JP4298491B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus capable of adding modification detection data (MAC, digital signature, etc.) that is data for detecting modification of image data to original image data obtained by photographing. .

Conventionally, there has been proposed an information processing apparatus that adds MAC (Message Authentication Code), which is alteration detection data (data for detecting alteration) of image data, to image data obtained by photographing (for example, Patent Documents). 1). Here, the modification detection data is data for detecting modification of the image data.
JP-A-2002-237941 (paragraph number 0113 etc.)

  However, in the above-described conventional example, when the alteration detection data is added to the image data, only whether or not the alteration detection data is added is set according to the setting before photographing. For this reason, if the user forgets the setting for adding the modification detection data before photographing, the modification detection data cannot be added thereafter.

  In addition, since the calculation for adding the modification detection data to the image data requires a very long processing time, the above calculation is performed when the next shooting is performed after the shooting is performed after setting the modification detection data to be added. You have to wait until the process is complete. As a result, even if you miss a photo opportunity, or when you re-shoot due to blurring or underexposure, you cannot cancel the image data immediately after shooting, which is inconvenient for the user. Yes.

An imaging apparatus according to the present invention is an imaging apparatus capable of selecting a shooting mode and another mode, an imaging unit that captures a subject image to obtain image data, and the image data obtained by the imaging unit . Calculation means for calculating modification detection data for detecting modification , operation means for selecting whether or not to add the modification detection data to the image data, and obtained by the imaging means in the photographing mode Display means for displaying the image data by a quick review function for displaying the image data, and the first by the quick review function after shooting of the first image data and before shooting of the second image data . wherein when the operation means is operated during the display of the image data, whether or not to add the modified detection data to the first image data according to the operation And having a constant controlling means.

According to the present invention, after the first image data is shot and before the next second image data is shot, the alteration detection data can be added to the first image data by operating the operating means. it can. For this reason, even when the setting for adding the modification detection data before capturing the first image data is forgotten as in the prior art, the modification detection data is added to the first image data again after capturing the first image data. Therefore, the usability of the imaging device can be improved.

When the operation means is operated while the first image data is displayed by the quick review function, it is possible to determine whether to add the modification detection data to the first image data according to the operation. . Thereby, the setting relating to the addition of the alteration detection data can be performed while confirming the image data displayed by the quick review display function.

  By performing calculation of modification detection data during display by the quick review function, for example, it is possible to shorten the creation time of image data to which modification detection data is added, compared to the case of performing calculation after display by the quick review function. it can.

If the alteration detection data is selected by operating the operation means during the display by the quick review function, the display is continued until the calculation of the alteration detection data is completed, thereby displaying the image data by the quick review function. The time can correspond to the calculation time of the modification detection data. For example, it is possible to prevent the calculation from being performed after the display by the quick review function.

If the operation means selects not to add alteration detection data during display by the quick review function, unnecessary display can be prevented and power saving can be achieved by stopping the display.

If the operation means selects not to add alteration detection data while it is being displayed by the quick review function and calculation of alteration detection data, the display and computation are stopped to prevent unnecessary display and computation. It is also possible to save power.

  By performing display for selecting whether to add modification detection data during display by the quick review function, selection regarding addition of modification detection data can be easily performed while viewing this display.

When non-use of the quick review function is selected by the quick review selection unit, whether or not the alteration detection data is added to the first image data according to the selection by the operation unit before photographing the first image data By determining whether or not, the alteration detection data can be added to the first image data according to the selection of the operation means without performing display by the quick review function.

  Hereinafter, preferred examples of the present invention will be described. In the following embodiments, an apparatus having a function of generating image data using an imaging element (CCD, CMOS sensor, etc.) is called an imaging apparatus. That is, the imaging device includes devices such as a digital camera, a digital video camera, and a camera-equipped mobile phone.

  FIG. 1 is a block diagram showing a configuration of a camera system in Embodiment 1 of the present invention. In this embodiment as well, the camera system includes a digital camera 100 that is an example of an imaging apparatus, and an interchangeable lens 300 that is detachably attached to the digital camera 100.

  In FIG. 1, 12 is a shutter for controlling the amount of exposure to an image sensor (imaging means) 14, and 14 is an image sensor such as a CCD or CMOS sensor. An optical image formed by a photographing optical system is used as an electrical signal. In addition to conversion, the electrical signal is stored and then output. The light beam incident on the photographing lens 310 in the interchangeable lens 300 can pass through the aperture 312, the lens mount 306, the camera mount 106, the mirror 130, and the shutter 12, and can be formed on the image sensor 14 as an optical image.

  Reference numeral 16 denotes an A / D converter that converts an analog signal output of the image sensor 14 into a digital signal. A timing generator 18 supplies a clock signal and a control signal to the image sensor 14, the A / D converter 16, and the D / A converter 26, and includes a memory control unit 22 and a system control unit (control unit, calculation unit) 50. Controlled by

  An image processing unit 20 performs image processing such as predetermined pixel interpolation processing and color conversion processing on the data from the A / D converter 16 or the data from the memory control unit 22. In the image processing unit 20, predetermined calculation processing is performed using original image data obtained by imaging, and the system control unit 50 performs shutter control unit 40 based on the calculation result in the image processing unit 20. In addition, by performing drive control of the focus detection unit 42, TTL (through-the-lens) AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash pre-emission) processing can be performed.

  Furthermore, the system control unit 50 also performs TTL AWB (auto white balance) processing based on a predetermined calculation processing result in the image processing unit 20.

  In the present embodiment, since the focus detection unit 42 and the photometry unit 46 are exclusively provided, AF (autofocus) processing, AE (automatic exposure) processing, and EF are performed using the focus detection unit 42 and photometry unit 46. (Flash dimming) processing is performed, and AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash dimming) processing using the image processing unit 20 are not performed. You can also.

  A memory control unit 22 controls driving of the A / D converter 16, the timing generation unit 18, the image processing unit 20, the image display memory 24, the D / A converter 26, the memory 30, and the compression / decompression unit 32. .

  The output data of the A / D converter 16 is written into the image display memory 24 or the memory 30 through the image processing unit 20 and the memory control unit 22 or only through the memory control unit 22.

Reference numeral 24 denotes an image display memory, 26 denotes a D / A converter, 28 denotes an image display unit (display means) composed of a TFT, an LCD, and the like. The display image data written in the image display memory 24 is displayed by the image display unit 28 via the D / A converter 26. Here, if the image data captured using the image display unit 28 is sequentially displayed, the electronic viewfinder function can be realized.

  Further, the image display unit 28 can switch between display / non-display in accordance with an instruction from the system control unit 50, and when the image display unit 28 is in the non-display state, the power consumption in the digital camera 100 can be greatly reduced. Can do.

  Reference numeral 30 denotes a memory for storing captured still images and moving images, and has a sufficient storage capacity to store a predetermined number of still images and a predetermined time of moving images. Thereby, even in the case of continuous shooting or panoramic shooting in which a plurality of still images are continuously shot, it is possible to write a large amount of images to the memory 30 at high speed. The memory 30 can also be used as a work area for the system control unit 50.

  A compression / decompression unit 32 compresses and decompresses image data by adaptive discrete cosine transform (ADCT) or the like, reads an image stored in the memory 30, performs compression processing or decompression processing, and stores the processed data in the memory 30. Write to.

  A shutter control unit 40 controls the driving of the shutter 12 based on the output of the system control unit 50. Here, the system control unit 50 calculates an exposure value (shutter speed, aperture value, etc.) based on the photometry result in the photometry unit 46, and outputs a control signal corresponding to the calculation result to the shutter control unit 40. It will be. Note that the driving of the shutter 12 is performed together with the driving of the diaphragm 312. In the present embodiment, the shutter 12 has a flash light control function in which the driving of the shutter 12 is performed together with the driving of the illumination unit 84.

  Reference numeral 42 denotes a focus detection unit for detecting the focus adjustment state of the photographing optical system. Here, light rays incident on the photographing lens 310 are a stop 312, a lens mount 306, a camera mount 106, a mirror 130 obliquely arranged on the photographing optical path, and a sub-mirror (not shown) provided on the back surface of the mirror 130. ) To enter the focus detector 42. Since the light receiving surface of the focus detection unit 42 has a conjugate relationship with the image surface, it is possible to measure the in-focus state of the image formed as an optical image.

  Reference numeral 46 denotes a photometric unit for measuring subject luminance. Here, the light beam incident on the photographing lens 310 is incident on the photometry unit 46 via the aperture 312, the lens mount 306, the camera 106, the mirror 130 in the oblique state, the mirror 132, and a photometric lens (not shown). It has become. Thereby, the exposure state of the image formed as an optical image can be measured using the photometry unit 46.

  Reference numeral 48 denotes an illumination unit that irradiates the subject with illumination light, and has an AF auxiliary light projecting function and a flash light control function.

  In addition to performing the drive control of the shutter 12 and the aperture 312 based on the photometric result in the photometric unit 46, based on the calculation result calculated by the image processing unit 20 on the image data captured by the image sensor 14. The system control unit 50 performs drive control of the shutter control unit 40 and the aperture control unit 340, so that exposure control using the video TTL method can be performed. In addition to performing AF control based on the output of the focus detection unit 42, the system control unit 50 performs AF control by performing drive control of the focus control unit 342 based on the calculation result of the image processing unit 20. be able to.

  Furthermore, AF (autofocus) control may be performed using both the measurement result by the focus detection unit 42 and the calculation result calculated by the image processing unit 20 on the image data captured by the image sensor 14. . Further, exposure control may be performed using both the measurement result by the photometry unit 46 and the calculation result calculated by the image processing unit 20 on the image data captured by the image sensor 14.

  Reference numeral 50 denotes a system control unit that controls the overall operation of the digital camera 100, and 52 denotes a memory that stores constants, variables, programs, and the like for the operation of the system control unit 50.

  Reference numeral 54 denotes an information output unit that outputs information related to the operating state and messages in the camera system using characters, images, sounds, and the like in accordance with the execution of the program in the system control unit 50. The information output unit 54 is provided in the vicinity of the operation unit provided in the digital camera 100, and is provided in a single or a plurality at a position where it can be easily seen, and is configured by a combination of, for example, an LCD, an LED, and a sounding element. . In addition, some functions of the information output unit 54 are provided in the optical viewfinder 104.

  Among the contents displayed on the information output unit 54, those displayed on the LCD or the like include single shot / continuous shooting display, self-timer display, compression rate display, number of recorded pixels, number of recorded images, number of remaining images that can be captured, and so on. , Shutter speed display, Aperture value display, Exposure compensation display, Flash display, Red-eye reduction display, Macro shooting display, Buzzer setting display, Clock battery level display, Battery level display, Error display, Multi-digit number information display , Attachment / detachment state display of the recording media 200 and 210, attachment / detachment state display of the lens unit 300, communication I / F operation display, date / time display, display showing a connection state with an external computer, and the like.

  Among the display contents in the information output unit 54, those displayed in the optical viewfinder 104 include in-focus display, photographing preparation completion display, camera shake warning display, flash charge display, flash charge completion display, shutter speed display, There are an aperture value display, an exposure correction display, a recording medium writing operation display, and the like.

  Further, among the display contents in the information output unit 54, what is displayed by the LED or the like includes in-focus display, shooting preparation completion display, camera shake warning display, flash charge display, flash charge completion display, recording medium writing operation display, Macro shooting setting notification display, secondary battery charge status display, and the like.

  And what is displayed with a lamp etc. among the display contents in the information output part 54 includes a self-timer notification. The light from the lamp when performing the self-timer notification may be shared with the AF auxiliary light.

  Reference numeral 56 denotes a nonvolatile memory capable of electrically erasing and recording data, and is composed of, for example, an EEPROM.

  Reference numerals 60, 62, 64, 66, 68, 70, 72, and 74 are operation members that are operated by the user in order to input various operation instructions to the system control unit 50. It is composed of one or a plurality of combinations such as a switch, dial, touch panel, pointing by line of sight detection, and a voice recognition device. Hereinafter, these operation members will be specifically described.

  Reference numeral 60 denotes a mode dial switch, which is an automatic shooting mode, a program shooting mode, a shutter speed priority mode, an aperture priority mode, a manual shooting mode, a depth of focus priority (depth) shooting mode, a portrait shooting mode, a landscape shooting mode, a close-up shooting mode, Each function shooting mode such as a sports shooting mode, a night view shooting mode, a panoramic shooting mode, and the like can be switched and set.

  A shutter switch (SW1) 62 is turned on when a shutter button (not shown) provided in the digital camera 100 is half-pressed to be turned on, and AF (autofocus) processing, AE (automatic exposure) processing, AWB (auto white balance) Instructs the start of photographing preparation operations such as processing and EF (flash pre-emission) processing.

  A shutter switch (SW2) 64 is turned on when the shutter button (not shown) is fully pressed, and the signal read from the image sensor 14 is written into the memory 30 via the A / D converter 16 and the memory control unit 22. Processing, development processing using calculation in the image processing unit 20 or the memory control unit 22, recording processing for reading out image data from the memory 30, compression in the compression / decompression unit 32, and writing the image data in the recording media 200 and 210 The start of a series of processing operations is instructed.

  Reference numeral 66 denotes an image playback switch, which is a playback operation in which image data obtained by shooting is read from the memory 30 or the recording media 200 and 210 and displayed on the image display unit 28 when the digital camera 100 is set to the shooting mode. Instruct the start.

  68 is a quick review switch (quick review selection means) operated by a user for setting a quick review function for automatically displaying a photographed image without performing an operation for confirming the photographed image immediately after photographing. Switch.

  An operation unit 70 includes various buttons and a touch panel. This operation unit includes ISO sensitivity setting buttons, menu buttons, set buttons, macro buttons, multi-screen playback page break buttons, flash setting buttons, single / continuous / self-timer switching buttons, menu movement + (plus) buttons, There are a menu shift- (minus) button, a playback image shift + (plus) button, a playback image- (minus) button, a shooting image quality selection button, an exposure correction button, and a date / time setting button. In addition, a selection / switch button for setting selection and switching of various functions when performing shooting and playback in panorama mode and the like, and a determination for setting and executing various functions when performing shooting and playback in panorama mode and the like. A compression mode switch, a shutter switch SW1, which is a switch for selecting a compression rate for compression / compression, or for selecting a CCD RAW mode in which the output signal of the image sensor 14 is directly digitized and recorded on the recording medium 200, 210. If pressed, AF (autofocus) operation starts. Once focused, the one-shot AF mode that keeps the in-focus state and servo AF mode that continues autofocus operation while the shutter switch SW1 is pressed There is an AF mode setting switch etc. that can set

  Each of the functions of the plus button and the minus button can be selected more easily with numerical values and functions by providing a rotary dial switch.

Reference numeral 72 denotes a MAC calculation switch ( operation means ) which is operated to select whether or not to attach a MAC for preventing falsification to the photographed image data. A power switch 74 is a switch for switching the power of the digital camera 100 on and off. The power switch 74 can also switch the power-on and power-off settings of various camera accessories such as the recording media 200 and 210 connected to the digital camera 100, the interchangeable lens 300, and an external strobe device.

  A MAC calculation unit (calculation unit) 76 calculates the MAC of the image data from the original image data developed after shooting, and outputs the MAC to the system control unit 50. In this embodiment, a hash function and a secret key encryption are used for the MAC calculation. The system control unit 50 adds the MAC generated by the MAC calculation unit 76 to the original image data.

  A power control unit 80 includes a power detection unit, a DC-DC converter, a switch unit that switches a block to be energized, and the like, and detects whether or not a battery is installed, the type of battery, and the remaining battery level. The DC-DC converter is controlled based on the result and an instruction from the system control unit 50, and a necessary voltage is supplied to each unit in the camera system including the recording medium for a necessary period.

  82 is a connector, 84 is a connector, 86 is a primary battery such as an alkaline battery or lithium battery, a secondary battery such as a NiCd battery, NiMH battery or Li battery, an AC adapter, or the like.

  Reference numerals 90 and 94 denote interfaces with the recording media 200 and 210 such as a memory card and a hard disk, reference numerals 92 and 96 denote connectors for connecting the recording media 200 and 210 such as a memory card and a hard disk, and reference numeral 98 denotes a recording medium 200 connected to the connectors 92 and 96. , 210 is a recording medium attachment / detachment detection unit for detecting whether or not 210 is attached.

  In this embodiment, it is assumed that there are two interfaces and connectors for attaching the recording medium. Of course, the interface and connector for attaching the recording medium may have a single or a plurality of systems.

  The interface and connector may be configured using a PCMCIA card, a CF (Compact Flash (registered trademark)) card, or the like that conforms to the standard. Further, when the interfaces 90 and 94 and the connectors 92 and 96 are configured using a PCMCIA card, a CF (compact flash) card, or the like, a LAN card, a modem card, a USB card, an IEEE 1394 card, a P1284 card, By connecting various communication cards such as a SCSI card and a communication card such as PHS, image data and management information attached to the image data can be transferred to and from other computers and peripheral devices such as a printer.

  Reference numeral 104 denotes an optical viewfinder. The light beam incident on the photographic lens 310 is guided to the optical viewfinder 104 via the aperture 312, the lens mount 306, the camera mount 106, the mirror 130 in the oblique state, and the mirror 32. As a result, the user can observe the subject image on the optical viewfinder 104, and can take an image using only the optical viewfinder 104 without using the electronic viewfinder function of the image display unit 28. In the optical viewfinder 104, some display functions on the display unit 54, for example, focus display, camera shake warning display, flash charge display, shutter speed display, aperture value display, exposure correction display, and the like are performed.

  A camera mount 106 mechanically couples the digital camera 100 with the interchangeable lens 300. The camera mount 106 includes various functions for electrically connecting the digital camera 100 and the interchangeable lens 300.

  A communication unit 110 has various communication functions such as RS232C, USB, IEEE1394, P1284, SCSI, modem, LAN, and wireless communication. Reference numeral 112 denotes a connector for connecting the digital camera 100 to another device or an antenna in the case of wireless communication.

  120 is an interface for connecting the digital camera 100 and the interchangeable lens 300 in the camera mount 106, and 122 is a communication between the digital camera 100 (system control unit 50) and the interchangeable lens 300 (lens control unit 350). This is a connector that can be used. The connector 122 communicates a control signal, a status signal, a data signal, and the like between the digital camera 100 and the interchangeable lens 300, and has a function for supplying various voltages. Further, the connector 122 may be configured to transmit not only electrical communication but also optical communication, voice communication, and the like.

  Reference numerals 130 and 132 denote mirrors, which can guide the light beam incident on the photographing lens 310 to the optical viewfinder 104 in a state where the mirror 130 is obliquely arranged on the photographing optical path. The mirror 132 can be configured as a quick return mirror or a half mirror.

  Reference numerals 200 and 210 denote recording media such as a memory card and a hard disk. Each of the recording media 00 and 210 includes recording units 202 and 212 configured by a semiconductor memory, a magnetic disk, and the like, interfaces 204 and 214 with the digital camera 100, and connectors 206 and 216 that connect the digital camera 100. I have.

  Reference numeral 306 denotes a lens mount for mechanically coupling the interchangeable lens 300 to the digital camera 100. The lens mount 306 includes various functions for electrically connecting the interchangeable lens 300 and the digital camera 100.

  Reference numeral 310 denotes a photographing lens. Although only one photographing lens is displayed in FIG. 1, it is actually composed of a plurality of lens groups. Reference numeral 312 denotes a stop that adjusts the amount of light incident on the image plane by changing the opening area of the light passage opening. 320 is an interface for connecting the interchangeable lens 300 to the digital camera 100 in the lens mount 306, and 322 is a connector for electrically connecting the interchangeable lens 300 to the digital camera 100.

  The connector 322 transmits a control signal, a status signal, a data communication signal, and the like between the digital camera 100 and the interchangeable lens 300, and also has a function of supplying various voltages. Further, the connector 322 may be configured to transmit not only electrical communication but also optical communication, voice communication, and the like.

  Reference numeral 340 denotes an aperture control unit that controls driving of the aperture 312 based on the output of the lens control unit 350. Here, the lens control unit 350 receives a control signal for the diaphragm 312 through communication with the system control unit 50, and outputs a control signal corresponding to the control signal to the diaphragm control unit 340.

  A focus control unit 342 controls driving of the focus lens of the photographing lens 310 based on the output of the lens control unit 350, and 344 controls driving of a zoom lens of the photographing lens 310 based on the output of the lens control unit 350. A zoom control unit.

  A lens control unit 350 controls the overall operation of the interchangeable lens 300. The lens control unit 350 includes a memory for recording operation constants, variables, programs and the like, identification information such as a number unique to the interchangeable lens 300, management information, function information such as an open aperture value, a minimum aperture value, a focal length, It also has a non-volatile memory function for holding current and past set values.

  Next, the operation of the camera system according to the present embodiment will be described with reference to FIGS. 2 to 7, 9, and 10.

  2 and 3 show a flowchart of a main routine in the digital camera 100 of the present embodiment. The operation of the digital camera 100 will be described with reference to FIGS.

  When the power is turned on such as battery replacement, the system control unit 50 initializes flags, control variables, and the like, and performs predetermined initial settings necessary for each unit in the digital camera 100 (S101).

  The system control unit 50 determines the setting state of the power switch 74. If the power switch 74 is set to the power OFF state (S102), the system control unit 50 changes the display on the display unit 28 to the end state, and sets a flag or control variable. Necessary parameters including the above, setting values, and setting modes are recorded in the nonvolatile memory 56. Then, after performing predetermined end processing such as cutting off the power supplied to each part in the digital camera 100 including the image display unit 28 by the power control unit 80 (S103), the process returns to S102.

  On the other hand, if the power switch 74 has been set to the power ON state (S102), the system control unit 50 indicates that the remaining capacity and operation status of the power source 86 configured by the power control unit 80, such as a battery, is the operation of the digital camera 100. (S104). If there is a problem, a predetermined warning is given by image or sound using the information output unit 54 (S105), and the process returns to S102.

  If there is no problem with the power supply 86 (S104), the system control unit 50 determines the setting state of the mode dial 60. If the mode dial 60 is set to the shooting mode (S106), the process proceeds to S108. Here, if the mode dial 60 is set to a mode other than the shooting mode (S106), the system control unit 50 executes processing according to the selected mode (S107), and if the processing is completed. Return to S102.

  Next, the system control unit 50 determines whether the recording mediums 200 and 210 are attached to the digital camera 100 based on the output of the recording medium attachment / detachment detection unit 98, and the image data recorded on the recording media 200 and 210. The management information is acquired, and it is determined whether or not the operation state of the recording media 200 and 210 has a problem in the operation of the digital camera 100, particularly the recording / reproducing operation of the image data with respect to the recording medium (S108). Then, after giving a predetermined warning by image or sound using the information output unit 54 (S105), the process returns to S102. On the other hand, if there is no such problem, the process proceeds to S109.

  In response to the user's operation of the quick review switch 68, the system control unit 50 receives an input (ON signal or OFF signal) from the quick review switch 68 (S109).

  In this embodiment, the user can easily set the quick review function using the image display unit 28. FIG. 9A shows an example of display contents displayed on the image display unit 28 when setting the quick review function. That is, in response to the user operating the quick review switch 68, the display on the image display unit 28 is switched between the ON region and the OFF region.

Further, the system control unit 50 receives an input (ON signal or OFF signal) from the MAC calculation switch 72 according to the user's operation of the MAC calculation switch 72 (S109). The setting of the MAC operation switch 72 can also be easily set by the user using the image display unit 28. FIG. 9B shows an example of display contents displayed on the image display unit 28 when setting whether to attach the MAC to the image data. That is, in response to the user manipulating the MAC operation switch 72, display on the image display unit 28 is adapted to switches between ON region and the OFF region.

  The system control unit 50 acquires the contents set in the digital camera 100 (S110). The setting content acquired here is whether or not the quick review function is set and whether or not the MAC is attached to the image data immediately after shooting. Details of the operation related to setting content acquisition in S110 will be described later with reference to FIG. The acquired setting contents are stored in the internal memory or the memory 52 of the system control unit 50.

  The system control unit 50 determines the ON / OFF state of the shutter switch SW1 (S121), and returns to S102 if it is in the OFF state. On the other hand, if the shutter switch SW1 is in the ON state (S121), the system control unit 50 moves the focus lens of the photographing lens 310 to the in-focus position by the focus adjustment operation, and determines the aperture value and the shutter time by the photometric operation. (S122), the process proceeds to S123. In the photometric operation, if necessary (if the subject is dark), the illumination unit 48 is set to emit light. Details of the focus adjustment / photometry operation will be described later with reference to FIG.

  The system control unit 50 determines the ON / OFF state of the shutter switch SW2 (S123), and if it is OFF, repeats the current processing until the shutter switch SW1 is turned OFF (S124). If the shutter switch SW1 is turned off (S124), the process returns to S102.

  On the other hand, when the shutter switch SW2 is in the ON state (S123), the system control unit 50 determines whether or not the memory 30 has an image storage buffer area capable of storing captured image data (S125). If there is no area capable of storing new image data in the image storage buffer area of the memory 30, a predetermined warning is given by an image or sound using the information output unit 54 (S126), and the process returns to S102.

  As a case where there is no area in which the new image data can be stored, for example, immediately after the maximum number of continuous shots that can be stored in the image storage buffer area of the memory 30, the storage medium 200 is read out from the memory 30. , 210, the first image data to be written is still unrecorded in the recording media 200, 210, and one empty area is still not secured in the image storage buffer area of the memory 30.

  When the captured image data is compressed and stored in the image storage buffer area of the memory 30, it can be stored in consideration of the fact that the amount of image data after compression varies depending on the compression mode setting. In S125, it is determined whether or not there is an area on the image storage buffer area of the memory 30.

  If there is an image storage buffer area capable of storing the image data captured in the memory 30 (S125), the system control unit 50 reads out the image signal accumulated for a predetermined time by the exposure operation from the image sensor 14 and performs A / D. A photographing process for writing image data photographed in a predetermined area of the memory 30 through the converter 16, the image processing unit 20, the memory control unit 22, or directly from the A / D converter through the memory control unit 22 is executed. (S127). Details of this photographing process will be described later with reference to FIG.

  When the photographing process (S127) described above is completed, the process proceeds to S128.

  The system control unit 50 reads out part of the image data written in a predetermined area of the memory 30 via the memory control unit 22 and performs WB (white balance) integration calculation processing, OB ( Optical black) Integration calculation processing is performed, and the calculation result is stored in the internal memory or the memory 52 of the system control unit 50.

  Then, the system control unit 50 uses the memory control unit 22 (the image processing unit 20 as necessary) to read the captured image data written in a predetermined area of the memory 30, and the internal memory or memory of the system control unit 50 Using the calculation result stored in 52, various development processing including AWB (auto white balance) processing, gamma conversion processing, and color conversion processing is performed on the read image data (S128).

  Further, in the development process (S128), the dark image capturing process (the process of reading the accumulated charge signal from the image sensor 14 in the non-exposure state) performs the subtraction process using the dark image data captured, thereby Dark correction calculation processing for canceling dark current noise and the like is also performed.

  Then, the system control unit 50 causes the compression / decompression unit 32 to perform image compression processing corresponding to the set mode on the developed image data (S129), and the image data to which the MAC is added as described later. Is created (S130), and the image data that has undergone the above-described series of processing is written into the empty area of the image storage buffer area of the memory 30.

  The system control unit 50 reads out the image data stored in the image storage buffer area of the memory 30 in accordance with the execution of the above-described series of operations, and uses a memory card or a compact unit via the interfaces 90 and 94 and the connectors 92 and 96. Recording processing for writing to the recording media 200 and 210 such as a flash card is started (S131). This recording process is performed on the image data every time new image data is written in the empty area of the image storage buffer area of the memory 30.

  In order to clearly indicate that the writing operation is being performed while the image data is being written to the recording media 200 and 210, the information output unit 54 displays a recording medium writing operation display such as blinking an LED. .

  The system control unit 50 determines the ON / OFF state of the shutter switch SW1 (S132). If the shutter switch SW1 is in the OFF state (S132), the process returns to S102. If the shutter switch SW1 is in the ON state (S132), the process returns to S123, and the processes from S123 to S132 are repeated until the SW1 is in the OFF state.

  FIG. 4 shows a detailed flowchart of setting content acquisition in S110 of FIG.

  In the figure, the system control unit 50 determines the ON / OFF state of the quick review switch 68 (S201), and if it is ON, sets a quick review flag (S202), and the quick review switch 68 is OFF. If so, the quick review flag setting is canceled (S203).

  Next, the ON / OFF state of the MAC operation switch 72 is determined (S204). If the MAC operation switch is in the ON state, a MAC operation flag is set (S205), and if the MAC operation switch is in the OFF state. Then, the setting of the MAC calculation flag is canceled (S206).

  Note that the ON / OFF state of the quick review switch 68 and the MAC calculation switch 72 is switched by the user's operation as described above, and is set in advance before the setting content acquisition operation (S110) in FIG. It shall be.

  Here, the setting contents of the quick review flag and the MAC calculation flag described above are stored in the internal memory or the memory 52 of the system control unit 50. When all the information has been acquired, the setting content acquisition routine (S110) is terminated.

  FIG. 5 shows a detailed flowchart of the focus adjustment / photometry process in S122 of FIG. Note that various signals are exchanged between the system control unit 50 and the aperture control unit 340 or the focus control unit 342 in the focus adjustment / photometry processing through the interface 120, the connector 122, the connector 322, the interface 320, and the lens control unit 350. Done.

  The system control unit 50 starts processing for determining the focus adjustment state of the imaging optical system based on the output signal of the image sensor 14 or the output of the focus detection unit 42 (S301).

  Here, when the focus detection unit 42 is used, the system control unit 50 controls the driving of the mirror 130 via a driving mechanism (not shown) so that the mirror 130 is inclined, and enters the photographing lens 310. The incident light beam is incident on the focus detection unit 42 via the aperture 312, the lens mount 306, the camera mount 106, the mirror 130, and a distance measuring sub-mirror (not shown). Thereby, the subject light is received by the focus detection unit 42, and the system control unit 50 can determine the focus adjustment state of the photographing optical system based on the output of the focus detection unit 42.

  Here, the system control unit 50 outputs a control signal to the focus control unit 342 via the lens control unit 350, thereby moving the focus lens in the optical axis direction (S302). Then, until the photographing optical system is in focus (S303), the focus adjustment state of the photographing optical system is determined based on the output of the focus detection unit 42 while performing drive control of the focus lens.

  When it is determined that the photographing optical system is in focus (S303), the system control unit 50 determines a focus detection area in focus from a plurality of focus detection areas provided in the photographing screen ( In step S <b> 304, the focus adjustment data and / or setting parameters (lens position, etc.) are stored in the internal memory or the memory 52 together with the data relating to the determined focus detection area.

  Subsequently, the system control unit 50 starts a photometric process (AE process) by outputting a control signal to the photometric unit 46 (S305). It is possible to perform photometric processing based on the output of the image sensor 14.

  The system control unit 50 performs drive control of the mirror 130 via a drive mechanism (not shown) so that the mirror 130 is in an obliquely arranged state, so that the light incident on the photographing lens 310 can be converted into an aperture 312, a lens mount 306, The light is incident on the photometry unit 46 via the camera mount 106, the mirror 130, the mirror 132, and a photometric lens (not shown). Thereby, the subject light is received by the photometry unit 46, and the system control unit 50 can calculate the exposure value based on the output of the photometry unit 46 (S306).

  If the system control unit 50 determines that the exposure is appropriate (S307), the photometry data and / or the setting parameters are stored in the internal memory or the memory 52, and the process proceeds to S308.

  The system control unit 50 sets the aperture value (Av value) and the shutter speed (Tv value) according to the exposure (AE) result detected in the photometric process (S306) and the shooting mode set by the mode dial 60. decide.

  Then, in accordance with the shutter speed (Tv value) determined here, the system control unit 50 determines the charge accumulation time of the image sensor 14 and performs the photographing process and the dark capturing process with the same charge accumulation time.

  In addition, the system control unit 50 determines whether or not the illumination unit 48 needs to emit light based on the measurement data (brightness of the subject) obtained in the photometric processing (S306) (S308). If necessary, the lighting flag is set, and the charging in the lighting unit 48 is performed (S309) until the charging in the lighting unit 48 is completed (S310). When the charging in the illumination unit 48 is completed (S310), or when it is not necessary to cause the illumination unit 48 to emit light, the focus adjustment / photometry processing routine (S122) is terminated.

  FIG. 6 shows a detailed flowchart of the photographing process in S127 of FIG. Note that various types of signals are exchanged between the system control unit 50 and the aperture control unit 340 in imaging processing via the interface 120, the connector 122, the connector 322, the interface 320, and the lens control unit 350.

  The system control unit 50 moves the mirror 130 to the mirror-up position retracted from the imaging optical path by drive control of a mirror drive mechanism (not shown) (S401), and photometry stored in the internal memory or the memory 52 of the system control unit 50 A control signal corresponding to the data (aperture value) is output to the aperture controller 340 via the lens controller 350. Thereby, the aperture 312 is driven to a predetermined aperture value (S402).

  After performing the charge clear operation of the image sensor 14 (S403), the system control unit 50 starts charge accumulation in the image sensor 14 (S404). Then, by outputting a control signal to the shutter control unit 40, the shutter 12 is opened and driven (S405), and exposure on the image sensor 14 is started (S406).

  Here, the system control unit 50 determines whether or not the illumination unit 48 needs to emit light based on the setting state of the illumination flag (S407), and if necessary, causes the illumination unit 48 to emit light (S408). .

  The system control unit 50 waits for the exposure of the image sensor 14 to end based on the photometric data (Tv value determined in S122 of FIG. 3) (S409), and closes and drives the shutter 12 via the shutter control unit 40 (S410). ), The exposure of the image sensor 14 is terminated.

  Then, the system control unit 50 outputs a control signal to the aperture control unit 340 to drive the aperture 12 to the open aperture value (S411), and the mirror 130 is controlled by drive control of a mirror drive mechanism (not shown). The mirror is moved to the mirror down position (slanting state) (S412).

  If the charge accumulation time set in S122 of FIG. 3 has elapsed (S413), the system control unit 50 reads out the charge signal from the image sensor 14 after completing the charge accumulation of the image sensor 14 (S414). The photographed image data is written to a predetermined area of the memory 30 via the / D converter 16, the image processing unit 20, the memory control unit 22, or directly from the A / D converter 16 via the memory control unit 22 (S415). ). When the series of processes described above is finished, the photographing process routine (S127) is finished.

  FIG. 7 shows a detailed flowchart of the MAC processing in S130 of FIG. Note that the MAC calculation is performed via the system control unit 50 and the MAC calculation unit 76.

  The information of the MAC calculation flag stored in the internal memory of the system control unit 50 or the memory 52 is read (S501). Next, information on the quick review flag is read (S502).

  If the MAC calculation flag read in S501 is set (S503) and the quick review flag read in S502 is set (S504), the image display unit 28 is connected to the image display unit 28 via the D / A converter 26 as shown in FIG. The image data generated by the photographing process of S127 is displayed (quick review display) (S505).

  FIG. 10 shows an example of display contents displayed on the image display unit 28 in the quick review display. In the figure, the image display unit 28 displays image data 40 generated by the shooting process, and also displays setting information (ON / OFF display) as to whether or not to attach the MAC to the shot image data. ing.

  Here, the display content that is initially displayed on the image display unit 28 in S505 is the display content with the setting for attaching the MAC to the captured image data (a state in which the ON region is selected in FIG. 10).

  In this display state, the system control unit 50 determines whether or not to attach the MAC to the image data again (S506) until the time during which the quick review is displayed on the image display unit 28 reaches a predetermined time (S507). ) Repeat. Thus, until the predetermined time elapses, the user can change the setting of whether to attach the MAC to the image data by operating the MAC calculation switch 72.

  If the MAC attachment setting is not changed (S506) and the quick review display time has passed a predetermined time (S507), the MAC calculation unit 76 calculates the MAC based on the captured image data. This is performed (S508). Then, image data with MAC is created by attaching the MAC obtained by the calculation to the photographed image data (S509), the quick review display is hidden (S510), and the MAC processing routine (S130) is terminated. .

  On the other hand, when the setting related to the attachment of the MAC is changed by the user's operation of the MAC calculation switch 72 before the quick review display time reaches the predetermined time, that is, when the setting is made so that the image data with MAC is not created ( In step S506, the quick review display is hidden (S510), and the MAC processing routine (S130) ends.

  As described above, when the setting is made so that the image data with MAC is not created, there is no need to perform the quick review display for changing the setting related to the creation of the image data with MAC. By doing so, unnecessary display can be suppressed and power saving of the camera system can be achieved.

  If the MAC calculation flag read in S501 is set (S503) and the quick review flag read in S502 is not set (S504), the MAC calculation unit 76 calculates the MAC without performing the quick review display. Then, image data with MAC is created (S509). Then, after the quick review display is set to the non-display state (S510), the processing routine (S130) is ended.

  If the MAC calculation flag read in S501 is not set (S503) and the quick review flag read in S502 is not set (S511), the MAC processing routine (S130) is terminated without doing anything.

  If the MAC calculation flag read in S501 is not set (S503) and the quick review flag read in S502 is set (S511), a quick review display is performed in the same manner as S505 (S512). Specifically, as shown in FIG. 10, the image display unit 28 displays the captured image data and setting information indicating whether or not to attach the MAC to the captured image data. Here, the content that is initially displayed on the image display unit 28 is the display content in a setting that does not attach the MAC to the captured image data (a state in which the OFF region is selected in FIG. 10).

  In the quick review display state, the system control unit 50 determines whether to create image data with MAC again (S513) until the quick review display time on the image display unit 28 reaches a predetermined time (S514). Repeat. Thereby, until the quick review display time reaches a predetermined time, it is possible to change the setting as to whether or not to create image data with MAC by the operation of the MAC calculation switch 72 by the user.

  Here, without changing the setting relating to the creation of the image data with MAC (S513), if the quick review display time has passed a predetermined time (S514), the quick review display is hidden (S510), and the MAC processing is performed. The routine (S130) ends.

  On the other hand, when the user changes the setting related to the creation of image data with MAC by operating the MAC calculation switch 72 before the quick review display time elapses, the setting is made to create image data with MAC. In this case (S513), MAC calculation is performed by the MAC calculation unit 76 (S508), and image data with MAC is created (S509). Then, after the quick review display is set to the non-display state (S510), this processing routine (S130) is ended.

  According to the present embodiment, the setting for creating image data with MAC can be changed in the quick review display after shooting. Forgetting the setting for creating image data with MAC before shooting as in the past. Even after this, it is possible to make a new setting after shooting, and the usability of the camera system can be improved.

  Moreover, since the captured image data is displayed in quick review in advance before the image data with MAC is created, it is possible to quickly determine whether the imaging has failed based on the displayed image data. .

  The present invention can also be applied to an embodiment in which a part of the first embodiment is changed. For example, the digital camera 100 according to the first embodiment can be replaced with a lens-integrated camera.

  For example, the MAC can be replaced with a digital signature which is an example of modification detection data. In this case, the MAC calculation unit 76 calculates a digital signature of the image data from the original image data, and replaces the digital signature with a digital signature calculation unit that outputs the digital signature to the system control unit 50. A hash function and public key cryptography can be used for the digital signature calculation.

  Next, a camera system according to Embodiment 2 of the present invention will be described. Since the configuration of the camera system of the present embodiment is the same as the configuration described in the first embodiment, the same reference numerals are given and description thereof is omitted.

  In the first embodiment, the setting for creating image data with MAC can be changed during the quick review display for confirming the captured image, and the quick review display time is set to a predetermined time in a state where the setting is for creating image data with MAC. Or when the setting is changed to create the image data with MAC during the quick review display, the MAC calculation unit 76 calculates the MAC.

  On the other hand, in the present embodiment, when the setting is made to create image data with MAC, the MAC operation unit 76 performs the MAC calculation during the quick review display.

  FIG. 8 is a flowchart showing a detailed operation of the MAC process (S130 in FIG. 3) in the present embodiment. Note that the MAC calculation is performed via the system control unit 50 and the MAC calculation unit 76. Further, operations other than the MAC processing (the operations shown in FIGS. 2 to 6) are the same as the operations described in the first embodiment.

  The system control unit 50 reads information on the MAC calculation flag stored in the internal memory or the memory 52 (S601). Also, information on the quick review flag is read (S602).

  If the MAC calculation flag read in S601 is set (S603) and the quick review flag read in S602 is set (S604), the image display unit 28 is connected to the image display unit 28 via the D / A converter 26. 3 displays the image data generated by the photographing operation in S127 (quick review display) (S605). A display example at this time is shown in FIG.

  In the quick review display (S605), information related to the setting of whether to attach the captured image data 400 and the MAC to the captured image data is displayed on the image display unit 28.

  At the same time or in parallel with the quick review display in S605, MAC calculation is performed by the MAC calculation unit 76 based on the photographed image data (S606), and image data with MAC is created (S607).

  In parallel with the creation of the image data with MAC, the determination of the setting state relating to the generation of the image data with MAC again (S608), the quick review display time on the image display unit 28 reaches the predetermined time, and the MAC is attached. The process is repeated until the creation of the image data is completed (S609). Accordingly, during the above period, the user can appropriately change the settings relating to the creation of image data with MAC by operating the MAC calculation switch 72.

  The quick review display can be performed until the creation of the image data with MAC is completed.

  Here, when the quick review display time reaches the predetermined time without operating the MAC calculation switch 72 and the creation of the image data with MAC is completed (S609), the quick review display is set to the non-display state (S609). S610), the process is terminated.

  On the other hand, when the user changes the setting related to the creation of image data with MAC by operating the MAC operation switch 72 during the above period, that is, when the setting is set so that the MAC is not attached to the captured image data (S608). The MAC calculation in the MAC calculation unit 76 is canceled (S611), the quick review display is hidden (S610), and this processing routine (S130) is terminated.

  If the MAC calculation flag read in S601 is set (S603) and the quick review flag read in S602 is not set (S604), the MAC calculation unit 76 calculates the MAC without displaying the quick review. (S612), image data with MAC is created (S613), and this processing routine (S130) is terminated.

  If the MAC calculation flag read in S601 is not set (S603) and the quick review flag read in S602 is not set (S614), the MAC processing routine (S130) is terminated without doing anything.

  If the MAC calculation flag read in S601 is not set (S603) and the quick review flag read in S602 is set (S614), a quick review display is performed in the same manner as in S605, as shown in FIG. In step S615, the captured image data and information regarding whether to attach the MAC to the captured image data are displayed.

  In this quick review display state, the system control unit 50 repeats the determination of the setting relating to the creation of image data with MAC (S616) again until the quick review display time on the image display unit 28 reaches a predetermined time (S617). Do. Thereby, the user can change the setting regarding creation of image data with MAC by operating the MAC calculation switch 72 until the quick review display time reaches a predetermined time.

  Here, if the quick review display time has passed the predetermined time without operating the MAC calculation switch 72 (S617), the quick review display is hidden (S610), and this processing routine (S130) is terminated. .

  In addition, when the setting related to the creation of image data with MAC is changed by operating the MAC calculation switch 72 before the quick review display time has passed the predetermined time, that is, when the setting is made to create image data with MAC. (S616), MAC calculation is performed by the MAC calculation unit 76 (S606). Then, in parallel with the creation of the image data with MAC (S607), the determination of the setting relating to the creation of the image data with MAC is again performed (S608), the quick review display time has passed a predetermined time, and the image data with MAC is created. (S609) The process is repeated.

  Here, if the setting for creating the image data with MAC is not changed (S608), the quick review display time has elapsed for a predetermined time, and the creation of the image data with MAC is completed (S609), the quick review display is turned off. The display state is set (S610), and this processing routine (S130) is terminated.

  Further, when the setting related to the generation of the image data with MAC is changed by the operation of the MAC calculation switch 72 (S608), that is, when the setting is made so that the image data with MAC is not created, the MAC calculation is canceled and the quick review display is displayed. The non-display state is set (S610), and this processing routine (S130) is terminated.

  According to the present embodiment, similar to the first embodiment, in the quick review display after shooting, the setting relating to the creation of the image data with MAC can be changed, so the same effect as the first embodiment can be obtained. . In addition, in this embodiment, since the MAC calculation is performed during the quick review display, the creation time of the image data with the MAC is shortened compared to the case where the MAC is calculated after the quick review display. Can do.

  The present invention can also be applied to an embodiment in which a part of the second embodiment is changed. For example, the digital camera 100 according to the second embodiment can be replaced with a lens-integrated camera.

  For example, the MAC can be replaced with a digital signature which is an example of modification detection data. In this case, the MAC calculation unit 76 calculates a digital signature of the image data from the original image data, and replaces the digital signature with a digital signature calculation unit that outputs the digital signature to the system control unit 50. A hash function and public key cryptography can be used for the digital signature calculation.

1 is a block diagram illustrating a configuration of a camera system in Embodiment 1. FIG. 3 is a part of a flowchart showing a main routine in the camera system of Embodiment 1. 3 is a part of a flowchart showing a main routine in the camera system of Embodiment 1. 3 is a flowchart of a setting content acquisition routine according to the first embodiment. 3 is a flowchart of a focus adjustment / photometry routine in the first embodiment. 3 is a flowchart of an imaging routine in Embodiment 1. 3 is a flowchart of a MAC processing routine in the first embodiment. 10 is a flowchart of a MAC processing routine in Embodiment 2. It is a figure which shows the example of a display in the image display part at the time of performing the setting (B) regarding creation (A) of quick review display, and creation of image data with MAC. It is a figure which shows the example of a display in the image display part in the quick review display after imaging | photography.

Explanation of symbols

12: Shutter 14: Image sensor 16: A / D converter 18: Timing generator
20: Image processing unit 22: Memory control unit 24: Image display memory
26: D / A converter 28: Image display unit 30: Memory 32: Image compression / decompression unit 40: Shutter control unit 42: Focus detection unit 46: Photometry unit 48: Flash
50: System control unit 52: Memory 54: Display unit 56: Non-volatile memory 60: Mode dial switch
62: Shutter switch SW1 64: Shutter switch SW2
66: Image playback switch 68: Quick review switch
70: Operation unit 72: MAC operation switch
74: Power switch 76: MAC operation unit 80: Power control unit 82: Connector 84: Connector 86: Power supply 90: Interface 92: Connector 94: Interface
96: Connector 98: Recording medium attachment / detachment detection unit 100: Camera 104: Optical viewfinder 106: Camera mount 110: Communication unit 112: Connector (or antenna)
120: interface 122: connector 130: mirror 132: mirror 200: recording medium 202: recording unit 204: interface 206: connector 210: recording medium 212: recording unit 214: interface 216: connector 300: interchangeable lens 306: lens mount
310: photographing lens 312: aperture 320: interface 322: connector 340: aperture control unit 342: focus control unit 344: zoom control unit 350: lens control unit

Claims (8)

An imaging device capable of selecting a shooting mode and another mode,
Imaging means for capturing a subject image and obtaining image data;
Arithmetic means for calculating alteration detection data for detecting alteration of the image data obtained by the imaging means ;
Operation means for selecting whether or not to add the alteration detection data to the image data;
Display means for displaying the image data by a quick review function for displaying the image data obtained by the imaging means in the photographing mode;
If the operation means is operated during the display of the first image data by the quick review function after shooting the first image data and before shooting the next second image data, the operation is performed according to the operation. An image pickup apparatus comprising: control means for determining whether to add the alteration detection data to the first image data. The image pickup apparatus according to claim 1, wherein the display unit automatically displays the image data by the quick review function when the photographing is performed. The imaging apparatus according to claim 1 , wherein the calculation unit calculates the modification detection data during display of the image data by the quick review function. Wherein, during the display of the image data by the quick review function, the selection for adding the modification detection data by the operation of the operating means is performed, the display until the operation of the modification detection data is completed The imaging apparatus according to claim 1 , wherein the imaging apparatus is continued. Claim wherein the control means, wherein during the display of the image data by the quick review function, the selection is not added to said modified detection data by the operating means is performed, characterized in that for stopping the display of the image data The imaging device according to any one of 1 to 4 . Said control means, said quick in operation of the modification detection data even during display of the image data by the review function, the selection is not added to said modified detection data is performed by the operation unit, the display of the image data The imaging apparatus according to claim 5, wherein the calculation is stopped. The display means, the quick any of claims 1, characterized in that display information for by review function to select whether or not to add the modified detection data during the display of the image data 6 in 1 The imaging device according to item . Having means operated by a user to select whether or not to use the quick review function;
When the non-use of the quick review function is selected, the control means determines whether to add the alteration detection data to the image data in accordance with the selection by the operation means before photographing the image data. The imaging device according to claim 1 , wherein the imaging device is determined.

Images