JP2006157189A - Camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera system in which an object is displayed on a display screen even when a camera head incapable of signal transform processing with the signal processing capacity of camera is attached, and the display screen can be used in place of a finder. <P>SOLUTION: When a camera head of such type as incapable of signal transform processing is attached, a digital signal transform section on the camera body side displays a monochrome image based on RAW data. The digital signal transform section performs pixel number adjusting processing or pixel number matching processing for matching the aspect ratio or the number of pixels in the imaging region of the CCD in a camera head to the aspect ratio or the number of pixels on the display screen and displays a through image on the display screen of an LCD 1050b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera system including a camera head including a photographing optical system and an image sensor, and a camera body that communicates with the camera head, receives an image signal from the camera head, and performs signal conversion processing.

  When a plug-in unit in which an image sensor and a photographing optical system are integrated is attached to the camera body, information on the plug-in unit is transmitted to the camera body side, and photographing is performed with the photographing optical system included in the plug-in unit. A camera system has been proposed (see Patent Document 1). When a camera system that replaces the photographic optical system, that is, the photographic lens, is realized simply by attaching the plug-in unit to the camera body, the handling of the camera system becomes very simple, and specialized knowledge can be obtained. Even people who do not have it can easily change the photographic lens.

  Similarly, there is a camera system including a camera head including a photographing optical system and an image sensor, and a camera body that is detachably mounted and receives an image signal from the camera head and performs signal conversion processing ( For example, see Patent Document 2).

  However, in both the specifications of Patent Document 1 and Patent Document 2, a process in the case where the signal conversion process cannot be performed on the image signal received from the camera head on the camera body side by the capability of the signal processing unit of the camera body is described. It has not been.

When camera systems such as those mentioned above have become widespread, the camera head and camera body may be sold separately, so make sure that each is a compatible model. In some cases, you may notice that it is non-conforming only after you attach it to the camera body. Recently, in addition to R, G, B, there is also a camera head equipped with an image sensor having a special CFA (Color Filter Array) having a color scheme of emerald green, and such a camera head is mounted on the camera body. In some cases, the signal conversion processing cannot be performed with the capability of the signal processing unit of the camera body. In such a case, even if the camera system is set up to perform shooting, signal conversion processing cannot be performed in the camera body, so conversion to an image signal for display cannot be performed, and the display screen is normally displayed. The subject that should be displayed on is no longer displayed. If a direct view type finder is provided on the camera body side of such a camera system, it is not possible to take a picture when looking through the finder, but it is inconvenient to take a picture if the subject is not displayed on the display screen. .
JP-A-8-172561 JP 2000-175089 A

  In view of the above circumstances, the present invention can display a subject on a display screen even when a camera head that cannot perform signal conversion processing is mounted on the camera body, and can use the display screen instead of a finder when shooting. The purpose is to provide a system.

The camera system of the present invention that achieves the above object includes a camera head having a photographing optical system and an image sensor, and a camera body that is detachably mounted and receives a signal signal from the camera head and performs signal conversion processing. In a camera system with
The camera body is
A type recognition unit for recognizing the type of camera head mounted on the camera body;
Whether the camera body is capable of performing signal conversion processing for converting an image signal received from a camera head of a type recognized by the type recognition unit into an image signal composed of a luminance signal and a chromaticity signal. A determination unit for determining whether or not
A signal processing unit that performs the signal conversion process on an image signal received from a type of camera head that is determined to be capable of the signal conversion process by the availability determination unit;
An image that includes a display screen on which an image is displayed, and that has been subjected to the signal conversion processing by the signal processing unit, depending on whether or not it is determined by the availability determination unit that the signal conversion processing is performed. And an image display unit for displaying on the display screen an image based on the signal and an image signal from which the signal conversion processing in the signal processing unit is omitted.

  According to the camera system of the present invention, based on the image signal in which the signal conversion process is not performed by the image display unit upon receiving the determination that the signal conversion process is impossible by the availability determination unit. An image is displayed on the display screen.

  Then, even if a camera head that cannot perform signal conversion processing is mounted on the camera body, the subject captured by the imaging optical system of the camera head is displayed on the display screen and the display screen is used instead of the viewfinder A camera system is realized.

  When a shooting operation is performed using the display screen instead of the viewfinder, the image signal without the signal conversion process may be recorded on the memory card as it is.

Here, the imaging device includes a color separation filter,
The determination unit determines whether the signal conversion is performed when the color separation filter included in the image sensor of the camera head mounted on the camera body is a filter array that cannot perform the signal conversion process in the signal processing unit. Even if it is determined that processing is impossible,
In addition, the image sensor includes a color separation filter,
When the color separation filter included in the image sensor of the camera head mounted on the camera body is a filter having a color that cannot be subjected to the signal conversion processing by the signal processing unit, It may be determined that the conversion process is impossible.

In addition, when the determination unit determines that the mounted camera head is a type of camera head that cannot perform the signal conversion processing by the signal processing unit, and the image sensor of the camera head has When the number of vertical and horizontal pixels does not match the number of vertical and horizontal pixels of the display screen,
The signal processing unit performs a pixel number adjustment process for adjusting the number of pixels by mixing adjacent pixels without performing the signal conversion process.
Preferably, the image display unit displays an image based on the image signal after the pixel number adjustment processing on the display screen.

  Then, even when the number of vertical and horizontal pixels of the image sensor of the camera head does not match the number of vertical and horizontal pixels of the display screen, an image based on the image signal after the pixel number adjustment processing by the image display unit is displayed on the display screen. Displayed above.

In addition, when the determination unit determines that the mounted camera head is a type of camera head that cannot perform the signal conversion processing by the signal processing unit, the aspect of the imaging region of the imaging element Ratio and the aspect ratio of the display screen are different,
The signal processing unit matches the number of vertical pixels on the image signal obtained by the image sensor to the number of vertical pixels on the display screen, or sets the number of horizontal pixels on the image signal to A process for matching the number of pixels to match the number of pixels,
The image display unit preferably displays an image based on the image signal after the pixel number matching processing on the display screen.

  Then, even when the aspect ratio of the imaging region of the imaging device is different from the aspect ratio of the display screen, an image based on the image signal after the pixel number adjustment processing is performed by the pixel number adjustment processing in the signal processing unit is described above. Displayed by the image display unit.

The signal processing unit further performs a masking process to fill the area with a predetermined color when an area where no image appears on the display screen by performing the pixel number matching process. ,
The image display unit preferably displays an image based on the image signal after the masking process on the display screen.

  Then, even if the number of pixels of the image sensor and the number of pixels of the display screen, the aspect ratio of the image sensor and the aspect ratio of the display screen, and the like are different, the signal processing unit performs pixel number matching processing including masking processing. An image based on the applied image signal is displayed neatly on the display screen.

In addition, when the mounted camera head is determined to be a type of camera head that cannot perform the signal conversion processing by the signal processing unit, and one pixel of the image signal obtained by the imaging device When the number of gradations per pixel of the image signal handled by the image display unit is smaller than the number of gradations per area,
The signal processing unit performs gradation number conversion processing for converting the image signal obtained by the image sensor into the number of gradations that can be displayed on the image display unit without performing the signal conversion processing. ,
The image display unit preferably displays an image based on the image signal after the gradation number conversion process.

  Then, in addition to the number of pixels of the image sensor and the number of pixels of the display screen, the aspect ratio of the image sensor and the aspect ratio of the display screen, the number of gradations per pixel in the image signal obtained by the image sensor Even if the number of gradations per pixel of the image signal handled by the image display unit is different, an image based on the image signal subjected to gradation conversion processing by the signal processing unit is displayed on the display screen by the image display unit. Displayed above.

  Thus, the difference between the specification of the image sensor and the specification of the display screen is eliminated by the processing of the signal processing unit, and the image based on the image signal is always displayed by the image display unit.

Further, when it is determined that the mounted camera head is a type of camera head that cannot perform the signal conversion processing in the signal processing unit,
The signal processing unit performs γ correction processing according to the image signal obtained by the image sensor,
The image display unit preferably displays an image based on the image signal after the γ correction process is performed.

  Then, γ correction processing according to the image signal obtained by the image sensor is performed by the signal processing unit, and an image based on the image signal subjected to γ correction processing is displayed on the display screen by the image display unit.

  Further, each of the image display units is an image signal that has been subjected to the signal conversion processing by the signal processing unit, depending on whether or not it is determined by the availability determination unit that the signal conversion processing is performed. When the image based on the image signal without the signal conversion processing in the signal processing unit is displayed on the display screen and the image based on the image signal without the signal conversion processing is displayed, the mounted camera head It is preferable to display a warning indicating that is incompatible.

  Then, a warning is displayed that the mounted camera head is incompatible, and the user is notified that the camera head cannot perform signal conversion processing in the signal processing unit. Upon receiving this notification, the user can replace the incompatible camera head with a compatible camera head, or use the incompatible camera as it is and take the picture with the knowledge that it is incompatible. Can also be performed.

   As described above, a camera system is realized in which a subject is displayed on a display screen and the display screen can be used instead of a viewfinder even when a camera head that cannot perform signal conversion processing is mounted on the camera body.

  Embodiments of the present invention will be described below.

  FIG. 1 is a diagram showing a camera system according to an embodiment of the present invention.

  As shown in FIG. 1, the camera system 1 of this embodiment includes a camera head 1a and a camera body 1b. FIG. 1 shows a camera head 1a having a photographic optical system and an image sensor, and a camera body 1b to which the camera head 1a is detachably attached and receives an image signal from the camera head 1a and performs signal conversion processing. ing.

  The appearance of the camera head 1a is the same as that of a conventional interchangeable lens.

  In the center of the camera body 1b, a head mount 10b having a large number of mount contacts is provided. A similar mount portion is also formed on the camera head 1a side, and when the camera head 1a is mounted on the camera body 1b along the alternate long and short dash line in the drawing so that the positions of both mount contacts match, The mount contacts are connected to each other, and the camera head 1a and the camera body 1b are electrically connected.

  Each of the mount contacts is assigned for communication and power supply, and communication from the camera body 1b to the camera head 1a is performed, or from the camera head 1a to the camera body 1b. In addition, power is supplied from the camera body 1b side to the camera head 1a side.

  An AWB sensor 11b is provided above the head mount 10b, and a light source type at the time of photographing is detected by the AWB sensor 11b. The light source type is, for example, whether it is sunlight or a fluorescent lamp. This light source type is detected by an AWB sensor, and an appropriate color temperature is set in a digital signal processing unit to be described later. White balance is adjusted. A flash light emission window 12b is provided beside the AWB sensor 11b, and a flash light emission device that emits flash light through the flash light emission window 12b is provided in the camera body 1b. Further, a release button 13b and a mode dial 14b are provided on the upper surface of the camera body 1b. The mode dial 14b selects a shooting mode and a playback mode. In the shooting mode, a still image shooting mode or a moving image shooting mode is further selected. In FIG. 1, one of a plurality of camera heads is shown as an example, and one of a plurality of main bodies is shown as an example. On the back side, an operator group including a menu button, a display screen of the LCD 1050b, and the like are arranged.

  Here, the internal configuration of the camera head 1a and the camera body 1b will be described with reference to FIG.

  FIG. 2 is a block diagram showing the configuration of the electrical system when the camera head 1a is mounted on the camera body 1b.

  The configuration of the camera head 1a is shown on the upper side of FIG. 2, and the configuration of the camera body 1b is shown on the lower side of FIG.

  First, the configuration on the camera head 1a side will be described.

  The camera head 1a constituting the camera system 1 of the present embodiment is mounted on the camera body 1b and operates by receiving power supply from the battery Bt on the camera body 1b side, and controls the power supply on the camera head 1a side. Since the unit 100a and the DC / DC converter 101a are controlled by the power control unit 140b on the camera body 1b side, the configuration of the power control unit 100a on the camera head 1a side and the DC / DC converter 101a is on the camera body 1b side. The configurations of the power supply control unit 140b and the DC / DC converter 141b will be described together.

  As shown in FIG. 2, a camera head 1a constituting the camera system 1 is provided with a photographing optical system 11a and an image pickup device (hereinafter referred to as a CCD because a CCD solid-state image pickup device is used) 12a. . In the photographing optical system 11a, a photographing lens, a diaphragm and the like are provided. The subject is imaged on the CCD 12a by the photographing lens in the photographing optical system 11a, and image data is generated by the CCD 12a. The image data generated by the CCD 12a is output to the analog signal processing unit 13a and subjected to noise reduction processing by the analog signal processing unit 13a. Then, the analog signal image signal is converted into a digital signal by the A / D unit 14a at the subsequent stage. The image signal is converted to a high-speed serial driver 150a. The digital image signal is transmitted to the main body of the camera 1b by the high-speed serial bus driven by the high-speed serial driver 150a. Of course, the high-speed serial driver 150b for driving the high-speed serial bus is also provided on the camera body 1b side, and the high-speed serial bus is driven by both drivers. Among the image signals supplied to the camera body 1b through the high-speed serial bus, the subject captured by the photographing lens in the photographing optical system when any photographing mode is selected by the mode dial 14b. Is displayed when the image signal for a through image (hereinafter referred to as a through image signal) for displaying the image on the display screen (not shown) of the LCD 1050b or the still image shooting mode in the shooting mode is selected. An image signal representing a still image obtained by operating the button 13b (hereinafter referred to as a still image signal) or an image representing a moving image obtained by operating the release button 13b when the moving image mode in the shooting mode is selected. There are three types of image signals: signals (hereinafter referred to as moving image signals). Any one of these image signals is transmitted to the camera body through the high-speed serial bus in response to a request from the camera body 1b.

  On the other hand, the image signal converted into a digital signal by the A / D unit 14a is also supplied to an integration circuit 16a provided at a subsequent stage of the A / D unit 14a. The integration circuit 16a performs an AF function (hereinafter referred to as AF) and an AE function (hereinafter referred to as AE). The integration circuit 16a uses the integration circuit 16a to measure the field luminance and activate the AF function. The subject distance is measured. The subject distance and the field luminance measured by the integrating circuit 16a are supplied to the aperture / focus / zoom control unit 17a via the data bus 192a, and the aperture / focus / zoom control unit 17a uses the aperture in the photographing optical system. Or the position of the focus lens in the photographing optical system is adjusted. In this way, each time the lens in the photographic optical system provided in the camera head 1a is directed to a different subject, AF and AE are activated and the focus and brightness are adjusted immediately to represent the subject in focus. Data is generated by the CCD 12a and output from the CCD 12a.

  The CCD 12a, the analog signal processing unit 13a, the A / D unit 14a, and the integrating circuit 16a operate in synchronization with a timing signal from a timing generator (hereinafter referred to as TG) 18a. The operation of the TG 18a is performed by the head CPU 19a. It is controlled. The head CPU 19a controls the TG 18a, the aperture / focus / zoom control unit 17a and the like according to the procedure of a program stored in the system memory 190a. The system memory 190a includes AE and AF. A program indicating a processing procedure and a processing procedure related to communication via a serial bus is stored. In this program, a shooting mode is selected by the mode dial, and a through image processing program, a still image processing program, and a moving image shooting mode that are activated when the still image shooting mode is selected are selected. A video processing program that is sometimes started is also stored. According to these processing procedures, the operation of the integrating circuit 16a, the operation of the TG 18a, the read / write operation of the nonvolatile memory 191a, the operation of the 3-wire serial driver 151a, the operation of the high-speed serial driver 150a, etc. are all controlled by the head CPU 19a. .

  Further, the nonvolatile memory 191a stores the ID information for identifying the camera head and the signal conversion processing information necessary for the signal conversion processing in the camera body 1b of the image signal passed from the camera head 1a to the camera body 1b. If a command representing a request for transmitting such information is transmitted from the camera body 1b via the 3-wire serial bus, only the ID information in the nonvolatile memory 191a or the ID information and signal Both the conversion processing information and the conversion processing information are transmitted to the camera body 1b via the 3-wire serial bus. A 3-wire serial driver 151b for driving a 3-wire serial bus is also provided on the camera body 1b side, and the camera body 1b to the camera head 1a or the camera head 1a to the camera body by a serial bus driven by both drivers. A command is exchanged to 1b. For example, when a command requesting transmission of ID information from the camera body 1a to the camera head 1b is transmitted, ID information or signal conversion is performed from the camera head 1a to the camera body 1b via the 3-wire serial bus according to the command. When processing information is transmitted and a command corresponding to a request for transmission of an image signal is transmitted from the camera body 1b by communication, the image converted into a digital signal by a high-speed serial bus faster than the 3-wire serial bus A signal is transmitted to the camera body 1b.

  Here, apart from FIG. 2, the contents of the ID information and signal conversion processing information stored in the nonvolatile memory 191a will be described with reference to FIGS.

  FIG. 3 is a diagram showing ID information and signal conversion processing information, and FIG. 4 is a diagram showing an image pickup surface of the CCD 12a and explaining the meaning of the signal conversion processing information of FIG.

  ID information is shown at the top of FIG. 3, and signal conversion processing information is shown below the ID information. The ID information shown in FIG. 3 is, for example, an ID number for identifying the camera head. This ID number is downloaded to the camera body when the head is mounted, and what type of camera head is mounted on the camera body. Is recognized by the body CPU 100b (see FIG. 2) on the camera body side. The signal conversion processing information shown in FIG. 3 is what the camera head 1a has. However, in this embodiment, the camera body 1b also has the signal conversion processing information shown in FIG. If there is signal conversion processing information corresponding to the ID information when the information is downloaded, the signal conversion processing information is set in the digital signal processing unit 103b. That is, if the ID information is on the camera body side, it is not necessary to bother to download the signal conversion processing information from the camera head 1a.

  However, since storing all ID information and signal conversion processing information is inefficient in view of the memory capacity of the camera body, the signal conversion processing information shown in FIG. 3 is downloaded from the camera head. I can do it.

  The signal conversion processing information includes, in order from the top, the CFA array of the CCD 11a, the number of pixels of the CCD 11a (in the case of a still image, in the case of a through image, and in the case of a moving image), the coordinates indicating the effective capture position, and the number of pixels. In addition, coordinates indicating the position of optical black (hereinafter referred to as OB) serving as a reference for the black level, component order, A / D bit depth, CCD scratch position, and the like are shown.

  In the signal conversion processing information shown in FIG. 3, the number of pixels is indicated by a combination (W, H) of the number W of vertical pixels and the number H of horizontal pixels. As shown in FIG. 4, (W, H) indicates the number of pixels in the horizontal direction and the number of pixels in the vertical direction, and the maximum number of pixels in the width direction of the imaging surface is indicated by the reference symbol H1. The maximum number of pixels in the height direction of the imaging surface is shown. That is, in the case of (W1 H1), it is shown as one of the signal conversion processing information that a still image signal is generated by using all the pixels of the CCD 12a. Further, the through image signal is generated with a smaller number of pixels (W2 H2) than the number of pixels of the still image signal (W1 H1), and the number of pixels of the moving image signal is also smaller than the number of pixels of the still image signal (W1 H1). It is shown as one of the signal conversion processing information that it is generated by (W3 H3). In addition, the coordinates of the effective capturing position of the through image signal, the moving image signal, etc. are indicated by (XY), and the number of pixels in the effective capturing area (area indicated by the dotted line in the figure) is indicated by a combination of (W4, H4). Has been.

  Further, an area called optical black (hereinafter referred to as OB) is provided on the image pickup surface of the CCD 12b for informing the digital signal processing unit 103b on the camera body 1b side of the black level when the image is taken by the CCD 12b. The start coordinates (XOB) and length (WOB) of this OB area are also shown as one of the signal conversion processing information.

  In addition, how many bits each pixel is composed of at the A / DBit depth is also shown as one of the signal conversion processing information. The number of bits per pixel ranges from 8 bits to 14 bits, and this number of bits is shown as one piece of signal conversion processing information. Further, the coordinate position (X, Y) of the defective pixel is also shown as one of the signal conversion processing information by the CCD scratch position. FIG. 4 shows that there are defective pixels at three locations (Xt1, Yt1), (Xt2, Yt2), and (Xtn, Ytn). If there is such a defective pixel, interpolation processing or the like is performed using a plurality of pixels adjacent to the defective pixel, and the defective pixel is repaired.

  When such signal conversion processing information is set in the digital signal processing unit 103b on the camera body 1b side, processing suitable for the CCD in the camera head is performed on the image signal sent via the high-speed serial bus. The

  The above is the configuration of the camera head 1a.

  Returning to FIG. 2, the configuration of the camera body 1b will be described.

  The operation of the camera body 1b is comprehensively controlled by the body CPU 100b. A system memory 101b in which a program is stored also on the camera body 1b side, and a nonvolatile memory for storing ID information and signal conversion processing information transmitted from the camera head 1b side in a writable and non-volatile manner. 102b is deployed. In the system memory 101b, a program indicating the procedure of the main process of the camera system is described. In the program, a live view image signal is processed in cooperation with the head CPU 19a on the camera head 1a side. It is also described that it is a processing procedure when a still image signal is processed, or a processing procedure when a moving image signal is processed.

  According to the program stored in the system memory 101b, the main body CPU 100b controls the exchange of commands on the 3-wire serial bus and the reception of image signals on the high-speed serial bus. The 3-line serial bus is driven by a 3-line serial driver 151b, and the high-speed serial bus is driven by a 3-line serial driver 150b. The operations of these drivers are controlled by the main body CPU 100b.

  As described above, the serial bus is driven by the 3-wire serial driver 151a on the camera head side and the 3-wire serial driver 151b on the camera body side to exchange commands, and ID information and signal conversion processing information are transmitted from the camera body 1b side. Is transmitted to the camera head 1a via the 3-wire serial bus, the head CPU 19a reads the ID information and signal conversion processing information stored in the nonvolatile memory 191a of the camera head 1a. The ID information and the signal conversion processing information are supplied to the 3-wire serial driver 151a, and the ID information and the signal conversion processing information are transmitted to the camera body 1b via the 3-wire serial bus. When the ID information and the signal conversion processing information are transmitted to the camera body 1b in this way, the ID information and the signal conversion processing information are received by the 3-wire serial driver 151a under the control of the body CPU 100b. Information and signal conversion processing information are stored in the nonvolatile memory 102b. This non-volatile memory 102b is a memory having a capacity for storing a pair of ID information and signal conversion processing information for a plurality of camera heads, other than the ID information previously stored in the non-volatile memory of the camera body 1b. When the camera head having the ID information is mounted, the ID information and the signal conversion processing information are downloaded and stored.

  The request for transmission of the ID information and the signal conversion processing information using the three-wire serial bus is made in response to the occurrence of one of the events of mounting the camera head 1a and turning on the power by the power SW 14b. If any event occurs, power is supplied to the power control unit 140b that is always supplied with power from the battery Bt, and further to each unit including the main body CPU 100b via the DC / DC converter. At this time, power is supplied to the DC / DC converter on the camera head side via the mount contact, and power is supplied to each part of the camera head. Then, the main body CPU 100b controls the 3-wire serial driver 151b to request the camera head 1a to transmit ID information through a serial bus driven by the 3-wire serial driver 151b, and the received ID information is stored in the nonvolatile memory 102b. If the ID information does not match, the camera head 1a is requested to transmit the signal conversion processing information, and the received ID information and the signal conversion processing information are stored in the nonvolatile memory 102b.

  Thus, when the camera head 1a is mounted or when the power switch 14b is turned on, the ID information, and in some cases, the signal conversion processing information corresponding to the ID information is non-volatile under the control of the main body CPU. When stored in the memory 102b and the signal conversion processing information is set in the signal processing unit 103b, the camera system 1 enters a shooting standby.

  However, if the CFA or the like in the signal conversion processing information transmitted from the attached camera head is, for example, an image sensor having a filter having an emerald green color scheme, the signal conversion processing cannot be performed by the signal processing unit. A situation may arise. Since it is inconvenient that shooting cannot be performed due to such a situation, the main body CPU 100b determines whether or not the signal conversion processing in the digital signal processing unit 103b can be performed. When the main body CPU 100b determines that the signal conversion processing according to the signal conversion processing information of the camera head 1a cannot be performed by the digital signal processing unit 103b, the signal processing unit 103b does not perform the signal conversion processing and performs so-called signal conversion processing. Image display (monochrome display) based on RAW (raw) data is performed, and the RAW (raw) data is recorded on a memory card in accordance with a shooting operation.

  As described above, the main body CPU 100b recognizes the type of the camera head 1a based on the ID number downloaded from the camera head 1a attached to the camera main body 1b, and the main body CPU 100b corresponds to the ID number. Whether the camera body has a capability of performing signal conversion processing for converting an image signal received from the camera head into an image signal composed of a luminance signal and a chromaticity signal based on the signal conversion processing information is there. That is, the main body CPU 100b corresponds to both the type recognition unit and the availability determination unit referred to in the present invention.

  After the ID information and the signal conversion processing information are downloaded in this way, when the power is turned on and photographing is performed, a command indicating a request for transmitting a through image signal from the camera body 1b is sent through the 3-wire serial bus to the camera head 1a. Sent to. The head CPU 19a on the camera head 1a side receives the through image transmission request and transmits the through image signal to the camera body 1b through the high-speed serial bus driven by the high-speed serial driver 150a. The through image signal transmitted to the camera body 1b through the high-speed serial bus is supplied to the digital signal processing unit 103b, subjected to predetermined processing by the digital signal processing unit 103b, and then stored in the frame memory 104b. Is done. The YC signal stored in the frame memory 104b is supplied to the LCD control unit 105b, and a through image is displayed on the screen of the LCD 1050b by the LCD control unit 105b. If the camera head is incompatible and cannot be processed on the camera body side, black and white through based on RAW (raw) data is not performed in the signal processing unit. Is displayed.

  When the release button 13b is pressed while viewing this color or black and white through image, an interrupt signal is supplied to both the main body CPU 100b and the head CPU 19a, the processing of the through image is interrupted, and an external interrupt interrupts the system memory. The still image processing program described in is started. As shown in FIG. 2, when the release button 13b is pressed, a release signal is directly input to the external interrupt input pin in both the main body CPU 100b and the head CPU 19a. The head CPU 19a on the camera head 1a side supplies an exposure start signal from the TG 18a to the CCD 12a at the interrupt timing when the release button 13a is pressed, and starts the exposure on the CCD 18a. Thereafter, an exposure end signal is supplied from the TG 18a to the CCD 12a to cause the CCD 12a to output a still image signal composed of all pixel data to the analog signal conversion processing 13a. The still image signal output to the analog signal processing unit 13a is supplied from the analog signal processing unit to the digital signal processing unit 103b through the A / D unit 14a and the high-speed serial bus 150a. If the signal processing unit 103b can perform signal conversion processing, a JPEG-compressed JPEG file is transferred to the memory card 108b loaded in the memory card slot 107b via the card I / F 106b under the control of the main body CPU. Remembered. When the signal conversion process cannot be performed, the image signal without the signal conversion process is recorded on the memory card as it is without performing the signal conversion process.

  When the mode dial 14b is in the moving image mode, an interrupt is generated by operating the release button 13b and the moving image processing program is started, and the moving image signal passes through the high-speed serial bus at every predetermined time to the digital signal processing unit 103b. Then, the motion JPEG or MPEG compression is performed and recorded in the memory card 108b.

  Although not directly related to the present invention, a timer 110b for timer processing, a calendar clock unit 111b, and the like are also provided. For example, when calendar data is supplied from the calendar clock unit to the LCD control unit 105b, the screen of the LCD 1050b is displayed. A clock or calendar is displayed with the subject on top. Further, the camera body 1b has a USB connector 130b. When a personal computer or the like is connected via the USB connector 130b, the USB is driven by the USB driver U131b and an image signal is transferred to the personal computer. Also, a flash light emitting device comprising a flash unit 121b that emits flash light from the flash light emission window 12b shown in FIG. 1 and a flash control unit 120b, a switch / LED 132b on the back side of the camera body, etc. It is configured to operate under the control of the CPU 100b.

  Here, the configuration around the power control unit 140b of the camera main body 1b that supplies power to the power control unit 100a and the DC / DC converter 101a also on the camera head 1a side will be described.

  In the camera system 1, as described above, a main body which is a type recognition unit of a camera head when exchanging commands via a 3-wire serial bus and requesting the camera head 1a to transmit ID information and signal conversion processing information. The CPU 100b requests the camera head to transmit the ID information in response to the occurrence of one of the mounting of the camera head 1a and the power-on by the power SW 14b, and the received ID information is stored in the main body side memory. When the ID information does not match, the camera head is requested to transmit the signal conversion processing information, and the received ID information and signal conversion processing information are stored in the main body side memory.

  In order to perform such processing, the main body CPU 100b needs to detect the reason for turning on the power. Therefore, in order to notify the main body CPU 100b of the reason for turning on the power, a latch unit 160b is provided and the power control unit 140b has this latch unit. The content of 160b is rewritten. The contents of the latch unit 160b are read by the main body CPU 100b via the I / O unit 161b to inform the main body CPU 100b of the reason for turning on the power. The main body CPU 100b determines that the camera head is attached, for example, if the latch section 160b is set to “H” and the contents of the I / O section 161b are rewritten to “H”, and ID information is given to the camera head. Send a request to send. If it is 'L', it is determined that the power switch 14b is turned on, and power is supplied to each part on the camera body side.

  In this way, whether the reason for turning on the power is due to the mounting of the camera head 1a or the operation of the power supply SW is notified to the camera body through the I / O and recognized by the camera body. Then, for example, when the latch portion is 'H', after acquiring ID information and signal conversion processing information from the camera head 1a, the main body CPU 100b rewrites the contents of the I / O, thereby It is also possible to instruct the power supply control unit 140b to shut off.

  Next, the operation of the digital signal processing unit 103b in which the signal conversion processing information is set will be described in detail with reference to FIG.

  FIG. 5 is a diagram for explaining the signal conversion process of the digital signal processor 103b.

  The digital signal processing unit 103b is configured by a so-called dynamic programmable DSP (Digital signal processor). When signal conversion processing information is externally set in the digital signal processing unit 103b, processing according to the signal conversion processing information is performed. Here, if the signal conversion processing information shown in FIG. 3 corresponds to the capability of the digital signal processing unit 103b configured by the DSP, the signal conversion processing information is set in the digital signal processing unit 103b. When a through image signal, a still image signal, and a moving image signal are transmitted from the camera head 1a through the high-speed serial bus to the signal processing unit 103b in which the signal conversion processing information is set, signal conversion based on the signal conversion processing information Processing is performed on the through image signal, the still image signal, or the moving image signal.

  FIG. 5 shows a process until the through image signal is displayed on the display screen when the power is turned on. When displaying a through image on the display screen of the LCD 1050b, a through image signal that has been gamma corrected by the digital signal processing unit 103b is supplied to the frame memory 104b at a predetermined time and stored in the frame memory 104b. An image based on the signal is displayed as a through image on the display screen of the LCD 1050b.

  With reference to FIG. 5, a signal conversion process of a through image signal performed by the digital signal processing unit 103b will be described.

  As shown in FIG. 5, first, defective pixel correction processing is performed in step S501, and OB offset correction is performed in the next step S502. In the defective pixel (scratch) correction in step S501, interpolation processing is performed using pixels around the defective pixel shown in FIG. 4 to repair the defective pixel. In the OB offset process in step S502, the image signal in the OB area shown in FIG. 3 is set as a reference level (black level), and the image signal other than the OB area is clamped to the reference level. This clamp process is an OB offset process. After the offset correction is performed, in step S503, the white level, that is, the white balance (WB) is adjusted with respect to the black level. This white color is generated by additive color mixing of R, G, and B. If the gains of the R, G, and B signals are not adjusted so that the gains of the R, G, and B are equal, the purity is pure. High white color cannot be obtained. Here, in order to obtain a white having a high purity, a process of adjusting the gains of R, G, and B so as to obtain a white having a high purity according to the color temperature of the light source type detected by the AWB sensor 11b is performed. ing. When the R, G, and B gains are adjusted in this way and the white balance is adjusted, linear matrix processing is performed in step S504, that is, RGB signals are converted into YCC signals composed of luminance and chromaticity signals. Done. Here, RGB is multiplied by, for example, a 3 × 3 color conversion matrix to be converted into a Y signal, a Cr signal, and a Cb signal. For example, if the contrast is to be increased, among the coefficients of the 3 × 3 color conversion matrix, if the weight of the diagonal element is increased and the conversion to the YC signal is performed, the brightness signal and the chromaticity signal with increased contrast are used. YC signal is generated. Proceeding to the next step S505, the Y signal is subjected to gamma correction, and in the next step S506, the Y signal and the C signal are synchronized. Then, the edge enhancement process is performed in step S5072 as the process on the luminance signal (Y) side, and the color difference matrix process is performed in parallel in step S5071 as the process on the chroma signal (C) side. When both processes are completed, the process proceeds to the next step S508, where an image signal composed of the Y signal and chromaticity signals Cr (R−Y) and Cb (B−Y) is stored in the frame memory, and the frame is displayed by the LCD controller. An image based on the Y signal and chromaticity signal stored in the memory is displayed on the display screen.

  Thus, the signal conversion processing information downloaded from the camera head 1a is set in the digital signal processing unit 103b, and the image signal is processed by the digital signal processing unit 103b in accordance with the set contents.

  In addition to the above processes, the digital signal processing unit 103b has a scaling function for displaying an image on the display screen of the LCD 1050b. The number of pixels of the image sensor and the aspect ratio of the image sensor differ. However, pixel number adjustment processing for adjusting the number of pixels and the aspect ratio of the display screen is performed so that an image corresponding to the imaging size of the image sensor is properly displayed on the display screen. When the main body CPU 100b, which is a determination unit, determines that the signal conversion process cannot be performed, the pixel number adjustment process is performed even when displaying the live view based on the RAW data, and there is left on the display screen. The through image is displayed properly.

  Here, what has been described so far will be described with reference to a flowchart.

  FIG. 6 is a flowchart showing a procedure of initialization processing performed by the main body CPU 100b when the camera head 1a is attached to the camera main body.

  As described above, the main body CPU 100b starts processing when power is supplied from the battery Bt to each section including the main body CPU 100b by the power control section 140b in response to the occurrence of one of the mounting of the camera head 1a and the power-on. To do.

  Steps S601 and S602 in the flow are parts where the power supply control unit performs processing. When the power supply control unit 140b receives the mounting of the camera head 1a, the battery Bt and the DC / DC converter are connected in step S601 to the battery. Power is supplied from Bt to each unit via a DC / DC converter, and after supplying power to the camera head 1a in step S602, the main body CPU 100b starts processing. The main body CPU 100b transmits a signal conversion processing information transmission request to the camera head 1a using 3-wire serial communication in the next step S603, and enters a data reception waiting state in the next step S604. When the information of the camera head 1a is downloaded in step S604, the 3-wire serial driver is shifted from the reception waiting state to the reception state, and the information from the camera head is received by the 3-wire serial driver. When the 3-wire serial driver receives the information, the received information is stored in the volatile memory 102b in step S605. In step S606, the power supply to the camera head 1a is stopped. In step S607, the power supply of the camera system is turned off, and the process of this flow ends.

  Thus, when the camera head 1a is attached to the camera body 1b, ID information and signal conversion processing information are downloaded from the camera head 1a, and after ID information and signal conversion processing information are downloaded, shooting is not always performed. Because there is no power is cut off. Thereafter, when taking an image, if the power is turned on by the power switch, the image can be taken immediately after the power is turned on.

  FIG. 7 is a diagram for explaining the flow of image signals when the camera head 1a is attached to the camera body 1b, the power is turned on, and a through image is displayed on the display screen. When the main body CPU 100b, which is the determination unit according to the present invention, determines that the digital signal processing unit 103b has the ability to perform signal conversion processing according to the signal conversion processing information of the attached camera head 1a, FIG. (A) A signal conversion process based on the flow (same as FIG. 5) is performed, and if not, a process based on the flow of FIG. 7B is performed. FIG. 7B shows a case where the main body CPU 100b displays an image on the display screen of the LCD 1050b based on an image signal (RAW data) generated by the CCD without performing all the processing in the digital signal processing unit 103b. The procedure is shown.

  As described above, depending on the number of pixels of the image sensor provided in the camera head 1a and the filter arrangement of the CFA, the digital signal processing unit 103b may not be able to perform signal conversion processing. In that case, as indicated by an arrow in the figure. In addition, the process based on the flow of FIG. 7B is performed instead of the process based on the flow of FIG. 7A, and a monochrome image based on the RAW data is displayed on the display screen.

  By doing so, a situation in which the through image is not displayed is avoided, and the through image is always displayed on the display screen.

  As described above, even if the camera body has a signal processing unit that does not have the ability to perform signal conversion processing on the image signal transmitted from the attached camera head, a through image is displayed and the camera body side instead of the viewfinder A camera system that can use the display screen is realized.

  FIG. 8 is a diagram for explaining a modification of FIG.

  In FIG. 7, the image based on the image signal (RAW data) generated by the CCD is displayed as it is on the display screen. However, the number of pixels of the image sensor may not match the number of pixels of the display screen. In such a case, if an image based on an image signal that is RAW data is displayed as it is on the display screen, the image may not be displayed well.

  Therefore, when the main body CPU 100b, which is a determination unit, determines that the mounted camera head 1a is a type of camera head 1a that cannot be subjected to signal conversion processing by the digital signal processing unit 103b, and the camera head If the number of vertical and horizontal pixels of the CCD of 1a (see FIG. 3) does not match the number of vertical and horizontal pixels on the display screen of the LCD 1050b (the CPU has previously acquired the number of pixels of the equipped LCD), digital The signal processing unit 103b performs a pixel number adjustment process for adjusting the number of pixels by mixing adjacent pixels in step S5075 without performing a signal conversion process, and in step S508, the pixel control unit 103b applies the pixel control process to the LCD control unit as an image display unit. An image based on the image signal after the number adjustment processing is displayed. In this way, an image matching the size of the display screen of LCD 1050b is displayed. Here, since the number of pixels of the CCD is usually larger than the number of pixels on the display screen, the number of pixels is reduced by mixing the pixels and then displayed on the display screen of the LCD 1050b.

  FIG. 9 is a diagram for explaining a modification of FIG.

  When the main body CPU 100b, which is an availability determination unit, determines that the mounted camera head 1a is a type of camera head 1a that cannot perform signal conversion processing by the digital signal processing unit 103b, and in the imaging region of the CCD 12a. Even when the aspect ratio and the aspect ratio of the display area on the LCD display screen are different, the digital signal processing unit 103b determines the horizontal pixel count on the image signal obtained by the CCD 102a in the horizontal direction on the LCD 1050b display screen. A pixel number matching process for matching the number of pixels is performed, and an image based on the image signal after the pixel number matching process is displayed on the LCD 1050b display screen on the LCD control unit 105b which is an image display unit. Further, at this time, if an area where no image appears on the display screen of the LCD 1050b by the normalization of the aspect ratio, that is, the pixel number matching process, is performed by the digital signal processing unit 103b in step S5076, the area is displayed in a predetermined color. A masking process for filling is performed, and an image based on the image signal after the masking process is displayed on the display screen on the LCD control unit which is an image display unit.

  In this way, even if the aspect ratio of the display screen and the imaging area, that is, the aspect ratio is different, the signal processing unit is based on the image signal that has undergone pixel number matching processing (normalization of aspect ratio) including masking processing. The image is displayed neatly on the display screen.

  FIG. 10 is a diagram for explaining the pixel number adjustment and the pixel number matching process of the signal processing unit 103b.

  The left side of FIG. 10 shows the aspect ratio (N / M) of the imaging area of the CCD 12a, and the right side of FIG. 10 shows the aspect ratio (n / m) of the display area on the display screen of the LCD 1050b. Yes.

  When both aspect ratios are the same as shown in FIG. 10A, the vertical and horizontal pixel counts of the CCD imaging area are matched with the vertical and horizontal pixel counts of the display screen, or the vertical and horizontal pixel counts of the display screen are set. The mathematical expression indicates that the pixel number adjustment processing is performed so as to match the number of pixels in the vertical or horizontal direction of the CCD imaging region. In general, the number of pixels in the vertical and horizontal directions of the CCD imaging region is often larger than the number of vertical and horizontal pixels on the display screen. Therefore, pixels arranged in the horizontal (N) direction on the CCD imaging region side as the pixel number adjustment processing. The number of pixels is mixed to adjust the number of pixels, and processing to match the display screen size (m × n) is performed.

  In addition, as shown in FIG. 10B, when the aspect ratios of the two are different and the horizontal length of the CCD imaging region is longer than the horizontal dimension of the display screen of the LCD 1050b. The mathematical expression indicates that the pixel number matching process according to the present invention is performed.

  For example, when the pixel arrangement in the CCD is a honeycomb arrangement, if the horizontal pixels arranged in a honeycomb shape are arranged in order in the horizontal direction, the number of pixels in the horizontal direction increases, and the CCD image is captured. The aspect ratio (N / M) of the area in the vertical and horizontal directions becomes larger than the aspect ratio (n / m) of the display screen.

  Therefore, a pixel number matching process is performed in which adjacent pixels in the horizontal (horizontal) direction are mixed and the number of pixels in the horizontal direction is reduced.

  In the present embodiment, when the vertical ratio M is shorter than the vertical ratio m of the display screen of the LCD 1050b (example shown in (1)), a subject image is displayed on the display screen of the LCD 1050b and further displayed. The areas that are not to be masked are displayed on the display screen in the form of black bands.

  When the vertical ratio M of the CCD is larger than the vertical ratio m of the display screen of the LCD 1050b (example shown in (2)), the subject image is displayed by cutting the top and bottom.

  In this way, the subject captured by the photographing optical system of the camera head is displayed as a through image on the LCD display screen. Note that FIG. 10 illustrates pixel number adjustment and pixel number matching processing for adjusting the number of horizontal pixels on the image signal obtained by the CCD 12a to the number of horizontal pixels on the LCD display screen. The pixel number adjustment processing is performed to adjust the number of pixels in the vertical direction on the display screen of the LCD 1050b to match the number of pixels in the vertical direction of the CCD and the number of pixels in the vertical direction of the display screen. You can do it.

  FIG. 11 is a diagram for explaining processing in the case of adjusting display gradation.

  When it is determined that the mounted camera head 1a is a type of camera head that cannot be subjected to signal conversion processing by the digital signal processing unit 103b, the floor per pixel of the image signal obtained by the CCD 12a. When the number of gradations per pixel of the image signal handled by the LCD control unit which is the image display unit is smaller than the logarithm, the digital signal processing unit 103b is obtained by the CCD 12a in step S50726 without performing signal conversion processing. The image after performing the tone number conversion process (shown as bit depth normalization process in FIG. 11) for converting the obtained image signal into the number of gradations that can be displayed by the LCD control unit as the image display unit An image based on the signal is displayed on the LCD control unit.

  FIG. 12 shows that the number of gradations per pixel of the image signal obtained by the CCD 12a is 11 bits, and the number of gradations per pixel of the image signal handled by the LCD control unit which is an image display unit is It is a figure explaining the conversion process in case it is 8 bits smaller than 11 bits.

  FIG. 12A is a schematic diagram for explaining the gradation characteristic, that is, the γ characteristic when the RAW data is 11 bits and the display gradation on the display screen of the LCD 1050b is 8 bits. FIG. 12B is a diagram for explaining what γ correction is performed when RAW data is 10 bits when performing γ correction in FIG.

  As shown in FIG. 12 (a), when the RAW data obtained by the CCD is an image signal having an 11-bit gradation number, the gradation is converted to an 8-bit display gradation and the halftone of the image is finely adjusted. Displayed on the display screen. On the other hand, when the RAW data of the CCD 12a is 10 bits, as shown in FIG. 12B, gradation conversion is performed using the upper 10 bits of 11 bits with reference to 11 bits on the RAW data side. It is. When the subject is displayed on the display screen as a black and white image, the subject is sufficiently visible even if an image having a very small halftone is not displayed. Thus, the upper 10 bits are used in the signal processing unit. The subject is displayed on the LCD control unit, which is an image display unit, by performing gradation conversion. As a matter of course, gradation conversion may be performed using the upper 9 bits if 9 bits and the upper 8 bits if 8 bits. On the other hand, in the case of 12-bit, 13-bit, and 14-bit RAW data, all the RAW data is normalized to 11-bit RAW data by omitting the lower bits of the RAW data, and then converted to RAW data. The image based on it is displayed. Even in this case, since the image based on the RAW data is a black and white image, an image that is sufficiently visually recognized as a subject image is displayed on the display screen.

  FIG. 13 is a flowchart showing a processing procedure when the main body CPU 100b adds a through image processing availability determination step during the initialization processing of FIG.

  Display in the display procedure described in FIG. 7A corresponds to the normal mode, and display in the display procedure described in FIG. 7B corresponds to the monochrome mode. The main body CPU 100b, which is also a determination unit according to the present invention, determines whether or not the digital signal processing unit 103b can perform signal conversion processing on an image signal generated by the attached camera head 1a. Is used, and the determination step is provided in step S6051, and the monitor (display screen of LCD 1050b) is set to the normal mode and the monochrome mode, respectively, in steps S6052 and S6053 according to the determination. .

  In this way, when the camera head 1a is attached to the camera body 1b, a display mode (normal mode or monochrome mode) corresponding to the camera head 1a is automatically set, and then the power is turned on. The through image is displayed in the mode set at initialization.

  FIG. 14 is a diagram showing a configuration in which a lens unit compatibility determination unit 180b and a recording mode setting unit 170b are added to the configuration of FIG.

  The recording setting unit 170b shown in FIG. 14 is determined when the main body CPU 100b, which is a determination unit, determines that the camera head 1a is of a type that cannot be converted by the digital signal processing unit 103b on the camera main body side. Based on the determination of the CPU 100b, when the RAW data recording mode for recording the RAW data on the memory card is designated, or when the digital signal processing unit 103b determines that the camera head is of a type that can perform signal conversion processing, This is a portion for setting whether to designate a normal mode for recording the image data subjected to the signal conversion processing on the memory card. When the power is turned on and shooting is performed, the contents of the recording mode setting unit 170b are referred to by the main body CPU 100b, and at the time of shooting, one of the modes is set in a register in the main body CPU so that image signals are recorded on the memory card. It has become.

  In addition, when a warning is displayed on the warning display unit 181b in the lens unit compatibility determination unit 180b, a camera head 1a of a type that cannot be subjected to signal conversion processing by the digital signal processing unit 103b on the camera body side by the main body CPU 100b that is a determination unit. If it is determined that there is a signal indicating that a warning is necessary based on the determination of the main body CPU 100b, and after the power is turned on, a through image is displayed and shooting is about to be performed. Based on the signal set in the lens unit compatibility determination unit, the warning display unit blinks or lights up, for example. Note that a warning display may be performed on the LCD using the OSD.

  FIG. 15 is a flowchart showing a procedure of a through image display process performed by the main body CPU having the configuration of FIG.

  The flowchart in FIG. 15 shows a flowchart similar to that in FIG. 13, and shows an example in which step S6054 is added after step S6053 in FIG.

  In step S6051, the LCD control unit 105b serving as the image display unit sets the monitor (display screen of the LCD 1050b) to the monochrome mode in step S6053 when an image based on the image signal without the signal conversion process is displayed. In step S6054, the display mode for displaying a warning that the camera head mounted is incompatible is set to the ON mode.

  Thereafter, when a black and white live-view image is displayed while the power is turned on and shooting is being performed, the warning display unit is turned on or blinked to display a warning.

  As described above, even if the camera body has a signal processing unit that does not have the ability to perform signal conversion processing on the image signal transmitted from the camera head to which the signal processing unit on the camera body side is mounted, the through image is displayed. A camera system that is displayed and can use the display screen instead of the viewfinder is realized.

It is a figure which shows the camera system which is one Embodiment of this invention. It is a block diagram which shows the structure of an electric system when the camera head 1a exists in the state with which the camera main body 1b was mounted | worn. It is a figure which shows ID information and signal conversion process information. It is a figure explaining the meaning of the signal conversion process information of FIG. It is a figure explaining the signal conversion process of the digital signal processing part 103b. It is a flowchart which shows the procedure of the initialization process which main body CPU100b performs when the camera head 1a is mounted | worn with the camera main body. It is a figure explaining the flow of an image signal when the camera head 1a is attached to the camera body 1b, the power is turned on, and a through image is displayed on the display screen. It is a figure explaining the modification of FIG. It is a figure explaining the modification of FIG. It is a figure explaining the scaling processing function which a signal processing part has. It is a figure explaining the process in the case of adjusting the gradation for a display. It is a figure explaining the characteristic of the display gradation on the display screen with respect to the RAW data obtained with the image pick-up element, ie, the state of (gamma) correction. 7 is a flowchart illustrating a processing procedure when a main body CPU 100b adds a through image processing availability determination step during the initialization processing of FIG. It is a figure which shows the structure which added the lens unit compatibility judgment part and the recording mode setting part to the structure of FIG. It is a flowchart which shows the procedure of the through image display process which main body CPU with a structure of FIG. 14 performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera system 1a Camera head 100a Power supply control part 101a DC / DC converter 11a Image pick-up optical system 12a CCD
13a Analog signal processing unit 14a A / D unit 150a High-speed serial driver 151a 3-wire serial driver 16a Integration circuit 17a Aperture / focus / zoom control unit 18a TG
19a Head CPU
190a System memory (ROM / RAM)
191a Non-volatile memory 192a Data bus 1b Camera body 10b Head mount 100b Body CPU
101b System memory 102b Non-volatile memory 103b Digital signal processing unit 104b Frame memory 105b LCD control unit 1050b LCD
106b Card I / F
107b Memory card slot 108b Memory card 150b High-speed serial driver 151b 3-wire serial driver

Claims (9)

In a camera system including a camera head including a photographing optical system and an image sensor, and a camera body that is detachably mounted and receives an image signal from the camera head and performs signal conversion processing,
The camera body is
A type recognition unit for recognizing the type of the camera head mounted on the camera body;
Whether or not the camera body is capable of performing signal conversion processing for converting an image signal received from a camera head of a type recognized by the type recognition unit into an image signal composed of a luminance signal and a chromaticity signal. A determination unit for determining whether or not
A signal processing unit that performs the signal conversion processing on an image signal received from a type of camera head that is determined to be capable of the signal conversion processing by the availability determination unit;
An image that includes a display screen on which an image is displayed, and that has been subjected to the signal conversion processing by the signal processing unit according to whether or not it is determined by the availability determination unit that the signal conversion processing is performed. A camera system comprising: an image display unit that displays a signal and an image based on an image signal from which the signal conversion process is omitted in the signal processing unit on the display screen. The image sensor includes a color separation filter,
The determination unit determines whether the signal conversion is performed when the color separation filter included in the image sensor of the camera head mounted on the camera body is a filter array that cannot perform the signal conversion process in the signal processing unit. The camera system according to claim 1, wherein it is determined that processing is impossible. The image sensor includes a color separation filter,
When the color separation filter included in the image sensor of the camera head mounted on the camera body is a filter having a color that cannot be subjected to the signal conversion processing by the signal processing unit, 2. The camera system according to claim 1, wherein it is determined that the conversion process is impossible. When the determination unit determines that the attached camera head is a type of camera head that cannot be subjected to the signal conversion processing by the signal processing unit, and the vertical and horizontal directions of the image sensor of the camera head When the number of pixels does not match the number of vertical and horizontal pixels of the display screen,
The signal processing unit performs a pixel number adjustment process for adjusting the number of pixels by mixing adjacent pixels without performing the signal conversion process,
The camera system according to claim 1, wherein the image display unit displays an image based on the image signal after the pixel number adjustment processing on a display screen. When the availability determination unit determines that the mounted camera head is a type of camera head that cannot perform the signal conversion processing by the signal processing unit, and the aspect ratio of the imaging area of the imaging device If the aspect ratio of the display screen is different,
The signal processing unit matches the number of vertical pixels on the image signal obtained by the image sensor with the number of vertical pixels on the display screen, or sets the number of horizontal pixels on the image signal to the horizontal number on the display screen. A process for matching the number of pixels to match the number of pixels,
The camera system according to claim 1, wherein the image display unit displays an image based on the image signal after the pixel number matching process on a display screen. The signal processing unit further performs a masking process to fill the area with a predetermined color when an area where no image appears on the display screen by performing the pixel number matching process,
The camera system according to claim 5, wherein the image display unit displays an image based on the image signal after the masking process on the display screen. It is a case where it is determined that the mounted camera head is a type of camera head that cannot perform the signal conversion processing by the signal processing unit, and per pixel of the image signal obtained by the image sensor. When the number of gradations per pixel of the image signal handled by the image display unit is smaller than the number of gradations,
The signal processing unit performs gradation number conversion processing for converting an image signal obtained by the imaging element into a number of gradations that can be displayed on the image display unit without performing the signal conversion processing. ,
The camera system according to claim 1, wherein the image display unit displays an image based on an image signal after gradation number conversion processing. When it is determined that the mounted camera head is a type of camera head that cannot perform the signal conversion processing by the signal processing unit,
The signal processing unit performs γ correction processing according to the image signal obtained by the image sensor,
The camera system according to claim 1, wherein the image display unit displays an image based on an image signal after the γ correction processing is performed.   The image display unit, depending on whether or not it is determined by the availability determination unit that the signal conversion process has the ability to perform the signal conversion process, respectively, the image signal subjected to the signal conversion process in the signal processing unit, and When displaying an image based on the image signal without the signal conversion process in the signal processing unit on the display screen and displaying an image based on the image signal without the signal conversion process, the attached camera head is not 2. The camera system according to claim 1, wherein a warning is displayed to indicate compatibility.

Images