WO2007058099A1 - Dispositif d'imagerie - Google Patents

Dispositif d'imagerie Download PDF

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Publication number
WO2007058099A1
WO2007058099A1 PCT/JP2006/322264 JP2006322264W WO2007058099A1 WO 2007058099 A1 WO2007058099 A1 WO 2007058099A1 JP 2006322264 W JP2006322264 W JP 2006322264W WO 2007058099 A1 WO2007058099 A1 WO 2007058099A1
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WIPO (PCT)
Prior art keywords
subject
luminance information
calculation unit
condition
type
Prior art date
Application number
PCT/JP2006/322264
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English (en)
Japanese (ja)
Inventor
Akikazu Yachi
Satoko Furuki
Toru Matsuzawa
Nobuyuki Watanabe
Original Assignee
Olympus Corporation
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.)
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Application filed by Olympus Corporation filed Critical Olympus Corporation
Publication of WO2007058099A1 publication Critical patent/WO2007058099A1/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
    • 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

Definitions

  • the present invention relates to an imaging apparatus using a focus detection apparatus using a Depth From Defocus (hereinafter abbreviated as DFD) method for detecting focus even with a plurality of image forces having different blurs.
  • DFD Depth From Defocus
  • US Pat. No. 4,965,840 discloses a focus detection method called a DFD method.
  • luminance information is acquired at two locations with different optical path lengths.
  • a blur parameter is calculated by performing arithmetic processing on a plurality of images having different blurs, and in-focus determination is performed.
  • the blur parameter is a representative value indicating the blur state of the luminance information, and indicates a value correlated with the dispersion value of the point spread function (PSF) of the optical system.
  • PSF is a function that expresses how light rays spread when an ideal point image passes through the optical system.
  • the DFD method at least two focus determination brightness information from the same subject, the same part, and the same line-of-sight direction are changed, and at least one shooting parameter that affects the blurred state of the captured image is changed.
  • the shooting parameters include focus lens position, aperture amount, focal length, and the like. In this description, the description is limited to the case where only the position of the focus lens is changed.
  • the focus lens is moved to the predetermined first position and second position. Then, the first luminance information is acquired at the first position, and the second luminance information is acquired at the second position.
  • the acquired luminance information includes low-pass filter processing for removing electrical noise, image magnification correction processing for correcting different magnifications between the first and second images, luminance distribution, and the like. Which regular processing is applied. If necessary, select the area to be focused in the acquired luminance information.
  • the selection is performed on one of the luminance information, and the corresponding area is selected on the other luminance information. Then, the difference between the first luminance information and the second luminance information is calculated from the two normal tig processing results in the region where the focus determination is to be performed. In addition, the second derivative of each of the first luminance information and the second luminance information is calculated, and the average value thereof is calculated. Then, by dividing the difference between the first luminance information and the second luminance information by the average value of the second derivative of the luminance information, the variance of the PSF corresponding to the first or second luminance information can be obtained. A correlated blur parameter is calculated.
  • the subject distance is obtained based on the relational expression between the dispersion of the PSF and the subject distance described in US Pat. No. 4,965,840.
  • the subject distance can be obtained with high accuracy when the in-focus lens position exists in the vicinity of the two lens positions when the luminance information is acquired.
  • the focus detection accuracy deteriorates as the two lens positions move away from the focusing lens.
  • the present invention has been made in view of the above points, and an object thereof is to provide an imaging apparatus capable of accurately performing focus detection.
  • One aspect of the imaging apparatus of the present invention is an imaging apparatus that captures an image of a subject and records an image of the subject.
  • Luminance information acquisition means for photographing by acquiring luminance information of light imaged by the optical system
  • a blur parameter calculation unit that calculates a blur parameter corresponding to a distance from the optical system to the subject using a plurality of pieces of luminance information with different blurs acquired by the luminance information acquisition unit;
  • An arrangement determining means for determining an arrangement of the optical system or the luminance information acquiring means based on the blur parameter calculated using the blur parameter calculating means;
  • Subject determination means for determining the type of subject
  • Condition calculating means for calculating shooting conditions when shooting by the brightness information acquiring means according to a determination result by the subject determining means;
  • FIG. 1 is a diagram showing a configuration of a compact camera as an imaging apparatus according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram of the compact camera shown in FIG.
  • FIG. 3 is a flowchart for explaining the processing of the compact camera of FIG. 2.
  • FIG. 4 is a diagram showing a relationship between a blur parameter and a focus lens position.
  • FIG. 5 is a diagram showing a configuration of a single-lens reflex camera as an imaging apparatus according to a first modification of the first embodiment of the present invention.
  • FIG. 6 is a block diagram of the single-lens reflex camera of FIG.
  • FIG. 7 is a diagram showing a flowchart for explaining processing of the single-lens reflex camera of FIG. 6.
  • FIG. 8 is a block configuration diagram of a compact camera as an imaging device according to a second modification of the first embodiment of the present invention.
  • FIG. 9 is a flowchart for explaining the process of the compact camera of FIG. 8.
  • FIG. 10 is a block diagram of a compact camera as an image pickup apparatus according to the second embodiment of the present invention.
  • FIG. 11 is a diagram showing a flowchart for explaining the processing of the compact camera shown in FIG.
  • FIG. 12 is a block diagram of a compact camera as an image pickup apparatus according to a modification of the second embodiment of the present invention.
  • FIG. 13 is a diagram showing a flowchart for explaining the processing of the compact camera of FIG.
  • the imaging apparatus is a compact camera 10 as shown in FIG.
  • the compact camera 10 includes an optical system 12, an image sensor 14, a luminance signal control unit 16, a subject determination unit 18, a luminance information acquisition position calculation unit 20, a photometric sensor 22, and an exposure condition calculation unit 24. , An optical system control unit 26, and a distance estimation calculation unit 28.
  • the optical system 12 includes a plurality of lens groups and an aperture, and is a lens group (taking lens) for the purpose of taking an image. Some of these lens groups can be driven in the optical axis direction to adjust the focus. This lens group is called a focus lens.
  • the image of the subject formed by the taking lens is converted into an electric signal by the photoelectric conversion element of the imaging element 14.
  • the converted electrical signal is converted into a digital signal by the luminance signal control unit 16.
  • the digital signal converted by the luminance signal control unit 16 is called luminance information. That is, the image sensor 14 and the luminance signal control unit 16 constitute a luminance information acquisition unit 30.
  • the luminance information acquired by the luminance information acquisition unit 30 is input to the distance estimation calculation unit 28.
  • the subject determining unit 18 is a user interface for determining the type of subject, and the photographer selects the type of subject that the photographer intends to photograph through this user interface. You can select at least five different types of subjects: close-up subjects, distant subjects, people, night-view subjects, and standard subjects.
  • the setting of the shooting condition is influenced by the type of subject selected by the subject determining unit 18.
  • the luminance information acquisition position calculation unit 20 that functions as a condition calculation unit calculates an optimum focus lens position for performing focus detection according to the type of the subject selected by the subject determination unit 18.
  • the photometric sensor 22 senses incident light from the subject.
  • the condition calculation unit 24 calculates the shirt speed of the image sensor 14 from the measurement result of the photometric sensor 22.
  • the optical system control unit 26 functioning as the condition setting means is configured by an actuator and a drive circuit for driving the actuator, although not shown in particular.
  • the position of the focus lens and the diameter of the aperture in the optical system 12 are configured. To control.
  • the distance estimation calculation unit 28 estimates the subject distance by the DFD method.
  • the distance estimation calculation unit 28 includes a blur parameter calculation unit 32, a control parameter calculation unit 34, and an LUT storage unit 36.
  • the blur parameter calculation unit 32 includes a difference calculation unit 38, a secondary differential calculation unit 40, a blur parameter calculation unit 42, and a buffer 44.
  • the difference calculation unit 38 calculates a difference between images necessary for calculating the blur parameter.
  • the second derivative calculation unit 40 calculates the second derivative of the image, and calculates the average of the second derivative results obtained from a plurality of (for example, two) luminance information powers with different blurs.
  • the blur parameter calculation unit 42 calculates the blur parameter by dividing the average of the image difference calculated by the difference calculation unit 38 and the second derivative calculated by the second derivative calculation unit 40.
  • the buffer 44 holds the luminance information photographed on the first image and the result of its second derivative in order to acquire a plurality of luminance information at different times by disposing the focus lens at different positions.
  • the LUT storage unit 36 stores the relationship between the blur parameter and the focusing lens position in the form of a look-up table (LUT) as the relationship between the blur parameter and the focus position of the light of the subject. .
  • the arrangement of the optical system 12 is determined according to the focus lens position.
  • the control parameter calculation unit 34 functioning as an arrangement determining unit refers to the LUT in the LUT storage unit 36 so that the position of the focus lens corresponding to the blur parameter calculated by the blur parameter calculation unit 42 is obtained. Find the focal lens position.
  • the subject determining unit 18 determines the type of subject (step S10).
  • the type of subject that the photographer intends to shoot at least “close object”, “distant subject”, “person”, “night subject”, “standard subject”.
  • the user selects by operating the user interface (subject determining unit 18).
  • the subject determining unit 18 determines the type of the selected subject as the type of subject to be photographed.
  • the arrangement of the optical system 12 such as the focus lens position and the aperture diameter at the time of shooting in the imaging apparatus, and the shooting conditions such as shot speed are affected by the determined type of subject.
  • the luminance information acquisition position calculation unit 20 is optimal for performing focus detection based on the type of subject selected by the subject determination unit 18 according to control of a controller (not shown). Calculate the focus lens position L1 (step S1 2).
  • the luminance information acquisition position calculation unit 20 estimates that the main subject is within 60 cm of the imaging device force and Ocm force, although the distance range when shooting a close subject varies depending on the design of the optical system 12. To do.
  • the focus lens position L1 calculated by the luminance information acquisition position calculation unit 20 is a predetermined position within this range. If the subject type determined by the subject determination unit 18 is a distant or night scene subject, the main subject is estimated to be at a distance close to infinity. Therefore, the luminance information acquisition position calculation unit 20 calculates the focus lens position L1 as infinity.
  • the luminance information acquisition position calculation unit estimates that the distance of the main subject exists at a distance of about lm to 5 m.
  • the focus lens position L1 calculated by 20 is a predetermined position in this range.
  • the subject type determined by the subject determination unit 18 is a standard subject, the subject type is not a subject that matches the specific subject, so the aperture diameter, shot speed, etc.
  • the shooting conditions are set based on a predetermined function. Therefore, in this case, since the estimated position of the main subject is unknown, the luminance information acquisition position calculation unit 20 does not need to calculate the focus lens position L1 corresponding to the distance, and is set to a predetermined position. Good.
  • the optical system control unit 26 drives the focus lens and the aperture diameter of the optical system 12 according to the control of a controller (not shown) (step S14), focus detection will be performed.
  • focus detection By performing focus detection by the DFD method at such a focus lens position L1, one of the two blurred images is close to the focused image, resulting in higher accuracy in calculating the blur parameter.
  • the subject distance can be obtained with high accuracy.
  • focus detection can be performed with high accuracy according to the type of subject.
  • the focus detection method estimates the size of the blur from the luminance information, it is preferable to acquire the luminance information under an exposure condition in which the blur appears as significantly as possible. Therefore, the photometric sensor 22 measures the incident light from the subject (step S16), and from the result, the exposure condition calculation unit 24 calculates the shutter speed of the image sensor 14 according to the control of a controller (not shown) (step S16). S18). At this time, the shirt speed corresponding to the type of the selected subject may be calculated.
  • the aperture diameter is open. The aperture diameter may be set according to the selected subject.
  • the luminance information acquisition unit 30 acquires the luminance information of the first image of the subject and controls the distance estimation calculation unit according to the control of the controller (not shown).
  • the obtained first luminance information is stored in the buffer 44 in the 28 blur parameter calculation unit 32 (step S20).
  • the optical system control unit 26 drives the focus lens of the optical system 12 to a predetermined second focus lens position L2 different from the focus lens position L1 in accordance with control of a controller (not shown).
  • the luminance information acquisition unit 30 acquires the luminance information of the second image of the subject (step S22).
  • the acquired luminance information of the second sheet is supplied to the distance estimation calculation unit 28.
  • the blur parameter calculation is performed in the distance estimation calculation unit 28 under the control of a controller (not shown). That is, in the blur parameter calculation unit 32, the difference calculation unit 38 reads the first luminance information from the buffer 44, and the difference from the second luminance information supplied from the luminance information acquisition unit 30. Is calculated. In addition, the second derivative calculation unit 40 receives the second sheet supplied from the luminance information acquisition unit 30. The second derivative of the luminance information is calculated, and if it is calculated, the first luminance information is read from the buffer 44 and the second derivative is calculated.
  • the blur parameter calculation unit 42 calculates the division between the difference result calculated by the difference calculation unit 38 and the average value of the second derivative calculated by the second derivative calculation unit 40 for the extracted region. To obtain the blur parameter (step S26).
  • the blur parameter has a linear relationship with the reciprocal of the subject distance, and furthermore, there is a one-to-one correspondence between the subject distance and the focus lens position, so the blur parameter and the focus lens position As shown in Fig. 4, the one-to-one correspondence is also saved.
  • This relationship is stored as a table (LUT) in the LUT storage unit 36.
  • the distance information corresponding to the subject distance value is represented by the position of the focus lens. Therefore, the control parameter calculation unit 34 uses the blur parameter obtained by the blur parameter calculation unit 32 and the information of the V and L table (LUT) stored in the LUT storage unit 36 to use the focus lens position DFD for the subject.
  • Find LF by linear interpolation step S28. In this way, the control parameter calculation unit 34 calculates the subject distance value corresponding to the blur parameter.
  • the control parameter calculation unit 34 inputs the estimated in-focus lens position DFD-LF to the optical system control unit 26.
  • the drive circuit (not shown) of the optical system control unit 26 generates a signal for arranging the focus lens using the target lens position as a target lens position. , Not shown !, input the signal to the end-user and place the focus lens at the desired position (step S30).
  • step S32 When the focus lens is driven to the target lens position, the focus detection is completed (step S32).
  • the imaging apparatus can also be configured as a single-lens reflex camera 46 as shown in FIG.
  • the optical system 12 has a Lens 12A, reflex mirror 12B, and AF optical systems 12C and 12D for guiding light rays to AF imaging elements 14A and 14B for focus detection.
  • the taking lens 12A has a focus lens for adjusting the focus.
  • the subject image formed by the taking lens 12A is converted into a digital signal by the image sensor.
  • the image sensor includes a photographic image sensor 14C for shooting and two AF image sensors (14A, 14B), and one of the AF image elements is optically equivalent to the photographic image sensor 14C. Has been placed. In the present embodiment, it is assumed that the AF image sensor 14A is arranged.
  • the single-lens reflex camera 46 in this modification uses the AF image sensors 14A and 14B as the image sensor of the luminance information acquisition unit 30, and the distance estimation calculation unit 28 is blurred.
  • the omission of the buffer 44 from the parameter calculation unit 32 is a structural difference from the compact camera 10 in the first embodiment. That is, in this modification, the electric signal converted by the AF imaging elements 14A and 14B is converted into two pieces of luminance information by the luminance signal control unit 16, and the difference between the blur parameter calculation unit 32 of the distance estimation calculation unit 28 is calculated. It is supplied to the calculation unit 38 and the secondary differential calculation unit 40.
  • the focus detection processing of the single-lens reflex camera 46 in the present modification example configured as described above is as shown in the flowchart of FIG.
  • the description will be limited to a method for detecting focus using two pieces of brightness information of different blur acquired by two imaging elements (AF imaging elements 14A and 14B) having different arrangements.
  • the type of the subject selected by the photographer through the user interface is determined as the type of subject to be shot (step S10)
  • the luminance information acquisition position calculation unit 20 calculates the optimum focus lens position L1 for performing focus detection (step S12), and the optical system control unit 26
  • the focus lens in the taking lens 12A of system 12 is driven (step S14).
  • the incident light from the subject is measured by the photometric sensor 22 (Step S 16), and from the result, the exposure condition calculation unit 24 calculates the imaging conditions such as the shutter speed and aperture diameter of the image sensor 14 ( Step S18).
  • the luminance information acquisition unit 30 performs the two luminance information at the focus lens position L1 that is set to drive in step S14 according to the control of a controller (not shown).
  • the distance estimation calculation unit 28 calculates the focus lens position using the two pieces of luminance information acquired at the same time. That is, at the focus lens position L1, two pieces of luminance information having different blurs are simultaneously acquired from the imaging elements 14A and 14B having different positions (steps S34A and S34B).
  • the difference calculation unit 38 in the blur parameter calculation unit 32 of the distance estimation calculation unit 28 calculates the difference between the two luminance information
  • the second derivative calculation unit 40 calculates the difference between the two luminance information. Calculate the second derivative at once and find the average value.
  • step S24 a block in which the average value of the second derivative of the two images exceeds the threshold value is extracted as a region for calculating the blur parameter (step S24).
  • the blur parameter calculation unit 42 divides the difference result and the average of the second derivative for the extracted region to calculate a blur parameter (step S26).
  • the control parameter calculation unit 34, the LUT storage unit 36, and the optical system control unit 26 are used to drive the focus lens of the optical system 12 to the in-focus lens position corresponding to the blur parameter. Arrange (steps S28 to S120) and complete focus detection (step S32).
  • the imaging apparatus according to the present modification is a compact camera 10 as shown in FIG. 1.
  • the description of the same parts as in the first embodiment is omitted, and only the differences in structure will be mainly described below. .
  • the compact camera 10 according to the present modification includes a luminance information acquisition unit control unit 48 that functions as condition setting means in addition to the configuration of the first embodiment.
  • the optical system 12 is a lens group (taken lens) that is configured by a plurality of lens groups and a diaphragm and is intended to take an image.
  • a part of the lens group can be driven in the optical axis direction to adjust the focus.
  • the imaging element 14 is driven in the optical axis direction. The focus is adjusted.
  • the luminance information acquisition unit control unit 48 includes an actuator and a driving circuit for driving the actuator, and controls the position of the image sensor 14.
  • the system control unit 26 controls only the aperture diameter of the optical system 12. Further, in this modification, the LUT storage unit 36 of the distance estimation calculation unit 28 uses a look-up table (relationship between the blur parameter and the focus imaging device position as the relationship between the blur parameter and the focus position of the object power). (LUT).
  • Focus detection processing of the compact camera 10 in the modified example having the above-described configuration will be described with reference to the flowchart of FIG.
  • the description will be limited to a method of detecting focus using two pieces of brightness information obtained by changing the position of the image sensor 14 and having two different blurs.
  • the type of subject selected by the photographer using the user interface is determined as the type of subject to be photographed (step S10).
  • the luminance information acquisition position calculation unit 20 calculates the optimal image sensor position D1 for performing focus detection (step S36). Then, the luminance information acquisition unit control unit 48 drives and sets the image sensor 14 at the calculated image sensor position D1 (step S38).
  • the shutter speed and the aperture diameter are calculated by the photometric sensor 22 and the exposure condition calculation unit 24 (steps S16 and S18).
  • luminance information of the first sheet is acquired at the image sensor position D1 (step S40). Thereafter, the luminance information acquisition unit control unit 48 drives the imaging device 14 to a predetermined second imaging device position D2 different from the imaging device position D1 according to the control of the controller (not shown), and the luminance information acquisition unit In 30, the brightness information of the second image of the subject is acquired (step S42). Then, the blur parameter calculation unit 32 uses the two pieces of luminance information to calculate the blur parameter in the same manner as in the first embodiment (steps S24 and S26).
  • the LUT storage unit 36 of the distance estimation calculation unit 28 stores the correspondence relationship between the blur parameter and the in-focus image sensor position, and the control parameter calculation unit 34 is stored in the LUT storage unit 36!
  • the focus imaging device position DFD—DF with respect to the subject is calculated using the speaking table (LUT) (step S44).
  • the calculated in-focus image sensor position DFD-DF is input to the luminance information acquisition unit control unit 48.
  • the driving information is not shown in the luminance information acquisition unit control unit 48.
  • the path generates a signal for placing the image pickup device 14 with the target image pickup device position as the target image pickup device position. Not shown!
  • the signal is input to the actuator to place the image pickup device 14 at a desired position (step S46). .
  • the imaging apparatus according to the present embodiment is a compact camera 10 as shown in FIG. 1, and the description of the same parts as in the first embodiment will be omitted, and only the differences in structure will be mainly described below.
  • the power that the subject determining unit 18 determines the type of the subject according to the input of the user interface is configured to determine the type of the object using the luminance information acquired by the luminance information acquisition unit 30 configured by the imaging device 14 and the luminance signal control unit 16.
  • the subject determination unit 18 determines the color information of the input luminance information, the color information determination unit 18A for determining the color information of the luminance information, and also the distribution of the luminance information.
  • a luminance distribution discriminating unit 18B for discriminating and an edge information discriminating unit 18C for discriminating the edge information of the luminance information are also provided.
  • the focus detection process of the compact camera 10 in the present embodiment having the above-described configuration will be described with reference to the flowchart of FIG. Note that here, as described in the background art, the description will be limited to a method for detecting focus using two pieces of luminance information obtained by changing the position of the focus lens and having two different blurs.
  • the optical system control unit 26 moves the focus lens position of the optical system 12 to the lens position LO indicating the nearest point, and the luminance at the lens position L 0
  • the information acquisition unit 30 acquires the luminance information of the subject (step S48).
  • subject The determination unit 18 identifies the type of the subject from the acquired luminance information and determines the type of the subject to be photographed (step S50).
  • the subject determination unit 18 has a luminance information with low saturation based on the determination results of the color information determination unit 18A, the luminance distribution determination unit 18B, and the edge information determination unit 18C. If the gradation distribution is small !, the subject type is determined to be a distant subject.
  • the subject determination unit 18 has luminance information with high saturation and a color tone due to room light based on the determination results of the color information determination unit 18A, the luminance distribution determination unit 18B, and the edge information determination unit 18C. If the gradation variance is large, the subject type is determined to be a foreground subject.
  • the subject determination unit 18 uses the subject information when the color information indicates skin color in a specific region based on the determination results of the color information determination unit 18A, the luminance distribution determination unit 18B, and the edge information determination unit 18C. Is recognized as a person.
  • the subject determination unit 18 uses the edge information of the luminance information based on the determination results of the color information determination unit 18A, the luminance distribution determination unit 18B, and the edge information determination unit 18C. If the total edge strength is smaller than a predetermined value and the color information indicates black, the subject type is determined to be a night scene subject.
  • the information on the color as described above is obtained by using the image pickup device 14 having a bay arrangement.
  • the subject determination unit 18 determines the type of the subject using the input luminance information. Then, the luminance information acquisition position calculation unit 20 calculates the lens position L1 according to the type of the subject determined by the subject determination unit 18 (step S12).
  • the optical system control unit 26 determines a predetermined value within this range.
  • the focus lens is driven to position L1, and focus detection is performed in the same manner as in the first embodiment (steps S14 to S32).
  • the same effect as in the first embodiment can be obtained without the user selecting a shooting scene in focus detection using the DFD method.
  • the imaging apparatus according to this modification is a compact camera 10 as shown in FIG. 1, and the description of the same parts as in the second embodiment is omitted, and only the differences in structure will be mainly described below. .
  • the compact camera 10 in this modification includes a luminance information acquisition unit control unit 48 in addition to the configuration of the second embodiment.
  • the optical system 12 is a lens group (taking lens) that includes a plurality of lens groups and a diaphragm and is intended to take an image.
  • some of the lens groups are configured to be driven in the optical axis direction in order to adjust the focus.
  • the image sensor 14 is driven in the optical axis direction. By doing so, the focus is adjusted.
  • the luminance information acquisition unit control unit 48 includes an actuator and a driving circuit for driving the actuator, and controls the position of the image sensor 14.
  • the optical system control unit 26 controls only the aperture diameter of the optical system 12 in this modification. Further, in this modification, the LUT storage unit 36 of the distance estimation calculation unit 28 looks at the relationship between the blur parameter and the focus imaging element position as the relationship between the blur parameter and the focus position of the subject force light. Memorize it in the form of an uptable (LUT).
  • the focus detection process of the compact camera 10 in the modified example having the above configuration will be described with reference to the flowchart of FIG.
  • the description will be limited to a method of detecting focus using two pieces of brightness information obtained by changing the position of the image sensor 14 and having two different blurs.
  • the luminance information acquisition unit control unit 48 drives the imaging device 14 to the imaging device position DO where the focus position of the imaging device 14 indicates the nearest point in accordance with control of a controller (not shown), and the luminance information acquisition unit. 30 obtains luminance information of the subject (step S52).
  • the subject determination unit 18 determines the type of the subject from the luminance information as in the second embodiment (see FIG. Step S50).
  • the luminance information acquisition position calculation unit 20 calculates the image sensor position D1 that is focused on the distance assumed for each subject as described in the first embodiment (step S36). Then, the luminance information acquisition unit control unit 48 drives and sets the image sensor 14 at the calculated image sensor position D1 (step S38).
  • the photometer sensor 22 and the exposure condition calculation unit 24 calculate the shot speed and the aperture diameter (steps S16 and S18).
  • luminance information of the first sheet is acquired at the image sensor position D1 (step S40). Thereafter, the luminance information acquisition unit control unit 48 drives the imaging device 14 to a predetermined second imaging device position D2 different from the imaging device position D1 according to the control of the controller (not shown), and the luminance information acquisition unit In 30, the brightness information of the second image of the subject is acquired (step S42). Then, the blur parameter calculation unit 32 uses these two pieces of luminance information to calculate a blur parameter in the same manner as in the first and second embodiments (steps S 24 and S 26).
  • the LUT storage unit 36 of the distance estimation calculation unit 28 stores the correspondence relationship between the blur parameter and the focus imaging element position, and the control parameter calculation unit 34 is stored in the LUT storage unit 36!
  • the focus imaging device position DFD—DF with respect to the subject is calculated using the speaking table (LUT) (step S44).
  • the calculated in-focus image sensor position DFD-DF is input to the luminance information acquisition unit control unit 48.
  • the drive circuit of the luminance information acquisition unit control unit 48 uses the signal as a target image sensor position to signal the image sensor 14. Is generated and the signal is input to the actuator to place the image sensor 14 at a desired position (step S46).
  • the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the gist of the present invention. is there. [0070]
  • the brightness information with different blur is obtained by changing the aperture diameter, which is obtained by driving the position of the focus lens and the image sensor to acquire different brightness information of the two blurs. Even if it is the structure to acquire, the effect similar to the said Example is acquired.
  • Each calculation unit and calculation unit may be configured by a single piece of hardware such as a DSP or a CPU.

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Abstract

Dans un dispositif d'imagerie, l'agencement d'un système optique (12) est décidé en fonction d'un paramètre de flou qui correspond à la distance entre le système optique et un objet, calculée en utilisant différentes informations de luminance qui présentent des flous différents. Le dispositif d'imagerie comprend une unité (18) de décision d'objet qui décide du type de l'objet et une unité (20) de calcul de la position d'acquisition d'informations de luminance qui lors de la réalisation d'une image calcule les conditions d'imagerie en fonction de la sortie de l'unité de décision d'objet. Les conditions d'imagerie nécessaires pour acquérir parmi plusieurs informations de luminance qui présentent des flous différents au moins une information de luminance utilisée pour le calcul du paramètre de flou dans l'unité (32) de calcul du paramètre de flou sont réglées en fonction des conditions d'imagerie calculées par l'unité (20) de calcul de la position d'acquisition d'informations de luminance.
PCT/JP2006/322264 2005-11-15 2006-11-08 Dispositif d'imagerie WO2007058099A1 (fr)

Applications Claiming Priority (2)

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JP2005-330461 2005-11-15
JP2005330461A JP2007139894A (ja) 2005-11-15 2005-11-15 撮像装置

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JP5771913B2 (ja) * 2009-07-17 2015-09-02 株式会社ニコン 焦点調節装置、およびカメラ
WO2011007869A1 (fr) * 2009-07-17 2011-01-20 株式会社ニコン Dispositif de mise au point et appareil-photo
JP5771914B2 (ja) * 2009-07-17 2015-09-02 株式会社ニコン 焦点調節装置、およびカメラ
JP5757099B2 (ja) 2010-02-15 2015-07-29 株式会社ニコン 焦点調節装置、及び焦点調節プログラム
JP5824364B2 (ja) * 2010-06-17 2015-11-25 パナソニック株式会社 距離推定装置、距離推定方法、集積回路、コンピュータプログラム
JP6040422B2 (ja) * 2013-03-26 2016-12-07 パナソニックＩｐマネジメント株式会社 撮像装置
JP2015036632A (ja) * 2013-08-12 2015-02-23 キヤノン株式会社 距離計測装置、撮像装置、距離計測方法
JP6300670B2 (ja) * 2014-07-09 2018-03-28 キヤノン株式会社 焦点調節装置、焦点調節方法およびプログラム、並びに撮像装置

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