EP2606636A1 - Dispositif d'assistance à la mise au point d'une caméra - Google Patents

Dispositif d'assistance à la mise au point d'une caméra

Info

Publication number
EP2606636A1
EP2606636A1 EP11745960.2A EP11745960A EP2606636A1 EP 2606636 A1 EP2606636 A1 EP 2606636A1 EP 11745960 A EP11745960 A EP 11745960A EP 2606636 A1 EP2606636 A1 EP 2606636A1
Authority
EP
European Patent Office
Prior art keywords
camera
focus
focusing
information
determining
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP11745960.2A
Other languages
German (de)
English (en)
Inventor
Holger Fillbrandt
Jan Karl Warzelhan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2606636A1 publication Critical patent/EP2606636A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing
    • G03B3/12—Power-operated focusing adapted for remote control
    • 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

Definitions

  • the present invention relates to a device for assisting focusing of a camera equipped with a manual focus adjustment device for providing digital image contents, in particular a smart camera, a camera equipped with such a device, and a method for providing focusing information.
  • Smart cameras are understood as optical systems that not only capture images, but also process and / or interpret them themselves. For example, as an intelligent and autonomous optical system, a smart camera can filter and process application-specific information from recorded images in addition to an image acquisition circuit and make decisions based on these.
  • Smart cameras which are commonly used in surveillance tasks, typically consist of a camera body with a video processing unit (Video Processing) and a detachable lens. Depending on the application, different lenses (wide-angle, telephoto or zoom lenses) can be used. After mounting a new lens, it usually has to be focused manually. In the case of a smart camera, this is usually connected via a network connection, for example via Ethernet or WLAN, to a computer (eg a notebook). Then, the camera image on the notebook can be viewed while the lens is set to the best focus.
  • a network connection for example via Ethernet or WLAN
  • a computer eg a notebook
  • a usable in such smart cameras focusing device or a taking lens with a variable focal length is disclosed for example in DE 23 61 286 A1.
  • Automatic methods for motorized focusing of a lens are, for example, from
  • the present invention proposes a device for assisting focusing of a camera equipped with a manual focus adjustment device for providing digital image contents, in particular a smart camera, a camera equipped with such a device. and a method for providing focusing information for focusing such a camera with the features of the independent patent claims.
  • Advantageous embodiments are the subject of the dependent claims and the following description.
  • a present in the smart camera microprocessor is used to analyze the sharpness of the image.
  • one or more light emitting diodes on the camera signal the status of the focus adjustment process and provide feedback to a user regarding a focus position.
  • an acoustic signaling or a large-area visualization can take place directly in the camera image, so that even in the case of a remotely located notebook (eg, in the context of a conventional camera setting method) the sharpness status of the camera can be recognized. In the latter case is to be regarded as advantageous that in this case no additional hardware is needed, but then an external image display is still required.
  • a microprocessor usually operates, which analyzes the video data provided by the camera and extracts further information (eg as part of a motion detection). This microprocessor is used during a focusing process to check the focus of the camera image.
  • suitable image processing routines are implemented on the smart camera, as further explained below.
  • the corresponding algorithms or processing routines require only small storage and computing capacities on the smart camera and, as far as they are not only loaded in installation mode (ie for setting a corresponding camera under special conditions), can also be used for other applications.
  • the results of an analysis performed by the microprocessor are signaled by light emitting diodes, as mentioned, on the housing and / or acoustically in the housing and / or written in the form of an on-screen functionality on a camera image or displayed in this.
  • a significant advantage of the proposed measures according to the invention is a simplification of a focusing process, in order to ensure a precise adjustment of the lens, regardless of the limited display options.
  • Figure 1 shows a smart camera, as used in the present invention.
  • FIG. 2 shows means for displaying focusing information according to a particularly preferred embodiment of the invention.
  • Figures 3A to 3E show steps of focusing according to a particularly preferred embodiment of the invention.
  • Embodiment (s) of the invention
  • FIG. 1 shows a smart camera as can be used in the context of a method according to the invention.
  • the camera has a camera body 10 and an objective 11.
  • the camera is connected via an unillustrated connection means, which may also be in the form of a WLAN device or other wireless transmission devices, to an external evaluation and / or display device (also not shown).
  • a corresponding camera usually has a einstellrad 11 1, which is used to adjust the camera focus, via an iris diaphragm setting 1 12 and a setting device for changing a focal length 113 (zoom setting).
  • FIG. 2 shows means for displaying focusing information according to a particularly preferred embodiment of the invention and designated 201 to 204 in four different display states, corresponding to focusing information.
  • Corresponding display means for example, each with light emitting diodes
  • LED deposited transparent areas 210, 220, 230 on.
  • a switched-off state 201 none of the displays 210, 220, 230 are illuminated.
  • the user is signaled by illuminating an arrow (hatched in the figure) that a focus wheel 11 1 of a corresponding camera (see FIG ) in a first direction, for example to the right, must be rotated. If, on the basis of the means for determining the focus value provided according to the invention, it is recognized that rotation of the focus wheel in the opposite direction is required, this is signaled to the user in the display state 203 by illumination of an opposing arrow 210.
  • a sharpness value is reached, for example above an automatically gradually increased threshold value, this is indicated to the user here by lighting up a rectangle 220.
  • This provides a cost-effective signal output device in the form of one or more light-emitting diodes, which can also be supported and / or replaced by an acoustic signal generator.
  • a corresponding on-screen visualization can be made.
  • Visual signaling as shown in FIG. 2, can also be simplified by omitting the "directional arrows" 210, 230 or by employing only a "turning arrow” indicating a required rotation in the opposite direction. The sequence of a preferred focusing will be described below with reference to the figures shown in FIGS. 3A to 3E.
  • the focusing process corresponds to the intuitive, iterative process which a user would also use with a visible camera image.
  • the focus ring is moved beyond the area of maximum sharpness, with the extent of this area in each
  • Step further refined d. H. the threshold at which the image is recognized as "sharp" increases.
  • Means for determining a focus value use, for example, a gradient calculation on the input image (see respective sub-figures 1 of FIGS. 3A-3E), wherein the sum over the absolute values of the gradients is used for the analysis.
  • a focus recognition system can be used, as described in WO 2008/063811 A1, in which a sharpness value is converted into a wave form.
  • FIG. 3A shows a situation in which a focus adjustment is on the left stop.
  • a focus adjustment is on the left stop.
  • Such a setting has the user z. B. at the beginning of the installation or the camera automatically moves to such a position.
  • the installation process for focusing can be initiated for example by means of a physical switch on the camera or by software command to the camera.
  • the control display in this state corresponds to the display state 202 of Figure 2.
  • the (fuzzy) camera image obtained in this state is shown.
  • the Sub-figure 2 shows a gradient image in which the edges that occur in the sub-figure 1, are implemented accordingly. Due to the blurring of the resulting image no edges are detectable.
  • sub-figure 3 the sum of the gradient amounts from the edge image 2 is plotted on a y-axis over time or at a respective sampling time on the x-axis, thereby obtaining a quality measure of sharpness for each set timing.
  • the means for displaying the focus information switch to a display state 203, which is signaled that a focus wheel in an opposite direction, in this case, to the left, to be moved.
  • a first coarse threshold of sharpness is set (eg, 3/4 of the maximum). If the focus distance is above this threshold range, the display lights up in display state 204.
  • a fitter can recognize directly on a camera (eg by means of a light-emitting diode), when this is optimally adjusted. This allows the camera tuning, z. B. on a ladder at a greater distance, are made without z. For example, it may be necessary to inspect a display on a notebook that is conventionally used for a shot.
  • acoustic signaling can be incorporated into the described installation process and support or replace it. This can be done for example by means of variable pitches, tone sequences and / or sound intervals. A constant tone can z. B. signal an optimum and faster tone sequences can indicate a destination guidance in the direction of optimum or slower tone sequences leaving the optimum.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)

Abstract

La présente invention concerne un dispositif d'assistance à la mise au point d'une caméra équipée d'un système de réglage de mise au point manuel pour fournir des contenus d'images numériques, en particulier une caméra intelligente, le dispositif comportant des moyens de détermination d'une valeur de mise au point de la caméra en fonction d'une utilisation du système de réglage de mise au point manuel et des moyens pour afficher à destination d'un utilisateur des informations de mise au point sur la base de la valeur de mise au point déterminée.
EP11745960.2A 2010-08-18 2011-08-15 Dispositif d'assistance à la mise au point d'une caméra Withdrawn EP2606636A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010039431A DE102010039431A1 (de) 2010-08-18 2010-08-18 Vorrichtung zur Unterstützung einer Fokussierung einer Kamera
PCT/EP2011/064029 WO2012022713A1 (fr) 2010-08-18 2011-08-15 Dispositif d'assistance à la mise au point d'une caméra

Publications (1)

Publication Number Publication Date
EP2606636A1 true EP2606636A1 (fr) 2013-06-26

Family

ID=44503838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11745960.2A Withdrawn EP2606636A1 (fr) 2010-08-18 2011-08-15 Dispositif d'assistance à la mise au point d'une caméra

Country Status (5)

Country Link
US (1) US9148559B2 (fr)
EP (1) EP2606636A1 (fr)
CN (1) CN103168461B (fr)
DE (1) DE102010039431A1 (fr)
WO (1) WO2012022713A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140091959A (ko) * 2013-01-14 2014-07-23 삼성전자주식회사 초점상태 표시장치
DE102013224704A1 (de) 2013-12-03 2015-06-03 Robert Bosch Gmbh Verfahren zur automatischen Fokussierung einer Kamera
US9918006B2 (en) 2016-05-20 2018-03-13 International Business Machines Corporation Device, system and method for cognitive image capture
CN106341594A (zh) * 2016-08-23 2017-01-18 上海集光安防科技股份有限公司 一种摄像机辅助聚焦的方法
DE102017221474A1 (de) 2017-11-29 2019-05-29 Robert Bosch Gmbh Überwachungsmodul, Überwachungsmodulanordnung, Überwachungsanlage und Verfahren
US11122198B2 (en) 2020-01-07 2021-09-14 International Business Machines Corporation Adjusting image capture parameters via machine learning

Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2002072332A (ja) * 2000-09-04 2002-03-12 Fuji Photo Film Co Ltd カメラの合焦情報表示装置及びその方法

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DE2361286A1 (de) 1973-12-08 1975-06-12 Bosch Gmbh Robert Aufnahmeobjektiv mit veraenderbarer brennweite
JPH0625844B2 (ja) * 1983-05-26 1994-04-06 キヤノン株式会社 カメラ
FR2675330B1 (fr) 1991-04-11 1995-12-15 Telediffusion Fse Une methode et un systeme pour la mise au point automatique d'une camera utilisant la tcd.
US6937284B1 (en) * 2001-03-20 2005-08-30 Microsoft Corporation Focusing aid for camera
JP3530907B2 (ja) * 2002-01-31 2004-05-24 ミノルタ株式会社 デジタルカメラ
JP4325599B2 (ja) * 2005-08-25 2009-09-02 ソニー株式会社 撮像装置および表示制御方法
EP1954031A4 (fr) * 2005-10-28 2010-09-29 Nikon Corp Dispositif d'imagerie, dispositif de traitement d'image et programme
US7544919B2 (en) 2006-11-20 2009-06-09 Red.Com, Inc. Focus assist system and method
GB2457867B (en) 2007-10-08 2010-11-03 Keymed Electronic camera
JP5025532B2 (ja) * 2008-03-12 2012-09-12 キヤノン株式会社 撮影装置、撮像装置の制御方法及び撮像装置の制御プログラム

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2002072332A (ja) * 2000-09-04 2002-03-12 Fuji Photo Film Co Ltd カメラの合焦情報表示装置及びその方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2012022713A1 *

Also Published As

Publication number Publication date
DE102010039431A1 (de) 2012-02-23
US9148559B2 (en) 2015-09-29
US20130235254A1 (en) 2013-09-12
CN103168461B (zh) 2017-01-18
WO2012022713A1 (fr) 2012-02-23
CN103168461A (zh) 2013-06-19

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