WO2005098503A1 - 合焦情報取得用検出装置及びそれを用いた撮像装置 - Google Patents
合焦情報取得用検出装置及びそれを用いた撮像装置 Download PDFInfo
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- WO2005098503A1 WO2005098503A1 PCT/JP2005/004998 JP2005004998W WO2005098503A1 WO 2005098503 A1 WO2005098503 A1 WO 2005098503A1 JP 2005004998 W JP2005004998 W JP 2005004998W WO 2005098503 A1 WO2005098503 A1 WO 2005098503A1
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- Prior art keywords
- plane
- luminance information
- focus
- equivalent
- light
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
- G02B7/38—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals measured at different points on the optical axis, e.g. focussing on two or more planes and comparing image data
Definitions
- the present invention relates to a focus information acquisition detecting device that forms an image of a subject via an optical element, and acquires focus information from a plurality of pieces of luminance information obtained in different blur states, and such focus information.
- the present invention relates to an imaging device using an acquisition detection device.
- Japanese Patent Publication No. 3-52607 discloses that an object image is projected onto a pair of light receiving elements arranged with a predetermined optical path difference before and after a plane to be focused, and obtained image information is obtained.
- a method of detecting a focused state of an object based on a predetermined evaluation function As a basic method of using this method, there is a camera equipped with a focus determination device. In this method, a so-called front focus and a rear focus are determined by obtaining object information on two surfaces separated by the same distance with respect to a plane to be focused. The result of the judgment is useful for driving, for example, a focusing lens of the focusing optical system in a correct adjustment direction.
- USP 4,965,840 image information is obtained at two locations having different optical path lengths in order to calculate a spread parameter by performing arithmetic processing on a plurality of images having different blur states and determine focus.
- the spread parameter is a representative value indicating the blur state of the image information, which is related to the point spread function of the optical system, and the point on the image plane passes through a number of paths of the optical system.
- the variance in the case where the image is formed as a region instead of as a region is represented as follows.
- a spread parameter is finally calculated under conditions of different optical path lengths, that is, based on first image information and second image information having different blur states.
- the calculation may fail in the spread parameter calculation, and an accurate value may not be obtained.
- the optical path length for which the focus is determined is too different from the imaging plane on which the focus is to be determined, the In this case, the blur state may be too different, and the focusing accuracy on the imaging surface may be reduced.
- the present invention has been made in view of the above points, and is capable of being arranged in a limited space and capable of acquiring high-precision focus information. It is an object of the present invention to provide an imaging device that has been used.
- the plane to be focused At least one of a plurality of images having different blurs formed by the light guided by the light guiding means, and a light guiding means for guiding light so as to form an image on an equivalently-focused surface which is optically equivalent.
- Brightness information obtaining means for obtaining brightness information of regions corresponding to each other in the two images, and optically equivalently on the same optical axis defined in the optical system with the object as a base point.
- the above-mentioned equivalent in-focus planned surface position is located between at least one set of luminance information acquisition positions.
- a focus information acquisition detection device characterized by being sandwiched
- the focusing plane At least one of a plurality of images having different blurs formed by the light guided by the light guiding means, and a light guiding means for guiding light so as to form an image on an equivalently-focused surface which is optically equivalent.
- Brightness information obtaining means for obtaining brightness information of regions corresponding to each other in the two images, and optically equivalently on the same optical axis defined in the optical system with the object as a base point.
- Focusing information acquisition detecting device characterized in that There is provided.
- an optical system in order to form the light of the object power on the surface to be focused, An optical system, a focusing information acquiring detection device such as the focusing information acquiring detecting device according to the first or second aspect of the present invention, and an imaging element arranged on the focusing surface.
- an imaging device comprising the same.
- FIG. 1 is a schematic diagram showing a configuration of a single-lens reflex digital camera as an imaging device using a focusing information acquisition detecting device according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration of a focus information acquiring detection device according to a first example of the present invention.
- FIG. 3 is a diagram showing schematic steps of a focus determination method for calculating a spread parameter and determining focus.
- FIG. 4 illustrates a positional relationship between a focusing lens and an imaging position, and two focus determination image luminance information and two captured images for the same portion P of the same subject based on the positional relationship.
- FIG. 5A is a diagram illustrating first and second luminance information acquiring sensors when the positional relationship between the first and second luminance information acquiring sensors and the plane to be equivalently focused is in the first positional relationship.
- FIG. 3 is a diagram for explaining the size of a light receiving surface required for the present invention.
- FIG. 5B is a diagram illustrating the first and second luminance information acquiring sensors when the positional relationship between the first and second luminance information acquiring sensors and the plane to be equivalently focused is in the second positional relationship.
- FIG. 3 is a diagram for explaining the size of a light receiving surface required for the present invention.
- FIG. 5C is a diagram illustrating the first and second luminance information acquiring sensors when the positional relationship between the first and second luminance information acquiring sensors and the plane to be equivalently focused is in a third positional relationship.
- FIG. 3 is a diagram for explaining the size of a light receiving surface required for the present invention.
- FIG. 6 is a diagram showing a configuration of a focus information acquiring detection device according to a second embodiment of the present invention.
- FIG. 7 is a diagram showing a configuration of a focus information acquiring detection device according to a third embodiment of the present invention.
- FIG. 8A is a diagram showing a relationship between an equivalent focusing expected plane and a first luminance information acquisition sensor when a focusing lens is at a first position.
- FIG. 8B is a diagram showing the relationship between the equivalent focusing expected plane and the first luminance information acquisition sensor when the focusing lens is at the second position.
- FIG. 8C is a diagram showing a relationship between an equivalent focusing expected plane and a first luminance information acquisition sensor when the focusing lens is at a third position.
- FIG. 9 is a diagram showing a configuration of a focus information acquiring detection device according to a fourth embodiment of the present invention.
- FIG. 10A is a diagram showing a relationship between an expected focusing surface and an image sensor when the image sensor is at a first position.
- FIG. 10B is a diagram showing the relationship between the planned focusing plane and the image sensor when the image sensor is at the second position.
- FIG. 10C is a diagram showing the relationship between the planned focusing plane and the image sensor when the image sensor is at the third position.
- the term “planned surface to be focused” is used to determine the position of the light receiving surface of the image pickup element from the reference position force on the image pickup device when the image pickup device is configured, and at the same time, Is also assumed to be located at a predetermined position from the imaging device reference point.
- the “planned plane position” is perpendicular to the optical axis set in the optical system with a certain width in the existing range. It is assumed that it is determined as a surface.
- the “equivalent in-focus plane” is an optically equivalent position to such an in-focus plane and takes into account optical characteristics including aberrations of all optical elements interposed in the middle, manufacturing and assembly errors.
- the optical axis is determined to be a plane perpendicular to the optical axis equivalent to the optical axis that can also be predetermined with respect to the plane to be focused, at an optically equidistant position corresponding to the existence range of the plane to be focused.
- the "luminance information” indicates the obtained sensor signal information itself.
- signal information for each color band acquired by each color filter for example, signal information for each of R, G, and B is used. Good! Then, it may be a single signal information obtained by combining these pieces of signal information.
- the signal information itself is also area-type sensor force.General image information that has acquired two-dimensional arrangement, one-dimensional rearrangement of this two-dimensional image information, and line-type sensor force There is no restriction on the format of the signal information, such as the acquired one-dimensional thing, the image sensor itself is one segment and the information of one point.
- a single-lens reflex digital camera as an imaging device using a focus information acquisition detection device has an interchangeable lens 12 detachably attached to a camera body 10.
- the interchangeable lens 12 includes a plurality of lenses, a lens group, a diaphragm, a lens barrel, and the like, and is capable of adjusting a focal length, a focusing lens position, a light amount, and the like.
- such a configuration of the interchangeable lens 12 is represented by only the focusing lens 14 for simplicity, and other illustrations are omitted.
- a part of the quick return mirror 18 is a transmission mirror, and a part of the subject light transmitted through this light transmission part is reflected by a total reflection type sub mirror 24 and is transmitted to a transmission type mirror 26.
- the light beam transmitted through the transmission mirror 26 is imaged on a first luminance information acquisition sensor 30 located on the subject side on the optical path with respect to the first equivalent focusing surface 28-1. I have.
- the light beam reflected by the transmission mirror 26 passes through the second equivalent focusing surface 28-2, and then acquires the second luminance information arranged on the optical path on the non-subject side from the equivalent focusing surface in the optical path.
- the image is formed on the image sensor 32.
- the calculation unit (not shown) performs an appropriate calculation to move the focusing lens position of the focusing lens 14 to the focusing position. For Is generated.
- At least two pieces of focus determination image luminance information 100 of the same part P of the same subject are captured by an imaging parameter that affects the blurred state of the captured image 102. Obtained by changing at least one parameter.
- the photographing parameters include a focusing lens position, an aperture amount, a focal length, and the like.
- the description will be limited to a case where only the optical path length between the plane to be focused and the object is changed.
- the focusing lens 14 is moved to prescribed first and second locations in order to change the optical path length between the plane to be focused and the subject (step S10A, step S10B), and obtain the first and second image luminance information, respectively (step S12A, step S12B).
- Each of the acquired images is subjected to normalization processing such as image magnification and luminance distribution (steps S14A and S14B), and if necessary, selects an area in the acquired image information for which focus determination is to be performed (step S14A).
- S16A, step S16B The selection is made for one of the image information, and the corresponding area is selected for the other image information.
- a preprocessing operation such as smoothing for calculating a spread parameter is performed on the focus determination area of the selected first and second image information (steps S18A and S18B).
- the spread parameter of the captured image in the present method is calculated by integrating the two preprocessing calculation results (step S20). It should be noted that a database corresponding to the spread parameter and the focusing lens position at which the focus state can be obtained for the spread parameter is obtained in advance. Therefore, if the obtained spread parameters are referred to in this correspondence database, a movement command value of a focusing lens driving actuator (not shown) for obtaining a focused state is generated (step S22). ).
- the first luminance information acquisition sensor 30 is arranged on the subject side on the optical path with respect to the first equivalent in-focus plane 28-1, and the second Planned equivalent focal plane 28-2 Are disposed on the optical path, on the optical path, on the non-subject side from the planned equivalent focusing plane through the second planned equivalent focusing plane 28-2.
- FIG. 7 is a diagram showing an equivalent in-focus plane 28.
- the distance between the first luminance information acquisition sensor 30 and the second luminance information acquisition sensor 32 is a constant value d
- d the distance between the first luminance information acquisition sensor 30 and the second luminance information acquisition sensor 32
- the size of the light-receiving surface indicated by a bold line which is necessary to acquire the luminance information in the blurred state where the focus determination area is different, is determined by the first luminance information acquisition sensor 30 and the second luminance information acquisition sensor 32. It is the smallest when the equivalent focusing surface 28 is arranged between them. Therefore, in the present embodiment, by arranging in this way, it is possible to determine the focus with a smaller luminance information acquisition sensor, to reduce the size of the focus determination device, and to easily mount it on the imaging device. It becomes possible to do.
- FIGS. 5A to 5C show diagrams in which light beams of a subject are in focus on the equivalent focusing surface 28 as an ideal conceptual diagram.
- the front focus and the rear focus exist with respect to the equivalent in-focus target plane 28 according to the position of the focusing lens 14 and the camera power in accordance with the distance to the subject.
- the position where the light beam from the subject is most narrowed is shifted from the equivalent focusing expected plane 28, so the focusing process described in FIGS. Does not hold.
- the distance from the equivalent focusing expected plane 28 in the front focus and rear focus states compared to the distance d, that is, when the defocus amount is small, the above explanation is satisfied, and especially, the focusing accuracy is required. This condition will be satisfied in the focusing stage that is performed.
- the transmittance may be any value such as 33% or 66% depending on the algorithm or processing. Good transmittance. No restrictions are placed on the transmittance. Further, in the present embodiment, only the reflection optical system is provided on the optical path for acquiring the focus information. However, if necessary, an arbitrary optical element such as a concave lens, a convex lens, and an ND filter may be interposed. I do not care.
- the brightness information acquisition sensors 30, 32 may be in various forms, for example, an area type CCD of about 640 x 480 pixels or an area readable CMOS sensor, or a dedicated sensor in which a plurality of line sensors are arranged in an island shape. Is possible. Further, color, black and white, infrared wavelengths, and ultraviolet wavelengths may be used. No restrictions are placed on the type of sensor. In the case of a monochrome sensor, the acquired sensor information is used directly as luminance information. In the case of a color sensor, for example, of the R, G, and B luminance information, only the G component is used. Brightness information may be used, or brightness information may be obtained by combining R, G, and B at a fixed ratio.
- the brightness information acquisition sensors 30, 32 are respectively inclined with respect to the respective equivalent in-focus scheduled surfaces 28-1 and 28-2 in such a manner that the normal direction set on each surface is oblique. It is desirable to arrange them so that they face in the same direction from the viewpoint of uniform light reception.
- the inclinations of the equivalent focusing expected planes 28-1 and 28-2 are determined. Can be adjusted according to the sensor arrangement space. If the equivalent focal planes 28-1 and 28-2 are designed to be perpendicular to each other, the positional relationship between the luminance information acquisition sensors 30 and 32 is determined easily and with high accuracy and further easy to assemble. Is feasible.
- the spread parameter is more accurately calculated on the in-focus plane where the final focus state is obtained. There is a need. If the blur amount is too large, the accuracy of the spread parameter calculation will decrease due to the algorithm. If the distance between positions at which luminance information is acquired is determined within a range that does not cause a decrease in accuracy, and the focus determination area is considered constant, as the distance from the plane to be focused increases, the luminance increases as the distance increases. Sensors that acquire information require large sizes.
- the plane to be focused Since there is a luminance information acquisition position sandwiching, when considering the necessary luminance information acquisition sensor area, it is possible to provide only a small area as a whole, and as a result, it is possible to provide a small focusing determination acquisition apparatus and an imaging apparatus. I do.
- the transfer load of luminance information required for the calculation is small, and the calculation itself is completed in a short time. Further, it is possible to provide high-speed focus determination.
- the luminance information acquisition positions are set so that the optical path lengths of the above-mentioned equivalent focusing surface forces differ, the luminance information of a plurality of images having different blurs can be easily acquired due to the different optical path lengths.
- only one second brightness information acquisition sensor 32 is provided.
- the number of the second brightness information acquisition sensor 32 may be two or more.
- a transmissive mirror 34 is further disposed rearward from the second equivalent in-focus target plane 28-2 with a directional force from the subject side on the optical path. Then, a part of the light beam reflected by the transmission mirror 26 through the sub-mirror 24 is further transmitted through the transmission mirror 34, and the transmitted light partially transmitted by the transmission mirror 34 is converted into one second luminance information acquisition sensor 32— Light is received at 1. Further, the other second brightness information acquisition sensor 32-2 is arranged at an optical path length position different from the one second brightness information acquisition sensor 32-1, and the reflected light from the transmission mirror 34 is reflected. Is received by the other second brightness information acquisition sensor 32-2.
- these second luminance information acquisition sensors 32-1 and 32-2 are arranged at optically different optical path length positions with respect to the equivalent focusing surface 28-2. Regardless of the combination of the first luminance information acquisition sensor 30 and the second luminance information acquisition sensor 32-1 and 32-2, the planes 28-1 and 28-2 to be equivalently focused are interposed between the sensors. Have been. With this arrangement, when the relative distances of the three luminance information acquisition sensors 30, 32-1, and 32-2 are constant, the luminance information acquisition sensors are similar to those described with reference to FIGS. 5A to 5C. The required area of the light receiving surface is minimized, and the size of the focus determination device can be reduced.
- a plurality of transmission mirrors may be installed with the same idea. And, needless to say, even if the number of the luminance information acquisition sensors becomes three or more, the same effect is exerted.
- the above-mentioned effect obtained by arranging the plane to be focused (the plane to be equivalently focused) between at least one set of sensors for acquiring luminance information has the same effect as the arrangement of only one sensor for acquiring luminance information.
- the same can be obtained by driving the focusing lens 14 back and forth in parallel with the optical axis.
- a first luminance information acquisition sensor 30 is arranged on the equivalent focusing surface 28. Then, as shown in FIGS. 8A to 8C, the focusing lens 14 is moved back and forth along the optical axis with the initial position being the state where the light beam from the subject is in focus, and the first position is moved at the desired timing.
- luminance information acquisition sensor 34 luminance information is acquired at two positions with the equivalent planned focal plane 30 interposed therebetween. Therefore, the light receiving surface area of the first luminance information acquisition sensor 34 can be small.
- the imaging sensor 16 may be used also for focus determination without disposing a dedicated sensor for focus determination.
- FIGS. 10A to 10C the same applies to the case where the image sensor 16 is moved forward and backward by the image sensor driving actuator 36 in parallel with the optical axis, and luminance information is acquired at at least two acquisition positions. is there.
- FIGS. 1OA to 10C since reference numerals are common in FIGS. 1OA to 10C, only the reference numerals are given to FIG. 10A for simplification of the drawing.
- an electrostatic driving actuator disclosed in JP-A-2001-9796 and JP-A-2001-9797 is used. can do. That is, if a large number of such electrostatic actuated actuators are arranged on the surface and the imaging sensor 16 is supported, the imaging sensor 16 is moved almost horizontally in the plane from the initial position plane of the imaging sensor 16 and is moved along the plane. It can also be moved back and forth in a direction perpendicular to the direction. As a result, the image sensor 16 is moved to the subject side and the non-object side as shown in FIG. 10A to FIG. It can be moved to the subject side.
- the cutout area for focus determination set on the imaging sensor 16 can be set to a small area, which does not reduce the sensor size of the imaging sensor 16 itself.
- the transfer load is reduced, and the amount of calculation is reduced. Therefore, a high-speed focus determination device can be provided.
- the imaging sensor 16 is moved. However, if the optical path length is changed, it is good V. Therefore, by moving the focusing lens 14 back and forth in parallel with the optical axis, luminance information can be adjusted at a desired timing. The same effect can be obtained even if the information is acquired by ringing.
- this method is a method that can be applied to a compact digital camera or the like that does not have a configuration such as the quick return mirror 18 and the sub mirror 24.
- the force for acquiring the luminance information with different blur states by moving the imaging sensor 16 is applied to the first luminance information acquisition sensor 30 in FIG.
- the same function can be realized by moving the optical disk back and forth along the optical path by providing the cutiator.
- the moving sensor is not limited.
- the focus information acquiring detection device and the imaging device it is possible to acquire a plurality of pieces of luminance information having different blur states without arranging a plurality of sensors, thereby reducing the cost and size of the device. Can be realized.
- the present invention is not limited to the application to a digital single-lens reflex camera as described in the above embodiments, a non-digital camera, a compact digital camera without an interchangeable lens, a quick return mirror, etc., a microscope It can be diverted to a focus information acquisition detection device of any type of imaging device such as an endoscope and a telescope.
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JP2004-100436 | 2004-03-30 | ||
JP2004100436A JP2005284134A (ja) | 2004-03-30 | 2004-03-30 | 合焦情報取得用検出装置及びそれを用いた撮像装置 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002296493A (ja) * | 2001-03-30 | 2002-10-09 | Fuji Photo Optical Co Ltd | ピント状態検出装置 |
JP2002365710A (ja) * | 2001-06-04 | 2002-12-18 | Fuji Photo Optical Co Ltd | ピント表示装置 |
JP2003279846A (ja) * | 2002-03-25 | 2003-10-02 | Fuji Photo Optical Co Ltd | 撮影レンズのピント状態検出装置 |
JP2003295050A (ja) * | 2003-03-03 | 2003-10-15 | Fuji Photo Optical Co Ltd | ピント状態検出装置 |
JP2004085673A (ja) * | 2002-08-23 | 2004-03-18 | Fuji Photo Optical Co Ltd | オートフォーカスシステム |
-
2004
- 2004-03-30 JP JP2004100436A patent/JP2005284134A/ja not_active Withdrawn
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2005
- 2005-03-18 WO PCT/JP2005/004998 patent/WO2005098503A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002296493A (ja) * | 2001-03-30 | 2002-10-09 | Fuji Photo Optical Co Ltd | ピント状態検出装置 |
JP2002365710A (ja) * | 2001-06-04 | 2002-12-18 | Fuji Photo Optical Co Ltd | ピント表示装置 |
JP2003279846A (ja) * | 2002-03-25 | 2003-10-02 | Fuji Photo Optical Co Ltd | 撮影レンズのピント状態検出装置 |
JP2004085673A (ja) * | 2002-08-23 | 2004-03-18 | Fuji Photo Optical Co Ltd | オートフォーカスシステム |
JP2003295050A (ja) * | 2003-03-03 | 2003-10-15 | Fuji Photo Optical Co Ltd | ピント状態検出装置 |
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