JPH09325376A - Shake detector for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform efficient control for taking a picture whose blur is extremely small. SOLUTION: A shake signal is outputted by detecting the shake condition of a camera by a shake detecting means 1. This shake signal is sampled by s sampling means 2 at a specified time interval, a shake judging means 3 judges an image blur condition on an image pickup surface from a camera shake condition, a photographic focal distance, an exposure time, etc., and the result is outputted to a shake reducing means 4. The means 4 controls the exposure operation of the camera, and decides the propriety of the exposure operation, and reduces the shake. A controlling means 5 controls the means 2 and changes the sampling period of the shake signal outputted by the means 1 based on the output of a camera operation condition judging means 6. A time measuring means 7 is connected to the means 5, and measures the time of the sampling period based on the information of the means 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shake detecting device, and more particularly, it is possible to perform efficient control by changing the sampling period when detecting camera shake, according to the operating state of the camera. The present invention relates to a camera shake detection device.

[0002]

2. Description of the Related Art Conventionally, an apparatus has been developed for reducing or correcting camera shake when taking a picture. For example, as an example of reducing blurring, Japanese Patent Application Laid-Open No. 3-92830 discloses the following technique. That is, the angular velocity of the camera shake is detected, and the shutter operation is started when the absolute value of the angular velocity is less than or equal to the predetermined value or when the absolute value of the angular velocity is less than or equal to the predetermined value and tends to decrease. In this way, the shutter is released when the amount of blurring is within the permissible value or when the blurring is converging, so exposure is performed at the timing when the blurring is small, and as a result, the image blurring of the photograph is reduced. Can be reduced.

Further, as an example of correcting the blur, Japanese Patent Laid-Open No.
Japanese Patent Laid-Open No. 107619 discloses the following technique. That is, a shake correction device that corrects a shake by repeating shake detection by a CCD and correction by driving a shake correction lens, and detects and corrects a shake of a camera based on input focal length information of a photographing lens. Change the sampling cycle when doing. In particular,
When the focal length of the taking lens is long, the sampling cycle is shortened, and when the focal length is short, the sampling cycle is lengthened.

This prevents the blur correction error from increasing in a lens having a long focal length, and the CCD in a lens having a short focal length.
It is possible to take a long integration time, and it is possible to detect and correct blur for a subject with lower brightness.

[0005]

However, Japanese Patent Application Laid-Open No.
In the example of Japanese Patent Laid-Open No. 92830, no consideration is given to the sampling cycle for blur detection. Therefore, for example, if the sampling is performed in a short cycle, the control becomes complicated and inefficient. Will be lower.

On the other hand, Japanese Unexamined Patent Publication No. 5-107619 discloses a device for varying the sampling period for blur detection. However, when the focal length of the photographing lens is long, the period is short even before the exposure operation. I am sampling at
Control is complicated and inefficient. The present invention has been made in view of the above problems, and detects camera shake with high accuracy,
Another object of the present invention is to provide a camera shake detection device that can be controlled by simple and efficient control.

[0007]

In order to solve the above problems, the present invention takes the following means. That is,
(1) Blur detection means for detecting a camera shake state, shake signal sampling means for sampling the output of the shake detection means at predetermined time intervals, and shake determination for judging the camera shake state from the output of the shake signal sampling means. Means, a blur reducing means for performing a blur reducing operation based on the output of the blur determining means, a camera operating state determining means for determining the operating state of the camera, and the blur signal receiving the output of the camera operating state determining means. A camera shake detection apparatus including: a control unit that controls the sampling unit;
(2) The control means shortens the sampling time interval of the blur signal sampling means from when the camera operation state determination means determines that the exposure operation preparation of the camera is completed to when the exposure operation start of the camera is determined. The camera shake detection according to (1) is characterized in that the first time is set, and at other times, the sampling time interval of the shake signal sampling means is set to a second time longer than the first time. Apparatus, (3) blur detection means for detecting the blur state of the camera, blur signal sampling means for sampling the output of the blur detection means at predetermined time intervals, and camera shake amount calculated from the output of the blur signal sampling means. A blur amount calculating means, a blur correcting means for performing a blur correcting operation based on an output of the blur amount calculating means, and an operating state of a camera are determined. A camera shake detection device including: a camera operation state determination means; and a control means for controlling the shake signal sampling means in response to an output of the camera operation state determination means, (4) the control means includes the camera From the determination of the exposure operation start of the camera by the operation state determination means to the end of the exposure operation of the camera, the blur detection and blur correction are repeated with the sampling time interval of the blur signal sampling means set to a short first time. ,
In other cases, the camera shake detection device according to (3) is characterized in that the sampling time interval of the shake signal sampling means is set to a second time longer than the first time.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing the concept of a camera shake detection device according to the present embodiment. FIG. 2 is a block diagram showing the blur detecting device more specifically. FIG. 3 is a main flowchart for explaining the operation of the blur detection device.
FIG. 4 is a flowchart illustrating the details of the subroutine “blurring determination 1” in FIG. FIG. 5 is a flowchart illustrating the details of the subroutine “blurring determination 2” in FIG.

In FIG. 1, a shake detecting means 1 is means for detecting a shake state of a camera, and is constituted by using, for example, one or two known vibration gyros. When the camera shake is detected, the camera shake detection means 1 outputs a camera shake signal corresponding to the camera shake amount. Then, the blur signal is sampled by the blur signal sampling means 2 at a predetermined time interval, that is, at a sampling cycle, and its output is sent to the blur determination means 3. This blur determination means 3
Then, the image blurring state on the current image pickup surface is judged from the current camera blurring state, the photographing focal length, the exposure time, and the like, and the information according to the level of the current image blurring state is obtained.
Output to Then, the blur reducing means 4 controls the exposure operation of the camera, determines whether or not the exposure operation is possible, and reduces blur.

The control means 5 is means for controlling the blur signal sampling means 2, and based on the output of the camera operating state judging means 6, the blur signal sampling means 2 is provided.
Is controlled to change the sampling period of the blur signal output by the blur detection unit 1. For example, from the time when the camera operation state judging means 6 judges that the camera is ready for the exposure operation until the start of the exposure operation of the camera is judged, the sampling time interval of the blur signal sampling means 2 is set to a short first time. At other times, the sampling time interval of the blur signal sampling means 2 is set to the second time longer than the first time.

The clocking means 7 is a means for clocking time, is connected to the control means 5, and carries out the clocking operation of the sampling period set by the control means 5. The blur signal sampling unit 2, the blur determination unit 3, the control unit 5, and the time counting unit 7 are central processing units (hereinafter, CP).
U). Next, a more specific configuration and operation will be described with reference to FIG. FIG.
The same components as those of the above are given the same reference numerals, and description thereof will be omitted.

The exposure control means 8 is means for controlling the exposure operation of the camera and determining whether or not the operation is possible, and receives the level information of the image blur state in the blur determination means 3. Further, a release operation means 9 is connected to the exposure control means 8. The release operation means 9 is for receiving the exposure start instruction from the photographer. Further, the exposure control means 8
The shutter device 1 used when actually performing the exposure
0 is connected. The shutter device 10 is composed of, for example, a quick return mirror of a single-lens reflex camera or a lens shutter device of a lens shutter camera.

The display means 11 of the camera displays the exposure mode information of the camera, the current image blur information level determined by the blur determination means 3, and the like. Next, the part that determines the timing of starting the exposure operation by the exposure control means 8 in FIG. 2 will be described. Before that, the camera shake is detected, and exposure is performed when the image shake state is small, so that the image shake occurs. Described below are camera shake reduction measures that reduce camera shake.

Generally, the release operation means 9 is operated by the photographer.
When is operated and there is an instruction to start exposure, the exposure operation is performed promptly. However, when the image blurring state at this time is large, it is preferable to wait until the timing when the blurring becomes small and perform the exposure operation because the image blurring is small in the finished photograph. Hereinafter, the determination / control of whether or not the exposure operation is started in this manner will be referred to as “release timing control”.

However, the timing at which the camera shake of the photographer becomes small is indefinite regardless of the exposure time and the focal length, and there are cases where the camera shake becomes small immediately (for example, after several tens of msec), or 1 second or more. In some cases, the blur does not decrease even after the elapse. Here, if the time until the blur becomes small is “exposure delay time”, this exposure delay time is
It will lead to a release time lag as it is.

Here, there is no problem if the release time lag may be large, but it may be possible to avoid the release time lag as much as possible. Such a shooting mode is, for example, a stop motion mode (exposure mode) for shooting a fast-moving subject with good timing,
A manual that wants to prioritize the aperture value, etc. in seconds set by the photographer
Shutter-priority / aperture-priority mode (exposure mode), continuous shooting mode where you want to shoot a large number of frames per second, and pre-flash of the flash for about a second or less to prevent red-eye from occurring when taking photos with flash light , A red-eye prevention mode (strobe light emission mode), which originally causes a release time lag, and the like.

Therefore, the camera according to the first embodiment of the present invention is a camera capable of release timing control, and the above-mentioned release time lag causes a problem or is an image to be avoided. In the case of the mode, the exposure operation is not started after the blurring state becomes small after the exposure start instruction, but the exposure operation is promptly performed when the exposure start instruction is issued.

On the other hand, in the case of a shooting mode in which even if a release time lag is generated to prevent blurring, it does not cause a problem in drawing, the exposure operation is started after the start of exposure is instructed, until the blurring state becomes small. To do so. Such shooting modes include, for example, a landscape that is generally stationary,
Landscape mode, portrait mode (exposure mode), one-shot mode (drive mode)
There are flash firing modes other than the red-eye prevention mode for preventing red-eye occurrence.

Next, the operation of the camera of the first embodiment will be described with reference to the flow charts of FIGS. FIG. 3 is a main flow chart for explaining the operation of the camera shake reduction device of the first embodiment.
In FIG. 3, in step S1 (hereinafter, steps are omitted), the camera is first initialized, that is, initialized.

Next, at S2, ESFLAG is set to "0".
To This ESFLAG is a flag indicating whether or not the exposure preparation is completed, and in the single-lens reflex camera,
It means whether or not mirror up or narrowing down is completed. In the case of a lens shutter, it means whether or not the lens drive for focusing the photographing lens is completed.

In S3, it is determined whether or not the 1st release signal (1R) of the camera is ON. 1R here
If is ON, the process proceeds to S4, and if not, S3 is repeated. In S4, the blur detection means for detecting camera blur is activated. It should be noted that if it has already been started, the shake detection means is operated as it is.

In S5, a photometric operation (AE) is performed by a photometric means (not shown). In step S6, a distance measuring / focus detecting operation (AF) is performed by a distance measuring means (not shown) or a focus detecting means. That is, in the case of a lens shutter camera, only distance measurement is performed, and in the case of a single-lens reflex camera, focus detection operation is further performed, and lens drive for focusing the photographing lens is performed.

In step S7, a "blur determination 1" subroutine is performed. This part will be described in detail with reference to FIG. In FIG. 4, in S30, the timer of the clock means 7 for counting the interval for sampling the blur signal is initialized, that is, initialized. In step S31, a flag indicating whether or not the exposure preparation is completed is ESFLAG.
Is "1", and if ESFLAG is "1", the process proceeds to S32, the set time (Tup) of the timer that defines the sampling period is set to a short time (T0), and ESFLAG is set. If is “0”, the process proceeds to S33, and Tup is longer than T0 (T1).
Set to. Here, T0 = 1 ms and T1 = 10 ms. Normally, ESFLAG is “0”, so Tup = 1
0 ms.

In S34, the timer of the clock means 7 is started. In S35, the output of the blur detection unit 1 activated in S4 is sampled and fetched. In S36, S35
The focal length is converted based on the output of the blur detection unit 1 sampled in 1. to perform the calculation for converting the camera blur information into the image blur information.

In S37, the display means 11 displays / announces the current blurring state based on the information calculated in S36. In S38, it is determined whether or not the timer has counted a predetermined value (Tup). If the predetermined value has been counted, the process proceeds to S39, and if not, S38 is repeated.

In S39, after clearing the timer, FIG.
The process returns to S8 in FIG. 3 through the flow shown in FIG. Returning to FIG. 3, in S8, the 2nd release signal (2R) of the camera
It is determined whether or not is ON. 2R is ON here
If so, the process proceeds to S9, and if not, the process returns to S3. Returning to S3, since the 1R judgment / AE / AF is followed by the blur judgment 1 subroutine, this loop is repeated unless 2R is pressed. This loop is considerably long in time. Becomes Therefore, 2R
The sampling cycle of the blur signal sampling means 2 becomes a long time until is pressed.

In S9, a lens drive for focusing the photographing lens in the case of a lens shutter camera, and a mirror-up operation and a focusing operation in the case of a single-lens reflex camera. Next, in S10, it is determined whether or not the exposure preparation is completed. Here, in the case of a single-lens reflex camera, it is judged whether or not the mirror up is completed,
In the case of a lens shutter camera, it is determined whether or not the lens drive is completed. If this exposure preparation is completed, the process proceeds to S11, and if not, S10 is repeated.

The fact that the single-lens reflex camera completes the mirror-up and moves to the next blur determination is because the camera-shake is large until the mirror-up is completed and an accurate camera shake cannot be measured. is there. S1
At 1, ESFLAG is set to "1". Next, in step S12, a "blur determination 2" subroutine for determining when to start the exposure operation is performed. This part will be described in detail with reference to FIG.

In FIG. 5, in S40, the timers used for blur determination are initialized, that is, cleared. Here, the timer 1 is a timer that defines the limiter time for blur detection, and the timer 2 is a timer that defines the sampling period. In S41, it is determined whether or not ESFLAG, which is a flag indicating whether or not the exposure preparation is completed, is "1". If ESFLAG is "1", the process proceeds to S42 and the set time of the timer 2 is set. (Tup)
Is set to a short time (T0), and when ESFLAG is "0", the process proceeds to S43, and Tup is set to a time (T1) longer than T0. Here, T0 = 1 ms, T1 = 1
0 ms.

In step S44, the timer 1 is started. S
At 45, the timer 2 is started. In S46, S4
The output of the blur detection unit 1 activated in step S1 is sampled and captured. In S47, focal length conversion is performed based on the output of the blur detection unit sampled in S46, and calculation for converting camera blur information into image blur information is performed.

In S48, it is judged from the blur information calculated in S47 whether or not the current blur condition is below a predetermined level. Here, the predetermined level refers to a degree that the amount of image movement on the image surface due to camera shake, that is, the amount of blur, falls within the permissible circle of confusion when the exposure operation is performed for a predetermined exposure time. If it is determined in step S48 that the current blurring state is below a predetermined level, it is determined that the camera shake does not affect the exposure operation, and ESF is determined in step S52.
After clearing LAG, this routine is exited and the process returns to S13 of the main flow shown in FIG. 3 to move to the exposure operation.

On the other hand, when it is determined that the level is not lower than the predetermined level, that is, when the shake is determined to be large, if exposure is started as it is, the influence of camera shake becomes a problem. Therefore, it is better not to perform the exposure operation until the shake state becomes equal to or lower than the predetermined level, and in this case, the process proceeds to step S49. In S49, it is determined whether the timer 1 has reached a predetermined value (for example, 200 ms as a limiter time). Here, if the predetermined value is not reached, S5
If it reaches a predetermined value, ESFLA is executed in S52.
After clearing G, the subroutine is exited, and the process returns to S13 of the main flow shown in FIG. 3 to move to the exposure operation. Here, when the timer 1 reaches the predetermined value, the reason why the flow of FIG. 5 is exited even though the blur is not below the predetermined level is that the exposure operation does not start forever even if 2R is pressed. Since the photographer feels uncomfortable,
This is to avoid this.

In S50, the timer 2 is set to a predetermined value (for example,
T0 = 1 ms) is determined. Here, when the timer 2 has not reached the predetermined value, S50 is repeated until it reaches the predetermined value. Here, the reason why S50 is repeated until the predetermined value is reached is to sample the output from the shake detection means 1 at regular intervals as described above. It should be noted that the reason why the sampling cycle is made constant is to perform accurate blur detection, and further shortening the sampling cycle enables more accurate blur detection. When the timer 2 reaches the predetermined value, the process proceeds to S51, the timer 2 is cleared and the process returns to the above-described S45, and the blurring state becomes the predetermined level or less, or the timer 1 has the predetermined value (limiter time). This loop will be repeated until.

Therefore, after the preparation for the exposure operation is completed,
The sampling cycle of the blur signal sampling means 2 is shorter than the sampling cycle until the preparation for the exposure operation is started until the blurring state falls below a predetermined level or the limiter time is reached. Next, returning to the description of FIG. 3 described above, exiting S12 described above means that the exposure operation should be started, and in S13, the exposure operation is started, that is, the shutter is opened. Specifically, the exposure control means 8 drives the shutter device 10.

Next, in step S14, it is determined whether or not a predetermined exposure time has elapsed. Here, if the time has not yet passed, step S14 is repeated, and if the time has passed, the process proceeds to step S15 to end the exposure operation. In a succeeding step S16, upon completion of the exposure operation in the step S15, in the case of a single-lens reflex camera, the mirror down operation and the aperture opening operation of a quick return mirror (not shown) are performed, and in the case of a lens shutter camera, the taking lens is moved. A lens drive is performed to return to the initial position. Then, after the film winding operation is performed in step S17, the process returns to step S3.

In this way, the blur detection sampling period is shortened only during the period from the completion of the exposure preparation to the start of the exposure, and the exposure operation is started when the image blur state becomes small. The picture will have very little blur. Until the exposure preparation is completed, the blur detection is simply for displaying the current blur state and notifying the photographer.Therefore, the sampling cycle is lengthened, and conversely, after the exposure preparation is completed, the exposure is Since the shake detection is for determining the timing to start the operation, the sampling cycle is shortened in order to accurately detect the shake. As a result, C
Efficient control can be performed without burdening the PU. (Second Embodiment) A second embodiment of the present invention will be described below with reference to FIGS.

FIG. 6 is a block diagram showing the concept of the camera shake detection device in this embodiment. Figure 7
FIG. 7 is a main flowchart explaining the operation of the blur detection device. FIG. 8 is a flowchart illustrating the details of the subroutine “blurring determination 3” in FIG. 7. FIG. 9 is a flow chart for explaining the details of the subroutine “blur determination / correction” in FIG. 7. In addition, this second
In the second embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 6, the camera shake signal detected by the camera shake detection means 1 is sampled by the camera shake signal sampling means 2 and sent to the camera shake amount calculation means 12, where the current camera shake state, photographing focal length, and exposure time. From the above, the current image blur state on the imaging surface is determined. as a result,
Information corresponding to the current level of the image blur state is sent to the blur correction unit 13. The blur correction unit 13 drives a part of a photographing lens (not shown) during exposure to correct the blur of the subject image.

As described above, the camera shake detection apparatus according to the second embodiment positively corrects the image shake on the basis of the output of the shake amount calculation means 12 to perform exposure. However, it is different from the device of the first embodiment, which only prohibits the exposure operation for a predetermined time when the camera shake is large due to the release timing control. Next, FIGS.
The operation of the camera of the second embodiment will be described with reference to the flowchart of FIG. FIG. 7 is a main flowchart illustrating the operation of the camera shake detection device according to the second embodiment.

In FIG. 7, first, in S101, the camera is initialized, that is, initialized. Then
In step S102, RFLAG is set to "0". This RFLAG is a flag indicating whether or not exposure is in progress. In S103, it is determined whether or not the 1st release signal (1R) of the camera is ON. 1R here
If is ON, the process proceeds to S104, and if not, S103 is repeated.

In S104, the blur detection means 1 for detecting camera blur is activated. It should be noted that if it has already been started, the shake detection means is operated as it is. S105
Then, the photometric operation (AE) is performed by the photometric means (not shown). In step S106, the distance measuring / focus detecting operation (AF) is performed by the distance measuring means (not shown) or the focus detecting means. In the case of a lens shutter camera, only distance measurement is performed, and in the case of a single-lens reflex camera, focus detection operation is further performed, and lens drive for focusing the photographing lens is performed.

In step S107, a "blur determination 3" subroutine is performed. This part will be described in detail with reference to FIG. In FIG. 8, in S130, a timer that counts the interval for sampling the blur signal is initialized, that is, initialized. In S131, it is determined whether or not RFLAG, which is a flag indicating whether or not the exposure operation is being performed, and if RFLAG is "1",
In step S132, the set time (Tup) of the timer is set to a short time (T0), and if RFLAG is "0", the process advances to step S133 to set Tup to a time longer than T0 (T0).
Set to 1). Here, T0 = 1ms, T1 = 10ms
And Normally, RFLAG is “0”, so Tup =
It is 10 ms.

In S134, the timer of the time measuring means 7 is started. In S135, the output of the blur detection unit 1 activated in S104 is sampled and fetched. In step S136, focal length conversion is performed based on the output of the blur detection unit 1 sampled in step S135, and calculation for converting camera blur information into image blur information is performed.

In S137, the current blurring state is displayed / announced based on the information calculated in S36. S138
Then, it is determined whether or not the timer counts a predetermined value (Tup). If the timer counts the predetermined value, the process proceeds to S139, and if not, S138 is repeated.

In S139, after clearing the timer, the flow shown in FIG. 8 is exited and the process returns to S108 in FIG. Returning to FIG. 7, in S108, it is determined whether or not the 2nd release signal of the camera, that is, 2R is ON. Here, if 2R is ON, the process proceeds to S109, and if it is not ON, the process returns to S103. In this way, until the 2R is turned on, shake detection is repeatedly performed at long sampling time intervals.

In S109, the lens drive or mirror up operation is started. Here, in the case of the lens shutter camera, the lens drive is performed, and in the case of the single-lens reflex camera, the mirror-up operation and the aperture operation are performed.
In S110, the exposure operation is started. In S111, R
Set FLAG to "1".

Next, in S112, a "blur determination / correction" subroutine is performed. This part is shown in FIG.
Will be described in detail. In FIG. 9, in S201, a timer that counts the interval at which the blur signal is sampled is initialized. In S202, it is determined whether RFLAG, which is a flag indicating whether or not the camera is performing exposure, is "1". If RFLAG is "1", the flow advances to S203 to set the timer set time ( Tup) is set to a short time T0 (1 ms), and if RFLAG is "0", the process proceeds to S204, and Tup is set to a time T1 (10 ms) longer than T0.

In S205, the timer of the clock means 7 is started. In S206, the output of the blur detection unit 1 activated in S104 is sampled and fetched. In S207, focal length conversion and the like are performed based on the output of the blur detection unit sampled in S206, and calculation for converting camera blur information into image blur information is performed.

In step S208, the shake of the subject image is corrected by a known means such as driving a part of a taking lens (not shown). In S209, it is determined whether or not the timer has counted a predetermined value (Tup). If the timer has counted the predetermined value, the process proceeds to S210, and if not, S209 is repeated.

In S210, the timer is cleared, the present subroutine is exited, and the process returns to FIG. Returning to FIG. 7, S113
Then, it is determined whether or not a predetermined exposure time has elapsed.
If the time has not yet passed, the process returns to S112 to perform blur detection and blur correction, and if the time has passed, the process proceeds to S114 to end the exposure operation. In this way, from the start of the exposure operation until the end of the exposure operation, shake detection and shake correction are repeatedly performed at intervals shorter than the sampling time interval before the start of the exposure operation.

In subsequent S115, RFLAG is cleared. In S116, in response to the end of the exposure operation in S114, in the case of a lens shutter camera, the initial position return (LD) of a focusing lens (not shown), and in the case of a single-lens reflex camera, a mirror down operation of a quick return mirror and an aperture (not shown) are performed. The opening operation is performed. Then, after the film winding operation is performed in step S117, the process returns to step S103.

As described above, since the sampling period is shortened during the exposure and the blur detection and the blur correction are repeated,
The finished photo becomes a blur-free photo. Further, since the sampling cycle for blur detection is lengthened during periods other than during exposure, efficient control can be performed without burdening the CPU. Further, since the release timing control is not performed, the extra time caused by the release time lag does not cause a problem.

The present invention, which is embodied by a plurality of modes as described above, can be variously modified within the scope not departing from the gist of the present invention. As described above, the present invention has been described based on the embodiments, but the present invention includes the following inventions. That is, (1) blur detecting means for detecting blur of the camera, blur signal sampling means for sampling the output of the blur detecting means at a predetermined time interval, and blur for judging the camera blur state from the output of the blur signal sampling means. The output of the camera operating state determining means; the camera operating state determining means for determining the operating state of the camera; and the output of the camera operating state determining means. A camera shake detection device for receiving the camera shake signal, and controlling the camera shake signal sampling means. (2) The control means shortens the sampling time interval of the blur signal sampling means from when the camera operation state determination means determines that the exposure operation preparation of the camera is completed to when the exposure operation start of the camera is determined. The camera shake according to (1) above is characterized in that the first time is set, and at other times, the sampling time interval of the shake signal sampling means is set to a second time longer than the first time. Detection device. (3) The camera shake detection according to (2), wherein the camera shake reduction / correction unit permits the exposure operation when the camera shake determination unit determines that the camera shake state is below a predetermined level. apparatus.

With such a structure, it is possible to easily take a photograph with a small image blur without using a complicated mechanism such as driving a part of the photographing lens to correct the blur. (4) The control means sets the sampling time interval of the shake signal sampling means to be short until the exposure operation start of the camera is determined by the camera operation state determination means until the exposure operation end of the camera is determined. The blur detection and the blur correction are repeated as the period of time, and at other times, the sampling time interval of the blur signal sampling means is set to the second time longer than the first time. The camera shake detection device described. (5) The blur reduction / correction unit is configured to drive a part of the photographing lens to correct the blur of the subject image when the blur determination unit determines that the camera blur state is equal to or higher than a predetermined level. The camera shake detection device according to (4) above.

According to this structure, since the release time lag does not occur, the camera does not feel uncomfortable for the photographer. (6) The blur determination means determines the image blur state on the imaging surface based on the output of the blur signal sampling means, the shooting focal length, and the exposure time. Camera shake detection device.

[0056]

As described above, according to the present invention, the time interval for detecting camera shake is changed according to the operating state of the camera, and, for example, the period for actually correcting the shake or the reduction operation is performed. Since the period is shortened, efficient control can be performed. And you can take pictures with very little blur.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a concept of a camera shake detection device according to a first embodiment.

FIG. 2 is a block configuration diagram more specifically showing a camera shake detection device according to the first embodiment.

FIG. 3 is a main flowchart illustrating an operation of the camera shake detection device according to the first embodiment.

FIG. 4 is a flowchart illustrating details of a subroutine “blurring determination 1”.

FIG. 5 is a flowchart illustrating details of a subroutine “blurring determination 2”.

FIG. 6 is a block configuration diagram showing the concept of a camera shake detection device according to a second embodiment.

FIG. 7 is a main flowchart illustrating the operation of the camera shake detection device according to the second embodiment.

FIG. 8 is a flowchart illustrating details of a subroutine “blurring determination 3”.

FIG. 9 is a flowchart illustrating details of a subroutine “blur determination / correction”.

[Explanation of symbols]

 1 shake detection means 2 shake signal sampling means 3 shake determination means 4 shake reduction means 5 control means 7 timing means 12 shake calculation means 13 shake correction means

Claims (4)

[Claims] 1. A blur detecting unit for detecting a blur of a camera, a blur signal sampling unit for sampling an output of the blur detecting unit at a predetermined time interval, and a blur for judging a camera blur state from an output of the blur signal sampling unit. Determining means, a blur reducing means for performing a blur reducing operation based on the output of the blur determining means, a camera operating state determining means for determining an operating state of a camera, and an output of the camera operating state determining means for receiving the blur. A camera shake detection device comprising: a control unit that controls a signal sampling unit. 2. The control unit controls the sampling time interval of the blur signal sampling unit from when the camera operation state determination unit determines that the camera exposure operation preparation is completed until when the camera exposure operation start is determined. Is set to a short first time, and at other times, the sampling time interval of the blur signal sampling means is set to a second time longer than the first time. Shake detection device. 3. A blur detecting means for detecting blur of a camera, a blur signal sampling means for sampling an output of the blur detecting means at a predetermined time interval, and a blur for calculating a camera blur amount from an output of the blur signal sampling means. Amount calculation means, shake correction means for performing a shake correction operation based on the output of the shake amount calculation means, camera operation state determination means for determining the operation state of the camera, and output from the camera operation state determination means A camera shake detection apparatus comprising: a control unit that controls the shake signal sampling unit. 4. The control means shortens the sampling time interval of the blur signal sampling means from when the camera operation state determination means determines that the exposure operation of the camera is started until when the exposure operation of the camera is determined. 4. The blur detection and the blur correction are repeated as the first time, and at other times, the sampling time interval of the blur signal sampling means is set to the second time longer than the first time. The camera shake detection device described in 1.