JP3513185B2 - Image stabilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention is suitable for use with cameras and the like.
The present invention relates to a suitable shake correction device. [0002] 2. Description of the Related Art Conventionally, a camera or the like has
In the field, automation in all aspects such as exposure setting, focus adjustment,
Multi-functionality has been achieved so that good shooting can be performed easily.
ing. However, the quality of a photographed image is actually
Often, camera shake is causing the
In the year, there is a kind of image stabilizing camera that corrects this camera shake.
It has been proposed and is attracting attention. FIG. 13 shows the configuration of a conventional shake correction photographing apparatus.
An example is shown. In FIG. 1, reference numeral 1 denotes, for example, a vibrating gyroscope or the like.
Is an angular velocity detector composed of angular velocity sensors
It is attached to the shake correction photographing device. 2 is angular velocity
Cut off the DC component of the speed signal output from the detector 1
DC cut that passes only the AC component, that is, the vibration component
Filter. This DC cut filter can be
Filter (hereinafter referred to as HPF)
) May be used. 3 is output from DC cut filter
Amplifier that amplifies the obtained angular velocity signal to an appropriate sensitivity.
You. Reference numeral 4 denotes an angular velocity signal output from the amplifier 3
A / D converter for converting to digital signal, 5 for A / D conversion
An integrator that integrates the output of the integrator 4 and outputs an angular displacement signal;
Is the integral signal of the angular velocity signal output from the integrator circuit 5.
That is, judgment of panning / tilting from the angular displacement signal
7 is a pan / tilt determination circuit for performing pan / tilt determination
Output of road is analog signal or pulse output such as PWM
And outputs the result. And A / D
Converter 4, integrator 5, pan / tilt determination circuit 6, D / A
The converter 7 is, for example, a microcomputer (hereinafter, a microcomputer).
COM1). 8 is a microcomputer
Based on the displacement signal output from the
9 is a driving circuit for driving the steps so as to suppress the shake.
Correction means, for example, displace the optical axis to offset the shake
Optical correction means or memory that stores images
Electronically shifts the reading position of the image to offset the shake
Electronic correction means is used. [0007] [Problems to be solved by the invention]
According to the shake correction photographing device described above, the following problems
There are points. That is, various frequencies are mixed.
In the conventional case, the conventional method
Since it cannot be corrected, for example,
Even if the minute can be corrected, the low-frequency shake cannot be corrected
The problem that appears and you can not feel the anti-vibration effect
is there. The present invention has been made in view of the above circumstances.
And vibrations of various frequencies are mixed.
Even if the image shake can be corrected properly
It is intended to provide a correction device. [0010] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In addition, the image blur correction device of the present invention is a
Vibration detecting means for detecting a vibration speed, from the vibration detecting means
Integrates the output vibration speed signal and converts it into a displacement signal
An integration circuit, based on a displacement signal output from the integration circuit;
Image blur correction means for correcting the motion of an image,
Frequency of relatively large amplitude based on the degree signal
First frequency detecting means, based on the displacement signal
Frequency detecting means for detecting a frequency having a very small amplitude
And detecting the first and second frequency detecting means.
Compensation of the image blur correction means by comparing the results
The characteristic has been changed. [0011] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Examples will be described in detail. << First Embodiment >> FIG.
FIG. 2 is a block diagram showing a configuration of a first embodiment of a shift correction photographing apparatus.
It is. In the same figure, the prior art shown in FIG.
The same reference numerals are given to the same components as
Description is omitted. Referring to FIG.
An angular velocity sensor such as a vibrating gyroscope attached to the device
Output from the angular velocity detecting means 1
DC cut filter that cuts off the DC component of the speed signal
(Or HPF) to amplify the angular velocity signal to a predetermined sensitivity
The amplifier 3, the drive circuit 8, and the image correction means 9 are described above.
Using the same configuration as the preceding example shown in FIG.
What is different in the present invention is the device
Inside of the microcomputer COM2 that performs overall control
Configuration. In this embodiment, the image correcting means 9 is used.
For example, there is a variable angle prism (VAP) described later.
Or shift the image on the memory to compensate for the blur.
A correct memory control scheme is used. Looking at the configuration in the microcomputer COM2, A /
The D converter 4 converts the angular velocity signal output from the amplifier 3 into a digital signal.
Signal, and the high-pass filter HPF10 is optional.
And the function of changing the characteristic in the band of
The signal of the predetermined frequency component extracted by PF10 is
Integration to obtain the angular displacement signal at that frequency component,
The phase and gain correction circuit 11 calculates the product output from the integration circuit 5.
Compensation of phase and gain of minute signal output, that is, angular displacement signal
The photographing state determination circuit 12 outputs an angular velocity signal and an angular displacement signal.
To determine the shooting state such as pan / tilt from the HPF 10
And the characteristics of the phase and gain correction circuit 11 according to the shooting conditions.
The frequency determination means 13 controls the frequency in the photographing state.
The D / A converter 7 determines the phase and the phase.
The output signal of the gain correction circuit 11 is an analog signal or P
The signal is converted into a pulse output such as WM and output. Reference numeral 12 denotes an output from the A / D converter 3.
From the angular velocity signal and the displacement signal output from the integration circuit 5
Perform panning, tilting and shooting state determination,
A pan / ch that changes the characteristics of the HPF according to the result of the separation
This is a default judgment circuit. The specific operation of the pan / tilt determination is as follows.
Of the angular velocity signal output from the A / D converter 4
And the angular displacement signal output from the integrating circuit 5 and inputting the angular velocity
Degree is constant, angular displacement signal that integrates angular velocity signal monotonically increases
Panning or tilting to indicate
In such a case, the low-frequency
Shift the cut-off frequency to a higher
Change the characteristics so that the shake compensation system does not respond to the number
Things. When panning / tilting is detected
In case, VAP is gradually moved to the center of the movement range.
To During this time, detection of angular velocity signal and angular displacement signal is not performed.
When panning / tilting is completed
Again, lower the cut-off frequency in the low frequency range and
An operation to extend the range is performed. Reference numeral 13 denotes the angular velocity output from the A / D converter 3
Vibration applied to the device is detected from the
Controls the characteristics of the transfer and gain correction circuit 11 according to the frequency
Frequency detecting means. Here, the control output from the microcomputer COM2 is used.
Drive circuit that actually corrects image shake according to control signals
8. The image correcting means 9 will be described with an example.
For example, those shown in FIGS. FIG. 4 shows a variable apex angle prism (hereinafter VAP:
Varriable angle prisum)
The voice coil is used for the drive system, and the angular displacement is encoded.
Detects the loader and feeds back to the drive system to control the drive amount
Control system that constitutes a closed loop
You. First, VAP will be described in detail.
As shown in FIG. 8, the variable apex angle prism 306
Transparent high bending between two transparent parallel plates 340a, 340b
An elastic body or an inert liquid 342 having a refractive index (refractive index n) is narrowed.
And fill the outer periphery with a resin film, etc.
Elastically sealed with the sealing material 341 of the transparent parallel plate 340
a, 340b are of a structure that can swing, and are transparent
By swinging the parallel plates 340a and 340b, the optical axis
Is displaced to correct the shake. FIG. 9 is a schematic view of the variable apex angle prism 306 of FIG.
One of the transparent parallel plates 340a is connected to the swing shaft 301 (311).
Of the incident light flux 344 when rotated by an angle σ around
FIG. 4 is a diagram showing an over-state, and as shown in FIG.
The light beam 344 incident along 3 is the same as the wedge prism.
Deflected by angle φ = (n-1) σ according to the same principle
Shoot. That is, the optical axis 343 is decentered (deflected) by the angle φ.
It is. Returning to the description of FIG. 4, the VAP described above
Reference numeral 306 designates axes 301 and 311 via a holding frame 307.
It is fixed to the lens barrel 302 so that it can rotate. 313 is a yoke, 315 is a magnet, 3
Reference numeral 12 denotes a coil, which is used to supply current to the coil 312.
Can change the apex angle of VAP around 311.
A chair-type actuator is configured. 31
Reference numeral 0 denotes a slit for detecting the displacement of the VAP.
1 and coaxially with the holding frame 307, ie, the VAP 306.
It turns and displaces its position. 308 is a slit 310
The light emitting diode 309 detects the position of the
sition Sensing Detector)
08 and the displacement of the slit 310 is detected.
And an encoder for detecting the angular displacement of the VAP apex angle
ing. The incident angle is changed by the VAP 306.
The obtained luminous flux is CC-converted by the photographing lens unit 303.
An image is formed on the imaging surface of the imaging device 304 such as D. Reference numeral 305 denotes a shaft 301 of the holding frame 307 and
Center of the other rotation axis orthogonal to the rotation axis consisting of 311
Is shown. Next, the basics of the control circuit for driving and controlling the VAP
The general configuration and operation will be explained using the block diagram of FIG.
I will tell. In the figure, 306 is a VAP and 322 is a VAP.
An amplifier 323 is a driver for driving the actuator.
-324 is a voice core for driving the VAP 306 described above.
The il actuator 326 detects the vertical angle displacement of VAP.
Output encoder 325 is a micro computer CO
The control signal 320 for shake correction output from M2 and the angle change
To add the output signal of the phase encoder 326 in reverse polarity.
It is an arithmetic unit and is output from the microcomputer COM2.
Control signal 320 for shake correction and angular displacement encoder 3
The control system operates so that the output signal of the control signal 26 becomes equal
Therefore, as a result, the control signal 320
VAP 306 is driven to match the output
From the indicated position of the microcomputer COM2
Is controlled by the VAP. FIG. 6 shows an example of another image correcting means.
Yes, the aforementioned VAP is replaced with a voice coil type actuator.
Instead of using a stepping motor.
It has been achieved. This is based on the rotation axis 301 as the center of rotation.
By the stepping motor 401 through the holding frame 307
Thus, the VAP is driven. Ie lens barrel
The support frame 403 attached to the
Stepping motor provided with a card screw 401a
Attach 401 and attach the support frame 403
Key that is movably guided in the optical axis direction by the
Gear 404 is always engaged with the lead screw 401a.
And the carrier 404 is fixed to the support frame 307.
With the connecting rod 407 and the rotating shaft 406
By rotating the step motor 401,
The rear 404 is moved in the direction of the optical axis, and
By rotating the holding frame about the rotation shafts 301 and 311, VA
P is driven. 402 is the reference position of VAP
This is a reset sensor for detecting the position. In addition, like this
VAP drive mechanism is also provided for the shaft 305.
However, description thereof is omitted. Then, the system shown in FIG.
The circuit configuration for this is as shown in the block diagram of FIG.
You. In FIG. 7, the microcomputer CO
The control signal 320 output from the M2
At 10, drive calculation is performed to convert to a VAP drive signal,
Output to driver IC 411. And dry
Drive stepping motor 401 by bar IC
Then, the apex angle of VAP is changed. FIG. 10 shows a third example of the image blur correcting means.
The image information is stored in the memory,
The clipping range of the image from is smaller than the stored image.
And set it to a direction that offsets the movement of the image.
By shifting the image cutout position from the memory
Correction, and enlargement processing of the clipped image signal
To correct the screen size before outputting.
FIG. 4 shows a memory control type image blur correction means.
You. This method uses an optical correction mechanism such as VAP
The feature is that the image stabilization can be performed electronically without any
There is. In the figure, 100 is a zoom lens, 1
Reference numeral 01 denotes an image sensor (CCD) that converts an optical image into an electric signal.
Image sensor), 102 is an A / D converter, and 103 is
Control signal (vibration signal) input from microcomputer COM2
110 to reduce the shake component in the image signal.
Next, predetermined image information is cut out from the field memory 106.
The image stabilization process that corrects image shake by shifting the
To the image read from the
Performs so-called electronic zoom by performing large processing, and
Image processing circuit constituting angle-of-view correction processing means for converting the angle of view
And is realized by a micro computer. Numeral 104 is read from the field memory.
Performs electronic zoom to correct the image to the normal angle of view
At this time, the image information of two or more adjacent pixels is
This is interpolation processing means for interpolating one pixel signal from the report.
For this interpolation method, known means may be used.
For example, to interpolate between pixels using the average value between adjacent pixels
do it. 105 is a D / A converter, 107 is a zoom
Encoder that detects the zoom magnification ratio of the lens 100
is there. Next, the operation will be described.
The optical image that has passed through 0 is converted into an electric signal by the image sensor 101.
And output as an imaging signal. That imaging signal
The signal is converted into a digital signal by the A / D converter 102 and
Note the image information for one field via the memory controller
Write to the file 106. Here, input from microcomputer COM2
Shake signal input and zoom information from encoder 107
Cuts the image signal from the field memory 106
The readout position, that is, the readout range and its readout position
decide. Next, read from the field memory 106.
Of the output image according to the cutout size
That is, to convert the angle of view to its original size,
The number of pixels to be output during the pixel output period is determined, and the pixel information
Interpolation processing is performed by the interpolation processing circuit 104 for pixels that do not exist.
U. This signal is converted by the D / A converter 105 into an analog signal.
Convert to a analog signal and output. As described above, image correction means for correcting shake
Has been described with respect to a specific example. Next, the microcomputer shown in FIG.
FIG. 2 is a flowchart showing the processing operation of the COM2.
This will be described below. In the figure, control is started.
And in step S201, the DC cut filter
2, DC component is removed via amplifier 3 and predetermined
Angular velocity signal from the angular velocity detecting means 1 amplified to the level of
Is converted into a digital signal by the A / D converter 4.
To the microcomputer COM2. Subsequently, in step S202, the angular velocity
Extracted from the angular velocity signal by the signal and HPF10
Angular variation obtained by integrating a predetermined high-frequency component by the integration circuit 5
Panning / tilting and shooting status by position signal
Make a judgment. In step S203, a response is made to the result of the determination.
In order to set the characteristics of the HPF 10 as described above,
Are prepared in advance in the microcomputer COM2.
Read from the table that does not. That is, HPF10 is
If it is configured with a digital filter, its coefficient is stored.
To read and set predetermined coefficients from the table
Thus, the characteristics of the HPF 10 can be freely varied.
You. These panning / tilting and shooting conditions
The corresponding coefficients have been empirically determined. In step S204, the characteristic setting
Calculate HPF10 by coefficient and set its characteristics
Then, in step S205, the signal output from the HPF 10
Is integrated by an integrating circuit 5 to obtain an angular displacement signal (vibration signal).
Number). In step S206, the frequency detecting means 1
3 converts the angular velocity signal output from the A / D converter 4 into
The center frequency of the shake is detected by calculation, and step S2 is performed.
In step 07, in the shake determined in step S206,
Correction coefficient of transfer and gain correction circuit 11 according to heart frequency
Is prepared in the microcomputer COM2 in advance, not shown.
Read from table. The phase and gain correction circuit 11 is a shake correction system.
To compensate for the deterioration of the shake correction characteristics due to the phase delay of
With a phase advance element, as described below, for example
This digital filter is composed of digital filters.
Read out this correction coefficient and correspond to the shake frequency
The phase and gain correction characteristics are set. In step S208, step S207
A correction operation is performed using the coefficient obtained in step S209.
Calculation result obtained in the above, that is, the corrected angular displacement
The signal is converted into an analog signal by the D / A converter 7,
Alternatively, the microcomputer COM2 is used as a pulse output of PWM or the like.
Output more. The HPF 10, the integrating circuit 5, the phase and
The gain correction circuit 11 uses a digital filter or the like.
Therefore, the sampling time must be relatively high
(For example, about 1 kHz), but panning / tilting
Judgment circuit 12 for judging the shooting and photographing state, frequency detection
The means 13 performs processing at a relatively slow cycle (for example, 100 Hz).
Is fine. That is, it can be changed according to the situation. The frequency detection using the angular velocity signal shown in FIG.
The output means 13 may be, for example, a threshold value near the center of the signal.
At the time of intersection with this center or at a certain time
Although it is possible to detect by the number of intersections, etc., in this method,
It depends on the stability of the DC signal. In other words, on hand
When shooting with
Reliable shake frequency detection becomes difficult. Therefore, the increase or decrease of the signal for each sampling is
Attention is paid to frequency detection. That is, increase / decrease of signal
One set is one shake and several sets are detected within a predetermined time.
Calculate the frequency with In this method, every second
Can be detected every 0.5 Hz in 2 seconds. Here, the frequency detecting means 1 in the present embodiment
FIG. 3 is a flowchart showing an example of the method 3 and the operation of FIG.
This will be described with reference to FIG. This processing is performed once every certain time.
It should be repeated at the rate of times. In step S301, the frequency detection time T
Reading (loading) is performed by the clock function in step S302.
Of the counter t, ie, the counting operation of the counter
Operation is started, and the frequency detection time T and time are set in step S303.
Compares with the counter t and counts the clock counter
It is determined whether or not the value t has reached a predetermined time T, and
If the counter t has reached T, go to step S319.
If not reached, the process moves to step S304. In step S304, the clock counter
"1" is added to the data. Therefore, this "1" count
The app executes the process shown in the flowchart of FIG. 3 once.
And the processing time when the In step S305, the angular velocity signal is increased.
Increase flag 1 to check if it has happened before
To load. This increase flag indicates that the increase
"H" is set when the
If not, "L" is set. In step S306, the angular velocity signal is increased.
Is determined by flag 1 whether or not the event has occurred up to the previous time
If flag 1 = “H”, an increase has occurred in the past.
And the process proceeds to step S307, where flag 1 =
If it is "L", it is determined that no increase
Proceed to step S312. In step S306, the angular velocity signal
If the increase has occurred up to the previous time, step S30
At 7, check if the decrease has occurred before
To load the decrease flag 2 for Decrease flag 2
If the decrease has occurred before, “H” is set.
If no decrease has occurred in the past, “L” is set.
Have been. In step S308, the decrease is
It is determined by using the flag 2 whether or not it is awake, and the flag 2 =
"H", ie, if the decrease has occurred in the past, step
To S309, flag 2 = “L”, that is, a decrease has occurred in the past
If not, the process moves to step S312. In step S309, the vibration (vibration)
Load a run-out counter N1 for counting the number
In step S310, “1” is added to the shake counter N1.
After the calculation, the process proceeds to step S311 and the increase flag is set.
1, the reduction flag 2 is reset, and the processing is terminated. On the other hand, the increase flag 1 is set in step S306.
If it is determined that it is not "H" and in step S308
If it is determined that the decrease flag 1 is not “H”,
If no increase or decrease has occurred in the past,
Move to S312 and one sampling before (previous processing)
Is loaded with the angular velocity data ω-1, and then in step S3
13 and the current angle detected by the angular velocity detecting means 1
The speed data ω is loaded. In step S314, one sample
Increase or decrease of angular velocity data during the
Load the threshold level a for the change judged to have occurred
You. With the threshold level a and the sampling time,
The value can be set according to the frequency and the amplitude. In step S315, one sampling period
The absolute value of the amount of change in angular velocity data within the interval
And if not, step S32
4 and the process is terminated.
If the absolute value is equal to or greater than the threshold level a) Step S3
Proceed to step 16 and change in angular velocity during one sampling period
Is positive (increase) or negative (decrease)
If so, the process proceeds to step S317 to set the increase flag 1
Set to "H", if not positive (if decreasing)
The process proceeds to step S318, and the decrease flag 2 is set to “H”.
And then proceed to step S324 to execute the process.
finish. Incidentally, in step S303 described above,
Then, the count value of the clock counter t becomes the frequency detection time T.
If it has reached, the process proceeds to step S319, and
The load counter N1 is loaded, and the process proceeds to step S320.
Then, the number of shakes N1 is divided by the detection time T to obtain a unit time
The number of shakes (shake frequency F) for (one second) is obtained. Subsequently, in step S321, the number of times of shake is counted.
The clock N1 is cleared, and at step S322 the watch counter t
Is cleared, and in step S323, the vibration frequency F is set to a predetermined value.
Store in the storage area, and proceed to step S304
You. Subsequent operations are as described above. As described above, 1 of the increase / decrease of the angular velocity signal
By considering a group as one vibration, the low frequency range (for example,
(E.g., 1 Hz or less).
The effect of noise components can be reduced by setting the threshold level a.
Can be removed. Processing is performed using a microcomputer.
The advantage of this is that it can be easily realized.
is there. Here, the frequency determination means 1 in this embodiment
In 3, the shake frequency is detected and the frequency to be corrected is determined.
As a method for this, the swing compensation is based on the following idea.
The positive control characteristic is improved. Suitable for detecting high frequency, for example
Suitable for detecting the frequency and reduction from the current angular velocity signal.
Frequency components of the angular displacement signal
In the minute detection method, the anti-vibration characteristics
When the correction of
From the output of the signal can detect low-frequency frequencies even with relatively small amplitude
Detect the frequency by setting the detection level
A relatively low frequency is corrected based on the characteristics of the angular displacement signal. In such a case, correction for high frequency components
Should be corrected when the amplitude is large, and therefore the angular velocity
Frequency detection by the degree signal
And set it to detect
If a frequency is detected, it is corrected for the vibration of that frequency.
Should be performed. FIG. 11 is a flowchart showing the above contents. In step S401, an angular velocity detection signal is read.
Only, in S402, as described above,
Set the threshold level in descending order to obtain a relatively large amplitude.
Is set to detect the frequency of
Read the known frequency (AHz).In addition, as mentioned above
These threshold levels, described below or
Determined or set by the amplitude determination means 14 shown in FIG.
Things. In step S404, the angular displacement signal is read.
In step S405, increase / decrease threshold of frequency detection
Set the bell to a small value to detect even relatively small amplitude frequencies.
And the frequency detected in S406.
(B Hz). In S407, each detected cycle is
The wave numbers are compared, and the frequency (A H) obtained from the angular velocity signal is obtained.
If z) is a higher frequency, the correction cycle is performed in S408.
The wave number is assumed to be large amplitude and high frequency A Hz, and the frequencies are compared.
If the result is the same frequency, the
Number (here, B Hz) is the correction frequency, and the frequency is
If the result of the comparison is that the angular displacement signal has a higher frequency, S
At 410, the correction frequency is set to a relatively large amplitude
Control is performed with a relatively small amplitude and low frequency B Hz.
U. << Second Embodiment >> FIG. 12 shows a second embodiment of the present invention.
9 shows a second embodiment of the shake correction photographing apparatus. This embodiment is similar to the first embodiment.
The intended content of the invention is the same as that of the
Are shown, and are the same as those in FIG.
The parts are denoted by the same reference numerals, and description thereof is omitted. The difference from the first embodiment in FIG. 1 is that
Means for changing characteristics for phase correction and gain correction (that
Resistance value and variable gain amplifier for setting HPF time constant
To change the gain setting resistance).
Using the log switches 28 and 27,
A resistor R10 provided at the output of the amplifier 3 and an output of the integrator 5
Into the feedback loop of the OP amplifier 26
The duty ratio for turning ON / OFF the input resistor R9 is P
By performing PWM control by the WM generation circuit 29,
Controls the amount of current flowing in the circuit, effectively varying the resistance
It is configured to obtain the same function as that described above. Therefore, the system itself is similar to that of the first embodiment shown in FIG.
When the frequency is determined, the analog switch 2
8 to change the phase characteristics,
The gain of the variable gain amplifier can be varied by operating the switch 27.
Thus, shake correction control is performed. [0076] As described above, according to the present invention,
In the case where vibrations of various frequencies are mixed,
Image stabilization that can perform proper image stabilization
An apparatus can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of a shake correction photographing apparatus according to the present invention. FIG. 2 is a flowchart for explaining the operation of the first embodiment of the shake correction photographing apparatus according to the present invention. FIG. 3 is a flowchart for explaining a control operation of a frequency detection unit in the shake correction photographing apparatus according to the present invention. FIG. 4 is a diagram showing a configuration of a lens unit provided with an optical shake correcting means using a variable apex angle prism. FIG. 5 is a block diagram of a driving system of the variable apex angle prism. FIG. 6 is a diagram showing another example of a lens unit provided with an optical shake correcting means using a variable apex angle prism. FIG. 7 is a block diagram of a drive system for driving the optical shake correcting means shown in FIG. FIG. 8 is a diagram for explaining the configuration and operation of a variable apex angle prism. FIG. 9 is a diagram for explaining the configuration and operation of a variable apex angle prism. FIG. 10 is a block diagram illustrating a configuration of an electronic shake correction unit using image processing. FIG. 11 is a flowchart for explaining a shake correction operation of the shake correction photographing apparatus according to the present invention. FIG. 12 is a block diagram showing a second embodiment of the shake correction photographing apparatus according to the present invention. FIG. 13 is a block diagram illustrating an example of a shake correction photographing device before the present application.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/232

Claims (1)

(57) [Claims] [Claim 1] Detecting the shake vibration speed of an image reading device
Vibration detecting means, and vibration output from the vibration detecting means
An integration circuit for integrating a speed signal and converting it into a displacement signal,
Image motion based on displacement signal output from integration circuit
Image blur correction means for correcting the vibration based on the vibration speed signal
First frequency for detecting a relatively large amplitude frequency
Detecting means having a relatively small amplitude based on the displacement signal;
And second frequency detecting means for detecting a frequency.
Comparing the detection results of the first and second frequency detection means.
To change the correction characteristic of the image blur correction means.
And a shake correction device.