JPH0659324A - Camera - Google Patents

Abstract

PURPOSE:To detect a correct camera shake signal in the midst of the exposure of a film even when the signal of a camera shake detection sensor is delayed. CONSTITUTION:When the jiggling quantity of a camera is detected by an angular velocity sensor 8, the delay of the signal outputted from the sensor 8 is detected by a CPU1 and the delay DELTAT of the signal is stored in an EEPROM12. Then, image blurring in the midst of the exposure on a film surface is calculated by the CPU1 based on the starting timing of the exposure and the delay DELTAT of the signal stored in the EEPROM12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera which calculates camera shake data during exposure on a film surface and restores a camera shake image based on the camera shake data.

[0002]

2. Description of the Related Art Conventionally, a technique has been proposed in which the amount of camera shake during exposure of a film is recorded in time series, the camera shake is notified to the photographer, and a blurred image is restored based on the recorded data. There is. An acceleration sensor, an angular velocity sensor, or the like is used as a sensor for calculating the camera shake data. On the other hand, in Japanese Patent Laid-Open No. 63-187883, for example, a physical quantity related to camera shake is detected and recorded in a recording medium. Techniques relating to "apparatus" are disclosed.

[0003]

However, in the above acceleration sensor or angular velocity sensor, if an attempt is made to improve the S / N of the signal, the delay of the signal due to the filter becomes large, so that a correct camera shake signal during film exposure is not obtained. Hard to get.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 63-187883, even if there is a delay in the camera shake detection sensor signal, since the delay is not taken into consideration, the correct camera shake signal during film exposure is detected. Can not do it.

The present invention has been made in view of the above problems, and an object of the present invention is to store the delay of the signal of the camera shake detection sensor in a non-volatile memory in advance.
Even if there is a signal delay in the camera shake detection sensor, the correct camera shake signal is detected during film exposure.

[0006]

In order to achieve the above object, a camera according to a first aspect of the present invention comprises a blur detecting means for detecting the blur amount of the camera during exposure on a film surface, and the blur. The delay detection means for detecting the delay of the signal detected by the detection means, the non-volatile storage means for storing the delay of the signal detected by the delay detection means, the exposure start timing and the non-volatile storage means. And a calculation unit that corrects and calculates an image blur during exposure on the film surface based on the stored signal delay. The camera according to the second aspect is further characterized by further comprising warning means for issuing a warning when the image blur during exposure on the film surface is equal to or more than a predetermined value. The camera according to the third aspect is further characterized by further comprising recording means for recording image blur during exposure on the film surface. The camera according to the fourth aspect is characterized in that the blurring amount is time series data of a position vector.

[0007]

In order to achieve the above object, in the camera according to the first aspect of the present invention, when the shake detecting means detects the shake amount of the camera during the exposure on the film surface, the delay detecting means causes the shake detecting means to detect the shake amount. The delay of the signal detected by the non-volatile memory means stores the delay of the signal detected by the delay detecting means. Then, the calculation means corrects and calculates the image blurring during the exposure on the film surface based on the timing of the start of the exposure and the delay of the signal stored in the nonvolatile storage means. In the camera according to the second aspect, the warning means gives a warning when the image blur during exposure on the film surface is a predetermined value or more. In the camera according to the third aspect,
Recording means records image blur during exposure to the film surface.
In the camera according to the fourth aspect, the blurring amount is based on time series data of a position vector.

[0008]

EXAMPLES First, prior to the description of the examples, FIGS.
The angular velocity sensor used as the camera shake sensor in the present invention will be described with reference to FIG. FIG. 7 is a diagram for explaining the angular velocity sensor.

In FIG. 1, the optical axis direction of the taking lens 102 mounted on the camera body 101 is the Z axis, the horizontal direction passing through the Z axis and orthogonal to the Z axis is the X axis, and the vertical direction passing through the Z axis is orthogonal. Is the Y axis. Further, the rotation angle components around each of the above axes are set as θz, θx, and θy, respectively.

The angular velocity sensors 1a and 1b used as means for detecting blur detect the rotation angles θx and θy, respectively. The rotation angle θx corresponds to the movement of the image on the YZ plane formed by the Y axis and the Z axis, and the rotation angle θy is
It corresponds to the movement of the image of the XZ plane formed by the X axis and the Z axis. FIG. 8 is a diagram showing a moving state of an image on the YZ plane when the camera body is shaken by the rotation angle θX.

As shown in FIG. 1, the first lens 102a and the second lens 102b, which are the taking lens 102, are 102
The image 103 of the subject is moved to the positions of a ′ and 102b ′.
Moves to the position of 103 'on the image plane C-D inclined by the angle θx.

Here, the first and second lenses 102a.
If the focal length of 102b is f, the distance from the focus to the subject is L, the distance from the focus to the image position is L ′, and the amount of movement of the image position is Δx, the amount of movement Δx of the image is It is shown by the following formula. Δx = (1 + β) ² .Theta.x.f ... (1) However, in the above formula (1), .beta. Is f / L, which is a photographing magnification.

The value f in the above equation (1) can be obtained as photographing lens information, and the value L giving β can be obtained from AF (autofocus) information from a distance measuring device (not shown). Further, since the value θx can be detected by the angle sensor 1a (see FIG. 1) as the blur detecting means, the movement amount Δx can be substantially obtained. Similarly, the movement amount Δy on the XZ plane when the camera body 101 is shaken by the rotation angle θy can be obtained from the following equation. Δy = (1 + β) ² .Theta.x.f (2) The angular velocity sensor employed as the shake detection sensor in the camera of the present invention has been described above. Next, a camera according to an embodiment of the present invention will be described. FIG. 1 is a diagram showing a configuration of a camera according to an embodiment of the present invention.

In FIG. 1, the CPU 1 includes a release switch 3, a shutter front curtain control magnet 4, a shutter rear curtain control magnet 5, a film SV, a shutter speed TV, and an aperture value AV. It is connected.

Then, the angular velocity sensor 8 for detecting camera shake
Are connected to a CR filter 9 for improving S / N, and the CR filter 9 and the photometric circuit 7 are connected to an analog input selection circuit 10. Further, the analog input selection circuit 10 is connected to the CP via the A / D conversion circuit 11.
It is connected to U1.

Further, the EEPROM 12 for holding the response delay ΔT of the signal of the angular velocity sensor 8 is connected to the CPU 1. Here, the input "W / R" of the EEPROM 12 is a line for controlling writing / reading, and "DATA" is a data input line for writing.

In addition to the above, the CPU 1 has a motor drive circuit 14 for controlling the drive of a motor 13 for winding and rewinding a film, and a display unit 15 for displaying exposure information such as film speed and shutter speed. A display unit 17 for a handshake warning and a magnetic recording circuit 2 for writing handshake data on a magnetic tape 16 attached to a film 19 by a magnetic head 18 are respectively connected. FIG. 2 is a diagram showing a state of the magnetic tape stuck on the film, and in the case of the present embodiment, the magnetic tape 20 is stuck on the upper part of the photographed image area.

Next, with reference to FIG. 3, a method of storing and holding the response delay ΔT of the signal of the angular velocity sensor 8 for detecting camera shake in the EEPROM 12 in the manufacturing process of the camera of the embodiment will be described. As shown in the figure, first,
When the CPU 21 applies a pulse as shown in FIG. 4A to the vibrator 23, the vibrator 22 vibrates as shown in FIG. 4B. On the other hand, the output end of the filter connected to the output end of the angular velocity sensor 8 of FIG. 3 is connected to the A / D converter 23, and the data thereof is sent to the CPU 21.

At the same time when the pulse is applied to the vibrator 22, the output of the A / D converter 23 is read by the CPU 21,
Delayed by ΔT from the pulse application of the shaker 22,
A pulse as shown in FIG. 4C is detected. Then C
The PU 21 sets the write / read signal line “W / R” of the EEPROM 12 to a high level to set the ΔT to the EEP.
Write to RROM12.

As described above, the camera shake detection angular velocity sensor 8 is provided.
This means that the writing of the delay of the response of the signal of (4) to the EEPROM 12 is completed. The above method is a good method for absorbing the variation in the delay of the signal of each camera, but when the delay ΔT is stable, the average ΔT is stored in the normal ROM. You can write it.

Hereinafter, with reference to the flowchart of FIG.
The operation of the camera of the embodiment will be described in detail. Here, operations such as hand-shake warning and writing of hand-shake data to a magnetic film at the time of shooting will be described.

When the release switch 3 (SW1) is pressed, photometry is started. That is, the output of the photometric circuit 7 is selected by the selection circuit 10, and the brightness BV of the subject is A / D converted by the A / D converter 11. Next, BV + SV =
The shutter speed TV is calculated based on the relationship of TV + AV, the TV is stored in the timer for measuring the exposure time, and the timer starts the time measurement at the same time when the next exposure is started (steps S100 to 102). Next, the shutter front curtain control magnet mg1 is energized to start the front curtain travel. This starts film exposure (step S103). Then, the response delay ΔT of the angular velocity sensor 8 held in the EEPROM 12 is stored in the timer TIM built in the CPU 1 (step S104).

Next, the content of the timer (TIM) is decremented until the content of the timer TIM becomes "0".
When this timer TIM becomes “0”, it means that the time ΔT has elapsed from the start of exposure (step S10).
5).

Next, the angular velocity sensor 8 is selected by the selection circuit 10.
Is selected (step S106), the outputs wx (i) and wy (i) of the angular velocity sensor (the angular velocity around the X axis is wx (i) and the angular velocity around the Y axis is wy (i).
i represents the order of the time series data) is A / D converted (step S107). Then, this wx (i), wy
(I) is stored in the memories Mwx (i) and Mwy (i), respectively (step S108). The above operation is performed until the end of exposure (steps S109 and 110).

The end of exposure is judged by detecting that the value of the above-mentioned exposure time measuring timer has become "0".
When the exposure end is detected, the shutter rear curtain control magnet mg2 is energized, and the shutter rear curtain travels (step S111).

Next, the memories Mwx (i), Mwy
The angles about the x and y axes are calculated by obtaining the sum of the angular velocity data stored in (i) by the following equations (3) and (4) (step S112).

[0027]

[Equation 1]

Then, from the above equations (1) and (2), X
The shake amount Δx (k) in the direction and the shake amount Δy (k) in the Y direction are calculated. Here, k is 1 to N (N is synergistic with the final data of the angular velocity), and Δx (k) and Δy (k)
(K = 1 to N) is time series data of the position vector of the amount of camera shake (step S113).

When the calculation of the camera shake amounts Δx and Δy is completed in this manner, the position vectors Δx (k) and Δy (k) (k =
1 to N) are recorded on the magnetic tape 16 attached on the film 19 via the magnetic head 18. By using this data, it is possible to restore a blur-free photograph from a blur photograph by the image processing in the lab (step S1).
14-117).

Next, Δx (k), Δy (k) (k = 1 to
N) is calculated (step S118), and when each value is larger than ε, the display unit 17 displays a camera shake warning (steps S119 and S120). In this way, all the operations are completed (step S121).
In addition, ε is a constant and is set to 30 μm in this embodiment.

Next, FIG. 5 is a diagram showing the timing of the release, exposure, and output of the angular velocity sensor. In the figure,
t1 is the release start, t2 is the exposure time, t3 is the exposure end, and t4 to t5 are the sections of the angular velocity data during the exposure.

As described in detail above, in the camera of the present invention, the signal of the camera shake detection sensor may have a delay, so that the filter constant for noise removal of the sensor output may be increased, so that the signal S / N can be improved. Further, even with a low-priced sensor having a poor S / N, a relatively high S / N can be obtained by increasing the filter constant. Furthermore, even a low-priced sensor with poor performance can be expected to improve performance by reducing noise with a filter.

[0033]

According to the present invention, the delay of the signal of the camera shake detection sensor is stored in the non-volatile memory in advance, so that the correct camera shake signal can be obtained during film exposure even if the signal of the camera shake detection sensor is delayed. It is possible to provide a camera capable of detecting

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a camera according to an embodiment of the present invention.

FIG. 2 is a diagram showing a magnetic tape attached on a film.

FIG. 3 shows the EEPROM 1 in a camera manufacturing process.
2 is the response delay Δ of the signal from the angular velocity sensor 8 for detecting the camera shake
It is explanatory drawing about the process of storing and holding T.

4A shows a pulse applied to the vibrator 22, FIG. 4B shows vibration of the vibrator 22, and FIG. 4C shows an output of the angular velocity sensor 8.

FIG. 5 is a timing chart showing the timing of release, exposure, and output of the angular velocity sensor 8.

FIG. 6 is a flowchart for explaining an operation of the camera of the embodiment.

FIG. 7 is a diagram for explaining an angular velocity sensor 8 as a camera shake detection sensor.

FIG. 8 is a diagram showing a moving state of an image on a YZ plane when the camera body is shaken by a rotation angle θX.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... Magnetic recording circuit, 3 ... Release switch, 4 ... Shutter front curtain control magnet, 5 ... Shutter rear curtain control magnet, 6 ... Information input part, 7 ... Photometric circuit, 8 ... Angular velocity sensor, 9 ... CR filter, 10 ... Analog input selection circuit, 11 ... A / D conversion circuit, 12 ... EE
PROM, 13 ... Motor, 14 ... Motor drive circuit, 15
... Display unit, 16 ... Magnetic tape, 17 ... Display unit, 18 ... Magnetic head, 19 ... Film.

Claims (4)

[Claims] 1. A shake detecting means for detecting a shake amount of a camera during exposure on a film surface, a delay detecting means for detecting a delay of a signal detected by the shake detecting means, and a delay detecting means for detecting the delay. A non-volatile storage means for storing the delay of the above-mentioned signal, and a correction calculation of the image blur during exposure on the film surface based on the timing of the exposure start and the delay time of the signal stored in the non-volatile storage means. And a computing means for performing the operation. 2. The camera according to claim 1, further comprising warning means for issuing a warning when the image blur during exposure on the film surface is equal to or more than a predetermined value. 3. The camera according to claim 1, further comprising recording means for recording image blur during exposure on the film surface. 4. The camera according to claim 1, wherein the blur amount is time series data of a position vector.