JP5326345B2 - Imaging device - Google Patents

Description

  The present invention relates to a photographing apparatus.

  Conventionally, a photographing apparatus having a plurality of optical systems is known. As an example of such a photographing apparatus, the electronic camera of Patent Document 1 includes a main camera for photographing a subject and a so-called self-taking sub-camera for photographing a photographer himself. When the sub camera is used for self-portrait, the distance between the sub camera and the photographer is almost a fixed value, so the sub camera has no zoom function.

However, in the above-described electronic camera, when the sub camera is photographed in the same direction as the main camera, that is, when the sub camera is not used for self-portrait, the subject distance varies from close to infinite, If the zoom function is not provided, the shooting range is fixed, which is not convenient.
JP 2006-33611 A

  The subject of this invention is providing the imaging device which can implement | achieve suitable imaging | photography.

According to one aspect, the photographing apparatus includes a view angle adjusting section for adjusting a first optical system for forming an image of the first object, the angle of the first optical system, at least a portion of the first object And a control unit that acquires lens information corresponding to the type of the interchangeable lens barrel from a memory built in the interchangeable lens barrel having the second optical system that forms an image of the subject including the control unit. Controlling the angle-of-view adjustment unit so that the angle of view of the first optical system becomes wider as the angle of view of the system becomes wider, and the angle of view of the first optical system becomes narrower as the angle of view of the second optical system becomes narrower; When it is determined that the interchangeable lens barrel is a tele zoom lens based on the lens information, the first optical system is more than when it is determined that the interchangeable lens barrel is a wide zoom lens based on the lens information. The value obtained by dividing the angle of view by the angle of view of the second optical system is increased. To control the angle-of-view adjustment unit.

Preferably, the control unit may control the angle-of-view adjustment unit so that the angle of view of the first optical system is wider than the angle of view of the second optical system.

Preferably, the control unit may control the angle of view adjustment unit so that a ratio between the angle of view of the first optical system and the angle of view of the second optical system becomes a predetermined value.

Preferably, the control unit may control the angle of view adjustment unit so that a ratio between a focal length of the first optical system and a focal length of the second optical system becomes a predetermined value.

Further, according to preferably first includes a recording unit that records information about at least one of the angle of view of the optical system及beauty second optical system, a control section, the information about the angle recorded in the record unit Then , the angle of view adjustment unit may be controlled.

  Preferably, the first image sensor that photoelectrically converts the image of the first subject formed by the first optical system, and the second that photoelectrically converts the image of the subject formed by the second optical system. The number of pixels of the second image sensor may be smaller than the number of pixels of the first image sensor.

Preferably, the first and second image processing for individually performing signal processing after conversion into a digital signal using the image signal obtained from the first image sensor and the image signal obtained from the second image sensor. It may have a part.

  According to the photographing apparatus of the present invention, suitable photographing can be realized using two optical systems.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In this embodiment, an electronic camera is used as an example of the photographing apparatus of the present invention. FIG. 1 is an external view of an electronic camera according to the first embodiment of the present invention. As shown in FIG. 1, the electronic camera 1 includes a camera body 10, a sub optical system 20, and a main optical system 30. The optical axis of the sub optical system 20 and the optical axis of the main optical system 30 are parallel.

  FIG. 2 is a block diagram showing the configuration of the electronic camera in the embodiment of the present invention. As shown in FIG. 2, the electronic camera 1 includes a sub optical system 20, a lens driving unit 22, a sub image sensor 23, an A / D conversion unit 24, a buffer memory 25, an image processing unit 26, a control unit 27, and a main optical system. 30, lens drive unit 32, lens built-in memory 33, main image sensor 34, A / D conversion unit 35, buffer memory 36, image processing unit 37, display unit 38, operation unit 39, recording I / F unit 40, recording medium 41 is provided. The main optical system 30, the lens driving unit 32, and the lens built-in memory 33 are provided in an interchangeable lens barrel that can be removed from the camera body 10.

  The sub optical system 20 includes an imaging lens 21, a diaphragm (not shown), and the like. The imaging lens 21 forms an image of the first subject on the imaging surface of the sub imaging element 23. The imaging lens 21 includes a plurality of lens groups including a focus adjustment lens that adjusts the image forming position of the sub image sensor 23 and a zoom lens that adjusts the focal length. The lens driving unit 22 adjusts the position of the imaging lens 21 in the optical axis direction based on the output of the control unit 27.

  The sub image sensor 23 photoelectrically converts an image of the first subject by the light beam that has passed through the imaging lens 21 and outputs an analog image signal. In the shooting mode, the sub image sensor 23 captures a recording image (first main image) when a release button described later is fully pressed. Further, the output of the sub image sensor 23 is used for analysis of a shooting scene by the control unit 27 described later during shooting standby. The output of the sub image sensor 23 is connected to the A / D converter 24. The A / D conversion unit 24 performs A / D conversion of the output signal of the sub image sensor 23. The output of the A / D conversion unit 24 is connected to the image processing unit 26.

  The image processing unit 26 performs various types of image processing (white balance adjustment, color interpolation, gradation conversion processing, contour enhancement processing, etc.) on the data output from the A / D conversion unit 24. The image processing unit 26 also executes a process of compressing the image data in the JPEG format before recording the image data on the recording medium 41 and a process of decompressing and restoring the compressed data. The buffer memory 25 temporarily records image data in the pre-process and post-process of image processing by the image processing unit 26. The control unit 27 is a processor that performs overall control of the electronic camera 1 according to a predetermined sequence program. In addition, the control unit 27 executes various calculations (AF, AE, etc.) necessary for shooting.

  The main optical system 30 includes an imaging lens 31, a diaphragm (not shown), and the like. The imaging lens 31 forms an image of the second subject on the imaging surface of the main imaging element 34. The imaging lens 31 includes a plurality of lens groups including a focus adjustment lens that adjusts the image forming position on the main image sensor 34 and a zoom lens that adjusts the focal length. The lens driving unit 32 adjusts the position of the imaging lens 31 in the optical axis direction based on the output of the control unit 27. The lens built-in memory 33 records lens information including the type of the interchangeable lens barrel. The output of the lens built-in memory 33 is connected to the control unit 27.

  The main image sensor 34 photoelectrically converts an image of the second subject by the light beam that has passed through the imaging lens 31 and outputs an analog image signal. In the shooting mode, the main image sensor 34 captures a recording image (second main image) when a release button described later is fully pressed. The main image sensor 34 captures a through image by thinning out at predetermined intervals even during standby for shooting. The output of the main image sensor 34 is connected to the A / D converter 35. The A / D conversion unit 35 performs A / D conversion of the output signal of the main image sensor 34. The output of the A / D conversion unit 35 is connected to the image processing unit 37.

  The image processing unit 37 performs the same image processing as the image processing unit 26 on the data output from the A / D conversion unit 35. The buffer memory 36 temporarily records image data in the pre-process and post-process of image processing by the image processing unit 37. The display unit 38 displays various images under the control of the control unit 27. Various images displayed on the display unit 38 include a first main image captured by the sub image sensor 23, a second main image captured by the main image sensor 34, a through image, an image recorded on the recording medium 41, and a menu. Includes screens. The operation unit 39 includes a release button, an operation button, and the like. The release button receives an instruction for an imaging operation from the user. The operation button receives an operation input on the menu screen or the like from the user. The state of the operation unit 39 is detected by the control unit 27. The recording I / F unit 40 is formed with a connector for connecting the recording medium 41. Then, the recording I / F unit 40 executes data writing / reading with respect to the recording medium 41 connected to the connector.

  The buffer memory 25, the image processing unit 26, and the control unit 27 are connected to each other. The buffer memory 36, the image processing unit 37, and the control unit 27 are connected to each other. The outputs of the image processing unit 26, the image processing unit 37, and the recording I / F unit 40 are connected to the display unit 38.

  Further, the optical axis of the sub optical system 20 and the optical axis of the main optical system 30 may be matched so that the center of the shooting area of the sub optical system 20 and the center of the shooting area of the main optical system 30 match. preferable. The control unit 27 controls each unit so that the field angle of the main optical system 30 is narrower than the field angle of the sub optical system 20.

  By the way, conventionally, in an electronic camera, a cellular phone, and the like, a model in which a sub camera for self-portrait is installed in addition to a main camera for normal shooting is known. However, in the conventional model, the focal length of the sub camera is fixed. For this reason, when the sub camera is photographed in the same direction as the main camera, it is not easy to change the angle of view and the composition, and the function for expressing the image is insufficient.

  For example, FIG. 3 shows an example of an image obtained by each camera when the lens of the main camera is zoomed to the telephoto side and the lens of the sub camera is fixed to the wide angle side. As shown in FIG. 3, even if the image obtained by the main camera is cut off, the image obtained by the sub camera is not cut off. However, since the focal length of the sub camera is short, the main subject (a person in the example of FIG. 3) in the image is small. For this reason, when the main subject is enlarged, the enlargement ratio is increased, the resolution is lowered, and the image is like a mosaic.

  Therefore, the electronic camera 1 of the first embodiment adjusts the focal length of the sub optical system 20 in accordance with the focal length of the main optical system 30. Thereby, even if the second main image captured by the main image sensor 34 is a failure such as a head cut, the first main image captured by the sub image sensor 23 can be saved. In addition, the size of the main subject with respect to the angle of view of the sub optical system 20 is not reduced, and it is possible to reduce the possibility that the image quality will deteriorate even if the main subject of the first main image is enlarged.

  FIG. 4 is a flowchart illustrating the operation of the control unit 27 during imaging in the electronic camera 1 of the first embodiment.

  In step S1, the control unit 27 starts the shooting mode. For example, the control unit 27 controls the main image sensor 34 to start capturing a through image.

  In step S <b> 2, the control unit 27 adjusts the focal length of the main optical system 30. For example, the control unit 27 controls the lens driving unit 32 to adjust the position of the imaging lens 31 based on the data of the through image captured in step S1.

  In step S <b> 3, the control unit 27 adjusts the focal length of the sub optical system 20. For example, the control unit 27 controls the lens driving unit 22 so that the ratio between the focal length of the main optical system 30 adjusted in step S2 and the focal length of the sub optical system 20 becomes a predetermined value. Adjust the position of 21. The ratio between the focal length of the sub optical system 20 and the focal length of the main optical system 30 may be changed according to the type of the interchangeable lens barrel recorded in the lens built-in memory 33. For example, when the interchangeable lens barrel is a WIDE zoom lens, the angle of view of the main optical system 30 is wide and it is considered that there is little head cut, so the ratio is reduced. On the other hand, when the interchangeable lens barrel is a TELE zoom lens, the effect of camera shake is large, so the ratio is increased.

  FIG. 5 shows an example of changes in the focal length of the sub optical system 20 and the main optical system 30 when the position of the zoom lens is moved from the wide angle side to the telephoto side. The zoom position is the position of the zoom lens. As shown in FIG. 5, the focal length of the sub optical system 20 and the focal length of the main optical system 30 are proportional. For example, if the focal lengths of the sub optical system 20 at the zoom positions A1, A2, and A3 are fs1, fs2, and fs3, and the focal lengths of the main optical system 30 are fm1, fm2, and fm3, fs1 / fm1 = fs2 / fm2 = fs3. / Fm3.

  An example of the imaging range of the sub optical system 20 and the main optical system 30 is shown in FIG. Note that the imaging range of the sub optical system 20 is approximately 10 to 20% wider than the imaging range of the main optical system 30 in the horizontal and vertical directions (L1 = L2, L3 = L4 in the example of FIG. 6). It is preferable.

  In step S4, the control unit 27 determines whether or not the release button has been fully pressed. If the release button is fully pressed (YES), the process proceeds to step S5. On the other hand, when the release button is not fully pressed (NO), the process returns to step S2. Thereby, the processing from step S2 to step S3 is repeated until the release button is fully pressed.

  In step S5, the control unit 27 controls the sub image sensor 23 to capture the first main image, and simultaneously controls the main image sensor 34 to capture the second main image.

  In step S6, the control unit 27 controls the image processing unit 26 to perform image processing on the data of the first main image captured by the sub image sensor 23 in step S5. Further, the control unit 27 controls the image processing unit 37 to perform image processing on the data of the second main image captured by the main image sensor 34 in step S5.

  In step S7, the control unit 27 records the first main image data and the second main image data subjected to the image processing in step S6 in separate files on the recording medium 41, and ends the series of processing. To do.

  The electronic camera according to the first embodiment adjusts the focal length of the sub optical system 20 in accordance with the focal length of the main optical system 30. Therefore, according to the electronic camera of the first embodiment, when shooting with the two optical systems facing in the same direction, an image with a desired image quality can be obtained while preventing failures such as head breaks and poor composition. .

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described. The external appearance of the electronic camera in the second embodiment is common to the external view of the electronic camera of the first embodiment shown in FIG. 1, and the configuration is common to the block diagram of the electronic camera of the first embodiment shown in FIG. Duplicate explanation is omitted.

  Here, the relationship between the focal length and the angle of view will be described. In a general imaging lens, the relationship between the focal length and the angle of view is constant. Therefore, as shown in the first embodiment, if the focal length of the sub optical system 20 is adjusted in accordance with the focal length of the main optical system 30, the angle of view of the sub optical system 20 and the image of the main optical system 30 are adjusted. The ratio with the corner is a predetermined value. However, in an imaging lens equipped with a high-power zoom and an inner focus, the relationship between the focal length and the angle of view tends to be nonlinear due to optical characteristics. Therefore, the electronic camera 1 of the second embodiment adjusts the field angle of the sub optical system 20 in accordance with the field angle of the main optical system 30.

  FIG. 7 is a flowchart illustrating the operation of the control unit 27 during imaging in the electronic camera 1 of the second embodiment. The lens built-in memory 33 of the second embodiment records a table of field angle information of the main optical system 30 in addition to the lens information including the type of the interchangeable lens barrel. The table of view angle information stores data in which the positions of the focus adjustment lens and the zoom lens of the imaging lens 31 are associated with the view angle. The description will be made on the assumption that the relationship between the focal length and the angle of view of the sub optical system 20 is constant.

  In step S11 to step S12, the control unit 27 performs the same process as in step S1 to step S2 of FIG.

  In step S13, the control unit 27 reads the angle of view corresponding to the positions of the focus adjustment lens and the zoom lens of the imaging lens 31 adjusted in step S12 from the table of angle of view information recorded in the lens built-in memory 33.

  In step S <b> 14, the control unit 27 adjusts the angle of view of the sub optical system 20. For example, the control unit 27 controls the lens driving unit 22 so that the ratio between the field angle of the main optical system 30 and the field angle of the sub optical system 20 read in step S13 is a predetermined value. Adjust the position of 21. As in step S3 of FIG. 4, the ratio of the field angle of the sub optical system 20 and the field angle of the main optical system 30 is changed according to the type of the interchangeable lens barrel recorded in the lens built-in memory 33. Also good.

  FIG. 8 shows an example of changes in the angle of view of the sub optical system 20 and the main optical system 30 when the position of the zoom lens is moved from the telephoto side to the wide angle side. The zoom position is the position of the zoom lens. As shown in FIG. 8, the field angle of the sub optical system 20 and the field angle of the main optical system 30 are proportional. For example, assuming that the field angles of the sub optical system 20 at the zoom positions B1, B2, and B3 are As1, As2, and As3 and the field angles of the main optical system are Am1, Am2, and Am3, As1 / Am1 = As2 / Am2 = As3 / Am3. Similar to step S3 in FIG. 4, the imaging range of the sub optical system 20 is preferably approximately 10 to 20% wider than the imaging range of the main optical system 30 in the horizontal and vertical directions.

  In step S15 to step S18, the control unit 27 performs the same processing as in step S4 to step S7 in FIG.

  In the second embodiment, the example in which the relationship between the focal length of the sub optical system 20 and the angle of view is constant has been described. In this case, the electronic camera 1 includes a table of field angle information of the sub optical system 20 in advance in a memory (not shown) or the like. Then, the control unit 27 may adjust the field angle of the sub optical system 20 in accordance with the field angle information recorded in the field angle information table of the sub optical system 20 in step S14.

  Further, although an example in which field angle data is stored in the table of field angle information is shown, the present invention is not limited to this. For example, data that can calculate the angle of view of the main optical system 30 such as a focal length corresponding to the positions of the focus adjustment lens and the zoom lens of the imaging lens 31 may be used. In this case, in step S <b> 13, the control unit 27 may read data capable of calculating the field angle from the table of field angle information recorded in the lens built-in memory 33 and calculate the field angle of the main optical system 30.

  According to the electronic camera of the second embodiment, the same effect as that of the first embodiment can be obtained. In particular, according to the electronic camera of the second embodiment, it is possible to cope with a case where the relationship between the focal length and the angle of view of at least one of the sub optical system 20 and the main optical system 30 is nonlinear.

(Supplement of embodiment)
An example of changing the ratio of the focal length of the sub optical system 20 and the focal length of the main optical system 30 according to the type of the interchangeable lens barrel recorded in the lens built-in memory 33 in step S3 of the first embodiment. However, the present invention is not limited to this. For example, the ratio may be changed according to the shooting scene. For example, in the landscape mode, the ratio is reduced because there is a high possibility that the field angle of the main optical system 30 is wide. On the other hand, in the portrait mode, the ratio is increased. Further, a configuration may be adopted in which designation of a ratio from a user is received in advance via an operation button of the operation unit 39. In the second embodiment, the ratio of the angle of view of the sub optical system 20 and the angle of view of the main optical system 30 may be changed according to the shooting scene. It is also possible to adopt a configuration in which designation of the ratio from the user is received in advance.

  In the electronic camera 1 of the first embodiment and the second embodiment, the field angle of the main optical system 30 is narrower than the field angle of the sub optical system 20. Therefore, it is preferable that the number of pixels of the sub image sensor 23 is equal to or greater than the number of pixels of the main image sensor 34. The number of pixels may be set so that the pixel sizes of the sub image sensor 23 and the main image sensor 34 are the same. Further, the number of pixels may be limited in accordance with a display screen of a personal computer such as XGA (eXtended Graphics Array).

  In the electronic camera 1 of the first embodiment and the second embodiment, the optical axis of the sub optical system 20 and the optical axis of the main optical system 30 are preferably matched, but may not be matched. .

  In step S3 of the first embodiment, the focal length of the sub optical system 20 is adjusted so that the ratio between the focal length of the sub optical system 20 and the focal length of the main optical system 30 becomes a predetermined value. Not limited to this. For example, the focal length of the sub optical system 20 may be adjusted so that the field angle of the sub optical system 20 is widened in a quadratic function with respect to the field angle of the main optical system 30. The same configuration may be used in step S14 of the second embodiment.

  Moreover, although the example which records the data of the 1st main image and the data of the 2nd main image in the separate file of the recording medium 41 was shown in step S7 of 1st Embodiment, it is not restricted to this. For example, the first main image data and the second main image data may be recorded in the same file. The same configuration may be used in step S18 of the second embodiment.

  In the electronic camera 1 of the first embodiment and the second embodiment, the first main image captured by the sub image sensor 23 and the second main image captured by the main image sensor 34 can be compared with the display unit 38. And selection of any one of the main images may be received from the user via an operation button.

  Further, in the electronic camera 1 of the first embodiment and the second embodiment, the main optical system 30 is provided in the interchangeable lens barrel that can be removed from the camera body 10, but the present invention is not limited thereto. For example, the sub optical system 20 and the main optical system 30 may be provided in the interchangeable lens barrel, or only the sub optical system 20 may be provided in the interchangeable lens barrel.

  Further, although an electronic camera has been described as an example of the photographing apparatus of the present invention, the present invention can be similarly applied to other video cameras, mobile phones with cameras, and the like.

It is an external view of the electronic camera of 1st Embodiment. It is a block diagram which shows the structure of the electronic camera of 1st Embodiment. It is a figure which shows the example of the image acquired by each camera, when the lens of a main camera is zoomed to a telephoto side, and the lens of a subcamera is fixed to the wide angle side. It is a flowchart which shows operation | movement of the control part 27 at the time of the imaging in the electronic camera 1 of 1st Embodiment. It is a figure which shows the example of the focal distance change of the sub optical system 20 of 1st Embodiment, and the main optical system 30. FIG. It is a figure which shows the example of the imaging | photography range of the sub optical system 20 and the main optical system 30 of 1st Embodiment. It is a flowchart which shows operation | movement of the control part 27 at the time of the imaging in the electronic camera 1 of 2nd Embodiment. It is a figure which shows the example of the view angle change of the sub optical system 20 and the main optical system 30 of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic camera, 20 ... Sub optical system, 21 ... Imaging lens, 22 ... Lens drive part, 23 ... Sub image pick-up element, 27 ... Control part, 30 ... Main optical system, 31 ... Imaging lens, 32 ... Lens drive part, 33 ... Memory with built-in lens, 34 ... Main image sensor

Claims (7)

A first optical system for forming an image of a first subject ;
And angle adjusting unit for adjusting the angle of the previous SL first optical system,
A control unit that acquires lens information corresponding to the type of the interchangeable lens barrel from a memory built in the interchangeable lens barrel having a second optical system that forms an image of the subject including at least a part of the first subject; Including
The controller increases the angle of view of the first optical system as the angle of view of the second optical system increases, and decreases the angle of view of the first optical system as the angle of view of the second optical system decreases. And controlling the angle-of-view adjustment unit, and
When it is determined that the interchangeable lens barrel is a tele zoom lens based on the lens information, than when it is determined that the interchangeable lens barrel is a wide zoom lens based on the lens information, An imaging apparatus , wherein the field angle adjustment unit is controlled so that a value obtained by dividing the field angle of the first optical system by the field angle of the second optical system is increased . An imaging apparatus according to claim 1,
The control unit controls the angle- of-view adjustment unit so that the angle of view of the first optical system is wider than the angle of view of the second optical system. The imaging device according to claim 1 or 2,
The control unit controls the angle-of-view adjustment unit so that a ratio of an angle of view of the first optical system and an angle of view of the second optical system becomes a predetermined value. It is an imaging device given in any 1 paragraph of Claims 1-3,
The control unit controls the angle-of-view adjustment unit so that a ratio of a focal length of the first optical system and a focal length of the second optical system becomes a predetermined value. It is an imaging device given in any 1 paragraph of Claims 1-4,
A recording unit that records information about an angle of view of at least one of the first optical system and the second optical system;
The imaging device according to claim 1, wherein the control unit controls the angle-of-view adjustment unit according to information on the angle of view recorded in the recording unit. An imaging apparatus according to any one of claims 1 to 5, wherein
A first image sensor that photoelectrically converts an image of the first subject formed by the first optical system;
A second image sensor that photoelectrically converts the image of the subject formed by the second optical system;
The number of pixels of the second image sensor is smaller than the number of pixels of the first image sensor . The imaging device according to claim 6,
First and second image processing units that individually perform signal processing after conversion into digital signals using image signals obtained from the first image sensor and image signals obtained from the second image sensor An imaging apparatus characterized by that.

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