WO2005033764A1 - 撮影レンズ位置制御装置 - Google Patents
撮影レンズ位置制御装置 Download PDFInfo
- Publication number
- WO2005033764A1 WO2005033764A1 PCT/JP2004/012828 JP2004012828W WO2005033764A1 WO 2005033764 A1 WO2005033764 A1 WO 2005033764A1 JP 2004012828 W JP2004012828 W JP 2004012828W WO 2005033764 A1 WO2005033764 A1 WO 2005033764A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- video signal
- lens position
- unit
- control device
- position control
- Prior art date
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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
- G02B7/28—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
-
- 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
-
- 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
-
- 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
- the present invention relates to determination and control of a focus lens position of a camera.
- a camera is equipped with a function of automatically focusing on a subject at the time of shooting, a so-called auto focus function.
- One of the autofocus methods is a "contrast detection method", which considers the "in-focus state” to be the "contrast-clear state”.
- this method there is a method disclosed in Patent Document 1. According to the technology disclosed herein, the position of the focus lens is moved every frame (one field), and contrast data of one frame is acquired as a focus determination value for each position. Then, the focus lens position is determined from the focus determination value.
- Patent Document 1 Japanese Patent No. 2523011
- the focus determination value of one lens position is acquired for each frame.
- the focus determination value at a certain lens position is obtained by scanning an image within one frame at that lens position to obtain a video signal that is the basis of contrast data, and the processing is performed for each lens position. It will be performed at Therefore, there is a problem that it takes time to determine the focus lens position where the subject is in focus. For this reason, digital cameras that frequently use this contrast detection method may miss an instant photo opportunity.
- a video signal acquisition unit for acquiring a video signal, and a focus lens during an acquisition period during which the video signal acquisition unit is acquiring a video signal.
- a photographing lens position control device including a holding unit and a photographing lens position determining unit that determines a photographing lens position that is a focus lens position for photographing based on a position-dependent video signal.
- the “focus lens” refers to a lens that moves its position in a camera to focus on a subject.
- the “focus lens position” refers to the position of the focus lens in the photographing mechanism of the photographing device.
- the focus lens is moved while the video signal is being acquired, so that the time for acquiring the video signal for determining the position of the imaging lens is longer than before. This has the effect of being shortened. Therefore, a momentary photo opportunity can be more reliably captured.
- the camera of the present invention includes not only a camera for photographing a still image but also a general photographing apparatus for focusing using a lens, such as a video camera for photographing a moving image.
- Embodiment 2 mainly describes claims 5, 6, and 7.
- Example 1 (Concept of Example 1)
- Example 1 describes an image pickup method in which a focus lens is determined by moving a focus lens while acquiring a video signal. This is a shadow lens position control device.
- a configuration of the photographing lens position control device will be described.
- FIG. 1 is a diagram showing functional blocks of a photographic lens position control device of the present embodiment.
- the “photographing lens position control device” (0100) of this embodiment includes a “video signal acquisition unit” (0101), a “focus lens moving unit” (0102), and a “holding unit”. (0103) and a “photographing lens position determination unit” (0104).
- the "video signal acquisition unit” (0101) has a function of acquiring a video signal.
- the “video signal” is a signal that indicates the color and brightness generated by camera devices such as a CCD, CMOS imager, and color filter that convert the intensity of light captured by the lens into an electrical signal.
- This video signal includes, for example, a luminance signal (Y), a YUV signal which is a signal representing a color with three pieces of information of a difference between the luminance signal and the red component (U), and a difference between the luminance signal and the blue component (V).
- RGB signals expressing the colors as a combination of the three primary colors of red (R), green (G), and blue (B), and complementary colors Cyan (indigo), Magenta (red), Yellow (yellow), Green ( CMYG signals indicating the four colors (green).
- the image signal is acquired by the video signal acquiring unit by using a device such as a CCD or a CMOS imager as described above, and a photodiode or the like measures the intensity of light at each pixel of the subject to luminance. This is performed by converting the video signal into a video signal such as a signal (Y) and acquiring it.
- the "focus lens moving unit” (0102) has a function of moving the focus lens during the acquisition period.
- the “acquisition period” refers to a period during which the video signal acquiring unit (0101) is acquiring a video signal, and includes, for example, a period for acquiring a video signal for one frame.
- FIG. 2 is a diagram for explaining the relationship between the video signal acquisition unit and the focus lens moving unit. As shown in this figure, the image acquired by the CCD or CMOS imager is scanned as indicated by the arrow, and the image signal of each pixel (from pixel 0 to pixel 1000 in the figure) is acquired by the image signal acquisition unit. .
- the movement of the focus lens at the time of acquiring the video signal is an intermittent movement, and the acquisition of the video signal may be performed when the intermittently moving focus lens is in a stopped state.
- “Intermittent movement” means that the moving state and the stopped state are alternately repeated at predetermined intervals.
- FIG. 3 is a diagram for explaining the relationship between the video signal acquiring unit and the focus lens moving unit when performing the intermittent movement. As shown in this figure, first, when the focus lens is at the position ⁇ , scanning is performed on the portion indicated by the arrow (1) to obtain a video signal. Then the focus lens is moved. During that movement, the portion indicated by the arrow (2) is scanned.
- the acquisition of the position-dependent video signal by the intermittent movement can be rephrased as a case where the number of processes of acquiring the position-dependent video signal is larger than the number of the frames. That is, there may be a form in which three position-dependent video signals are acquired between two frames.
- the focus lens moving unit may be, for example, an in-body moving device built in a camera body (main body) or an in-lens moving device mounted in an interchangeable lens. good.
- the moving device can be realized by, for example, a DC motor having a simple drive circuit, an ultrasonic motor that converts vibration into rotational force, and a control circuit such as a microprocessor that controls the number of rotations of the motor.
- the “holding unit” (0103) has a function of holding a position-dependent video signal.
- “Position-dependent video signal” refers to information that associates the video signal acquired by the video signal acquisition unit (0101) with the focus lens position moved by the focus lens movement unit (0102).
- the video signal is a signal represented by, for example, a luminance signal ( ⁇ ), an RGB signal, a CMYG signal, and the like
- the focus lens position is, for example, the number of motor pulses or the number of rotations or the actual movement of the lens.
- Information represented by a numerical value such as a distance is included.
- This holding unit can be realized by a storage medium such as a memory, for example.
- the “photographing lens position determining unit” (0104) has a function of determining a photographing lens position that is a focus lens position for photographing based on the position-dependent video signal held in the holding unit (0103).
- FIG. 4 is a diagram for explaining the determination of the photographic lens position by the photographic lens position determination unit.
- the peak of the peak may be used, or the peak before (the lens in front of the subject is in focus) may be used. It is OK to determine the focus lens position. Note that a method of acquiring contrast data from a video signal will be described later in the mounting of a camera device.
- FIG. 5 shows an example of a device configuration when the photographing lens position control device of the present embodiment is mounted on a camera.
- the “video signal acquisition unit” of the configuration requirement described above is realized by “CCD” (0502) in FIG.
- the video signal is acquired by the CCD while the focus lens is moved or intermittently moved by the “driving device” (0508) that is the “focus lens moving unit”.
- the video signal is associated with the focus lens position, and held as a position-dependent video signal in a “memory” (not shown) that is a “holding unit”.
- the contrast data is calculated by the processing in.
- FIG. 6 is a diagram for explaining the acquisition of contrast data (focusing determination value) necessary for determining the photographing lens position in the above-described apparatus configuration example.
- This figure shows a method of Fourier transforming and processing a luminance signal of a pixel as a frequency component.
- a luminance signal which is a video signal
- the CCD is acquired by a CCD (0502) from video light that has passed through a “focus lens” (0501).
- the video signal and luminance signal obtained by the CCD are extracted as frequency components by the “frequency extraction circuit” (0503) (shown as 1 in FIG. 6; the same applies hereinafter).
- the frequency component of the luminance signal is Fourier-transformed by the “Fourier transform circuit” (0504) (2).
- the Fourier-transformed luminance signal is passed through a “band-pass filter” (0505) (3) to extract a high-frequency component of the frequency component, that is, a part that becomes a contrast (4). Then, in the “range integral value calculation circuit” (0506), the integral value of the extracted range (vertical line portion) serving as contrast data is obtained (5), and the integral value is plotted as contrast data in association with the lens position. (6).
- the photographing lens position is determined using the contrast data calculated as described above.
- the acquisition of the video signal is performed while the focus lens is moved or intermittently moved by the "driving device". Therefore, it is possible to perform the acquisition processing earlier than before. Therefore, the final determination process of the photographing lens position can be performed earlier than before.
- a luminance signal is used as a video signal. This is because the luminance signal is considered to be a signal in which the peak of the integrated value appears most frequently.
- a color signal represented by RGB or a CMYG signal may be used as the video signal.
- CMYG 7 is a diagram for explaining CMYG signals.
- Cyan (indigo) is Blue-Green
- Magenta (red) is Red-Blue
- Yellow (yellow) is Green-Red.
- the combined power of the four CMY colors plus Green is subtracted (subtracted) from each color, and RGB can be harmed.
- Red Yellow—Green
- Complementary color CCDs that acquire this CMYG signal have good sensitivity to light and are widely used in digital cameras that value sensitivity. Therefore, in the present invention, this CMYG signal is obtained as a video signal. Going, deciding on it.
- FIG. 8 is a flowchart illustrating an example of a processing flow of the present embodiment.
- the following process flow can be implemented as a method, a program to be executed by a computer, or a readable recording medium on which the program is recorded.
- the movement of the focus lens is started (step S0801).
- acquisition of a video signal is started (step S0802).
- a position-dependent video signal which is information relating the video signal acquired in step S0802 and the focus lens position moved in step S0801, is held (step S0803).
- the movement of the focus lens started in step S0801 is terminated (step S0804).
- the acquisition of the video signal started in step S0802 ends (step S0805).
- the photographic lens position is determined based on the position-dependent video signal held in step S0803 (step S0806).
- the video signal acquisition unit of the photographing lens control device of the present embodiment has a vertical scanning unit, and acquires a video signal by vertically scanning an image sensor arranged in a vertical and horizontal matrix.
- the video signal acquisition unit of the photographing lens control device of the present embodiment has a vertical scanning unit, and acquires a video signal by vertically scanning an image sensor arranged in a vertical and horizontal matrix.
- it has a horizontal scanning means, and obtains a video signal by scanning the imaging devices arranged in a vertical and horizontal matrix in the horizontal direction.
- the basic configuration of the second embodiment is the same as that of the photographic lens control device described in the first embodiment, and a description thereof will not be repeated.
- the feature point is that the video signal acquisition unit has “vertical scanning means” or “horizontal scanning means”.
- FIG. 9 is a diagram for explaining the scanning method according to the present embodiment.
- the peak of the contrast data cannot be detected as shown in the graph.
- scanning is performed while moving the lens. If there is an object (airplane) having a strong edge component near the scanning start point, that is, near the movement start point of the focus lens, the image is not yet focused. Therefore, strong contrast data may not be calculated. Then, since there is almost no edge component in the sky and clouds thereafter, strong contrast data cannot be calculated. Therefore, in the present embodiment, as shown in FIG. 10, there is provided a vertical scanning means for vertically scanning the image pickup devices arranged in a vertical and horizontal matrix. Thus, even in the case described above, it is possible to calculate contrast data having strong peaks.
- FIG. 11 is a diagram for explaining another scanning method according to the present embodiment.
- FIG. 11 (1) for example, when a rocket is shown on the left side of the blue sky. Contrary to the above example, if the vertical scan is performed, the contrast data will be similarly good. May not be detected. Therefore, another example of the present embodiment includes a vertical scanning unit that scans the imaging devices arranged in a vertical and horizontal matrix as shown in (2) of FIG. 11 in the vertical direction. Thus, even in the case described above, it is possible to calculate contrast data having a strong peak.
- the photographing lens control device described in the first embodiment has a vertical scanning unit or a horizontal scanning unit, so that it can cope with a wide variety of situations. To focus on the subject.
- the imaging lens control device may further include both a vertical scanning unit and a horizontal scanning unit. Further, a scanning direction switching means for switching between the vertical scanning means and the horizontal scanning means may be provided. This “scan direction switching means” may be realized by a device that switches according to the photographer's intention, such as pressing a switch. Further, if the peak of the contrast data cannot be detected well (for example, the absolute value of the change from the plus to the minus of the slope is smaller than a predetermined value), it may be realized by a device that automatically switches. ,.
- the scanning by the horizontal scanning means is executed by the scanning direction switching means, and even if the photographing lens position is determined from the contrast data based on both the vertical and horizontal scanning results. good. [0033] This makes it possible to focus on the subject in response to a wider variety of situations.
- FIG. 1 is a diagram illustrating an example of functional blocks of a photographing lens control device according to a first embodiment.
- FIG. 2 is a diagram for explaining a relationship between a video signal acquisition unit and a focus lens moving unit of the photographing lens position control device according to the first embodiment.
- FIG. 3 is a diagram for explaining the relationship between the video signal acquisition unit and the focus lens moving unit in the case of intermittent movement of the photographing lens position control device according to the first embodiment.
- FIG. 4 is a diagram for explaining the determination of the photographing lens position in the photographing lens position determining unit of the photographing lens position control device according to the first embodiment.
- FIG. 5 An example of a device configuration when the photographing lens position control device of the first embodiment is mounted on a camera.
- FIG. 6 Explanation of acquisition of contrast data necessary for determining a photographing lens position in the device configuration example of the first embodiment.
- FIG. 7 is a diagram for explaining a CMYG signal, which is a video signal acquired by a video signal acquisition unit of the photographing lens position control device of the first embodiment.
- FIG. 8 is a flowchart illustrating an example of a processing flow in the photographing lens position control device according to the first embodiment.
- FIG. 9 is a view for explaining a scanning method of the photographing lens position control device according to the second embodiment.
- FIG. 10 is a diagram for explaining a scanning method of the photographing lens position control device of the second embodiment.
- FIG. 11 is a diagram for explaining another scanning method of the photographing lens position control device of the second embodiment.
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- Optics & Photonics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Multimedia (AREA)
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/576,764 US20080037972A1 (en) | 2003-09-22 | 2004-09-03 | Photographing Lens Position Control Device |
JP2005514374A JPWO2005033764A1 (ja) | 2003-09-22 | 2004-09-03 | 撮影レンズ位置制御装置 |
EP04772777A EP1669788A4 (en) | 2003-09-22 | 2004-09-03 | POSITION CONTROL DEVICE FOR A PHOTOGRAPHIC LENS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-329457 | 2003-09-22 | ||
JP2003329457 | 2003-09-22 |
Publications (1)
Publication Number | Publication Date |
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WO2005033764A1 true WO2005033764A1 (ja) | 2005-04-14 |
Family
ID=34418998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/012828 WO2005033764A1 (ja) | 2003-09-22 | 2004-09-03 | 撮影レンズ位置制御装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080037972A1 (ja) |
EP (1) | EP1669788A4 (ja) |
JP (1) | JPWO2005033764A1 (ja) |
KR (1) | KR20060058117A (ja) |
CN (1) | CN1856724A (ja) |
WO (1) | WO2005033764A1 (ja) |
Cited By (6)
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JP2009194469A (ja) * | 2008-02-12 | 2009-08-27 | Ricoh Co Ltd | 撮像装置 |
JP2010256444A (ja) * | 2009-04-22 | 2010-11-11 | Casio Computer Co Ltd | 焦点調整装置、焦点調整方法及びプログラム |
US7945151B2 (en) | 2005-06-29 | 2011-05-17 | Canon Kabushiki Kaisha | Focus control method and unit determining in-focus lens position based on read times of the autofocus areas and focus lens position and time |
JP2016102953A (ja) * | 2014-11-28 | 2016-06-02 | 株式会社ニコン | 焦点検出装置およびカメラ |
JP2019148817A (ja) * | 2019-04-22 | 2019-09-05 | 株式会社ニコン | 合焦状態検出装置およびカメラ |
JP2021051322A (ja) * | 2020-12-09 | 2021-04-01 | 株式会社ニコン | 合焦状態検出装置およびカメラ |
Families Citing this family (2)
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JP5546166B2 (ja) * | 2009-06-19 | 2014-07-09 | キヤノン株式会社 | 撮像装置、信号処理方法、及びプログラム |
US10033917B1 (en) * | 2015-11-13 | 2018-07-24 | Apple Inc. | Dynamic optical shift/tilt lens |
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US7945151B2 (en) | 2005-06-29 | 2011-05-17 | Canon Kabushiki Kaisha | Focus control method and unit determining in-focus lens position based on read times of the autofocus areas and focus lens position and time |
JP2009194469A (ja) * | 2008-02-12 | 2009-08-27 | Ricoh Co Ltd | 撮像装置 |
JP2010256444A (ja) * | 2009-04-22 | 2010-11-11 | Casio Computer Co Ltd | 焦点調整装置、焦点調整方法及びプログラム |
JP2016102953A (ja) * | 2014-11-28 | 2016-06-02 | 株式会社ニコン | 焦点検出装置およびカメラ |
JP2019148817A (ja) * | 2019-04-22 | 2019-09-05 | 株式会社ニコン | 合焦状態検出装置およびカメラ |
JP2021051322A (ja) * | 2020-12-09 | 2021-04-01 | 株式会社ニコン | 合焦状態検出装置およびカメラ |
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EP1669788A1 (en) | 2006-06-14 |
CN1856724A (zh) | 2006-11-01 |
US20080037972A1 (en) | 2008-02-14 |
KR20060058117A (ko) | 2006-05-29 |
JPWO2005033764A1 (ja) | 2007-11-15 |
EP1669788A4 (en) | 2011-10-19 |
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