WO2010149763A1 - Procédé et système de correction de la mise au point d'un appareil photo - Google Patents

Procédé et système de correction de la mise au point d'un appareil photo Download PDF

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Publication number
WO2010149763A1
WO2010149763A1 PCT/EP2010/059056 EP2010059056W WO2010149763A1 WO 2010149763 A1 WO2010149763 A1 WO 2010149763A1 EP 2010059056 W EP2010059056 W EP 2010059056W WO 2010149763 A1 WO2010149763 A1 WO 2010149763A1
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WO
WIPO (PCT)
Prior art keywords
focus
camera
sensor
autofocus
correction parameter
Prior art date
Application number
PCT/EP2010/059056
Other languages
English (en)
Inventor
Anders Poulsen
Original Assignee
Hasselblad A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hasselblad A/S filed Critical Hasselblad A/S
Publication of WO2010149763A1 publication Critical patent/WO2010149763A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • 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
    • G02B7/285—Systems for automatic generation of focusing signals including two or more different focus detection devices, e.g. both an active and a passive focus detecting device
    • 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
    • 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
    • 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
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681—Motion detection
    • H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation

Definitions

  • the present invention relates to a camera comprising an autofocus system for determining a first focus setting of an optical lens.
  • a sensor is adapted to detect a change in spatial orientation of the housing after determination of the first focus setting and generating a signal in accordance with the change.
  • the camera comprises a processor configured to determine a focus correction parameter based on a signal from the sensor and controlling the autofocus system to refocus from the first focus setting to a second focus setting in accordance with the determined focus correction parameter.
  • the autofocus correction parameter includes correction for lens field curvature.
  • the locked focus position will shift the focus in relation to the subject when the camera orientation is changed, e.g. a combination of camera tilt and swing.
  • US 2008/317453 describes a digital camera with an autofocus system that can move a focus lens between two different focal positions.
  • a moving distance acquiring unit is configured to acquire a moving distance of the camera body and a focus correction unit corrects a position of the focus lens based on the acquired moving distance.
  • US 2007/098380 discloses methods and systems for improved autofocus in digital imaging systems.
  • the autofocus system may determine an initial subject focus distance and an initial attitude, and in response to a request for an exposure, determining a finai attitude.
  • An initial subject distance may be determined based on the initial subject focus distance and a focus correction distance may be determined where the focus correction distance is based on the difference between the initial attitude and the final attitude.
  • a first aspect of the present invention relates to a camera comprising a housing including an optical lens and an autofocus system for determining a first focus setting of the optical lens.
  • a sensor is adapted to detect a change in spatial orientation of the housing after determination of the first focus setting and generating a signal in accordance with the change.
  • the camera comprises a processor with an input connected to the sensor for reception of the signal from the sensor and an output for controiling the autofocus system.
  • the processor being further configured to determine a focus correction parameter based on the signal from the sensor and controlling the autofocus system to refocus from the first focus setting to a second focus setting in accordance with the determined focus correction parameter.
  • the autofocus correction parameter includes correction for lens field curvature.
  • the above-mentioned autofocus system is contemplated to allow a photographer to establish a first autofocus setting and then re-orientate the camera to achieve a desired composition of the image at a second focus setting. Since correction of lens field curvature is included in the focus correction parameter utilized to determine the second focus setting, imperfections in lens geometry are also compensated in an efficient manner. This is particularly useful in combination with the re-focusing process between the first and second focus settings because the object to be photographed will as a result of the photographer's re-composition of the image end up at a position offset from the center of optical lens.
  • an optical lens has a perfectly flat field of sharpness.
  • a picture of a flat object will show perfect sharpness all over the entire image area in such an optical lens.
  • most practical optical lenses have a sharpness field that is slightly curved and will not produce images with full sharpness over the entire image area when photographing a flat object.
  • This lens characteristic is called "lens field curvature" and effects thereof have been illustrated in further detail below in connection with the description of Figs. 7 and 8, With detailed knowledge about the optical lens design, image position and aperture used, it is possible to calculate a distance deviation between a plane of optimum or best sharpness deviates and a theoretical flat sharpness plane.
  • the present invention is most useful for, but not limited to, handheld photographing or handheld photography.
  • optical lens is preferably detachably mounted to the housing.
  • Exchangeable optical lenses allow a photographer to use a number of different optical lenses, e.g. lenses having different focal length or other characteristics, for different purposes.
  • the camera may further include a detection device for detecting the type of lens attached to the camera housing.
  • the processor may include information on the lens type when calculating autofocus correction parameter and/or lens field curvature so as to specifically adjust the focus correction parameter to optical characteristics of the optical lens in question and improve focus correction.
  • the sensor may comprise at least one of ⁇ a gyro, a rate gyro, an accelerometer ⁇ or a combination thereof.
  • the type of sensor or sensors chosen for a specific embodiment may depend on factors such as space in the camera housing, power consumption of the sensor etc.
  • the sensor or sensors may be adapted to measure tilt and/or swing or pan of the camera housing.
  • the sensor or sensors are preferably additionally adapted to measure translatory movement of the camera housing so as to allow all types of re-orientation of the spatial orientation of the camera housing between the first and second focus settings to be accurately measured and compensated.
  • the adjustment of focus setting may be performed continuously while the camera is reorientated or be performed when the camera is again substantially at rest.
  • the processor may be configured to determine the focus correction parameter only after the autofocus system has established a focus setting.
  • the camera may comprise a focus locking device for locking the first and/or second focus setting(s).
  • the camera may be a digital camera or a camera having a digital back.
  • digital camera is meant a camera having a light sensitive sensor for recording a digital image, such as a CCD sensor or the like.
  • a digital back may be attached to a camera not originally designed for digital photography.
  • the camera may be a camera recording images on film.
  • the camera may comprise a device for measuring distance from the camera to an object viewable from the optical iens.
  • a method for correcting focus settings in a camera comprising: - establishing a first focus setting by the autofocus system,
  • the senor transmitting a signal to the processor in response to a change in spatial orientation of the housing
  • the processor determining an autofocus correction parameter for a second focus setting based on the signal from the sensor, characterized in that the autofocus correction parameter includes correction for iens field curvature.
  • the autofocus system may be configured to adjust or lock the second focus setting based on the autofocus correction parameter.
  • the locking or adjustment is preferably automatically performed by the autofocus system.
  • a first focus plane at the first focus setting is at a distance d from the camera.
  • Tilting the camera housing around more than one axis of rotation may be incorporated in the above-mentioned equation. Further, displacement of the camera housing may also be incorporated in the equation.
  • the first focus plane may advantageously be adjusted by an amount corresponding to ⁇ to obtain the second focus plane. Thereby, the ⁇ value calculated above may form the basis for a calculation of the required adjustment of the focus of the optical iens.
  • the method preferably further includes determining a distance from the camera to an object to be photographed.
  • Fig. 1 is a schematic illustration of a view in a viewfinder with one central focus point according to prior art autofocus systems
  • Fig. 2 is a schematic illustration of a view in a viewfinder with several focus points prior art autofocus systems
  • Fig. 3 is a schematic illustration of a setup where a person is in the center of the image when setting the autofocus and the consequence of tilting the camera subsequently,
  • Fig. 4 is a schematic illustration of a setup where a person is in the center of the image when setting the autofocus and the consequence of swinging or turning the camera subsequently,
  • Fig. 5 is another schematic illustration of a setup where a person is in the center of the image when setting the autofocus and the consequence of tilting the camera subsequently
  • Fig. 6 is a schematic illustration of geometrical relations between two orientations of the camera
  • Fig. 7 is an exemplary schematic illustration of the effect of lens field curvature
  • Fig. 8 is a schematic illustration of the effect of lens field curvature and a correction parameter or factor
  • Fig. 9 is a schematic illustration of a camera in accordance with a preferred embodiment of the invention.
  • Fig. 1 schematically illustrates the view 10 in a viewfinder showing a single focus point 12 or focus area at the center marked with a cross in accordance with prior art autofocus systems.
  • Fig. 2 schematically illustrates the view 14 in a viewfinder showing a multitude of focus points or focus areas, each marked with a cross, in accordance with prior art autofocus systems.
  • One problem with multiple focus areas is that due to the nature of lenses the areas farthest from the center is subjected to less light that the area at the center. This may cause difficulty for the autofocus system to achieve a sufficiently focused image if the desired object is located in these areas.
  • a central focus area as shown in Fig. 1, is contemplated to provide the best outset for the autofocus system as this area is most likely to have the best light condition.
  • Fig. 3 is illustrated a setup where a photographer uses a camera 16 having a central focus area such as the one illustrated in Fig. 1.
  • the photographer wishes to focus on the face of the person 18.
  • the photographer initially orients the camera 16 so that the face of the person 18 is at the center of the image.
  • the autofocus system accordingly focuses on the face and the photographer holds or locks a first autofocus setting.
  • the locking may be achieved by pressing the trigger halfway down or by operating a separate autofocus button on the camera.
  • the photographer subsequently tilts the camera 16 as illustrated in the right-hand side of the figure so that the image is composed as the photographer desires.
  • the photographer wishes to compose the image so that the entire body of the person 18 is visible in the image 20.
  • the focus plane is parallel with the face of the person when the first autofocus setting was performed. After the photographer has recomposed the image, this focus plane is now moved i.e. tilted relative to the face of the person. The resulting image will accordingly not be focused where the photographer intended.
  • FIG. 5 A similar situation where the photographer pans or swings the camera 16 is illustrated in Fig. 4.
  • FIG. 5 A more detailed illustration is given in Fig. 5 where in the left-hand side the autofocus has focused on the eyes of the person in a first focus setting. It is illustrated that the photographer holds the camera 16 at a horizontal orientation, but the starting point may of course be that the camera 16 is tilted and/or swung relative to the orientation that the photographer intends when recording the desired image.
  • the focus plane 22 is tilted and shifted so as to position the ears of the person 18 in the focus plane instead of the eyes as in the the first focus setting.
  • Fig. 6 illustrates some geometrical relations associated with the shift of focus plane as illustrated above.
  • the photographer has performed the autofocus, left-hand situation to focus at the person's eyes at a first focus plane 22, and subsequently tilts the camera 16, right-hand situation, by an angle ⁇ , and assuming that the person is at a distance, d, from the camera, the first focus plane 22 is shifted by ⁇ to be at 24.
  • the camera comprises a sensor that detects the movement of the camera.
  • the sensor may detect the acceleration and/or tilt and pan of the camera.
  • the angular movement of the camera may be determined on the basis of a signal from the sensor.
  • Sensor types may be any suitable sensor and may be any one of gyroscope, accelerometer, piezo-fiim or piezoelectric sensor, strain-gauge, optical, gravity based measurement devices, or any combinations thereof. In an embodiment the sensor senses change in one direction and in an embodiment the sensor senses change in two directions, and in an embodiment the sensor senses change in three directions.
  • the sensor may be composed of several individual sensors such as accelerometer(s) and gyroscope(s).
  • the camera may include memory for storing orientation information so that change in orientation may be determined.
  • the sensor may provide information regarding the present orientation of the camera or changes of orientation of the camera.
  • the autofocus system integrates respective signals from rate change gyros to detect relative changes in spatial orientation of the camera housing, such as tilts and pans, of the camera between the first focus setting and the second focus setting.
  • This embodiment may additionally comprise accelerometers to detect translational movement or displacement of the camera housing.
  • the senor may be constituted by image recognition software or devices, where the view from the optical lens is analyzed to determine change in orientation or movement of the camera.
  • a lens has a perfectly flat field of sharpness. This means that taking a picture of a flat object will show perfect sharpness all over the entire image area. However, most lenses have a sharpness field that is slightly curved and will not produce images with full sharpness over the entire image area when photographing a flat object. This lens characteristic is called "lens field curvature". With detailed knowledge about the lens design, image position and the aperture used, it is possible to calculate how much the plane of best sharpness deviates from the theoretical flat sharpness plane.
  • Figs. 7 and 8 schematically illustrate an optical lens where the plane of best sharpness 28 bends toward the optical lens. Different optical lens types may have a behavior where the plane 28 bends away from the optica! lens.
  • Fig. 8 illustrates how the focus correction parameter 5 computed above, in connection with refocusing from the first to the second focus setting, is further compensated or corrected with the illustrated distance or value "x".
  • the distance "x" represents a calculated lens field curvature error at this image height which may be computed on basis of a measured camera tilt angle and a measured subject distance.
  • the focus plane 26 is shifted to be at plane 30 by the above-described shift of focus plane in accordance with the computed value of the autofocus correction parameter ⁇ if no account is given to lens field curvature compensation.
  • the true focus piane at the first focus setting lies at the curved plane 28, rather than at plane 26, due to the lens field curvature.
  • the curved plane 28 is subsequently shifted to be located at curved plane 32 in connection with refocusing from the first to the second focus setting as described above.
  • the correction by ⁇ without taking account of lens field curvature causes the curved plane 32 to lie outside the intended focus area (at the person's eyes).
  • Fig. 9 is a schematic illustration of a camera 90.
  • the camera 90 comprises a processor 1 arranged inside a camera housing 91.
  • the processor 1 is electrically connected to three sensors 2, 3 and 4.
  • the sensors may provide information regarding the cameras orientation and/or position and/or motion.
  • the processor may determine the cameras motion or relative motion based on signals from one or more sensors 1, 2 and 3. Based on the sensor signal or signals the processor determines a focus correction parameter for the autofocus system so as to compensate or correct the change in focus caused by a change of spatial orientation of the camera housing 91 as described above.
  • a device 5 such as a motor or linear actuator is configured to move a lens system 6 so as to maintain a desired focus setting at a desired focus plane.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

La présente invention concerne un appareil photo comprenant un boîtier logeant un objectif et un système de mise au point automatique permettant de déterminer un premier réglage de mise au point de l'objectif. Un capteur est conçu pour détecter une modification de l'orientation spatiale du boîtier après la détermination du premier réglage de mise au point et pour produire un signal en fonction de la modification. L'appareil photo comprend un processeur équipé d'une entrée connectée au capteur en vue de la réception du signal provenant du capteur et d'une sortie permettant de commander le système de mise au point automatique. Le processeur est en outre conçu pour déterminer un paramètre de correction de mise au point sur la base du signal provenant du capteur et pour commander le système de mise au point automatique de façon à refaire une mise au point à partir du premier réglage de mise au point vers un deuxième réglage de mise au point en fonction du paramètre de correction de mise au point déterminé. Le paramètre de correction de mise au point comprend la correction de la courbure de champ de l'objectif.
PCT/EP2010/059056 2009-06-26 2010-06-25 Procédé et système de correction de la mise au point d'un appareil photo WO2010149763A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US21363009P 2009-06-26 2009-06-26
US61/213,630 2009-06-26
EP09172680.2 2009-10-09
EP09172680 2009-10-09

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WO2010149763A1 true WO2010149763A1 (fr) 2010-12-29

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2575346A1 (fr) * 2011-09-28 2013-04-03 Apple Inc. Opérations de mise au point automatique dépandentes de l'orientation du dispositif
WO2013098595A1 (fr) * 2011-12-31 2013-07-04 Sony Mobile Communications Ab Module d'appareil photo, dispositif électronique le contenant et procédé de mise au point automatique
WO2015127117A1 (fr) * 2014-02-19 2015-08-27 Nant Holdings Ip, Llc Réduction de dimensions sur la base d'invariants d'éléments de reconnaissance d'objet, systèmes et procédés
WO2016109067A1 (fr) * 2014-12-29 2016-07-07 Intel Corporation Procédé et système de correction du décalage des lentilles pour un ensemble d'appareils de prise de vues
US10419658B1 (en) 2014-07-20 2019-09-17 Promanthan Brains LLC, Series Point only Camera optimizing for several directions of interest
US20220070357A1 (en) * 2020-08-31 2022-03-03 Advanced Micro Devices, Inc. Instant auto-focus with distance estimation

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US5227832A (en) * 1990-11-22 1993-07-13 Asahi Kogaku Kogyo Kabushiki Kaisha Camera system
US20070098380A1 (en) 2005-11-03 2007-05-03 Spielberg Anthony C Systems and methods for improved autofocus in digital imaging systems
US20070122129A1 (en) * 2005-11-25 2007-05-31 Seiko Epson Corporation Image pickup device, method of controlling image pickup device, and recording medium
US20080317453A1 (en) 2007-06-22 2008-12-25 Casio Computer Co., Ltd. Camera apparatus having auto focus function

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US5227832A (en) * 1990-11-22 1993-07-13 Asahi Kogaku Kogyo Kabushiki Kaisha Camera system
US20070098380A1 (en) 2005-11-03 2007-05-03 Spielberg Anthony C Systems and methods for improved autofocus in digital imaging systems
US20070122129A1 (en) * 2005-11-25 2007-05-31 Seiko Epson Corporation Image pickup device, method of controlling image pickup device, and recording medium
US20080317453A1 (en) 2007-06-22 2008-12-25 Casio Computer Co., Ltd. Camera apparatus having auto focus function

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2575346A1 (fr) * 2011-09-28 2013-04-03 Apple Inc. Opérations de mise au point automatique dépandentes de l'orientation du dispositif
WO2013048757A1 (fr) * 2011-09-28 2013-04-04 Apple Inc. Opérations de mise au point automatique qui dépendent de l'orientation du dispositif
US8908083B2 (en) 2011-09-28 2014-12-09 Apple Inc. Dynamic autofocus operations
WO2013098595A1 (fr) * 2011-12-31 2013-07-04 Sony Mobile Communications Ab Module d'appareil photo, dispositif électronique le contenant et procédé de mise au point automatique
CN106462772B (zh) * 2014-02-19 2019-12-13 河谷控股Ip有限责任公司 对象识别特征的基于不变量的维数缩减、系统和方法
US9460366B2 (en) 2014-02-19 2016-10-04 Nant Holdings Ip, Llc Invariant-based dimensional reduction of object recognition features, systems and methods
CN106462772A (zh) * 2014-02-19 2017-02-22 河谷控股Ip有限责任公司 对象识别特征的基于不变量的维数缩减、系统和方法
US9792529B2 (en) 2014-02-19 2017-10-17 Nant Holdings Ip, Llc Invariant-based dimensional reduction of object recognition features, systems and methods
US10410088B2 (en) 2014-02-19 2019-09-10 Nant Holdings Ip, Llc Invariant-based dimensional reduction of object recognition features, systems and methods
WO2015127117A1 (fr) * 2014-02-19 2015-08-27 Nant Holdings Ip, Llc Réduction de dimensions sur la base d'invariants d'éléments de reconnaissance d'objet, systèmes et procédés
US11188786B2 (en) 2014-02-19 2021-11-30 Nant Holdings Ip, Llc Invariant-based dimensional reduction of object recognition features, systems and methods
US10419658B1 (en) 2014-07-20 2019-09-17 Promanthan Brains LLC, Series Point only Camera optimizing for several directions of interest
US11252321B1 (en) 2014-07-20 2022-02-15 Oliver Markus Haynold Method and apparatus for selecting multiple directions of interest
WO2016109067A1 (fr) * 2014-12-29 2016-07-07 Intel Corporation Procédé et système de correction du décalage des lentilles pour un ensemble d'appareils de prise de vues
US9628695B2 (en) 2014-12-29 2017-04-18 Intel Corporation Method and system of lens shift correction for a camera array
US20220070357A1 (en) * 2020-08-31 2022-03-03 Advanced Micro Devices, Inc. Instant auto-focus with distance estimation
US11902658B2 (en) * 2020-08-31 2024-02-13 Advanced Micro Devices, Inc. Instant auto-focus with distance estimation

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