, for example, 1.1) is multiplied. .
  • the AF speed FS is calculated by calculation, but the relationship between the aperture position IP, the zoom position IP, the value of the AF speed setting dial 75 and the AF speed FS is stored in advance in a table.
  • the AF speed FS may be read from the table.
  • the AF speed FS read from the table may be corrected, or the corrected AF speed may be stored in the table.
  • the AF speed may be determined by actually trial and error using values of several aperture positions IP, zoom positions ZP, and AF speed setting dial 75.
  • FIG. 10 is a flowchart showing the processing procedure of the taking lens unit 1. In FIG. 10, the same processes as those shown in FIG.
  • the AF evaluation value fa obtained from the first AF CCD 13 and the AF evaluation value fb obtained from the second AF CCD 14 are read (step 107). Step 110).
  • the difference between the read AF evaluation values fa and fb is multiplied by a coefficient k. Since the coefficient k is 1 or more, the difference between the AF evaluation values fa and fb increases. The difference between the AF evaluation values fa and fb multiplied by the coefficient k is multiplied by the set AF speed FS (step 114). Even if the contrast is low, such as a face image, the difference between the AF evaluation values fa and fb becomes large, so that the AF speed FS increases and the focus lens can be moved quickly.
  • the difference between the AF evaluation values fa and fb is not performed without performing the process of multiplying the difference between the read AF evaluation values fa and fb by the coefficient k. Is multiplied by the set AF speed FS (step 111). Since the contrast in the AF frame is high, even if the difference between the read AF evaluation values fa and fb cannot be multiplied by the coefficient k, the difference between the AF evaluation values fa and fb is multiplied by the set AF speed FS. As a result, the focus lens 2 moves quickly.
  • the photographing lens unit 1 described above includes two AF CCDs, the first AF CCD 13 and the second AF CCD 14, but the photographing lens unit shown in the embodiment shown in FIGS. 1A includes a third AF CCD 15 in addition to the first AF CCD 13 and the second AF CCD 14.
  • face image detection is performed using a video signal obtained from the imaging CCD 26 included in the camera body 20, but in this embodiment, it is included in the photographing lens unit 1A.
  • Face image detection is performed using a video signal obtained from the third AF CCD 15.
  • FIG. 11 shows the appearance of the taking lens unit 1A partially showing the internal configuration.
  • FIG. 11 is a side view of the taking lens unit 1A. In this figure, the same components as those shown in FIG.
  • a focus ring 121, a zoom lens 122, and an iris ring 123 are rotatably provided on the outer periphery of the photographing lens unit 1A.
  • the focus ring 121 is rotated, the focus lens moves in the optical axis direction according to the rotation, and when the zoom lens 122 is rotated, the zoom amount of the zoom lens is adjusted according to the rotation. It is done.
  • the iris ring 123 is rotated, the aperture value is adjusted.
  • the split prism 130 includes a first prism 131, a second prism 132, and a third prism 133. A part of the light beam incident on the splitting prism 130 is emitted from each of the first prism 131, the second prism 132, or the third prism 133, and the first AF CCD 13, the second AF CCD 14, or the The light enters the third AF CCD 15.
  • the first AF CCD 13 and the second AF CCD 14 obtain the AF evaluation value as described above based on the signals output from the first AF CCD 13 and the second AF CCD 14. Then, face image detection is performed using the video signal output from the third AF CCD 15.
  • FIG. 12 is a block diagram showing an electrical configuration of the photographing lens unit 1A. In this figure, the same components as those shown in FIG.
  • the photographing lens unit 1A includes an AF CPU 45. Position information of the AF frame is given to the gate circuits 33 and 43 through the AF CPU 45, and an AF evaluation value in the AF frame is given to the CPU 50.
  • Various switches included in the focus / AF frame operation unit 70A, an output signal from 75A, and a focus request generated by operating the AT switch 78
  • a signal auto focus
  • a signal indicating the rotation amount of the focus ring 121, and the like are input to the operation unit CPU73.
  • the data indicating the position of the AF frame from the operation unit CPU 73 of the focus / AF frame operation unit 70A to the lens CPU 50 of the photographing lens unit 1A, and the manual focus amount specified by the rotation amount of the focus ring 121 are indicated.
  • a focus request signal indicating a request for data and auto-focus is output.
  • the video signal output from the third AF CCD 15 included in the photographing lens unit 1A is converted into digital image data by the analog / digital conversion circuit 46 and input to the signal processing circuit 47.
  • Digital image data that has undergone predetermined signal processing in the signal processing circuit 47 is input to the image signal processing circuit 72 via the image memory 71 of the focus / AF frame operation unit 70A.
  • the image signal processing circuit 72 performs face image detection processing.
  • the position data of the detected face image is input to the operation unit CPU 73.
  • the operation unit CPU 73 determines that the face image is included in the AF frame, as described above, the moving speed of the focus lens 3 when the focus lens 3 is positioned at the in-focus position is relatively high. Made fast.
  • a face image can be detected without using the imaging CCD 26 included in the camera body 20.

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Abstract

L'objet de la présente invention consiste à positionner rapidement une lentille de focalisation sur la position focale lorsqu'une image d'un visage est présente dans une trame AF. Des premier et second CCD AF sont disposés en des positions correspondant à la distance optique devant et derrière la position focale d'une image d'un sujet prise par une lentille d'imagerie. Deux graphiques indiquant la relation entre la position de la lentille de focalisation et une valeur d'évaluation AF sont obtenus sur la base de signaux obtenus des premier et second CCD AF. La position d'intersection des graphiques est utilisée comme position de mouvement de la lentille de focalisation. La vitesse AF (FS), qui est la vitesse de mouvement de la lentille de focalisation, est définie (étape 107). Lorsqu'une image de visage est détectée dans la trame AF (étape 108 : OUI), la vitesse AF définie est multipliée par un coefficient (k) supérieur ou égal à 1 et corrigée (étape 109). La lentille de focalisation est déplacée à une vitesse AF qui est un multiple de la différence (fa - fb) des deux graphiques indiquant la relation entre la position de la lentille de focalisation et la valeur d'évaluation AF (étape 111, 112).
PCT/JP2012/065308 2011-07-28 2012-06-15 Système à mise au point automatique et son procédé de commande opérationnelle WO2013015036A1 (fr)

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JP2011-164944 2011-07-28

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CN105812669A (zh) * 2016-05-13 2016-07-27 大族激光科技产业集团股份有限公司 曲面自动成像对焦方法及系统
CN106094162A (zh) * 2016-08-26 2016-11-09 英华达（上海）科技有限公司 一种对焦方法

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Publication number Priority date Publication date Assignee Title
JP2005292779A (ja) * 2004-03-12 2005-10-20 Fujinon Corp オートフォーカスシステム
JP2007065593A (ja) * 2005-09-02 2007-03-15 Fujinon Corp オートフォーカスシステム
JP2010156731A (ja) * 2008-12-26 2010-07-15 Canon Inc 自動焦点調節装置及びその制御方法
JP2011118058A (ja) * 2009-12-01 2011-06-16 Fujifilm Corp 撮像素子の特性調整方法及び特性調整装置

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Publication number Priority date Publication date Assignee Title
JP2005292779A (ja) * 2004-03-12 2005-10-20 Fujinon Corp オートフォーカスシステム
JP2007065593A (ja) * 2005-09-02 2007-03-15 Fujinon Corp オートフォーカスシステム
JP2010156731A (ja) * 2008-12-26 2010-07-15 Canon Inc 自動焦点調節装置及びその制御方法
JP2011118058A (ja) * 2009-12-01 2011-06-16 Fujifilm Corp 撮像素子の特性調整方法及び特性調整装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105812669A (zh) * 2016-05-13 2016-07-27 大族激光科技产业集团股份有限公司 曲面自动成像对焦方法及系统
CN105812669B (zh) * 2016-05-13 2019-04-23 大族激光科技产业集团股份有限公司 曲面自动成像对焦方法及系统
CN106094162A (zh) * 2016-08-26 2016-11-09 英华达（上海）科技有限公司 一种对焦方法

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