JP2009290816A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera for displaying an image corresponding to a simulated lens which a user desires, without exchanging a taking lens. <P>SOLUTION: The camera includes a display portion 69 for displaying an image by an image pick-up signal output from an imaging element 61 for imaging an object through an exchangeable taking lens 4, an identification information acquisition portion 64 for acquiring identification information for the taking lens 4, a storage portion 63 for storing lens information on taking lenses 4 and simulated lenses, a selecting portion 67 for selecting a simulated lens, and an image processing portion 65 which refers to lens information on the taking lens 4 which the identification information obtained by the acquisition portion 64 represents, and lens information on the simulated lens selected by the selecting portion 67, which are stored in the storage portion 63, and applies image processing to the image to be displayed on the display portion 69, so as to be an image to be obtained when the object is imaged with the imaging element 61 through the simulated lens selected by the selecting portion 67. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a camera.

  In recent years, cameras capable of displaying a through image of a subject via a photographing lens have become widespread, and a user can photograph a subject under optimum photographing conditions while confirming the displayed through image.

A camera having a through image display function is disclosed in Patent Document 1 and Patent Document 2 below. The camera described in Patent Document 1 displays focal length information together with a through image when the photographing lens is zoomed. The camera described in Patent Document 2 generates and displays an image that matches the image size of the lens after the replacement with respect to the through image that has passed through the replaced lens, and displays a focus detection area corresponding to the image size. Information to be displayed is also displayed.
JP 63-195639 A JP 2004-212892 A

  By the way, in the case of a conventional interchangeable lens camera having a through image display function, an image after replacement cannot be confirmed unless the photographing lens is replaced and another photographing lens is mounted on the camera body. Therefore, in order to check the image of the subject when the lens is replaced, it is necessary to replace the photographing lens each time.

  An object of the present invention is to provide a camera capable of displaying an image corresponding to a simulated lens desired by a user without replacing a photographing lens.

  A camera according to the present invention includes a display unit that displays an image based on an imaging signal output from an imaging element that captures an image of a subject via an interchangeable imaging lens, and an identification information acquisition unit that acquires identification information of the imaging lens. The identification information acquired by the identification information acquisition unit stored in the storage unit that stores lens information of the photographing lens and the simulated lens, the selection unit that selects the simulated lens, and the storage unit is stored in the storage unit. The simulation selected by the selection unit with respect to the image displayed on the display unit with reference to the lens information of the photographing lens shown and the lens information of the simulation lens selected by the selection unit An image processing unit that performs image processing so that the subject is captured by the image sensor through a lens.

  According to the present invention, it is possible to display an image of a subject imaged through a photographing lens so as to be an image when the simulated lens is attached to the camera, simply by selecting the simulated lens.

  Hereinafter, a camera according to an embodiment of the present invention will be described. FIG. 1 is a block diagram illustrating a configuration of a camera according to the present embodiment. As shown in the figure, the camera 2 includes an interchangeable photographic lens 4 and a camera body 6. The photographing lens 4 includes a CPU 40, a lens driving unit 41, a lens position detection unit 42, a communication unit 43, and a lens 44 that is configured by a plurality of lens groups and is movable in the optical axis direction. The CPU 40 includes a ROM and a RAM memory, and the ROM stores information for identifying the photographic lens, and controls each part constituting the photographic lens 4.

  The lens driving unit 41 moves the lens 44 in the optical axis direction, and the lens position detection unit 42 includes an encoder or the like, and detects the lens position of the lens 44 moved by the lens driving unit 41. The communication unit 43 transmits lens information including the focal length at the lens position of the lens 44 and identification information for identifying the photographing lens 4 (hereinafter referred to as “photographing lens information”) to the camera body 6.

  The camera body 6 includes a CPU 60, an image sensor 61, an image data storage unit 62, a lens information storage unit 63, a communication unit 64, an image processing unit 65, a memory card 66, an operation unit 67, a display control unit 68, and a display unit 69. It is configured to include. The CPU 60 includes a ROM or RAM memory, and controls each part of the camera body 6 by executing a program stored in the ROM.

  The image sensor 61 is configured by a CCD, a CMOS, or the like, and generates an analog image signal by capturing an image of a subject through the photographing lens 4. The image data storage unit 62 temporarily stores image data generated by A / D converting the image signal output from the image sensor 61 in an A / D conversion unit (not shown). The lens information storage unit 63 stores lens information such as the focal length and F value of the photographic lens 4 and an interchangeable lens (hereinafter referred to as “simulated lens”) other than the currently mounted photographic lens. The communication unit 64 communicates photographing lens information and the like with the photographing lens 4.

  The image processing unit 65 reads out image data stored in the image data storage unit 62 in units of frames, and performs interpolation processing or the like to generate a through image. In addition, the image processing unit 65 performs image processing for displaying the simulated image when the simulated lens is attached to the data of the through image.

  The memory card 66 is composed of an SD card or the like, and stores image data such as RAW data and JPEG data. The operation unit 67 is a shutter button (not shown), an operation button for menu selection, and the like, and selects a mode for displaying a through image when a simulated lens is attached (hereinafter referred to as “simulated image display mode”). Accepts operations and simulated lens selection operations. The display control unit 68 controls display of the through image and the image stored in the memory card 66 on the display unit 69. The display unit 69 includes a liquid crystal display provided on the back surface of the camera body 6 and displays images such as a through image and menu items.

  FIG. 2 shows a configuration and data example of a lens information table stored in the lens information storage unit 63. As shown in the figure, the lens information table 10 stores the focal length, F value, and resolution of each simulated lens including the photographing lens 4 indicated by the lens identification information.

  FIG. 3 shows a display example of the lens selection menu displayed on the display unit 69. The lens selection menu is displayed on the display unit 69 when the user performs a simulated image display mode selection operation via the operation unit 67. That is, the selected lens information 210 including the lens identification information, the focal length, and the F-number data in the lens information table 10 described above is displayed, and is mounted so that the user can check the mounted photographing lens 4. The selected lens information 220 of the photographing lens 4 is displayed with emphasis, for example, by surrounding it with a rectangle.

  Next, the operation of the camera 2 according to the present embodiment will be described with reference to an operation flowchart shown in FIG. When the CPU 60 of the camera 2 receives a selection operation of the simulated image display mode from the user via the operation unit 67 (step S110: Y), as shown in FIG. 3, the CPU 60 displays the display unit 69 via the display control unit 68. Displays the lens selection menu.

  Here, when the user selects the selected lens information 230 of “lens B” as a simulated lens via the operation unit 67, the CPU 60 accepts the selection operation (step S120: Y), and the lens identification information and the information from the photographing lens 4 are received. Shooting lens information including the focal length defined by the lens position is acquired via the communication unit 64 (step S130). In this embodiment, it is assumed that “lens A” is acquired as the identification information of the currently mounted photographing lens, and the focal length “18 mm” is acquired as the current lens position of the lens A.

  The CPU 60 refers to the lens information table 10 stored in the lens information storage unit 63 and outputs from the image sensor 61 image processing for generating a simulated image when the lens B is mounted by the image processing unit 65. The through image data based on the imaging signal is performed for each frame (step S140).

  FIG. 5 is a diagram illustrating an operation flow of the image processing in step S140. The image processing unit 65 refers to the lens information table 10 stored in the lens information storage unit 63 and determines the lens based on the focal length defined by the lens information of the lens A, the lens information of the lens B, and the lens position of the lens A. The magnification of the simulated image when B is worn is calculated (step S141).

  FIG. 6 is a diagram illustrating the magnification of the image data calculated based on the lens position (set focal length) of the lens A when the focal length of the lens B is associated with the focal length of the lens A. Since the lens A is a zoom lens with a focal length of 18-55 mm, and the lens B is a zoom lens with a focal length of 55-200 mm, when the lens B is simulated with the lens A attached, the focal length of the lens A The focal length of lens B corresponds to 55 mm, and the focal length of lens A corresponds to 55 mm.

  In this case, when displaying an image of the lens B with a focal length of 55 mm, it is necessary to multiply the image data of the lens A with a focal length of 18 mm by 3.05 (= 55/18). Is displayed, it is necessary to multiply the image data of the lens A at the focal length of 55 mm by 3.636 (= 200/55). The magnification of the lens A with respect to image data at each lens position is calculated by substituting lens position information indicating the focal length of the lens A into a linear function indicated by a straight line 600 in FIG. In the case of the embodiment, since the lens position of the lens A is 18 mm, the magnification for the image data is 3.05 times.

  Returning to FIG. 5, the image processing unit 65 extracts part of the image data from the through image data for one frame so as to obtain the image with the magnification calculated in step S <b> 141, and calculates the extracted through image data. The image is enlarged at a magnification (step S142). Further, the image processing unit 65 refers to the lens information table 10 stored in the lens information storage unit 63, and for the image data enlarged in step S142, the open F value “4” of the lens A and the open F value of the lens B. The brightness is adjusted according to the difference of “2.8” (step S143). In this case, since the lens B is a brighter lens than the lens A, the lens B is adjusted so as to be brighter than the through image of the lens A.

  Further, the image processing unit 65 refers to the lens information table 10 stored in the lens information storage unit 63, and for the image data enlarged in step S142, the resolution “90” of the lens A and the resolution “100” of the lens B. The resolution is adjusted according to the difference (step S144).

  Returning to FIG. 4, the CPU 60 causes the display control unit 68 to display the image data processed in step S140 and the lens information indicating the focal length and F value of the lens B in the lens information table 10 on the display unit 69 ( Step S150). FIG. 8 shows an example of a through image through the lens A at a lens position with a focal length of 18 mm. FIG. 9 is a table of images when the lens B is a simulated lens and the lens position is the same as the lens A. An example is shown. In FIG. 9, a simulated image 410 obtained by performing image processing on the through image data of the portion surrounded by a broken line 310 in FIG. 8, lens information 420 indicating identification information, focal length, and F value of the selected lens B, Are also displayed on the display unit 69. In the above-described steps S140 and S150, the processing for one frame has been described. However, the same processing is performed for each frame until the simulated image display mode is ended, and the display of the through image is continuously performed.

  Returning to FIG. 4, the CPU 60 determines whether or not the operation for ending the simulated image display mode via the operation unit 67 has been received. When the CPU 60 has not received the operation for ending the simulated image display mode (step S160: N), step S120 is performed. The following process is repeated. If the user performs an operation to change the lens position of the mounted photographic lens, the photographic lens information is acquired (step S130), and the magnification corresponding to the focal length specified by the changed lens position. Are displayed (steps S140 and S150).

  In addition, when the CPU 60 receives an operation for ending the simulated image display mode via the operation unit 67 (step S160: Y), and when the CPU 60 does not accept the selection operation for the simulated image selection mode via the operation unit 67 in step S110 ( In step S110: N), a through image (FIG. 8) of the subject imaged through “lens A” is displayed on the display unit 69 (step S170).

  The camera according to the present embodiment can display the image data captured by the photographing lens by performing image processing so that an image obtained when the simulated lens is mounted can be obtained simply by selecting a replaceable simulated lens. Therefore, the user can easily check the simulated image corresponding to the simulated lens without performing an operation to replace the lens, and even if the user does not have an interchangeable lens, the interchangeable lens can be obtained before purchase. The image can be confirmed when an interchangeable lens other than the above is used.

  In the above-described embodiment, the magnification of the image data is calculated by associating the focal length of the photographing lens with the focal length of the selected lens, and an image enlarged at the calculated magnification is displayed. The following cases are also included in the present invention. For example, when the photographic lens mounted is the lens A and the selected simulated lens is the lens C single-focus lens, the lens position of the lens A is set to the focal length 55 mm on the most telephoto side as shown in FIG. When this is done, a simulated image when the lens C is attached to the display unit 69 is displayed. That is, the through image data is enlarged with the ratio of the focal length 55 mm of the lens A and the focal length 400 mm of the lens C as a magnification of 7.27 (= 400/55). The resolution is adjusted, and the simulated image 510 and the lens information 520 representing the lens C are combined into the display unit 69 as shown in FIG. In this case, as shown in FIG. 7, until the lens position of the lens A is set to a focal length of 55 mm, a through image captured through the lens A may be displayed, or the lens position of the lens A is in focus. You may make it not display an image on the display part 69 until it sets to the position which shows distance 55mm.

  In the above-described embodiment, the display unit 69 is described as a liquid crystal display, but may be an electronic viewfinder.

  In the above-described embodiment, the case where the selected lens is a lens having a longer focal length than the photographic lens to which the selected lens is attached has been described. However, when the selected lens is a lens having a wider angle than the photographic lens to which the selected lens is attached. As in the above-described embodiment, the magnification of the image data is calculated using the focal length of the selected lens corresponding to the focal length of the mounted photographic lens, and the image reduced by the calculated magnification is displayed on the display unit. It may be displayed in the center of the image display area.

  In addition, if the performance of the selected simulation lens is worse than that of the photographic lens, image processing with reduced image quality is performed according to the difference in performance between the simulation lens and the photographic lens. It is good also as going and displaying.

  In the above-described embodiment, the focal length, the F value, and the resolution are used as the lens information. However, chromatic aberration information may be used. For example, when information on whether or not an ED (Extra Low Dispersion) lens is stored in the lens information table as chromatic aberration information, the mounted photographing lens is an ED lens, and the selected simulated lens is When the lens is not an ED lens, a simulated image is generated by performing image processing so as to blur the image of the attached photographing lens according to chromatic aberration.

  In the above-described embodiment, in the image processing for displaying the simulated image, the brightness of the image data of the mounted shooting lens is adjusted according to the difference between the open F value of the shooting lens and the simulated lens. As described above, the degree of blur may be adjusted by image processing with respect to the image by the photographing lens so as to represent the change in the depth of field according to the difference in the F value.

  Also, in the simulated image display mode, the simulated image display corresponding to the lens selected as the simulated lens is performed, but the simulated image display was changed without specifying the simulated lens, and shooting was performed with a lens that can be worn. Displays the name and focal length of the corresponding simulated lens when the image size is the same size as, while if there is no mountable lens corresponding to the image size, displays that there is no corresponding simulated lens. You may do it.

It is a block diagram of the camera concerning an embodiment. It is a figure which shows the example of the lens information table which concerns on embodiment. It is a figure which shows the example of the lens selection menu image which concerns on embodiment. It is a flowchart which shows operation | movement of the camera which concerns on embodiment. It is a flowchart which shows the operation | movement of the image processing of the camera which concerns on embodiment. It is a figure explaining the magnification of the simulation picture of the camera concerning an embodiment. It is a figure explaining the magnification of the simulation picture of the camera concerning the modification of an embodiment. It is a figure which shows the example of a display of the image image | photographed through the imaging lens of the camera which concerns on embodiment. It is a figure which shows the example of a display of the simulation image at the time of selecting the simulation lens B in embodiment. It is a figure which shows the example of a display of the simulation image at the time of selecting the simulation lens C in embodiment.

Explanation of symbols

2 Camera 4 Lens 6 Camera body 40, 60 CPU
DESCRIPTION OF SYMBOLS 41 Lens drive part 42 Lens position detection part 43, 64 Communication part 61 Image pick-up element 62 Image data storage part 63 Lens information storage part 65 Image processing part 66 Memory card 67 Operation part 68 Display control part 69 Display part

Claims (7)

A display unit for displaying an image based on an imaging signal output from an imaging element that images a subject via an interchangeable imaging lens;
An identification information acquisition unit for acquiring identification information of the photographing lens;
A storage unit for storing lens information of the photographing lens and the simulated lens;
A selection unit for selecting the simulated lens;
With reference to the lens information of the photographic lens indicated by the identification information acquired by the identification information acquisition unit and the lens information of the simulated lens selected by the selection unit, stored in the storage unit, An image processing unit that performs image processing on the image displayed on the display unit such that the subject is captured by the imaging element through the simulated lens selected by the selection unit; ,
A camera comprising: A lens position information acquisition unit for acquiring lens position information of the photographing lens;
The lens information includes focal length information indicating focal lengths of the photographing lens and the simulated lens,
The image processing unit is based on the lens position information acquired by the lens position information acquisition unit, the focal length information of the photographing lens included in the lens information, and the focal length information of the simulated lens. The camera according to claim 1, wherein the displayed image is enlarged or reduced. The lens information includes information indicating the brightness of each of the photographing lens and the simulated lens,
The image processing unit changes the brightness of the image displayed on the display unit based on information indicating the brightness of the photographing lens and information indicating the brightness of the simulated lens included in the lens information. The camera according to claim 1, wherein the camera is performed. The lens information includes information indicating the resolution of each of the photographing lens and the simulated lens,
The image processing unit changes the resolution of the image displayed on the display unit based on resolution information of the photographing lens and resolution information of the simulated lens included in the lens information. The camera according to any one of claims 1 to 3.   The camera according to claim 1, wherein information indicating the selected simulated lens is displayed on the display unit.   The camera according to claim 1, wherein the display unit is an electronic viewfinder.   The camera according to claim 1, wherein the display unit is a liquid crystal display unit disposed on a back surface of the camera body.

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