JP2006217249A - Electronic camera, electronic camera system and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic camera capable of suppressing the photographing failures of bracketing photography due to the movement of an object and coping with the bracketing photography by the parameters of various photographing conditions. <P>SOLUTION: The electronic camera is provided with an imaging device, a control part, a memory, and a movement amount computing part. The imaging device photoelectrically converts an object image by a photographing optical system and generates image signals. The control part changes the parameter of the photographing condition stepwise, executes the bracketing photography for two or more times, and generates image data based on the image signals. In the memory, reference image data in the photographing of the first time by the bracketing photography are stored. The movement amount computing part computes the movement amount of the object by comparing the reference image data with the image data in the photographing of the second and succeeding times by the bracketing photography. Then, the control part stops the bracketing photography when the movement amount is equal to or more than a threshold. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic camera and an electronic camera system having a bracketing shooting function, and more particularly, to an electronic camera and an electronic camera system that stops shooting according to the movement of a subject during bracketing shooting.

  2. Description of the Related Art Conventionally, an electronic camera having a bracketing shooting function for continuously shooting a plurality of frames while slightly changing shooting conditions of the same scene is known. This bracketing shooting is performed for subsequent selection of an appropriate image from a group of images shot by changing the shooting condition when it is difficult to determine an appropriate shooting condition. Therefore, in bracketing photography, it is important to keep the pose and composition of the subject being photographed almost constant.

In relation to the above, Patent Document 1 discloses an electronic camera that can obtain a plurality of images with different exposures by one photographing. Since the electronic camera disclosed in Patent Document 1 performs shooting only once, the pose or composition of the subject does not change between images. Patent Document 2 discloses a solid-state imaging device that detects the movement of a subject.
Japanese Patent Laid-Open No. 11-4380 Japanese Patent Laid-Open No. 11-177892

  However, in the above-described Patent Document 1, since shooting is performed only once, it is not possible to perform bracketing shooting in which, for example, the aperture value is changed and the depth of field is adjusted stepwise. That is, the bracketing photographing that can be realized in the above-mentioned Patent Document 1 is limited to the one related to the image processing parameters. On the other hand, Patent Document 2 does not describe bracketing photography and does not solve the above problem.

  The present invention is to solve the above-described problems of the prior art, and its purpose is to suppress bracketing shooting failure due to subject movement and to support bracketing shooting with parameters of various shooting conditions. An electronic camera and an electronic camera system are provided.

  An electronic camera according to a first aspect of the present invention executes an image pickup device that photoelectrically converts a subject image obtained by a shooting optical system to generate an image signal, and performs bracketing shooting a plurality of times by gradually changing parameters of shooting conditions. A control unit that generates image data based on the image signal, a memory that stores reference image data at the time of the first shooting in the bracketing shooting, and the reference image after the second shooting in the bracketing shooting. A motion amount calculating unit that calculates a motion amount of a subject by comparing data and the image data, and the control unit cancels the bracketing shooting when the motion amount is equal to or greater than a threshold value. Features.

In a second aspect based on the first aspect, the control unit drives the image sensor at predetermined intervals after the bracketing shooting is stopped to generate image data for restart determination, and the restart determination The bracketing photography is resumed when the amount of motion calculated from image data is less than a threshold value.
According to a third aspect, in the second aspect, the image data for resumption determination is set to have a smaller number of pixels than the image data at the time of bracketing shooting, and the motion amount calculation unit The amount of motion is calculated by associating the number with the number of pixels of the image data for restart determination.

According to a fourth aspect of the present invention, in the second or third aspect, when the bracketing photographing is not resumed within a predetermined time from the stop of the bracketing photographing, the control unit sets the image data for the resumption determination. The generation operation is stopped and the photographing is terminated.
In a fifth aspect based on the first to fourth aspects, the motion amount calculation unit calculates the motion amount based on a change in at least one of hue and luminance between the reference image data and the image data. It is characterized by.

  6th invention is an electronic camera system provided with the electronic camera and the imaging | photography control apparatus connected so that data communication was possible with respect to the said electronic camera. The electronic camera performs an image sensor that photoelectrically converts a subject image obtained by a photographing optical system to generate an image signal, and performs bracketing photographing a plurality of times by changing a parameter of photographing conditions in a stepwise manner. A camera-side control unit that generates image data based thereon. The photographing control device compares the reference image data with the image data after the second photographing in the bracketing photographing and a memory for storing the reference image data at the first photographing in the bracketing photographing. A motion amount calculation unit that calculates a motion amount of the subject, and a device-side control unit that causes the electronic camera to stop the bracketing shooting when the motion amount is equal to or greater than a threshold value.

  According to a seventh aspect of the present invention, there is provided an imaging device that photoelectrically converts a subject image obtained by a photographing optical system to generate an image signal, and a bracketing photographing that is performed a plurality of times by changing parameters of photographing conditions in a stepwise manner. An electronic camera having a camera-side control unit that generates image data based on the above, a memory and a device-side control unit, and a photographing control device that is connected to the electronic camera so that data communication is possible This is an electronic camera system program. In this program, the reference image data at the time of the first shooting in the bracketing shooting is acquired from the electronic camera and stored in the memory, and the reference image data after the second shooting in the bracketing shooting. Comparing the image data acquired from the electronic camera and calculating the amount of motion of the subject, and causing the electronic camera to stop the bracketing shooting when the amount of motion is equal to or greater than a threshold. It is executed by the device-side control unit.

  In the present invention, the reference image data at the time of the first shooting is compared with the image data after the second shooting, and the bracketing shooting is stopped when the movement amount of the subject is equal to or greater than the threshold value. In addition, a large number of shooting failure images with greatly different compositions are not taken. In the present invention, since shooting is performed a plurality of times during bracketing shooting, it is possible to cope with bracketing shooting in which the parameters of the shooting optical system are changed stepwise.

  FIG. 1 is a schematic diagram showing the configuration of the electronic camera of the first embodiment. The electronic camera according to the first embodiment includes a photographing lens 11, a lens driving mechanism 12, a diaphragm unit 13, a lens microcomputer 14, an image sensor 15, an analog signal processing unit 16, an A / D conversion unit 17, A CPU 18, an image processing unit 19, a motion amount calculation unit 20, a memory 21, a card I / F 22, a display I / F 23 and a monitor 24, an operation unit 25, and a data bus 26 are included. The A / D converter 17, the CPU 18, the image processor 19, the motion amount calculator 20, the memory 21, the card I / F 22, and the display I / F 23 are connected via a data bus 26.

  The photographing lens 11 includes a plurality of lens groups including a zoom lens and a focusing lens for adjusting focus. The lens driving mechanism 12 adjusts the position of the photographing lens 11 in the optical axis direction. The diaphragm 13 adjusts the diameter of the diaphragm by changing the positions of the plurality of diaphragm blades, and adjusts the amount of light incident on the image sensor 15. The lens microcomputer 14 controls the lens driving mechanism 12 and the diaphragm unit 13 based on an instruction from the CPU 18.

  The image sensor 15 is disposed on the image space side of the photographing lens 11. On the light receiving surface of the image sensor 15 (the surface facing the photographing lens 11), light receiving pixels for photoelectrically converting the subject image to generate an analog image signal are two-dimensionally arranged. The image signal of the image sensor 15 is used for generation of captured image data, AF calculation and AE calculation, and detection of the amount of movement of a subject in a bracketing shooting mode described later. The configuration of the image sensor 15 may be either a charge sequential transfer method (CCD or the like) or an XY address method (CMOS or the like).

The analog signal processing unit 16 includes a CDS circuit that performs correlated double sampling, a gain circuit that amplifies the output of the analog image signal, a clamp circuit that clamps the waveform of the input signal to a certain voltage level, and the like. The A / D conversion unit 17 converts the analog image signal output from the analog signal processing unit 16 into a digital image signal.
The CPU 18 controls the operation of each part of the electronic camera according to a sequence program stored in a ROM (not shown). For example, the CPU 18 performs the AF calculation by a hill-climbing operation that compares the magnitudes of the focus evaluation values before and after the focusing lens moves. The CPU 18 performs split photometry using the image signal of the image sensor 15, and executes AE calculation based on the split photometry result.

The CPU 18 performs mode switching such as “normal shooting mode” and “bracketing shooting mode” of the electronic camera in accordance with user input. In the “normal shooting mode”, the CPU 18 performs one shooting according to the release operation.
On the other hand, in the “bracketing shooting mode”, the CPU 18 performs shooting a plurality of times by changing the shooting condition parameters stepwise. In this “bracketing shooting mode”, the CPU 18 counts the number of frames shot by bracketing during shooting. Further, the CPU 18 determines whether or not to stop bracketing shooting based on the amount of movement of the subject (movement amount data) described later.

Note that in the “bracketing shooting mode”, the parameters that the CPU 18 changes for each shooting include (1) shutter speed, aperture value, exposure condition based on imaging sensitivity (gain of the analog signal processing unit 16), and (2) image. Examples include white balance setting in the processing unit 19, (3) position of the zoom lens, and (4) position of the focus lens.
The image processing unit 19 performs image processing such as gamma correction, interpolation, color correction, and white balance on the digital image signal to generate captured image data. In addition, the image processing unit 19 executes processing for compressing and expanding the captured image data in a predetermined format such as JPEG format.

When the white balance is changed in the “bracketing shooting mode”, the image processing unit 19 changes the white balance correction value (the gain value of each color of RGB) by a predetermined change amount for each frame.
Further, the image processing unit 19 generates image data for calculating the amount of movement of the subject during bracketing shooting. The image data for motion amount calculation is generated separately from the captured image data by the image processing unit 19 performing a part of image processing on the digital image signal. Note that the number of pixels of the image data for motion amount calculation may be the same as that of the captured image data, or the number of pixels is reduced by thinning out the pixels from the captured image data in order to speed up the motion amount calculation. Also good.

In the “bracketing shooting mode”, the motion amount calculation unit 20 moves based on the initial shooting amount (reference image data) of the image data for motion amount calculation and the image data for motion amount calculation after the second shooting. Generate quantity data.
The memory 21 is composed of SDRAM or the like and has a capacity capable of recording image data for a plurality of frames. The memory 21 temporarily stores digital image signals before image processing and photographed image data after image processing. In the “bracketing shooting mode”, an area for recording the reference image data is secured in the memory 21.

A connector for connecting the recording medium 27 is formed on the card I / F 22. The recording medium 27 is composed of a known semiconductor memory or the like, and the photographic image data after compression processing is finally recorded on the recording medium 27.
A monitor 24 is connected to the display I / F 23. The monitor 24 displays a captured image data reproduction screen, a setting screen for performing various settings of the electronic camera, and the like. The operation unit 25 includes an input member (command dial or the like) used for user input on the setting screen and a release button for release operation.

In the above setting screen, (1) setting of shooting mode, (2) selection of parameters to be changed by bracketing shooting, (3) upper limit value of the number of shooting frames in bracketing shooting, and (4) bracketing shooting. The amount of parameter change for each frame is input to the CPU 18.
The shooting operation in the bracketing shooting mode of the first embodiment will be described below with reference to the flowchart of FIG.

Step S101: The CPU 18 determines a parameter to be changed by bracketing shooting, an upper limit value of the number of shooting frames, and a parameter change amount for each frame based on a user input on the setting screen.
Step S102: The CPU 18 prepares for bracketing shooting by executing AF calculation, AE calculation, etc. by half-pressing the release button. If bracketing shooting that changes the position of the focus lens is selected in S101, the CPU 18 may be set to omit the AF calculation.

  Step S103: The CPU 18 starts bracketing shooting by fully pressing the release button. First, the CPU 18 drives the image sensor 15 to photograph the subject. The image processing unit 19 generates captured image data and image data for motion amount calculation. Then, the CPU 18 stores in the predetermined area of the memory 21 the first shooting amount (reference image data) of the image data for calculating the motion amount.

Step S104: The CPU 18 changes the shooting condition parameter setting based on the parameter change amount in S101.
Step S105: The CPU 18 drives the image sensor 15 to photograph the subject under photographing conditions different from those at the previous photographing. The image processing unit 19 generates captured image data and image data for motion amount calculation.

Step S106: The motion amount calculation unit 20 compares the reference image data (S103) in the memory 21 with the image data for motion amount calculation (S105) to generate motion amount data.
Specifically, first, the motion amount calculation unit 20 compares the reference image data with the image data for motion amount calculation. Then, the motion amount calculation unit 20 detects pixels (changed pixels) having a difference equal to or greater than a threshold value with respect to the luminance or hue of the reference image data in the image data for motion amount calculation. Thereafter, the motion amount calculation unit 20 generates motion amount data based on the number of the “pixels with change”.

Here, the motion amount calculation unit 20 detects the above “changed pixels” according to the parameters to be changed by bracketing shooting as follows.
(1) When the exposure condition is changed by any one of the shutter speed, the aperture value, and the imaging sensitivity, the brightness changes between the frames even if the subject does not move. Therefore, the motion amount calculation unit 20 detects pixels having a difference in hue that is equal to or greater than a threshold in the image data for motion amount calculation using the hue of the reference image data as a reference.

(2) When changing the white balance, the hue changes between frames even if the subject does not move. Therefore, the motion amount calculation unit 20 detects pixels having a difference in luminance that is equal to or greater than a threshold in the image data for motion amount calculation with reference to the luminance of the reference image data.
(3) When changing the position of the zoom lens, the size of the shooting screen does not correspond between the frames, so that the reference image data cannot be directly compared with the image data for motion amount calculation. Therefore, in this case, the image data for motion amount calculation is made the same size as the reference image data by the enlargement / reduction processing of the image processing unit 19. Thereafter, the motion amount calculation unit 20 detects pixels in which at least one of the luminance and the hue has a difference equal to or larger than a threshold in the image data for the motion amount calculation with reference to the luminance or the hue of the reference image data.

(4) When changing the position of the focus lens, it can be estimated that the subject is moving if the hues of the corresponding positions between the images are different. Therefore, the motion amount calculation unit 20 detects pixels having a difference in hue that is equal to or greater than a threshold in the image data for motion amount calculation using the hue of the reference image data as a reference.
Step S107: Based on the motion amount data (S106), the CPU 18 determines whether or not the motion amount of the subject in the captured image (S105) is less than a threshold value. If the amount of movement of the subject is less than the threshold (YES side), the process proceeds to S108. On the other hand, when the amount of movement of the subject is equal to or greater than the threshold (NO side), the pose and composition of the subject are greatly different from those at the first shooting, so the CPU 18 stops the next shooting operation and ends the bracketing shooting mode.

  Step S108: The CPU 18 determines whether or not the total number of shots in bracketing shooting is less than the upper limit value (S101) of the number of shooting frames. If the total number of shots is less than the upper limit (YES side), the process returns to S104, and the CPU 18 continues bracketing shooting. On the other hand, when the total number of shots reaches the upper limit (NO side), the CPU 18 ends the bracketing shot mode.

  In the first embodiment, the CPU 18 stops bracketing shooting when the amount of movement of the subject is greater than or equal to the threshold (that is, when the pose or composition of the subject has changed significantly during the process) (S107). For this reason, the pose and composition of the subject are kept almost constant between the frames that have undergone the bracketing shooting, and an image that can be compared with the first shooting image can be shot. In addition, a large number of unsuccessful shooting images that differ greatly in the pose and composition of the subject from the first shooting are not taken.

  Furthermore, in the first embodiment, since shooting is performed a plurality of times in the bracketing shooting mode, it is possible to support bracketing shooting in which the parameters of the shooting optical system are changed stepwise. Since the motion amount calculation unit 20 changes the motion amount determination method according to the parameter to be changed (S106), the motion of the subject can be detected with high accuracy in any bracketing shooting.

(Description of Second Embodiment)
The second embodiment is a modification of the first embodiment. In the following embodiments, the same reference numerals are given to the same components as those in the first embodiment, and description thereof will be omitted.
The electronic camera of the second embodiment has the same configuration as that of FIG. 1 and is different from the first embodiment in the following points. That is, when bracketing shooting is stopped, the CPU 18 drives the image sensor 15 at predetermined intervals and executes monitor shooting for restart determination until a predetermined time. Then, the CPU 18 determines whether or not to resume the bracketing shooting based on the motion amount data generated by the monitor shooting.

FIG. 3 is a flowchart showing the shooting operation in the bracketing shooting mode of the second embodiment. Note that S201 to S206 of the second embodiment correspond to S101 to S106 of the first embodiment, respectively, and thus description of overlapping portions is omitted.
Step S207: Based on the motion amount data (S206), the CPU 18 determines whether or not the motion amount of the subject in the captured image (S205) is less than a threshold value. If the amount of movement of the subject is less than the threshold (YES side), the process proceeds to S208. On the other hand, if the amount of movement of the subject is equal to or greater than the threshold (NO side), the process proceeds to S209.

  Step S208: The CPU 18 determines whether or not the total number of shots in bracketing shooting is less than the upper limit value (S201) of the number of shooting frames. If the total number of shots is less than the upper limit (YES side), the process returns to S204, and the CPU 18 continues bracketing shooting. On the other hand, when the total number of shots reaches the upper limit (NO side), the CPU 18 ends the bracketing shot mode.

Step S209: In this case, since the pose and composition of the subject are greatly different from those at the first shooting, the CPU 18 stops the bracketing shooting. Further, the CPU 18 starts time counting from the bracketing shooting stop.
Step S210: The CPU 18 executes monitor photographing for restart determination at a predetermined interval from the previous photographing. In this monitor photographing, the CPU 18 photographs the subject without changing the photographing condition parameters. The image processing unit 19 generates only image data for motion amount calculation (image data for resumption determination) based on the digital image signal captured by the monitor.

  Note that this restart determination image data may have a smaller number of pixels than the captured image data. In this case, it is possible to speed up the image reading at the time of monitor photographing and reduce the calculation load. In particular, when the reference image data is thinned out from the captured image data, the effect becomes more prominent if the number of pixels of the image data for resumption determination is matched with the reference image data.

Step S211: The motion amount calculation unit 20 compares the reference image data (S203) in the memory 21 with the image data for resumption determination (S210) to generate motion amount data. If the number of pixels of the reference image data is different from that of the image data for restart determination, the image processing unit 19 thins out the reference image data in advance to correspond to the number of pixels of the image data for restart determination.
Step S212: Based on the motion amount data (S211), the CPU 18 determines whether or not the motion amount of the subject at the time of monitor photographing is less than a threshold value. If the amount of movement of the subject is less than the threshold (YES side), the CPU 18 resets the time count and returns to S204 to resume bracketing shooting. On the other hand, when the amount of movement of the subject is equal to or greater than the threshold (NO side), the subject pose and composition remain largely different from those at the time of the first shooting, and the process proceeds to S213.

Step S213: The CPU 18 determines whether or not a predetermined time has elapsed since the bracketing photographing was stopped. When a predetermined time has elapsed from the cancellation (YES side), the CPU 18 ends the bracketing shooting mode. On the other hand, if the predetermined time has not elapsed since the cancellation (NO side), the CPU 18 returns to S210 and repeats the above operation.
According to the second embodiment, the following effects can be obtained in addition to the effects of the first embodiment. In the second embodiment, monitor shooting is performed after shooting is stopped to detect the amount of movement of the subject (S210, S211), and bracketing shooting is resumed when the amount of movement of the subject is less than the threshold (S212). ).

  Therefore, even in a situation where the pose or composition of the subject temporarily changes during bracketing shooting, it is possible to take an image that can be compared with the first shot image. For example, if a passerby crosses the front of the electronic camera during bracketing shooting, the bracketing shooting is stopped while the passerby is in the shooting screen, and the bracketing shooting is taken after the passerby passes. It can be resumed.

In the second embodiment, the bracketing shooting restart determination is terminated within a predetermined time (S213), so that the bracketing shooting is automatically ended when the pose of the subject has largely changed since the first shooting. Can do.
(Description of the third embodiment)
FIG. 4 is a schematic diagram showing the configuration of the electronic camera system of the third embodiment. The electronic camera system includes the electronic camera of the first embodiment and a photographing control device (for example, a personal computer). The electronic camera and the imaging control device are connected by a known wired or wireless communication standard so that data can be transmitted and received between them.

  In the electronic camera of the third embodiment, the CPU 18 performs bracketing shooting and monitor shooting described in the second embodiment based on an instruction from the shooting control device. Further, the image processing unit 19 generates image data for motion amount calculation at the time of shooting. Then, the CPU 18 transmits the image data for calculating the motion amount to the imaging control device. Note that captured image data obtained by bracketing imaging may be recorded on the recording medium 27 on the electronic camera side, or on the imaging control device side.

The imaging control apparatus includes a microprocessor 31, a memory 32 that stores reference image data, a display driver unit 34 that connects a monitor 33, an input device 35 such as a keyboard and a pointing device, and a system bus 36 that connects each unit. And have.
The microprocessor 31 causes the CPU 18 of the electronic camera to execute bracketing shooting or the like based on the control program of the electronic camera system. In the third embodiment, the microprocessor 31 sets “parameters to be changed by bracketing shooting”, “upper limit value of number of frames to be shot”, “parameter change amount for each frame”, “release timing”, and the like. It can be input to the CPU 18.

  Further, the microprocessor 31 calculates the motion amount of the subject based on the motion amount calculation image data (including the reference image data) received from the electronic camera. If the amount of motion of the subject is equal to or greater than the threshold, the CPU 18 of the electronic camera stops bracketing shooting. When bracketing shooting is stopped, the microprocessor 31 instructs the electronic camera to perform monitor shooting for resumption determination, and determines whether or not to resume bracketing shooting based on the amount of movement of the subject acquired by the monitor shooting. judge. Note that the motion amount calculation executed by the microprocessor 31 is performed in the same manner as in the first embodiment.

According to the electronic camera system of the third embodiment, it is possible to perform bracketing photographing similar to that of the first embodiment or the second embodiment. In the third embodiment, since the motion amount is calculated on the side of the imaging control device, the above bracketing imaging can be performed without providing a motion amount calculation unit or the like in the electronic camera.
(Correspondence between Claims and Embodiments)
Here, the correspondence between the claims and the embodiment is shown. Note that the correspondence relationships shown below are interpretations shown for reference only, and do not limit the technical scope of the present invention.

  The photographing lens 11 corresponds to the “photographing optical system”. The imaging element 15 corresponds to “imaging element”. The functions of the CPU 18 and the image processing unit 19 correspond to the “control unit” and “camera side control unit”. The memory 21 corresponds to the “memory” of the electronic camera, and the memory 32 corresponds to the “memory” of the electronic camera system. The motion amount calculator 20 corresponds to the “motion amount calculator” of the electronic camera. The microprocessor 31 corresponds to the “movement amount calculation unit” and “device side control unit” of the electronic camera system.

(Supplementary items of the embodiment)
As mentioned above, although this invention has been demonstrated by said embodiment, the technical scope of this invention is not limited to the said embodiment.
(1) In the above embodiment, the image data for motion amount calculation including the reference image data may be the captured image data itself.

(2) In the present invention, a part of the shooting screen may be cut out to generate image data for motion amount calculation, and it may be determined whether bracketing shooting is stopped or resumed in a partial area in the shooting screen. (3) In the electronic camera of the present invention, image data for motion amount calculation may be divided into a plurality of blocks, and the motion amount of the subject may be detected based on the motion vector of each block.
(4) The electronic camera of the present invention may be either a compact type or a single lens reflex type electronic camera.

Schematic diagram showing the configuration of the electronic camera of the first embodiment A flowchart showing photographing operation in the bracketing photographing mode of the first embodiment. A flowchart showing photographing operation in the bracketing photographing mode of the second embodiment. Schematic diagram showing the configuration of the electronic camera system of the third embodiment

Explanation of symbols

11 Shooting Lens 15 Image Sensor 18 CPU
19 Image processing unit 20 Motion amount calculation unit 21 Memory 31 Microprocessor 32 Memory

Claims (7)

An image sensor that photoelectrically converts a subject image by a photographing optical system to generate an image signal;
A control unit that executes a plurality of times of bracketing shooting by changing parameters of shooting conditions in stages, and generates image data based on the image signal;
A memory for storing reference image data at the time of the first shooting in the bracketing shooting;
A movement amount calculation unit that calculates the amount of movement of a subject by comparing the reference image data and the image data after the second shooting in the bracketing shooting,
The control unit stops the bracketing photographing when the amount of motion is equal to or greater than a threshold value.   The control unit generates image data for restart determination by driving the imaging device at predetermined intervals after the bracketing shooting is stopped, and the amount of motion calculated from the image data for restart determination is less than a threshold value The electronic camera according to claim 1, wherein the bracketing photographing is resumed in the case of. The image data for resumption determination is set to have a smaller number of pixels than the image data at the time of bracketing shooting,
The electronic camera according to claim 2, wherein the motion amount calculation unit calculates the motion amount by causing the number of pixels of the reference image data to correspond to the number of pixels of the image data for resumption determination.   The control unit, when the bracketing shooting is not resumed within a predetermined time from the stop of the bracketing shooting, stops the operation of generating the image data for the resumption determination and ends the shooting. The electronic camera according to Item 2 or Claim 3.   5. The motion amount calculation unit calculates the motion amount based on a change in at least one of hue and luminance between the reference image data and the image data. The electronic camera according to item. An electronic camera system comprising an electronic camera and a photographing control device connected to the electronic camera so that data communication is possible,
The electronic camera performs an image sensor that photoelectrically converts a subject image obtained by a photographing optical system to generate an image signal, and performs bracketing photographing a plurality of times by changing a parameter of photographing conditions in a stepwise manner. A camera-side control unit that generates image data based on
The photographing control device compares the reference image data with the image data after the second photographing in the bracketing photographing and a memory for storing the reference image data at the first photographing in the bracketing photographing. An electronic camera system comprising: a movement amount calculation unit that calculates a movement amount of the subject; and a device-side control unit that causes the electronic camera to stop the bracketing shooting when the movement amount is equal to or greater than a threshold value. . An image sensor that photoelectrically converts the subject image from the photographic optical system to generate an image signal, and executes multiple bracketing shots by changing the parameters of the shooting conditions in stages, and generates image data based on the image signal An electronic camera having a camera-side control unit,
An electronic camera system program comprising a memory and a device-side control unit, and a photographing control device connected to the electronic camera so that data communication is possible,
A procedure of acquiring reference image data at the time of first shooting in the bracketing shooting from the electronic camera and storing it in the memory;
A procedure for calculating the amount of movement of a subject by comparing the reference image data and the image data acquired from the electronic camera after the second shooting in the bracketing shooting;
A procedure for causing the electronic camera to stop the bracketing shooting when the amount of movement is equal to or greater than a threshold;
For causing the apparatus-side control unit to execute.

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