JP4266365B2 - Camera system and camera body - Google Patents

Description

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

  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 processing (for example, Patent Document 2).

  However, in both the specifications of Patent Document 1 and Patent Document 2, a process in the case where the image signal received from the camera head on the camera body side cannot be subjected to signal processing by the capability of the signal conversion 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 and B, there is also a camera head equipped with an image sensor having a special CFA (Color Filter Array) having a four-color arrangement of emerald green, and such a camera head is mounted on the camera body. In such a case, it is sufficiently expected that a situation in which signal processing cannot be performed with the capability of the signal conversion processing unit of the camera body will occur. It is inconvenient that shooting cannot be performed at such times.
JP-A-8-172561 JP 2000-175089 A

  In view of the above circumstances, the present invention provides a camera system capable of photographing even a camera body having a signal conversion processing unit that does not have an ability to perform signal processing on an image signal transmitted from a mounted camera head, and It aims at providing each camera body.

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, a camera body that is detachably mounted, receives an image signal from the camera head, and performs signal processing. In a camera system equipped 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 conversion processing unit that performs the signal 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;
The signal conversion is performed depending on whether the recording medium on which the image signal is recorded is detachably mounted and the recording medium is determined to have the capability of performing the signal conversion processing by the determination unit. An image recording unit that records an image signal that has been subjected to the signal conversion processing in the processing unit, and an image signal in which the signal conversion processing in the signal conversion processing unit is omitted is provided.

  According to the camera system of the present invention, an image signal in which the signal conversion processing in the signal conversion processing unit is omitted by the image recording unit when the availability determination unit determines that the signal conversion processing is not possible. Is recorded on the recording medium.

  Then, shooting is performed regardless of what camera head is attached to the camera body, and an image signal subjected to signal conversion processing or an image signal without signal conversion processing is recorded on a recording medium. As long as the image signal is recorded in this way, an image based on the image signal can be reproduced and displayed even if the image signal is not subjected to signal conversion processing. If the recording medium is loaded in another camera body and the signal conversion processing unit of the other camera body has the ability to perform signal processing on the image signal recorded on the recording medium, the camera body By performing signal processing by the signal conversion processing section, it is possible to newly record the image signal subjected to signal processing on a recording medium.

  Here, the signal conversion processing unit further performs a signal repairing process for repairing the signal of the defective pixel of the image sensor on the image signal received from the mounted camera head regardless of the determination result by the availability determining unit. It is preferable.

  If the position of the defective pixel is indicated in the signal conversion processing information, the signal of the defective pixel is repaired by the peripheral pixels of the defective pixel, for example, based on the image signal. Even if the image is reproduced and displayed as it is without signal processing, the display image does not become difficult to see.

  In addition, when the camera body records an image signal without the signal conversion processing in the signal conversion processing unit, a display unit that displays that the image signal without the signal conversion processing is recorded It is preferable that it is a thing of the aspect provided with.

  Then, the photographer is visually notified by the display unit that the image signal without the signal conversion process is recorded on the recording medium. As a result, the photographer knows that the image signal obtained by photographing is recorded in an unprocessed state without being subjected to signal conversion processing.

  Such a camera system may handle an image signal representing a moving image or an image signal representing a still image.

Further, in a camera body that is detachably mounted with a camera head including a photographic optical system and an image sensor, receives an image signal from the camera head, and performs signal processing,
A type recognition unit for recognizing the type of camera head mounted on the camera body;
Whether or not the camera body has a capability 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 conversion processing unit that performs the signal processing on the image signal received from the camera head that is determined to be capable of the signal conversion processing by the availability determination unit;
The signal conversion is performed depending on whether the recording medium on which the image signal is recorded is detachably mounted and the recording medium is determined to have the capability of performing the signal conversion processing by the determination unit. An image recording unit that records an image signal that has been subjected to the signal conversion processing in the processing unit, and an image signal in which the signal conversion processing in the signal conversion processing unit is omitted is provided.

  As a result, a camera body capable of shooting regardless of what camera head is mounted is realized.

   As described above, a camera system capable of shooting even a camera body having a signal conversion processing unit that does not have the ability to perform signal processing on an image signal transmitted from a mounted camera head, and the camera body Is realized.

  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 photographing 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 processing. Yes.

  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 conversion processing unit to be described later. White balance adjustment. 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, an LCD panel, and the like are provided.

  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. After the image data generated by the CCD 12a is output to the analog signal conversion processing unit 13a and noise reduction processing is performed by the analog signal conversion processing unit 13a, the analog signal image signal is output by the A / D unit 14a at the subsequent stage. The digital signal is converted into an image signal and supplied to the 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. The release button 13b when an image signal for a through image (hereinafter referred to as a through image signal) for displaying an image on an LCD panel (not shown) or a still image shooting mode in the shooting mode is selected. An image signal representing a still image obtained by the operation of the release button 13b when the image signal representing the still image (hereinafter referred to as a still image signal) or the moving image mode in the shooting mode is selected. There are three types of image 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 conversion 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 the head CPU 19a. 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. .

  The nonvolatile memory 191a stores in a non-volatile manner ID information for identifying the camera head and signal conversion processing information necessary for signal processing in the camera body 1b of an image signal passed from the camera head 1a to the camera body 1b. If a command indicating 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 conversion is converted. Both the processing information and the 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 conversion 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 region (the region 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 conversion processing unit 103b on the camera body 1b side of the black level when the image is taken with 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 conversion 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. Is done.

  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 the signal conversion processing information is stored in the memory 102b and the signal conversion processing information is set in the signal conversion 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 unit cannot perform signal processing. A situation may arise. Since it is inconvenient that photographing cannot be performed due to such a situation, the main body CPU 100b determines whether or not signal processing in the digital signal conversion processing unit 103b can be performed. As a result of the determination by the main body CPU 100b, when it is determined that the signal processing according to the signal conversion processing information of the camera head 1a cannot be performed by the digital signal conversion processing unit 103b, the signal conversion processing unit 103b does not perform signal processing or So-called RAW (raw) data is recorded on a memory card, which is a recording medium, without performing signal processing other than repairing defective pixels.

  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 corresponds to both the type recognition unit and the availability determination unit referred to in the present invention.

  When the image information is downloaded after the ID information and the signal conversion processing information are downloaded in this way, a command indicating a request for transmitting a through image signal is transmitted from the camera body 1b to the camera head 1a through the 3-wire serial bus. . 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 conversion processing unit 103b, and after being subjected to predetermined processing by the digital signal conversion processing unit 103b, the frame memory 104b. Is remembered. 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 panel of the LCD 1050b by the LCD control unit 105b.

  When the release button 13b is pressed while viewing the through image, an interrupt signal is supplied to both the main body CPU 100b and the head CPU 19a, and the processing of the through image is interrupted and described in the system memory by an external interrupt. The still image processing program 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 processing 13a. The still image signal output to the analog signal conversion processing unit 13a is supplied from the analog signal conversion processing unit to the digital signal conversion processing unit 103b through the A / D unit 14a and the high-speed serial bus 150a, and further the signal conversion processing The JPEG file JPEG compressed by the unit 103b is stored in 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. 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 conversion processing unit 103b. Then, the motion JPEG or MPEG compression is performed and recorded in the memory card 108b. The main body CPU and the card I / F correspond to the image recording section referred to in the present invention.

  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 panel of the LCD 1050b 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. Further, a flash light emitting device including 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, and the like are connected via the I / O 133b. 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 conversion 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 conversion processing unit 103b.

  The digital signal conversion processing unit 103b is configured by what is called a dynamic programmable DSP (Digital signal processor). When signal conversion processing information is set from the outside in the digital signal conversion processing unit 103b, processing corresponding 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 conversion processing unit 103b configured by the DSP, the signal conversion processing information is set in the digital signal conversion 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 conversion processing unit 103b in which the signal conversion processing information is set, a signal 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 a still image signal is recorded on the memory card 108b when the release button 13b is pressed. When displaying a through image on the panel of the LCD 105b, the through image signal after the gamma correction by the gamma conversion processing unit 1035b is supplied to the frame memory 104b at every predetermined time and stored in the frame memory 104b. An image based on the above is displayed as a through image on the LCD panel. When a moving image signal is recorded on a memory card, compression or the like based on Motion JPEG or MPEG standards is performed instead of JPEG compression and recorded on the memory card.

  With reference to FIG. 5, the signal processing of the still image signal performed by the digital signal conversion 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 the image signal composed of the Y signal and the chromaticity signals Cr (R−Y) and Cb (B−Y) is JPEG-compressed, and the memory serving as a recording medium in step S509. Recorded as an image file on the card.

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

  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 perform DC processing. Power is supplied to each unit via / DC, and after supplying power to the camera head 1a in step S602, the main body CPU starts processing. The main body CPU transmits a transmission request for signal conversion processing information to the camera head 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 S605, the 3-wire serial driver is changed 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 S606. 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 and photographing is performed. When the main body CPU 100b, which is the determination unit according to the present invention, determines that the digital signal conversion processing unit 103b has the ability to perform signal processing according to the signal conversion processing information of the attached camera head 1a, FIG. (A) The signal processing based on the flow (same as FIG. 5) is performed, otherwise the processing based on the flow of FIG. 7 (b) is performed. In FIG. 7B, the main body CPU does not perform all the processing in the signal conversion processing unit, but adds part of the signal conversion processing information shown in FIG. 3 as data in step S5085 and records it on the recording medium. The procedure to do 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 conversion processing unit 103b may not be able to perform signal processing. In that case, as indicated by an arrow in the figure. 7B is not the process based on the flow of FIG. 7A, but the process based on the flow of FIG. 7B is performed, and a part of the signal conversion processing information of the camera head is added as data, and the RAW data is recorded on the recording medium. Recorded on a memory card.

  In this way, a situation where shooting cannot be performed is avoided, and an image signal obtained by shooting is recorded on the memory card in a compressed state or in an uncompressed state.

  As described above, even if the signal conversion processing unit on the camera main body side is a camera main body having a signal conversion processing unit that does not have the ability to perform signal processing on the image signal transmitted from the mounted camera head. A camera system and a camera body that can perform the above are realized.

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

  As shown in FIG. 8, since the digital signal conversion processing unit may be able to perform correction if the position of the defective pixel is known, the main body CPU 100b performs the signal conversion processing of the camera head on the digital signal conversion processing unit 103b. When it is determined that there is no capability to perform, the digital signal conversion processing unit 103b is improved so as to perform only the correction of the defective pixel in step S501. By doing so, even if an image based on the RAW data is displayed, the signal of the defective pixel is repaired, so that the defective pixel does not cause a defect in the image and is relatively clear. An image is displayed.

  FIG. 9 is a flowchart showing a processing procedure when the main body CPU 100b adds a signal processing availability determination step to the initialization processing of FIG.

  Recording in the memory card, which is a recording medium, in the recording procedure described in FIG. 7A corresponds to the normal recording mode, and recording is performed in the memory card, which is a recording medium, in the recording procedure described in FIG. Corresponds to the RAW data recording mode. The main body CPU 100b, which is also a determination unit according to the present invention, determines whether the digital signal conversion processing unit 103b can perform signal processing on the image signal generated by the attached camera head. Utilizing this, the determination step is provided in step SS6051, and the normal mode and the RAW data recording mode are respectively set in steps S6052 and S6053 according to the determination.

  In this way, the recording mode corresponding to the camera head 1a is automatically set when the camera head 1a is attached to the camera body 1b, and the mode set at initialization when the power is turned on thereafter. The image is taken and the image signal is recorded on a memory card which is a recording medium.

  FIG. 10 is a diagram showing a modification of FIG.

  FIG. 10 shows an example in which step S6054 is added after step S6053 in FIG. 9 so that a warning is displayed.

  FIG. 11 is a diagram showing an example in which FIG. 10 is further modified.

  FIG. 11 shows an example in which the user selects either the normal recording mode shown in FIG. 7A or the RAW data recording mode shown in FIG. 7B. For example, two selection items of “record” and “do not record” are displayed on the display screen on the camera body side as the recording mode selection items, and the user designates one of them with a cross key or the like. If “record” is designated, the process proceeds to the RAW side in step S60528, a RAW data recording mode is set in step, and a mode for displaying an uncompressed warning is set in step S6054. In step S606, the power supply is stopped, and in step S607, the power is turned off to complete the processing of this flow.

  If “not record” is designated, the process proceeds to the non-record side in step S60528, and a mode for displaying a warning that the camera head is not compatible is set in step S60529 and the next step S606 is set. In step S606, the power supply to the camera head 1a is stopped. In step S607, the power is turned off, and the process of this flow ends.

  As described above, even a camera body having a signal conversion processing unit that does not have the ability to perform signal processing on an image signal transmitted from a camera head equipped with a signal conversion processing unit on the camera body side can shoot. A camera system that can be performed and a camera body are realized.

It is a figure which shows the camera system which is one Embodiment of this invention. FIG. 2 is a block diagram showing a configuration of an electric system when the camera head 1 is mounted on the camera body 4. 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 which shows the structure of a digital signal conversion process part. It is a flowchart which shows the process sequence of the initialization process which main body CPU performs when a camera head is mounted | worn. It is a figure explaining the flow of an image signal when camera head 1a is attached to camera body 1b and photography is performed. It is a figure which shows the modification of FIG. It is a flowchart which shows the process sequence when main CPU performs the process of Fig.7 (a) and (b). It is a figure which shows the modification of FIG. It is a figure which shows the modification of FIG.

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 conversion 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 conversion processing unit 1031b Offset correction unit 1032b Integration circuit 1033b WB gain multiplication unit 1034b Linear MTX
1035b Gamma correction unit 1036b Synchronization unit 10371b Contour correction unit 10372b Color difference MTX
1038b JPEG compression 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 (6)

In a camera system comprising: a camera head provided with an imaging 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 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 conversion 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;
The signal conversion is performed depending on whether the recording medium on which the image signal is recorded is detachably mounted and the recording medium is determined to have the ability to perform the signal conversion processing by the determination unit. A camera system comprising: an image signal that has been subjected to the signal conversion process in a processing unit; and an image recording unit that records an image signal in which the signal conversion process is omitted in the signal conversion processing unit.   The signal conversion processing unit further performs a signal repairing process for repairing a signal of a defective pixel of the image sensor to an image signal received from a mounted camera head regardless of a determination result by the availability determining unit. The camera system according to claim 1.   When the camera body records an image signal without the signal conversion processing in the signal conversion processing unit, the camera body includes a display unit that displays that the image signal without the signal conversion processing is recorded The camera system according to claim 1.   2. The camera system according to claim 1, wherein the camera system handles an image signal representing a moving image.   2. The camera system according to claim 1, wherein the camera system handles an image signal representing a still image. In a camera body that is detachably mounted with a camera head including a photographic optical system and an image sensor, receives an image signal from the camera head, and performs signal processing,
A type recognition unit for recognizing the type of camera head mounted on the camera body;
Whether or not the camera body has a capability 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 conversion processing unit that performs the signal processing on an image signal received from a camera head that is determined to be capable of the signal conversion processing by the availability determination unit;
The signal conversion is performed depending on whether the recording medium on which the image signal is recorded is detachably mounted and the recording medium is determined to have the ability to perform the signal conversion processing by the determination unit. A camera main body comprising: an image signal that has been subjected to the signal conversion process in a processing unit; and an image recording unit that records an image signal in which the signal conversion process is omitted in the signal conversion processing unit.

Images