JPH0728147A - Camera with shake reduced - Google Patents

Abstract

PURPOSE:To provide a shake reduced camera with which the anticipation accuracy is enhanced by changing the data interval of the applied time series data depending upon the desired anticipation time. CONSTITUTION:A shake reduced camera concerned is composed of a shake signal sensing part 1 to sense the amount of eventual camera shake, a shake signal memory part 2 to store on the time series basis the shake signals sensed one by one, an anticipation time signal output part 3 emitting the information pertaining to the anticipation time as an anticipation time signal, a shake signal reading control part 4 to select and read from the part 2 past shake signal (s) necessary for anticipational computation in conformity to the given anticipation time signal, an anticipational computation part 5 which subjects the read shake signal string to a specified computational processing for converting into anticipation shake signal, and a shake reduction part 6 which performs a process to prevent or reduce the image degradation caused by a shake of the object photographed in response to the converted anticipation shake signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reducing image deterioration due to camera shake (camera shake) during shooting, and more particularly to a camera for predicting and detecting camera shake before camera shake exposure.

[0002]

2. Description of the Related Art Conventionally, various devices have been proposed for preventing deterioration of photographed images due to camera shake. For example, according to Japanese Patent Application No. 4-11225 proposed by the present applicant, camera shake is predicted from camera shake data in time series and a predetermined coefficient. Similarly, Japanese Patent Application No. 4-11 proposed by the present applicant
No. 373 proposes a method for predicting camera shake by multiplying time-series camera shake data by a predetermined coefficient and adding them.

[0003]

However, in the above-mentioned Japanese Patent Application No. 4-11225, in order to obtain a desired accuracy with respect to camera shake, a large number of sets of coefficients corresponding to the time to be predicted are desired. Must be stored, and a storage device for holding these is required. As a result, there is a problem that the hardware configuration becomes complicated and the cost becomes high.

Further, in Japanese Patent Application No. 4-11373, the time series data of the camera shake and the data interval time are set so as to sample the high frequency component of the camera shake. Therefore, when predicting a long time, The data used is too short to provide sufficient prediction accuracy.

Therefore, an object of the present invention is to provide a camera shake reduction camera which improves the prediction accuracy by changing the data interval time of time series data to be applied according to a desired prediction time.

[0006]

In order to achieve the above object, the present invention stores a plurality of camera shake signals by successively storing camera shake detection means for detecting a camera shake signal related to camera shake and the camera shake signal. Possible camera shake signal storage means, predicted time output means for outputting a time to be predicted in relation to the camera shake, and stored in the camera shake signal storage means based on the predicted time from the predicted time output means. Read control means for selectively reading the camera shake signal, prediction calculation means for predicting the camera shake signal after the predicted time based on the camera shake signal selectively read by the read control means, and the prediction calculation There is provided a camera shake reduction camera configured with a camera shake reduction unit that reduces image deterioration due to camera shake based on the output of the unit.

[0007]

[Operation] With the camera shake reduction camera configured as described above,
If data of a predicted time that is more suitable for a desired predicted time is selected from a plurality of camera shake signals (data) that are detected in advance and stored according to the predicted time, that is, if a long predicted time is to be set, In the case of data, a short prediction time, data for a short time is selected, changed to data of a prediction time suitable for a desired prediction calculation, and a shake prediction is performed.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, FIG. 1 shows a schematic structure of a camera shake reduction camera according to the present invention and will be described. This camera has a camera shake reducing function, and as its configuration, a camera shake signal detection unit 1 that detects the amount of camera shake and a camera shake signal that is sequentially detected by the camera shake signal detection unit 1 are stored in time series. Camera shake signal storage unit 2, predicted time signal output unit 3 that outputs information related to predicted time that is determined by shooting conditions as a predicted time signal, and predicted time signal output unit 3 described above.
The hand-shake signal read control unit 4 that selects and outputs at least two past hand-shake signals required for the prediction calculation based on the predicted time signal from the hand-shake signal storage unit 2, and the hand-shake signal read control unit. Prediction calculation unit 5 that performs a predetermined calculation process on the camera shake signal sequence from 4 to convert it into a predicted camera shake signal, and a camera shake of an image captured in response to the predicted camera shake signal from the prediction calculator 5 The image blur reduction unit 6 is configured to prevent or reduce image deterioration.

Next, FIG. 2 shows the structure of a camera shake reduction camera according to the first embodiment of the present invention, which will be described. Here, as an example of detecting a camera shake signal according to the present invention, a method proposed by the present applicant in Japanese Patent Application No. 5-64371 to detect a relative angular displacement between a photographer's face and a camera is adopted. , Detailed description is omitted.

In this camera, the camera shake signal detection unit 1
Is for measuring the amount of tilt between the face of the photographer and the rear surface of the camera (not shown) as shake, and the x-axis shake signal detection unit 11a for detecting the tilt in the vertical direction and the y-axis shake signal detection for detecting the tilt in the horizontal direction. And a part 11b.

The hand-shake signals sequentially detected by the hand-shake signal detection unit 1 are stored in the x-axis and y-axis hand-shake signal storage units 12a and 12b of the hand-shake signal storage unit 2 including the RAM 12 in time series. .

The predicted time signal output unit 4 uses the photometric device 14b for measuring the brightness of the subject and the exposure amount (shutter speed [exposure second], which is suitable for shooting) based on the measured brightness.
The exposure time / aperture value setting unit 14a in the CPU 19 for calculating the exposure aperture value) is provided, and the exposure time information is sent to the camera shake signal read control unit 3 as predicted time information.

The camera shake signal read control unit 3 selectively reads the x-axis and y-axis camera shake signals from the x-axis camera shake signal storage unit 12a and the y-axis camera shake signal storage unit 12b based on the predicted time information, and the prediction calculation unit. Enter in 5.

The prediction calculation section 5 comprises an x-axis shake signal prediction calculation section 15a and a y-axis shake signal prediction calculation section 15b, which are converted into an x-axis predicted shake signal and a y-axis predicted shake signal, respectively. The converted x-axis and y-axis predicted camera-shake signal is displayed on the screen plane by the predicted camera-shake signal synthesis unit 17.
It is converted into a value (combined shake signal) representing a magnitude corresponding to a dimensional shake. The combined shake signal is input to the exposure sequence control unit 16, and the operation of the exposure sequence is determined according to the pressed state of the release switch 20.

Further, the camera shake reducing section 6 is specifically
As disclosed in Japanese Patent Laid-Open No. 5-19327, the opening of a shutter for shooting is permitted or prohibited based on a signal indicating camera shake, and timing at which image quality is deteriorated due to camera shake It is an exposure sequence control unit 16 for avoiding exposure and enabling photographing.

The camera shake signal read control section 3, the prediction calculation section 5, the predicted camera shake signal composition section 17, and the exposure sequence control section 16 are configured as a program on a CPU 19 in the photographing apparatus.

Next, the camera-shake signal of the camera-shake reduction camera configured as described above will be described. The camera shake signal in this embodiment is angle information, which means the dimension of the position of the image when considering the camera shake. The amount of deterioration of the image quality due to the shake largely depends on the amount of movement of the subject image during exposure.

Therefore, in the case of the present embodiment, the difference between the detected camera shake signals at two time points indicates the magnitude of the shake. Therefore, when the exposure sequence control unit 16 evaluates camera shake, attention is paid to the difference between the two time points. The amount of shake generated during exposure can also be considered as the difference between the image position at the start of exposure and the image position at the end of exposure.

Further, in the case of an exposure time of about several tenths of a second, it can be considered that the difference between the image positions at the start point of exposure and the central point of exposure is approximately twice. Generally, in the case of prediction, the longer the prediction time is, the lower the accuracy of the signal is likely to be. Therefore, when considering the shake during exposure, the latter is often advantageous.

In the present embodiment, the exposure sequence controller 16 permits the exposure only when the predicted amount of camera shake at the central time point of the exposure is ½ or more of the allowable shake amount. .

Prediction will be described with reference to FIG. FIG. 3 shows the transition of the camera shake signal when the horizontal axis is time t with a solid line. With the current time t = 0, the camera shake signal is x ₀ , the signal in the past time Δt is x ₁ , the past 2 · Δt is x.
_Set to ₂ . If you extrapolated predicted trend and quadratic for the hand shake signal, as the estimated time t _y, representing the prediction value as x _y. t = 0 and t = t vibration amount of difference between two points in time of the signal _y d
Think as

[0022]

[Equation 1] Here, each coefficient a, b, c of the quadratic equation is x ₀ , x ₁ , x
About ₂ ,

[0023]

[Equation 2] It can be obtained by solving the simultaneous equations of.

[0024]

[Equation 3] Then, _xy is t _y / Δt = K, and

[0025]

[Equation 4] Can be expressed as

When the prediction time is changed, if t _y is changed, the coefficient of each term is changed, the quadratic equation for prediction is changed, and the characteristics of prediction are changed. Here, with respect to the equation (5), consider the calculation output _xy when a sin wave is applied to the input. For example, assuming that a prediction of 30 ms is performed, t _y
= 30 ms, Δt = 10 ms, input signal sin2πf ·
Assuming t (t; input frequency, t; time), and for simplification,

[0027]

[Equation 5] Then, the phase advances, that is, under the condition of prediction,

[0028]

[Equation 6] Becomes Here, C is the gain calculated by the equation (5), and φ is the phase difference corresponding to the prediction time. FIG. 4 shows this gain, and FIG. 5 shows a graph of the input frequency against the prediction time. The solid line is the characteristic of the operation obtained by the equation (5). As shown in Japanese Patent Application No. 4-11373, an example in which the values obtained by optimizing the coefficients α, β and γ in the equation (6) from the actual camera shake signal are calculated is shown by a dotted line. By the way, in the case of formula (5),

[0029]

[Equation 7] For optimization,

[0030]

[Equation 8] Is. From equations (7) and (7 ′), α + β + γ = 1
In the case of, the graph shows that the gain on the low frequency side at 1 Hz or less becomes 1, and the above α, β, and γ also have a total of 1.

By the way, as can be seen from the graph,
The calculation of the equation (5) does not have flat characteristics with respect to gain and prediction time with respect to frequency. However, since the frequency component of the camera shake signal is considered to have its main component at approximately 10 Hz or less, it is important that the characteristics of the prediction calculation be flat at 10 Hz or less, and it is disclosed in Japanese Patent Application No. 4-113373. There is a method advantage.

However, by setting this optimum coefficient,
A disadvantage of reading and performing prediction calculation according to the prediction time is that the coefficients are set in advance for each prediction time, and the storage device for storing them is increased in size and cost.

Therefore, Δt is changed in order to change the characteristics of prediction. When f = 1 Hz, in the case of the equation (9), Δt = 0.02S; A = 0.845, B = 0.148, φ = 0.173
, Prediction time = 27.5mS Δt = 0.01S; A = 0.877, B = 0.072, φ = 0.081
, Prediction time = 13.0 mS Δt = 0.005 S; A = 0.884, B = 0.035, φ = 0.040
, Prediction time = 6.4 mS. That is, in f · Δt << 1,

[0034]

[Equation 9] Therefore,

[0035]

[Equation 10] Since the prediction time is (φ / 2π) · 1 / f, the prediction time is proportional to Δt.

That is, by keeping the coefficient for prediction used in the equation (6) constant and changing the time interval Δt to the input hand shake signal, the prediction time changes proportionally. By the way, in this embodiment, since the shake is evaluated as in the expression (1), the expression (6) gives

[0037]

[Equation 11] Therefore, it is possible to simplify the calculation by storing α ′ as a prediction coefficient instead of α as α ′ = α−1 and using it in the prediction calculation. In this embodiment,
The basic Δt is 10 msec and yt is 30 msec. Let these reference values be Δt _o and y _to , respectively.

Next, the operation of each component of this embodiment will be described with reference to the flow chart shown in FIG. Here, the reference numerals of the respective members are the same as those in FIGS. 1 and 2.
First, after the program of the CPU 19 is started, the camera shake data storage number counter M is cleared (step S
1) Then, the photometric device 14b is operated to measure the subject brightness (step S2). Next, based on the measured subject brightness, the exposure time at the time of shooting and the aperture value are obtained by a known apex arithmetic expression (step S3). This calculation program is executed by the aperture value setting unit 14a at the exposure time.

Next, using the x-axis camera shake signal detector 11a and the y-axis camera shake signal detector 11b of the camera shake signal detector 1,
The occurrence state of camera shake is detected as a camera shake signal (step S4). These detected camera shake signals are
It is sequentially stored in the x-axis camera shake signal storage unit 12a and the y-axis camera shake signal storage unit 12b in the RAM 12 (step S).
5). Also, the camera shake data storage number counter M is incremented.

Next, it is determined whether or not the photographer has operated the release switch 20 for photographing, that is, whether or not the second-stage release switch has been turned on (step S6). If no operation is performed here (NO), the process returns to the photometry in step S2, and the photometry and the following steps are periodically repeated. However, if the release switch 20 is operated (YE
S), the exposure time previously obtained is read (step S7).

Next, time data to be predicted is set (step S8), and it is determined whether or not the prediction is possible with this value (step S9). This is also data for checking the accumulated amount of past data necessary for performing the prediction calculation. As described above, the shake at the central time point of the exposure time is predicted, but in the case of exposure in seconds, it is very difficult to predict the shake at the central time point of the exposure because of the long prediction time. In the present embodiment, the limit value of prediction having practical accuracy is 50 ms. That is, camera shake prevention operates up to an exposure of about 1/10 second. Therefore, 1/2 of the value set as the exposure time is compared with this limit value of 50 ms, and the smaller one is set as the predicted time y _t .

Y _t = (exposure second / 2) and smaller of (limit value) (11) Next, it is determined whether or not there is enough data accumulation that can be predicted. This is to correct the value of the hand-shake data storage number counter M indicating the circuit that has stored data to the storage time based on the storage interval time Δt _m , and to calculate the ratio of the predicted time y _t and the predicted time reference value y _to as the data interval. 2 of the image multiplied by the reference value Δt _o
It is determined whether or not the accumulation time is long by comparing with double. If this is expressed by an equation,

[0043]

[Equation 12] Will be investigated. here,

[0044]

[Equation 13] Then, the time interval Δt of the input data input to the prediction calculation is determined (step S10). If it is unpredictable due to insufficient data storage (NO), the process returns to photometry, and camera shake detection / storage is repeated.

Next, based on the input data time interval Δt, the camera shake signal used for prediction is stored in the camera shake signal storage unit 2 (R
It is read from the AM 12) (step S11). Ie x
The latest value, Δt past value, 2 · Δt for axis and y-axis
It is to read past values.

Next, a prediction calculation is performed (step S1).
2). The predicted camera shake signal on the x-axis is d _y , the latest camera shake data is x ₀ , Δt past data is x ₁ , 2 · Δt past data is x _2, and similarly for the y-axis, d _y , y
_{Let 0} , y ₁ , y ₂ . Further, the prediction coefficients used in the above equation (10) are α ′, β, γ. Then,

[0047]

[Equation 14] Becomes Thereby, the magnitude of the shake after the prediction time is obtained. Next, the shakes of the two axes are combined (step S1).
3). When considering the shake as a movement vector of the image on the image plane, the size d of its synthesis is

[0048]

[Equation 15] Is represented as

Next, the presence / absence of the shake is determined by comparing the obtained synthetic shake signal d with the information Th about the allowable limit value of the shake (step S14). Usually, a shake equal to the allowable scattering circle diameter can be tolerated, and the predicted combined camera shake signal d represents the amount of shake at the central point of exposure, which corresponds to Th = 1/30 mm.

When d> Th / 2 (16), it is determined that there is a shake. This Th may be set to a large value in accordance with the purpose of removing a large shake peculiar to a beginner.

As a result of the shake determination in step S14,
When it is determined that there is a shake (YES), the process returns to the above-described detection of the shake signal and repeats the following. However, as a result of the shake determination, when it is determined that "no shake" (NO),
The exposure unit 18 for exposing a known film at a predetermined shutter speed and aperture value is operated to expose the film (step S15). Then go back to the beginning of the program and try again:

Further, the above-described composition of the shakes about the two axes of the x-axis and the y-axis will be further described. In the above-described embodiment, considering the shake in a vector manner, the shake on the x-axis is d _x ,
deflection synthesis when the d _y runout y-axis,

[0053]

[Equation 16] Was expressed. However, in a small-scale device such as a camera, there is a case where it is difficult to carry out the calculation of the square root in consideration of the size of the program and the time required to execute the program. Therefore, the absolute values of d _x and d _y are set to | d _x | and | d _y |, and the equation (15) is modified.

[0054]

[Equation 17] Here, d = 0 when d _x = d _y = 0, and the above equation is when d ≠ 0. Now pay attention to the route.

[0055]

[Equation 18] , And partial differentiation with | d _x |

[0056]

[Formula 19]

| D _x | = | d _y |, in which case Z = 1/2. In FIG. 7, Z and | d _x |, | d
The relationship of _y | is shown. Also, considering the symmetry of Z with respect to | d _x | and | d _y |

[0058]

[Equation 20] Has the maximum error when | d _x | = | d _y |, but when x and y are orthogonal to each other in the vertical and horizontal directions,
| D _x | = | d _y | is the shake in the oblique direction.

By the way, many ordinary subjects have edge or line-shaped contrast in the vertical and horizontal directions. For this reason, when comparing photographs with the same amount of image blurring vertically, horizontally, and diagonally, the contrast of the diagonally blurred photograph is the largest, and therefore the impression of image quality deterioration when looking at the photograph is You will feel the strongest diagonal.

For example, when the shakes in the two axis directions are detected vertically and horizontally, and the two axes are combined and evaluated, when weighting by the shake directions is considered, d = | d _x | + | d _y | It can be said that the combination calculation by (21) is performed at the same time as the combination.

Further, the labor required for calculation is very simple as compared with the equation (15), and the system is not complicated. Therefore, it is also useful to use Equation (21) to find the magnitude of camera shake.

Further, in the case of considering the combination of the shakes of the two axes, in the above embodiment, the shake signals of the x and y axes are separately predicted and then combined. It is also possible to predict this after composition. In this case, the shake signal (x, y) on the x and y axes is detected, and the previous measurement value is (x ', y') and the measurement time interval (Δt _m ) from the shake velocity signal (v _x , v _y). ).

[0063]

[Equation 21]

Next, the combined shake signal (v) is obtained as v = | v _x | + | v _y | (23), and this combined shake signal v is stored in time series. The prediction calculation is performed by using V _y for the predicted shake signal and v for the latest shake signal.
₀ , the signal past Δt time is v ₁ , the signal past 2 · Δt time is v ₂ , and α, β, and γ are prediction coefficients, and V _y = α · v ₀ + β · v ₁ + γv ₂ (24) Is required as.

Since the predicted shake signal V _y is obtained from the combined value of the shake speeds as described above, it is dimensionally equivalent to the shake speed. Therefore, the exposure time S is multiplied in order to obtain the amount of shake during exposure. This product is compared with the allowable maximum shake limit (Th). That is, V _y
・ When S> Th, it is judged that there is a shake.

In the first embodiment, when it is determined whether or not the magnitude of the shake is within the allowable value, the allowable value is fixedly applied. The precision can be improved and the opportunity for release can be increased.

FIG. 8 shows an example of the temporal change of the shake signal d. The area marked with * that is less than or equal to the predetermined value Th is the range in which exposure is permitted. It is assumed that the photographer gives an instruction to start exposure at time t _A. The magnitude of the shake at that time is A. Allowable value Th
When compared with, the release operation is not performed because A> th. At time t _B , the shake signal d becomes equal to the allowable value, and exposure is started. In this way, the exposure is performed at a timing with a small shake, but it is assumed that the photographer gives an instruction to start the exposure at the timing of time t _C.

The shake in this case is C. Since C is below the allowable value, the exposure is performed immediately. However, at this timing, the shake tends to increase, and the shake during actual exposure may exceed the allowable value. In other words, the shake during the exposure is expected before the exposure, and this possibility remains. Further, at the timing t _B , the shake is in a decreasing direction, and it is considered that this possibility is low.

Next, an example will be shown in which the possibility that the shake becomes an unacceptable value during exposure is reduced at such a timing t _C. As shown in FIG. 9, the allowable limit Th _d
And a permissible limit value Th _u that is stricter than that. When the shake signal d is in the decreasing direction, the allowable value Th _d is compared with the magnitude of the shake signal d to determine the presence or absence of shake. In the section where the shake signal d is increasing (the section marked with a black circle in FIG. 9),
The presence or absence of shake is determined by comparing the strict tolerance limit th _u and d. As a result, the range in which the actual exposure is permitted becomes the range of the shake signal of the thick line in the figure, the exposure at the timing t _C is prohibited, and the range in which there is a possibility of shake can be accurately prohibited.

As a second embodiment according to the present invention, referring to the flow chart shown in FIG. 10, the shake speed is calculated by setting the camera tilt due to the shake of the two axes x and y as (x, y). Synthesize, store in time series, and use the stored data to predict the shake that will occur during exposure,
The operation of the camera for permitting / prohibiting the exposure by determining the presence / absence of shake at different allowable limits of shake according to the increasing / decreasing direction of the signal will be described.

First, the camera shake data storage number counter M indicating the number of combined camera shake signals stored in the camera shake signal storage section is cleared (step S21). Then, the subject brightness is measured using the photometric device 14b (step S2).
2).

Next, the exposure time / aperture value setting unit 14a is used to calculate the exposure time (S) and the aperture value to be used for proper exposure from the subject brightness (step S23). Further, each camera shake signal on the x and y axes is detected (step S2).
4).

The deflection angle of the x-axis is x, and the deflection angle of the y-axis is y.
Then, the shake velocity v _v , y _y is calculated by the equation (22) described above (step S25). Next, the previous shake detection value (x ′, which is used for the next shake speed calculation,
y ′) as x ′ = x, y ′ = y and rewritten with the latest camera shake detection value (step S
26).

Next, according to the equation (23), the shake velocity is combined to obtain a combined shake signal (step S27), and the obtained combined shake signal is stored in the shake signal storage unit 2 (step S28).

Next, the release switch 20 by the photographer
The presence or absence of the operation of is detected (step S29). That is, when there is no operation until the second-stage release switch is turned on (NO), the process returns to the photometry in step S22.
If there is a release operation (YES), the exposure time is read out (step S30), the time data to be predicted is set (step S31) as in the first embodiment, and it is then determined whether or not prediction is possible (step S31). Step S32). If the determination cannot be made (NO), the process returns to the photometry in step S22. If it can be predicted by this determination (YES), the address of the camera shake signal is set (step S33) and the past camera shake signal is read out (step S3), as in the first embodiment.
4). In the second embodiment, there is one type of combined camera shake velocity signal (v).

Next, a prediction calculation is performed from the read combined camera shake velocity signal and the prediction coefficient to obtain a predicted camera shake signal (step S35). Next, it is determined whether the predicted camera shake signal is in the increasing direction (step S36). If it is in the increasing direction in this determination (YES), the strict allowable limit value Th _u is substituted for the allowable limit value Th for determining the presence or absence of shake (step S37). However, if it is not in the increasing direction (NO), the normal allowable limit value th _d is substituted (step S38). Next, the allowable limit value Th and the product of the predicted camera shake signal exposure time (S) are compared to determine the presence or absence of shake (step S39).

If it is determined in this determination that there is a shake, the process returns to step S24 described above, and the shake signal (x,
If y) is detected and it is determined that there is no shake, the exposure unit 18 is used to expose the subject image on the film (step S
40) and then the process returns to step S21.

As described above, according to the camera shake reduction camera of the present embodiment, the past data having the time difference which is different depending on the photographing condition and corresponds to the desired predicted time is selectively taken out, and the prediction calculation is performed based on these data. It is possible to easily change to a desired prediction time.

In the embodiment of the present invention, the system for controlling the timing of the exposure start is used as the shake reducing section, but the present invention is not limited to this system, and
It is of course possible to apply a shake reduction method such as changing the exposure time and strobe conditions, and other various modifications and applications are possible without departing from the scope of the invention. In addition, an example in which a quadratic equation is used as the prediction calculation is shown.
It is easy to expand to higher-order equations higher than the following equations.

[0080]

As described in detail above, according to the present invention, it is possible to provide a camera shake reducing camera for improving the prediction accuracy by changing the data interval time of the time series data to be applied according to the desired prediction time. .

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a camera shake reduction camera according to the present invention.

FIG. 2 is a diagram showing a configuration of a camera shake reduction camera according to a first embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between time and a transition of a camera shake signal in the camera shake reduction camera of the first embodiment.

FIG. 4 is a diagram showing gain characteristics of prediction characteristics in the camera shake reduction camera of the first embodiment.

FIG. 5 is a diagram showing the characteristics of the input frequency with respect to the prediction time, among the prediction characteristics in the camera shake reducing camera of the first embodiment.

FIG. 6 is a flowchart for explaining the operation of each component of the first embodiment.

FIG. 7 shows Z and | in the camera shake reduction camera of the first embodiment.
d _x |, | a diagram showing the relationship | d _y.

FIG. 8 is a diagram showing an example of temporal transition of a shake signal d in the camera shake reduction camera of the first embodiment.

FIG. 9 is a diagram showing a relationship between a camera shake signal and an allowable limit Th _d and an allowable limit value Th _{u in} the camera shake reducing camera of the first embodiment.

FIG. 10 is a flowchart for explaining the operation of the camera shake reduction camera according to the second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shake signal detection unit, 2 ... Shake signal storage unit, 3 ... Prediction time signal output unit, 4 ... Shake signal read control unit, 5 ... Prediction calculation unit, 6 ... Shake reduction unit, 11a ... X-axis shake signal detection unit , 11b ... y-axis camera shake signal detection unit, 12a ... X-axis camera shake signal storage unit, 12b ... Y-axis camera shake signal storage unit, 14
a ... Exposure time / aperture value setting unit, 14b ... Photometric device, 15
a ... X-axis camera shake signal prediction calculation unit, 15b ... Y-axis camera shake signal prediction calculation unit, 16 ... Exposure sequence control unit, 17 ... Predicted camera shake signal synthesis unit, 18 ... Exposure unit, 19 ... CPU, 2
0 ... Release switch.

[Procedure amendment]

[Submission date] May 23, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

When the prediction time is changed, if t _y is changed, the coefficient of each term is changed, the quadratic equation for prediction is changed, and the characteristics of prediction are changed. Here, with respect to the equation (5), consider the calculation output _xy when a sin wave is applied to the input. For example, assuming that a prediction of 30 ms is performed, t _y
= 30 ms, Δt = 10 ms, input signal sin2πf ·
Assuming t ( f ; input frequency, t; time), and for simplicity,

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshiyuki Matsumoto 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Toshiro Kikuchi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. A camera shake detection means for detecting a camera shake signal related to camera shake, a camera shake signal storage means capable of sequentially and repeatedly storing the camera shake signal and storing a plurality of camera shake signals, and a prediction related to the camera shake. A predicted time output means for outputting the time to be read, and a read control means for selectively reading the camera shake signal stored in the camera shake signal storage means based on the predicted time from the predicted time output means, Prediction calculation means for predicting the shake signal after the prediction time based on the shake signal selectively read by the read control means, and reduction of image deterioration due to shake based on the output of the prediction calculation means A camera shake reduction camera comprising: a camera shake reduction means.