JP2006067452A - Video recording apparatus, and electronic camera - Google Patents

Video recording apparatus, and electronic camera Download PDF

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Publication number
JP2006067452A
JP2006067452A JP2004250191A JP2004250191A JP2006067452A JP 2006067452 A JP2006067452 A JP 2006067452A JP 2004250191 A JP2004250191 A JP 2004250191A JP 2004250191 A JP2004250191 A JP 2004250191A JP 2006067452 A JP2006067452 A JP 2006067452A
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Japan
Prior art keywords
still image
video recording
recording apparatus
unit
subject
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JP2004250191A
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Japanese (ja)
Inventor
Toshiya Aikawa
Yuko Hattori
Tetsuo In
Yukako Matsumoto
Keiichi Nitta
Kenji Suzuki
哲生 因
啓一 新田
佑子 服部
由佳子 松本
敏哉 相川
健司 鈴木
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Nikon Corp
株式会社ニコン
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Priority to JP2004250191A priority Critical patent/JP2006067452A/en
Publication of JP2006067452A publication Critical patent/JP2006067452A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a technique for photographing a clear still image.
A video recording apparatus according to the present invention is a video recording apparatus that records an image acquired from an imaging unit, and includes a moving image acquisition unit, a motion detection unit, and a still image recording unit. The moving image acquisition unit acquires a moving image from the imaging unit. The motion detection unit detects a motion amount from the moving image. When the still image recording unit satisfies a subject stationary condition that is one of “the detected motion amount is smaller than a predetermined threshold” and “the detected motion amount is minimal”, the still image recording unit Acquire and record images.
[Selection] Figure 2

Description

  The present invention relates to a technique for recording a clear still image with less camera shake and subject blur by controlling the shooting timing of a still image.

Patent Document 1 below discloses an electronic camera having a BSS (best shot selector) mode. In this BSS mode, first, still images are continuously shot, and from the obtained still images, those with little blur and a lot of image information (for example, those with a large compression code amount) are selectively stored.
By using this BSS mode, it is possible to reliably shoot a clear still image with less blur.
JP 2000-209484 A (Claim 1)

By the way, in the above-described BSS mode, it is necessary to repeat still image shooting a plurality of times. For this reason, in an electronic camera having a slow continuous image capturing speed, it takes time to complete a plurality of continuous image capturing operations. During that period, the photographer had to keep holding the electronic camera as little as possible, and there was room for improvement in that respect.
In view of the above, an object of the present invention is to provide a new technique for capturing a still image with less blur.

<< 1 >>
The video recording apparatus of the present invention is a video recording apparatus that records an image acquired from an imaging unit, and includes a moving image acquisition unit, a motion detection unit, and a still image recording unit.
The moving image acquisition unit acquires a moving image from the imaging unit.
The motion detection unit detects a motion amount from the moving image.
When the still image recording unit satisfies a subject stationary condition that is one of “the detected motion amount is smaller than a predetermined threshold” and “the detected motion amount is minimal”, the still image recording unit Acquire and record images.

<< 2 >>
Preferably, the video recording apparatus includes a release unit that receives a shooting instruction. The still image recording unit receives a shooting instruction from the release unit and acquires and records a still image from the imaging unit when the subject stationary condition is satisfied.

<< 3 >>
Preferably, the video recording apparatus further includes a shift continuous shooting mode selection unit in which a continuous shooting speed of a still image changes. When the variable speed continuous shooting mode is selected, the still image recording unit shortens the time interval of continuous shooting recording as the amount of motion detected from the moving image decreases.

<< 4 >>
Preferably, the motion detection unit detects the maximum amount of motion from a plurality of locations in the screen.

<< 5 >>
Preferably, the motion detection unit detects a minimum amount of motion from a plurality of locations in the screen.

<< 6 >>
Preferably, the video recording apparatus includes a subject instruction unit that instructs and inputs a specific subject. The motion detection unit detects and tracks the movement of the specific subject in the screen from the moving image, and continuously detects the movement of the specific subject.

<< 7 >>
Preferably, the still image recording unit records the position of the specific subject in association with the still image.

<< 8 >>
Preferably, the still image recording unit records the still image by trimming or electronic zooming so that the specific subject is included in the screen.

<< 9 >>
An electronic camera according to the present invention includes the video recording device according to any one of the above << 1 >> to << 8 >> and an imaging unit that images a subject and outputs a moving image and a still image.

(1)
In the present invention, a moving image is acquired from the imaging unit, and the amount of movement is detected from the moving image.
When the amount of motion detected from this moving image is smaller than a predetermined threshold, it can be considered that the subject is stationary with respect to the screen. Further, even when the moving amount of the moving image is minimal, it can be considered that the subject is stationary with respect to the screen.

Therefore, in the present invention, the timing at which the subject does not shake with respect to the screen is determined by determining any one of the conditions that can be regarded as stationary as the subject stationary condition. The still image recording unit acquires and records a still image from the imaging unit in synchronization with this timing.
As a result, it is possible to obtain a still image with the subject substantially stationary with respect to the screen, and a still image with less camera shake and subject blur can be obtained with a high probability.

Note that when “movement amount threshold determination” is performed as the subject stationary condition, the stationary state of the subject is determined based on an absolute reference called a threshold. As a result, it is possible to objectively record still images with little camera shake or subject blur.
However, since the size of the blur varies from person to person, it may be difficult for some people to keep the blur below this threshold. In such a case, it is preferable to carry out “minimum determination of the amount of movement” as the subject stationary condition. In this “minimum determination of the amount of movement”, it is possible to determine a suitable timing at which the shake is reduced for the user. As a result, it is possible to record a still image with less blur that is preferable for the user.

  Preferably, the moving image acquired from the imaging unit is a low resolution image, and the still image is a high resolution image. In this case, since the processing cost of the moving image is reduced, the moving image can be acquired almost at real time and at a high frame rate. By determining the subject stationary condition for the high-speed frame rate moving image, it is possible to detect without missing a moment when the subject is stationary with respect to the screen. Therefore, it is not necessary to repeat still image shooting many times compared to the BSS mode, and clear still image shooting can be completed in a short time. As a result, it is not necessary to hold the electronic camera for a long time, and a clear still image with little blur can be taken easily.

(2)
Furthermore, in this invention, you may provide the release part. In this case, a still image is acquired and recorded in accordance with AND conditions of “shooting instruction from release unit” and “subject stationary condition”.
In this operation, a still image can be acquired and recorded at a timing that matches the instructed photo opportunity and has less blur.

(3)
Further, in the present invention, a means for the user to select the variable speed continuous shooting mode may be provided. In this variable speed continuous shooting mode, the still image continuous shooting speed is increased as the amount of motion detected from the moving image decreases. As a result, it is possible to shoot a lot of still images during a period of less blur. Also, the closer to a good shooting state with less blur, the higher the continuous shooting tempo. Therefore, according to the present invention, the user can be naturally guided to a shooting state with less blur as the continuous shooting tempo is increased.
On the other hand, the continuous shooting speed becomes slower as the blurring state increases. As a result, it is possible to reduce the number of frames of failed photos with many blurs and save the capacity of the recording medium.

(4)
Furthermore, the maximum motion amount may be detected from a plurality of locations in the screen, and the subject stationary condition may be determined based on the maximum motion amount. In this case, the fact that the maximum amount of motion satisfies the subject stationary condition means that the amount of motion is smaller than that in any other part of the screen. Therefore, it is possible to record a clear still image with less camera shake and subject blur at all of a plurality of locations on the screen.
Such an operation is suitable for photographing that requires clearness over the entire screen, such as a landscape photograph or a group photograph.

(5)
Alternatively, the minimum motion amount may be detected from a plurality of locations on the screen, and the subject stationary condition may be determined based on the minimum motion amount. In this case, even if the amount of motion is large at some points in the screen, if the amount of motion falls within one of them, a still image is acquired and recorded.

For example, a shooting technique called “panning” is known in which the camera is panned in accordance with the amount of movement of a moving subject. In this panning, the background portion in the screen flows greatly by panning. On the other hand, as the panning catches up with the movement amount of the moving subject, the moving subject in the screen approaches a stationary state.
In conventional panning, it is difficult to accurately perform shutter release by accurately determining the moment when the moving subject is stationary in the screen, and the success probability of panning is generally low.

  However, by obtaining the “minimum amount of motion” from the screen as described above, it is possible to exclude the motion of the background portion and extract the motion of a moving subject that is approaching a stationary state in the screen. Become. Therefore, by determining the subject stationary condition based on the “minimum amount of motion”, it is possible to determine a suitable panning timing (timing that the moving subject is almost stationary in the screen). As a result, it becomes possible to take a good panning photograph with a high probability that the moving subject is almost stationary.

(6)
In the present invention, a subject instruction unit for instructing and inputting a specific subject may be provided. The motion detection unit continuously detects the movement of the specific subject while tracking the specific subject. In this case, a still image can be acquired and recorded at a timing when the movement of the specific subject satisfies the subject stationary condition.

  For example, when a small child is photographed only with room light, the child is less likely to stay still, and the room light is dark and the exposure time is long, so subject blur is very likely to occur. In such a shooting environment, it is necessary to take a picture without missing a stationary state while chasing an irregular movement of the child, and the success probability is generally low. However, in the above moving body tracking operation, it is possible to capture a specific subject (in this case, a child) while tracking the specific subject within the screen without missing the moment when the specific subject is stationary.

(7)
Furthermore, in the present invention, the position of the specific subject may be recorded in association with the still image. By such recording, it is possible to easily specify a specific subject in the screen after shooting.
For example, when image processing or printing processing is performed later, processing based on the position of the specific subject can be performed.

(8)
In the present invention, a still image may be trimmed or electronically zoomed and recorded so that the specific subject is included in the screen.
For example, such an operation makes it possible to capture a specific subject on the screen by performing wide-angle video shooting, while still capturing a specific subject as a still image by electronic zoom processing or the like. .
In other words, it is possible to solve at once the request for reliably capturing a specific subject with a wide action range on the screen and the originally conflicting request for capturing a large image of the specific subject.

<< First Embodiment >>
FIG. 1 is a block diagram illustrating an electronic camera 11 (including a video recording apparatus) according to the first embodiment.
In FIG. 1, a photographing lens 12 is attached to the electronic camera 11. In the image space of the photographic lens 12, the light receiving surface of the image sensor 13 is arranged. The operation of the image sensor 13 is controlled by the output pulse of the timing generator 22b.

An image generated by the image sensor 13 is temporarily stored in the buffer memory 17 via the A / D converter 15 and the signal processor 16.
The buffer memory 17 is connected to the bus 18. An image processing unit 19, a card interface 20, a microprocessor 22, a compression / decompression unit 23, and an image display unit 24 are connected to the bus 18.

Of these, the card interface 20 reads / writes data from / to the removable memory card 21.
In addition, a user operation signal is input to the microprocessor 22 from the switch group 22a. The switch group 22a includes a release button, a mode operation button, a multi selector button, a command dial, and the like.

  Further, the image display unit 24 displays an image on a monitor screen 25 provided on the back surface of the electronic camera 11 and displays a menu related to the operation of the camera.

[Correspondence with Invention]
Hereinafter, the correspondence between the invention and the first embodiment will be described. Note that the correspondence relationship here illustrates one interpretation for reference, and does not limit the present invention.
The moving image acquisition unit described in the claims corresponds to the microprocessor 22 that executes “a function of capturing a moving image using the image sensor 13 and storing a moving image in the buffer memory 17”.
The motion detection unit described in the claims corresponds to the microprocessor 22 that executes “a function of detecting a motion amount from a moving image”.
The still image recording unit described in the claims corresponds to the card interface 20 and the microprocessor 22 that execute “a function of acquiring and recording a still image from the image sensor 13 when the moving image satisfies the subject stationary condition”.
The release portion described in the claims corresponds to the release button of the switch group 22a.
The selection unit described in the claims corresponds to a mode operation button or the like of the switch group 22a.
The subject instruction unit described in the claims corresponds to a multi-selector button of the switch group 22a.
The imaging unit described in the claims corresponds to the imaging element 13 and the like.

[Operation of First Embodiment]
[basic action]
FIG. 2 is a flowchart of a basic operation for capturing a still image in the middle of moving image shooting. Hereinafter, the operation will be described along the step numbers.

Step S1: Prior to shooting, the user turns on the main power of the electronic camera 11 and sets the mode selection dial of the electronic camera 11 to the shooting mode. In response to this operation, the microprocessor 22 gives a thinning readout drive pulse to the image sensor 13 via the timing generator 22b. As a result, a moving image (here, a low-resolution image obtained by thinning-out reading) is read from the image sensor 13 at a predetermined frame rate.

Step S2: The read moving image is temporarily stored in the buffer memory 17 after passing through the A / D conversion unit 15 and the signal processing unit 16. The image display unit 24 reads out the moving image from the buffer memory 17 and displays it on the monitor screen 25 (so-called through image display).

Step S3: The microprocessor 22 determines whether or not there is a moving image recording instruction from the user via the switch group 22a.
If there is an instruction to record a moving image, the microprocessor 22 proceeds to step S4. On the other hand, when there is no instruction to record a moving image, the microprocessor 22 shifts the operation to step S5.

Step S4: The microprocessor 22 performs a compression process on the moving image in the buffer memory 17 in accordance with a moving image recording instruction from the user. By this compression processing, frame data of a moving image file (Motion JPEG, MPEG, etc.) is generated and stored in the buffer memory 17. After this processing, the microprocessor 22 shifts its operation to step S5.
Note that the card interface 20 sequentially performs writing to the memory card 21 every time a predetermined amount of moving image data is generated.

Step S5: The microprocessor 22 determines whether or not the number of frames of the moving image in the buffer memory 17 is sufficient for the later-described motion detection and subject stationary condition determination.
If the number of frames of the moving image is insufficient immediately after the start of moving image shooting, the microprocessor 22 does not enter the motion detection operation and returns the operation to step S1.
On the other hand, when the number of frames of the moving image is sufficient for motion detection or the like, the microprocessor 22 shifts the operation to step S6.

Step S6: The microprocessor 22 refers to the operation setting (for example, custom setting) of the electronic camera 11, and determines whether or not the moving object tracking mode is selected.
Here, when the moving body tracking mode is selected, the microprocessor 22 shifts its operation to step S21 and subsequent steps in FIG.
On the other hand, if the moving object tracking mode is not selected, the microprocessor 22 shifts the operation to step S7.

Step S7: The microprocessor 22 obtains motion vectors for a plurality of predetermined locations on the screen. As a method for obtaining this motion vector, a block matching method or the like is known. It is also possible to obtain motions (scalar amounts) at a plurality of locations by taking pixel differences between frames and obtaining the sum of absolute values of the pixel differences for each of a plurality of regions.
Note that it is preferable that the user sets a frame interval when detecting the amount of movement according to the speed of movement, or automatically adjusts the amount of movement detected by the microprocessor 22.

Step S8: The microprocessor 22 refers to the operation setting of the electronic camera 11 and determines whether or not the panning mode is selected.
Here, when the panning mode is selected, the microprocessor 22 shifts the operation to step S10.
On the other hand, when the panning mode is not selected, the microprocessor 22 shifts the operation to step S9.

Step S9: When not in the panning mode, the microprocessor 22 compares the magnitudes of motion vectors at a plurality of locations in the screen and selects the maximum motion vector.
After this selection operation, the microprocessor 22 shifts the operation to step S11.

Step S10: In the case of the panning mode, the microprocessor 22 compares the magnitudes of motion vectors at a plurality of locations on the screen and selects the minimum motion vector.
After this selection operation, the microprocessor 22 shifts the operation to step S11.

Step S11: The microprocessor 22 refers to the operation setting of the electronic camera 11, and determines whether or not the variable speed continuous shooting mode is selected.
Here, when the transmission continuous shooting mode is selected, the microprocessor 22 shifts to the operation of the transmission continuous shooting mode shown in step S16 and subsequent steps in FIG.
On the other hand, if the variable speed continuous shooting mode is not selected, the microprocessor 22 shifts the operation to step S12.

Step S12: The microprocessor 22 determines the subject stationary condition using the following equation for the magnitude | M | of the motion vector selected in Step S9 or Step S10.
| M | <TH1 (Condition 1)
Here, the threshold value TH1 is a threshold value that is determined depending on how much image blurring is allowed, and is determined in advance based on an actual shooting experiment or the like. The threshold value TH1 is preferably changed according to the charge accumulation time of the still image of the electronic camera 11 (for example, in inverse proportion).
If the subject stationary condition is satisfied, the microprocessor 22 proceeds to step S13.
On the other hand, if the subject stationary condition is not satisfied, the microprocessor 22 returns the operation to step S1.

Step S13: The microprocessor 22 refers to the operation setting of the electronic camera 11 and determines whether or not the automatic shooting mode is selected.
In the case of the automatic shooting mode, the microprocessor 22 shifts the operation to step S15 in order to immediately take a still image.
On the other hand, if it is not the automatic shooting mode, the microprocessor 22 shifts the operation to step S14.

Step S14: The microprocessor 22 confirms whether or not the release button is fully pressed.
Here, when the release button is fully pressed, the microprocessor 22 shifts the operation to step S15 in order to perform still image shooting.
On the other hand, if the release button is not fully pressed, the microprocessor 22 returns to step S1 without taking a still image.
It should be noted that, instead of pressing the release button fully, by selecting an item corresponding to the release button full-press using the operation member of the switch group 22 in the menu displayed on the image display unit 24, the release button An operation similar to the full pressing may be performed.

Step S15: The microprocessor 22 gives a driving pulse to the image sensor 13 via the timing generator 22b, and reads out a still image (here, a high resolution image obtained by reading all pixels) from the image sensor 13.
When this still image reading operation is completed, the microprocessor 22 returns the operation to step S1.

The read still image is temporarily stored in the buffer memory 17 after passing through the A / D conversion unit 15 and the signal processing unit 16. The still image is converted into a still image file through image processing by the image processing unit 19 and compression processing by the compression / decompression unit 23. The card interface 20 records this still image file on the memory card 21.
Such an operation (steps S1 to S15) makes it possible to capture a clear still image with less blur.

[Operation in variable speed continuous shooting mode]
FIG. 3 is a flowchart for explaining an applied operation (variable continuous shooting operation) for changing the continuous shooting speed of a still image between moving image shootings.
This operation is executed after branching from step S11 shown in FIG. Hereinafter, this operation will be described along the step numbers shown in FIG.

Step S16: The microprocessor 22 refers to the data table in which the graph shown in step S16 of FIG. 3 is tabulated based on the magnitude | M | of the motion vector selected in step S9 or step S10. A recording time interval T is determined.
Instead of using the data table, the time interval T for continuous recording may be determined by calculation from the magnitude | M | of the motion vector.

Here, the continuous shooting speed is increased by setting the time interval T of continuous shooting recording to be shorter as the magnitude | M | of the motion vector becomes smaller.
On the other hand, when the magnitude | M | of the motion vector becomes sufficiently small (for example, the threshold value TH1 or less described above), the microprocessor 22 sets the time interval T to “a value Tmin corresponding to the maximum speed continuous shooting of the electronic camera 11”. Secure to.

On the other hand, if the motion vector magnitude | M | is too large to be suitable for still image shooting, the microprocessor 22 sets the time interval T to an excessively large value to substantially perform the continuous shooting operation. Pause.
Note that the microprocessor 22 preferably increases or decreases the time interval T of continuous shooting recording according to the writing speed performance of the memory card 21 or the free space of the buffer memory 17.
For example, when the writing speed of the memory card 21 is slow, or when the free space in the buffer memory decreases, the microprocessor 22 increases the time interval T for continuous shooting recording.

Step S17: The microprocessor 22 determines whether or not the time interval T determined in step S16 has elapsed since the previous still image shooting.
If the time interval T has not yet elapsed, the microprocessor 22 returns the operation to step S1 without taking a still image.
On the other hand, when the time interval T has elapsed, the microprocessor 22 shifts the operation to step S18 in order to perform still image shooting.
Even in the case of the first frame of continuous shooting, the microprocessor 22 shifts the operation to step S18 in order to perform still image shooting.

Step S18: The microprocessor 22 refers to the operation setting of the electronic camera 11 and determines whether or not the automatic shooting mode is selected.
In the case of the automatic shooting mode, the microprocessor 22 shifts the operation to step S20 in order to immediately take a still image.
On the other hand, if it is not the automatic shooting mode, the microprocessor 22 shifts the operation to step S19.

Step S19: The microprocessor 22 confirms whether or not the release button is fully pressed.
Here, when the release button is fully pressed, the microprocessor 22 shifts the operation to step S20 in order to perform still image shooting.
On the other hand, if the release button is not fully pressed, the microprocessor 22 returns to step S1 without taking a still image.
Note that the full pressing operation of the release button may be replaced by a menu operation as described above.

Step S20: The microprocessor 22 gives a drive pulse to the image sensor 13 via the timing generator 22b, and reads a still image from the image sensor 13.
When this still image reading operation is completed, the microprocessor 22 returns the operation to step S1.
The read still image is temporarily stored in the buffer memory 17 after passing through the A / D conversion unit 15 and the signal processing unit 16. The still image is converted into a still image file through image processing by the image processing unit 19 and compression processing by the compression / decompression unit 23. The card interface 20 records this still image file on the memory card 21.
With such an operation, still image shooting is repeated at the time interval T changed in step S16. As a result, it is possible to vary the continuous shooting speed of still images according to the blur situation.

[Motion tracking mode operation]
FIG. 4 is a flowchart for explaining an operation in the moving object tracking mode in which a specific subject in the screen is tracked by moving image shooting and a still image is captured at a moment when the specific subject is less blurred on the imaging screen.
This operation is executed after branching from step S6 shown in FIG. Hereinafter, this operation will be described along the step numbers shown in FIG.

Step S21: The microprocessor 22 confirms whether or not an instruction input for a specific subject has been newly made by the user via the switch group 22a.

The instruction input here preferably uses the following input device.
(1) A touch panel provided on the monitor screen 25.
(2) A GUI input unit with a multi-selector button and an indicator display on the monitor screen 25.
(3) A line-of-sight input device.
(4) A processing unit for selecting menu items such as “person” and “face” and detecting a picture selected from the menu from a moving image by color detection or pattern recognition.
(5) A processing unit that detects the half-press of the release button or the operation of the lock button and sets the selected area of the focus area at the time of detection as the position of the specific subject.
When receiving such an instruction input, the microprocessor 22 proceeds to step S22.
On the other hand, when there is no instruction input from the user, the microprocessor 22 shifts the operation to step S23.

Step S22: The microprocessor 22 stores the position on the imaging screen of the specific subject for which an instruction has been input. After this operation, the microprocessor 22 shifts the operation to step S26.

Step S23: The microprocessor 22 determines whether or not a specific subject to be tracked exists.
For example, when the specific subject is not set or the specific subject is out of the screen and lost sight, the specific subject does not exist. In this case, the microprocessor 22 shifts the operation to step S24.
On the other hand, if there is a specific subject to be tracked, the microprocessor 22 proceeds to step S26.

Step S24: The microprocessor 22 refers to the operation setting of the electronic camera 11, and determines whether or not the panning mode is selected.
Here, when the panning mode is selected, the microprocessor 22 shifts the operation to step S25.
On the other hand, when the panning mode is not selected, the microprocessor 22 interrupts the operation of the moving object tracking mode and returns the operation to step S1.

Step S25: In the panning mode, the microprocessor 22 detects an area with the smallest amount of motion from the moving image screen, and stores the area as the position of the specific subject.

Step S26: The microprocessor 22 obtains a motion vector between frames at the current position of the specific subject.

Step S27: The microprocessor 22 obtains a new position of the specific subject using the motion vector information obtained in Step S26 and the current position information of the specific subject.

Step S28: The microprocessor 22 refers to the operation setting of the electronic camera 11 and determines whether or not the variable speed continuous shooting mode is selected.
Here, when the transmission continuous shooting mode is selected, the microprocessor 22 shifts to the operation of the transmission continuous shooting mode shown in step S16 and subsequent steps in FIG.
On the other hand, if the variable speed continuous shooting mode is not selected, the microprocessor 22 proceeds to step S29.

Step S29: The microprocessor 22 determines the subject stationary condition for the magnitude | M | of the motion vector of the specific subject obtained in Step S26, as in Step S12 described above.
Here, when the subject stationary condition is satisfied, the microprocessor 22 proceeds to step S30.
On the other hand, if the subject stationary condition is not satisfied, the microprocessor 22 returns the operation to step S1.

Step S30: The microprocessor 22 refers to the operation setting of the electronic camera 11 and determines whether or not the automatic shooting mode is selected.
In the case of the automatic shooting mode, the microprocessor 22 shifts the operation to step S32 in order to immediately take a still image.
On the other hand, if it is not the automatic shooting mode, the microprocessor 22 shifts the operation to step S31.

Step S31: The microprocessor 22 confirms whether or not the release button is fully pressed.
Here, if the release button is fully pressed, the microprocessor 22 shifts the operation to step S32 in order to perform still image shooting.
On the other hand, if the release button is not fully pressed, the microprocessor 22 returns to step S1 without taking a still image.

Step S32: The microprocessor 22 gives a drive pulse to the image sensor 13 via the timing generator 22b, and reads a still image from the image sensor 13. The read still image is temporarily stored in the buffer memory 17 after passing through the A / D conversion unit 15 and the signal processing unit 16.
Note that the full-press operation of the release button may be substituted by the menu operation described above.

Step S33: The microprocessor 22 refers to the operation setting of the electronic camera 11 and determines the presence or absence of the trimming setting.
If the trimming setting exists, the microprocessor 22 shifts the operation to step S34 in order to perform the trimming process.
On the other hand, when the trimming setting does not exist, the microprocessor 22 does not perform the trimming process and shifts the operation to step S37.

Step S34: The microprocessor 22 sets a trimming frame in the still image screen based on the current position of the specific subject.

This trimming frame
(1) Vertical and horizontal pixel sizes (may be specified by a relative magnification with respect to the pixel size (size) of a specific subject)
(2) It can be set flexibly according to the position of the specific subject within the trimming frame.

Step S35: The microprocessor 22 trims the still image according to the trimming frame. In addition, it is good also as a structure which carries out an electronic zoom process to a trimming image by performing resolution conversion combined with trimming, for example, makes it the same pixel number as the pixel number of the image pick-up element 13.

Step S36: The position within the screen of the specific subject is changed by trimming. Therefore, the microprocessor 22 obtains the position of the specific subject for the still image after trimming.

Step S37: The still image is converted into a still image file through the image processing of the image processing unit 19 and the compression processing of the compression / decompression unit 23. The microprocessor 22 stores the position data of the specific subject in the still image file.
When the processing of such a still image is completed, the microprocessor 22 returns the operation to step S1.
On the other hand, the card interface 20 records the completed still image file in the buffer memory 17 on the memory card 21.
Next, another embodiment will be described.

<< Second Embodiment >>
FIG. 5 is a block diagram of the electronic camera 51 in the second embodiment.
The structural feature of the second embodiment is that imaging systems 52 and 53 for moving image shooting and signal processing systems 54 and 55 are separately provided. For example, in a single-lens reflex electronic camera, the imaging systems 52 and 53 can be provided in the viewfinder optical system.
In such a configuration, motion detection is performed using moving images output from the imaging systems 52 and 53, and a still image is captured using the image sensor 13 at the moment when the amount of motion satisfies the subject stationary condition.
Since other operations are the same as those in the first embodiment, description thereof will be omitted.

<< Additional items of embodiment >>
Note that, in the above-described embodiment, continuously shot still images are individually recorded (see step S20). However, a group of still images taken continuously may be recorded together as a moving image file. In this case, the operation of adjusting the frame rate of moving image shooting in accordance with the magnitude of movement | M | is realized by the processing in step S16.

  In the above-described embodiment, the threshold determination of the magnitude of movement | M | is the subject stationary condition. However, the present invention is not limited to this. The determination as to whether or not the magnitude of movement | M | is minimized may be used as the subject stationary condition.

  In the embodiment described above, “inter-frame motion detection” such as block matching is performed. However, the present invention is not limited to this. For example, the amount of motion in a frame is detected based on the amount of image blur detected in the frame of the moving image or the amount of compression code in the frame of the moving image (the amount of compression code increases when the image flow due to blur is small). “In-frame motion detection” may be performed for each frame of a moving image by detecting the size or the like.

  As described above, the present invention is a technique that can be used for a video recording apparatus or the like.

It is a block diagram showing electronic camera 11 of a 1st embodiment. It is a flowchart which shoots a still picture in the middle of movie shooting. It is a flowchart which carries out a variable speed continuous shooting of a still image between animation photography. 6 is a flowchart for capturing a still image at a moment when there is little blurring of the specific subject while tracking the specific subject on the screen in parallel with moving image shooting. It is a block diagram of the electronic camera 51 in 2nd Embodiment.

Explanation of symbols

11 Electronic Camera 12 Shooting Lens 13 Image Sensor 15 A / D Converter 16 Signal Processor 17 Buffer Memory 18 Bus 19 Image Processor 20 Card Interface 21 Memory Card 22 Microprocessor 22a Switch Group 22b Timing Generator 23 Compression / Expansion Unit 24 Image Display Part 25 Monitor screen

Claims (9)

  1. A video recording apparatus for recording an image acquired from an imaging unit,
    A moving image acquisition unit that acquires a moving image from the imaging unit;
    A motion detector for detecting a motion amount from the moving image;
    When the subject stationary condition that is one of “the amount of motion is smaller than a predetermined threshold” and “the amount of motion is minimal” is satisfied, a still image is acquired and recorded from the imaging unit. A video recording apparatus comprising: a still image recording unit.
  2. The video recording apparatus according to claim 1,
    A release unit that accepts shooting instructions
    The still image recording unit
    A video recording apparatus characterized in that when a shooting instruction is received from the release unit and the subject stationary condition is satisfied, a still image is acquired and recorded from the imaging unit.
  3. The video recording apparatus according to claim 1 or 2,
    Comprising a selection unit for variable speed continuous shooting mode in which the continuous shooting speed of the still image changes;
    The still image recording unit
    When the shift continuous shooting mode is selected,
    The video recording apparatus characterized in that the time interval of continuous shooting recording is shortened as the amount of movement decreases.
  4. The video recording apparatus according to any one of claims 1 to 3,
    The motion detector is
    A video recording device characterized by detecting the maximum amount of motion at a plurality of locations in a screen.
  5. The video recording apparatus according to any one of claims 1 to 3,
    The motion detector is
    A video recording apparatus characterized by detecting a minimum amount of motion at a plurality of locations on a screen.
  6. The video recording apparatus according to any one of claims 1 to 3,
    Provided with a subject instruction unit for inputting a specific subject.
    The motion detector is
    A video recording apparatus, wherein the movement of the specific subject is detected and tracked from the moving image, and the movement of the specific subject is continuously detected.
  7. The video recording apparatus according to claim 6,
    The still image recording unit
    A video recording apparatus, wherein the position of the specific subject is recorded in association with the still image.
  8. The video recording apparatus according to any one of claims 6 to 7,
    The still image recording unit
    The video recording apparatus, wherein the still image is recorded by trimming or electronic zoom so that the specific subject is included in a screen.
  9. The video recording apparatus according to any one of claims 1 to 8,
    An electronic camera comprising: an imaging unit that images a subject and outputs a moving image and a still image.
JP2004250191A 2004-08-30 2004-08-30 Video recording apparatus, and electronic camera Withdrawn JP2006067452A (en)

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JP2007181177A (en) * 2005-11-29 2007-07-12 Seiko Epson Corp Controller, photographing equipment, control method of photographing equipment, and control program
KR101345212B1 (en) * 2007-06-07 2013-12-26 삼성전자주식회사 A method of performing camera function in a portable terminal
US8040379B2 (en) 2007-11-22 2011-10-18 Casio Computer Co., Ltd. Imaging apparatus and recording medium
US8072497B2 (en) 2007-11-22 2011-12-06 Casio Computer Co., Ltd. Imaging apparatus and recording medium
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US8723976B2 (en) 2007-12-28 2014-05-13 Casio Computer Co., Ltd. Imaging device and storage medium
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US8373770B2 (en) 2008-02-20 2013-02-12 Nec Casio Mobile Communications, Ltd. Imaging device, imaging method, and program including automatically controlling an interval of continuous photographing
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US8780214B2 (en) 2010-05-10 2014-07-15 Panasonic Corporation Imaging apparatus using shorter and larger capturing intervals during continuous shooting function
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US9921643B2 (en) 2015-04-28 2018-03-20 Samsung Electronics Co., Ltd. Method and apparatus for extracting static pattern based on output of event-based sensor

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