JP4760024B2 - Image blur correction device - Google Patents

Description

  The present invention relates to an image blur correction apparatus, and more particularly to an image blur correction apparatus that corrects (prevents) image blur due to vibration in a camera or the like.

  As an image shake correction device for a TV camera, an anti-vibration lens is placed in the photographic optical system so as to be movable within a plane perpendicular to the optical axis. When vibration is applied to the camera (camera photographic optical system), image shake caused by the vibration An image stabilization lens is driven by an actuator so as to cancel the image to correct image blur (see, for example, Patent Documents 1 and 2). In addition to the method of using an anti-vibration lens that moves in a plane orthogonal to the optical axis, a method of correcting image blur is known. The amount of correction for canceling image blur with respect to vibration applied to the camera (corresponding to the amount of displacement of the anti-vibration lens when using an anti-vibration lens) It is calculated based on a shake signal detected by the detection sensor and output from the shake detection sensor.

Conventionally, whether or not the camera is performing pan / tilt operation is automatically determined based on the shake signal obtained from the shake detection sensor. Proposals have been made to eliminate the unnaturalness of the screen and the poor operability for pan / tilt operations caused by performing image blur correction during pan / tilt operations by stopping correction or reducing the effectiveness of image blur correction. (For example, see Patent Document 3). The determination of whether or not the camera is performing pan / tilt operation (pan / tilt determination) is, for example, whether or not the magnitude of the shake signal from the shake detection sensor has continuously exceeded a predetermined threshold for a certain time or more. And so on.
JP 2001-142103 A JP 2003-107554 A JP 2002-229089 A

  By the way, the shake signal obtained from the shake detection sensor is used for calculation of a correction amount for canceling image shake and pan / tilt determination of whether the pan / tilt operation is being performed. It may be necessary to acquire the shake signal (correction amount calculation signal) and the shake signal for pan / tilt determination (pan / tilt determination signal) through different signal lines. For example, in calculating the correction amount, the output signal of the shake detection sensor may not be used as it is, but the output signal may be used after preprocessing such as DC cut (HPF) or LPF. In such a case, if the correction amount calculation signal subjected to such pre-processing is also used for pan / tilt determination, an appropriate determination is made based on the fact that a signal component necessary for pan / tilt determination has been removed. I can't. In such a case, the correction amount calculation signal and the pan / tilt determination signal are acquired through different signal lines, and necessary preprocessing is performed on the signal line for acquiring the correction amount calculation signal. ing.

  However, even when separate signal lines are provided as described above, pre-processing is performed because of variations in the characteristics of the pre-processing unit that performs pre-processing (variation in resistance value, capacitor capacity, etc.). The correction amount calculation signal also varies from product to product. The variation in the correction amount calculation signal also causes variation in the correction amount for each product, which affects the accuracy of image blur correction. However, if the variation in the correction amount calculation signal is standard, the influence on the accuracy of image blur correction is not a big problem.

  On the other hand, the variation in the correction amount calculation signal causes a variation in each product even in relation to the pan / tilt determination signal. This variation has a problem in that when the image blur correction is stopped (or the effect of the correction is reduced) when it is determined that the pan / tilt operation is performed, the behavior of the movement of the image on the shooting screen is significantly affected. was there. For example, if there is variation in the correction amount calculation signal for each product with respect to the pan / tilt determination signal, the amount of correction when the pan / tilt operation is determined after the pan / tilt operation is started ( Variations occur in the displacement amount of the image stabilizing lens) and the change rate of the correction amount (moving speed of the image stabilizing lens). The variation appears notably as a difference in the behavior of image movement on the shooting screen during pan / tilt operation. In particular, the larger the magnitude of the correction amount calculation signal relative to the magnitude of the pan / tilt determination signal, the more impression is given that the timing of image movement will be delayed with respect to the pan / tilt operation. This creates a sense of incongruity in the movement behavior of the image.

  The present invention has been made in view of such circumstances, and provides an image shake correction apparatus capable of preventing an uncomfortable feeling in the movement behavior of an image on a shooting screen during a pan / tilt operation. With the goal.

In order to achieve the above object, an image shake correction apparatus according to claim 1 is an imaging position on an imaging plane of an image formed by an optical system, or an image for recording or reproduction among the images. An image displacement means for displacing an image by effectively displacing an image pickup range, a shake detection means for detecting vibration applied to the optical system and outputting a shake signal corresponding to the detected vibration, and the shake a correction amount calculation signal obtaining means for obtaining the correction amount calculation signal for calculating the correction amount with respect to vibration from the outputted vibration signal by the detecting means, the pan / tilt judgment from the outputted vibration signal by said shake detecting means for pan / and signal obtaining means for panning / tilting decision to acquire the tilt judgment signal, on the basis of the correction amount calculation signal acquired by the correction amount calculation signal acquisition unit vibration for Correction amount calculation means for calculating a positive amount, and pan / tilt determination means for determining whether or not a pan / tilt operation is performed based on the pan / tilt determination signal acquired by the pan / tilt determination signal acquisition means. When the pan / tilt determination means determines that the pan / tilt operation is not being performed, the image displacement means causes the image displacement means to obtain a displacement amount corresponding to the correction amount calculated by the correction amount calculation means. Image blur correction is performed by canceling image blur caused by vibration applied to the optical system by displacement, and the image blur is detected when the pan / tilt determination means determines that the pan / tilt operation is performed. an image blur correction unit switches to mode when operating pan / tilt aspects of correction from aspects when no pan / tilt operation, a predetermined circumferential to the optical system The correction amount is calculated based on the correction amount calculation signal and the pan / tilt determination signal acquired by the correction amount calculation signal acquisition unit and the pan / tilt determination signal acquisition unit when a number of vibrations are applied. Adjusting means for adjusting the gain of at least one of the correction amount calculation signal and the pan / tilt determination signal so that the amplitude ratio between the correction signal and the pan / tilt determination signal becomes a predetermined value. It is characterized by that.

According to the present invention, a correction amount calculation signal for calculating a correction amount for vibration (a correction amount for canceling image blur) and a pan / tilt determination signal for determining whether or not a pan / tilt operation is performed. Since the amplitude ratio can be adjusted, it can be set to a suitable amplitude ratio so as not to cause a sense of incongruity in the movement behavior of the image on the photographing screen during the pan / tilt operation. Further, by adjusting the gain of at least one of the correction amount calculation signal and the pan / tilt determination signal, the amplitude ratio between the correction amount calculation signal and the pan / tilt determination signal can be adjusted to a desired value. .

  According to a second aspect of the present invention, in the image blur correction device according to the first aspect, the correction amount calculation signal acquisition unit is a signal obtained by performing predetermined preprocessing on the blur signal output by the shake detection unit. Is acquired as the correction amount calculation signal, and the pan / tilt determination signal acquisition means acquires, as a pan / tilt determination signal, a signal that is not subjected to the preprocessing on the shake signal output by the shake detection means. It is characterized by doing. The present invention acquires, as a correction amount calculation signal, a signal obtained by performing predetermined preprocessing on a shake signal output by the shake detection unit, and a signal obtained by performing no preprocessing on the shake signal output by the shake detection unit. Is obtained as a pan / tilt determination signal. According to this aspect, the correction amount calculation signal varies depending on the product due to variations in the characteristics of the preprocessing unit, and the relationship with the pan / tilt determination signal Therefore, there is a risk of causing a sense of incongruity in the movement behavior of the image during the pan / tilt operation. On the other hand, according to the present invention, the amplitude ratio between the correction amount calculation signal and the pan / tilt determination signal can be changed by the amplitude ratio changing means. Therefore, the correction amount is calculated by adjusting the amplitude ratio for each product. Since the relationship between the image signal and the pan / tilt determination signal can be corrected, it is possible to prevent a sense of incongruity from occurring in the movement behavior of the image during the pan / tilt operation.

According to a third aspect of the present invention, in the image blur correction device according to the first or second aspect , the adjustment unit includes at least one of the correction amount calculation signal acquisition unit and the pan / tilt determination signal acquisition unit. Any one of the gain adjusting means includes a gain adjusting means for performing an amplification process on a shake signal output from the shake detection means and capable of changing a gain value in the amplification process. It is characterized by. By providing a gain adjustment means for gain adjustment in at least one of the correction amount calculation signal acquisition means and the pan / tilt determination signal acquisition means as in the present invention, the correction amount calculation signal and the pan / tilt determination use are provided. The signal amplitude ratio can be adjusted to a desired value.

Image blur correction device according to claim 4 is the invention according to any one of claims 1 to 3, wherein the adjusting means, with respect to the vibration of a predetermined frequency of interest before Symbol image blur correction The gain adjustment is performed so that the amplitude ratio becomes a specific value .

According to a fifth aspect of the present invention , in the image blur correction apparatus according to any one of the first to fourth aspects, the image blur correction mode when the image blur correction unit is performing a pan / tilt operation. Is characterized in that the image blur correction is stopped or the effect of the image blur correction is reduced.

  According to the image blur correction apparatus of the present invention, it is possible to prevent a sense of incongruity from appearing on the shooting screen during pan / tilt operation.

  A preferred embodiment of an image blur correction apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram showing a first embodiment of an image blur correction apparatus according to the present invention. The image blur correction device is mounted on, for example, a lens device (photographing lens) for a television camera, a movie camera, or a still camera. The image stabilization lens 30 shown in FIG. It is arranged in an optical system such as a camera, and is arranged so as to be movable up and down (vertical direction) and left and right (horizontal direction) in a plane perpendicular to the optical axis of the optical system. The anti-vibration lens 30 is driven up and down or left and right by a motor 28. When vibration occurs in the camera (optical system), a position where image stabilization is corrected by the motor 28. It moves to (position where image shake due to vibration is canceled). The anti-vibration lens 30 is driven in the same manner based on the vibration generated in each direction in both the vertical direction and the horizontal direction, and therefore the image shake correction in one direction (for example, the horizontal direction) is shown in FIG. Only the configuration to be performed is shown, and the configuration is the same for other directions.

  In the figure, an angular velocity sensor 10 is a gyro sensor for detecting vibration of an optical system, and is installed on the upper surface of a lens barrel. From the angular velocity sensor 10, an electrical signal having a voltage corresponding to the angular velocity of vibration generated in the left-right direction of the optical system is output as an angular velocity signal.

  The angular velocity signal output from the angular velocity sensor 10 is amplified by the amplifier circuit 12 and then mainly DC component (low frequency component below a predetermined cutoff frequency) by a DC cut unit (high pass filter (HPF)) 14. Is blocked, and other frequency components pass through the DC cut unit 14. The angular velocity signal that has passed through the DC cut unit 14 is subsequently subjected to gain adjustment with respect to the angular velocity signal by a gain adjusting unit 16, which will be described in detail later, and then input to a low-pass filter (LPF) 18. In the LPF 18, high frequency components that are not subject to image blur correction are blocked from the frequency components of the input angular velocity signal, and other frequency components pass through the LPF 18. The angular velocity signal that has passed through the LPF 18 is converted into a digital signal by the A / D converter 20 and then input to the CPU 22. The angular velocity signal acquired by the CPU 22 through the pre-processing unit including the DC cut unit 14, the gain adjusting unit 16, and the LPF 18 is referred to as an angular velocity signal S1.

  The CPU 22 integrates the angular velocity signal S1 input as described above by digital filter arithmetic processing, and converts the angular velocity signal S1 into an angle signal. That is, the amount of displacement from the reference position of the image stabilizing lens 30 for displacing the image in the direction and size to cancel the image blur caused by the vibration of the optical system (in order to cancel the image blur and correct the image blur. Is obtained by integrating the angular velocity signal S1. Then, the obtained correction amount (angle signal) value is output as a value indicating the movement target position of the image stabilizing lens 30.

  The angle signal output from the CPU 22 is converted into an analog signal by the D / A converter 24 and then input to the motor drive circuit 26. The motor drive circuit 26 drives a motor 28 that moves the image stabilization lens 30 in the left-right direction, for example, and moves the image stabilization lens 30 to a position corresponding to the value of the angle signal output from the CPU 22. As a result, image blur due to vibration applied to the optical system is corrected.

  Note that the image blur correction method may be other than the method shown in the present embodiment. The system of the present embodiment uses an image displacement means that intentionally displaces the image formation position of the image formed by the optical system up and down or left and right within the image formation plane by displacing the vibration-proof lens 30. Therefore, the image displacement is corrected by displacing the image so as to cancel the image blur due to the vibration applied to the optical system. The image displacing means for intentionally displacing the image in this way does not have to use an anti-vibration lens as in the present embodiment. For example, an image for recording or reproduction can be obtained by displacing the image sensor of the camera. An image displacing unit that intentionally displaces an image by displacing an imaging range that effectively captures an image, or an image for recording or reproduction from within a range of a captured image captured by an imaging element of a camera Electronic image displacement means for intentionally displacing the image by displacing the signal extraction range may be used. In such other types of image blur correction, the angular velocity signal obtained from the angular velocity sensor 10 is subjected to integration processing or the like, so that the image is displaced with the amount of displacement necessary to cancel the image blur as in the present embodiment. A correction amount signal (corresponding to the angle signal) for displacing the image by the displacement means can be obtained.

  On the other hand, the angular velocity signal output from the angular velocity sensor 10 and amplified by the amplification circuit 12 is a signal line that is subjected to required preprocessing by the preprocessing unit including the DC cut unit 14, the gain adjustment unit 16, and the LPF 18. In addition to being input to the A / D converter 20 as an angular velocity signal S1 through the amplifier circuit 12, it is input to the A / D converter 20 through a signal line directly connected to the A / D converter 20 from the amplifier circuit 12 and not subjected to the preprocessing. The angular velocity signal is converted into a digital signal by the A / D converter 20 and acquired by the CPU 22 in parallel with the angular velocity signal S1.

  As a result, the CPU 22 acquires an angular velocity signal for pan / tilt determination that has not been preprocessed in parallel with the angular velocity signal S1 that has been preprocessed to calculate the correction amount (angle signal) described above. To do. In the following, the angular velocity signal S1 preprocessed by the preprocessing unit is referred to as a correction amount calculation signal S1, and preprocessing obtained through a signal line directly connected from the amplifier circuit 12 to the A / D converter 20 is referred to as a correction amount calculation signal S1. The angular velocity signal not applied is referred to as pan / tilt determination signal S2.

  The pan / tilt determination is a determination of whether or not the optical system is performing a pan / tilt operation, and various methods have been proposed as the determination method. In the present embodiment, for example, when the magnitude (absolute value magnitude) of the pan / tilt determination signal S2 that has not been preprocessed continuously exceeds a predetermined threshold value for a predetermined time or more. It is determined that the pan / tilt operation is performed, and otherwise, it is determined that the pan / tilt operation is not performed.

  The CPU 22 performs pan / tilt determination based on the pan / tilt determination signal S2, and executes the processing for stopping the above-described image blur correction when it is determined that the pan / tilt operation is performed. For example, the cutoff frequency of the DC cut unit (HPF) 14 is increased to substantially cut off the correction amount calculation signal S1. On the other hand, by continuously calculating the correction amount (angle signal), the correction amount gradually decreases to 0, and the image stabilization lens 30 is driven by driving the image stabilization lens 30 based on the correction amount. Moves to the reference position and stops. By stopping the image blur correction during the pan / tilt operation in this way, a problem caused by performing the image blur correction during the pan / tilt operation is prevented. If it is determined that the pan / tilt operation is being performed, the image blur correction may be stopped by another method. Further, when it is determined that the pan / tilt operation is being performed, the image blur correction may not be completely stopped, but the effectiveness of the image blur correction may be reduced.

  Next, gain adjustment in the gain adjustment unit 16 in the preprocessing unit will be described. The characteristics of the preprocessing units such as the DC cut unit 14 and the LPF 18 that preprocess the angular velocity signal output from the angular velocity sensor 10 vary among products (variation in resistance value, capacitor capacity, etc.). For this reason, the correction amount calculation signal S1 input to the CPU 22 varies from product to product in relation to the pan / tilt determination signal S2. For example, it is desirable that the amplitude Y1 of the correction amount calculation signal S1 and the amplitude Y2 of the pan / tilt determination signal S2 coincide with each other when vibration of a frequency targeted for image blur correction is applied to the optical system. That is, it is desirable that the amplitude ratio Y1 / Y2 is 1. However, in reality, the amplitude ratio Y1 / Y2 may not be 1 because there is variation in the characteristics of the preprocessing unit for each product.

  When the amplitude ratio Y1 / Y2 is not 1, the correction amount calculation signal S1 is compared with the pan / tilt determination signal S2 indicated by the waveform C2 obtained when the pan / tilt operation is started as shown in FIG. Indicates a waveform indicated by C1L when the amplitude ratio Y1 / Y2 is smaller than 1, and indicates a waveform indicated by C1H when the amplitude ratio Y1 / Y2 is larger than 1. When the amplitude ratio Y1 / Y2 is 1, the waveform of the correction amount calculation signal S1 substantially matches the waveform C2 of the pan / tilt determination signal S2.

  On the other hand, in pan / tilt determination, when the magnitude of the pan / tilt determination signal S2 continuously exceeds the threshold value Ys shown in FIG. Then, it is determined at time T1 that the pan / tilt operation is determined to be performed with respect to the pan / tilt determination signal S2 shown in FIG.

  In this case, in the case where the correction amount calculation signal S1 is the waveform C1L and the waveform C1H, the period from the start of the pan / tilt operation until it is determined that the pan / tilt operation is performed, Since the value at the time T1 when it is determined that the / tilt operation is performed is different from the pan / tilt determination signal S2 (the correction amount calculation signal S1 when the amplitude ratio Y1 / Y2 is 1), image blur correction is performed. The magnitude and change speed of the correction amount when the process is shifted to the stop process, that is, the displacement amount and the moving speed of the vibration-proof lens 30 are different from those when the amplitude ratio Y1 / Y2 is 1. This difference gives a sense of incongruity to the behavior of image movement on the shooting screen with respect to the pan / tilt operation of the camera to which the present image blur correction apparatus is applied.

  Therefore, as shown in FIG. 1, the gain adjustment unit 16 is arranged in the preprocessing unit for obtaining the correction amount calculation signal S1, and the gain adjustment unit 16 adjusts the gain of the correction amount calculation signal S1. Also in the product, the magnitude of the correction amount calculation signal S1 can be corrected so that the amplitude ratio Y1 / Y2 becomes 1. The gain adjusting unit 16 amplifies the input angular velocity signal with a variable gain value, and outputs the amplified angular velocity signal. Adjustment of the gain value (gain) in the gain adjusting unit 16 can be performed in the following first to third methods.

  In the first method, the gain value of the gain adjusting unit 16 can be changed by a predetermined adjustment knob that is manually operated. Then, at the time of adjusting the gain value, vibration of a predetermined frequency that is an object of image blur correction is intentionally applied to the optical system. This vibration may be generated with a predetermined device, for example, with a predetermined frequency and a constant amplitude, or may be one in which an operator applies an appropriate vibration to the optical system.

  At this time, the amplitude Y1 of the correction amount calculation signal S1 input to the CPU 22 and the amplitude Y2 of the pan / tilt determination signal S2 are observed by some method. For example, the correction amount calculation signal S1 and the pan / tilt determination signal S2 immediately before being input to the A / D converter 20, or the correction amount calculation signal S1 and the pan / tilt determination signal S2 input to the CPU 22 are used. May be output to an external measuring device such as an oscilloscope to observe the waveforms as they are. Alternatively, the CPU 22 causes the CPU 22 to execute a gain adjustment program using a predetermined switch, and the CPU 22 measures the amplitudes Y1 and Y2 of the correction amount calculation signal S1 and the pan / tilt determination signal S2 input to the CPU 22, and the measured amplitudes. The data of Y1, Y2 (or amplitude ratio Y1 / Y2) may be displayed on an external device, an image blur correction device, a display installed in a camera, or the like.

  Then, the operator observes the amplitude Y1 of the correction amount calculation signal S1 and the amplitude Y2 of the pan / tilt determination signal S2, and adjusts the gain adjustment unit 16 so that the amplitude Y1 and the amplitude Y2 coincide with each other. Adjust the gain value manually by operating the knob. Thus, the amplitude ratio Y1 / Y2 can be set to 1 in all products. It should be noted that when the amplitude ratio Y1 / Y2 is other than 1, there is a case where the behavior of starting movement of the image on the shooting screen with respect to the pan / tilt operation is more preferable, and it is not always necessary to set the amplitude ratio Y1 / Y2 to 1. Instead, it may be set to a specific value other than 1 or a value that provides a suitable behavior for each user.

  In the second method, similarly to the first method, the gain value of the gain adjusting unit 16 can be changed by a predetermined adjustment knob that is manually operated. When the image stabilization apparatus is actually used with a camera or the like, the behavior of the movement of the image on the shooting screen when the pan / tilt operation is performed is observed, and the movement movement behavior of the image is suitable. The operator adjusts the gain value of the gain adjusting unit 16 by trial and error using an adjustment knob so that In this case, the amplitude ratio Y1 / Y2 is not necessarily 1 or a specific value, but it is not a problem that the amplitude ratio Y1 / Y2 is not 1 because the amplitude ratio is set as a preferable state.

  In the third method, the gain value of the gain adjustment unit 16 can be changed by a control signal from the CPU 22. Then, similarly to the first method, vibration of a predetermined frequency that is an object of image blur correction is intentionally applied to the optical system. Further, the CPU 22 is caused to execute a gain adjustment program by a predetermined switch. When the CPU 22 executes the program, it measures the amplitude Y1 of the correction amount calculation signal S1 input to the CPU 22 and the amplitude Y2 of the pan / tilt determination signal S2, and the amplitude ratio Y1 / Y2 based on the measured amplitudes Y1 and Y2. The gain value of the gain adjusting unit 16 is adjusted so that becomes 1 or a specific value. According to the third method, the gain value of the gain adjusting unit 16 is automatically adjusted. It should be noted that an operator or the like may be able to input an instruction to the CPU 22 by a predetermined input means as to what value the amplitude ratio Y1 / Y2 is set to.

  Next, FIG. 3 is a block diagram showing a second embodiment of the image blur correction apparatus according to the present invention. In this figure, blocks that operate in the same manner as in FIG. 1 are assigned the same reference numerals as in FIG. 1, and descriptions thereof are omitted. In the image shake correction apparatus of FIG. 2, the gain adjustment unit 16 shown in the image shake correction apparatus of FIG. 1 is not arranged in the preprocessing unit, and the gain adjustment of the correction amount calculation signal S1 is performed by the CPU 22. . The CPU 22 is connected to an EEPROM 32 as a readable / writable memory, and the EEPROM 32 stores a gain value for adjusting the gain of the correction amount calculation signal S1. The CPU 22 reads the gain value stored in the EEPROM 32, and amplifies the correction amount calculation signal S1 acquired from the signal line including the DC cut unit 14 and the preprocessing unit of the LPF 18 with the gain value. The amplified correction amount calculation signal S1 is integrated to calculate a correction amount.

  On the other hand, the gain value data stored in the EEPROM 32 can be rewritten to a desired value by the CPU 22, and the gain value can be adjusted by rewriting the gain value. Therefore, for each product, for example, when vibration of a frequency targeted for image blur correction is applied to the optical system, the amplitude ratio Y1 / Y2 between the amplitude Y1 of the angular velocity signal S1 and the amplitude Y2 of the angular velocity signal S2 is 1. By adjusting the gain value stored in the EEPROM 32 in such a manner, it is possible to eliminate variations in the correction amount calculation signal S1 for each product with respect to the pan / tilt determination signal S2.

  The adjustment of the gain value in the second embodiment can be performed as in the following first to third methods, similarly to the first to third methods in the first embodiment.

  In the first method, it is assumed that the gain value stored in the EEPROM 32 can be changed by the EEPROM rewriting means (rewriting tool) 34. The EEPROM rewriting means 34 is a means for instructing the CPU 22 to rewrite the data in the EEPROM 32 and instructing the contents of the data to be rewritten. Then, at the time of adjusting the gain value, vibration of a predetermined frequency that is an object of image blur correction is intentionally applied to the optical system. At this time, the operator observes the amplitude Y1 of the correction amount calculation signal S1 and the amplitude Y2 of the pan / tilt determination signal S2 input to the CPU 22 in the same manner as in the first method in the first embodiment. The gain value where the amplitude Y1 and the amplitude Y2 match (the amplitude ratio Y1 / Y2 is 1) is obtained. Then, the obtained gain value is stored in the EEPROM 32 using the EEPROM rewriting means 34. Thus, the amplitude ratio Y1 / Y2 can be set to 1 in all products. As described in the first embodiment, when the amplitude ratio Y1 / Y2 is other than 1, the movement behavior of the image on the photographing screen with respect to the pan / tilt operation may be more preferable, and the amplitude is not necessarily limited. The ratio Y1 / Y2 does not need to be set to 1, and may be set to a specific value other than 1 or a value that provides a suitable behavior for each user.

  In the second method, it is assumed that the gain value of the gain adjusting unit can be changed by the EEPROM rewriting means 34 as in the first method. When the image shake correction apparatus is actually used with a camera, the behavior of the movement of the image on the shooting screen when the pan / tilt operation is performed is observed, and the behavior of the movement of the image is favorable. The gain value is predicted by the operator and stored in the EEPROM 32 using the EEPROM rewriting means 34. When this operation is repeated several times and the behavior of starting movement of the image on the shooting screen is in a suitable state, the operation is finished, and the gain value is adjusted with the gain value stored in the EEPROM 32 at that time. finish. In this case, the amplitude ratio Y1 / Y2 is not necessarily 1 or a specific value, but it is not a problem that the amplitude ratio Y1 / Y2 is not 1 because the amplitude ratio is set as a preferable state as described above.

  In the third method, the gain value of the gain adjusting unit is automatically changed by the CPU 22, and the EEPROM rewriting means 34 as shown in FIG. 3 is not necessary. Then, similarly to the first method, vibration of a predetermined frequency that is an object of image blur correction is intentionally applied to the optical system. Further, the CPU 22 is caused to execute a gain value adjustment program by a predetermined switch. When the CPU 22 executes the program, it measures the amplitude Y1 of the correction amount calculation signal S1 input to the CPU 22 and the amplitude Y2 of the pan / tilt determination signal S2, and the amplitude ratio Y1 / Y2 based on the measured amplitudes Y1 and Y2. Is determined to be 1 or a specific value, and the gain value is written in the EEPROM 32. According to the third method, the gain value in the gain adjustment is automatically adjusted. Note that the user or the like may be able to instruct the CPU by a predetermined input means as to what value the amplitude ratio Y1 / Y2 should be set to.

  As described above, in the above embodiment, the vibration applied to the optical system is detected by the angular velocity sensor, the correction amount is calculated based on the angular velocity signal output from the angular velocity sensor, and the pan / tilt determination is performed. However, the vibration applied to the optical system is detected by a shake detection means other than the angular velocity sensor, for example, an angular acceleration sensor, an acceleration sensor, a speed sensor, an angular displacement sensor, or a displacement sensor. The present invention can also be applied to the case where correction amount calculation and pan / tilt determination are performed based on an output shake signal.

  In the above-described embodiment, the case where the image blur correction is stopped or the effect of the image blur correction is reduced as an image blur correction mode when the pan / tilt operation is performed is described. However, the pan / tilt operation is performed. The image blur correction mode in this case is not limited to this, and the present invention switches between the image blur correction mode when the pan / tilt operation is not performed and the image blur correction mode when the pan / tilt operation is performed. Applicable to.

FIG. 1 is a configuration diagram showing a first embodiment of an image blur correction apparatus according to the present invention. FIG. 2 is an explanatory diagram used for explaining the relationship between the correction amount calculation signal and the pan / tilt determination signal. FIG. 3 is a block diagram showing a second embodiment of the image blur correction apparatus according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Angular velocity sensor, 12 ... Amplifier circuit, 14 ... DC cut part (HPF), 16 ... Gain adjustment part, 18 ... LPF, 20 ... A / D converter, 22 ... CPU, 24 ... D / A converter, 26 ... Motor drive circuit, 28 ... motor, 30 ... anti-vibration lens, 32 ... EEPROM, 34 ... EEPROM rewriting means

Claims (5)

An image displacement means for displacing the image by displacing an image formation position on an image formation plane of an image formed by the optical system, or an image pickup range effectively picked up as an image for recording or reproduction among the images;
A shake detecting means for detecting a vibration applied to the optical system and outputting a shake signal corresponding to the detected vibration;
A correction amount calculation signal obtaining means for obtaining the correction amount calculation signal for calculating the correction amount with respect to vibration from the outputted vibration signal by said shake detecting means,
And obtaining the pan / tilt judgment signal pan / tilt determination for signal acquisition means for pan / tilt judgment from the outputted vibration signal by said shake detecting means,
Correction amount calculation means for calculating a correction amount for vibration based on the correction amount calculation signal acquired by the correction amount calculation signal acquisition means;
Pan / tilt determination means for determining whether or not a pan / tilt operation is performed based on the pan / tilt determination signal acquired by the pan / tilt determination signal acquisition means;
When the pan / tilt determination means determines that the pan / tilt operation is not being performed, the image displacement means displaces the image so that the displacement amount corresponds to the correction amount calculated by the correction amount calculation means. The image blur correction is performed by canceling the image blur caused by the vibration applied to the optical system, and when the pan / tilt determination means determines that the pan / tilt operation is performed, the image blur correction is performed. Image blur correction means for switching the mode from the mode when the pan / tilt operation is not performed to the mode when the pan / tilt operation is performed;
Based on the correction amount calculation signal and the pan / tilt determination signal acquired by the correction amount calculation signal acquisition unit and the pan / tilt determination signal acquisition unit when vibration of a predetermined frequency is applied to the optical system. Adjustment for performing gain adjustment of at least one of the correction amount calculation signal and the pan / tilt determination signal so that the amplitude ratio between the correction amount calculation signal and the pan / tilt determination signal becomes a predetermined value. Means,
An image blur correction apparatus comprising:   The correction amount calculation signal acquisition unit acquires, as the correction amount calculation signal, a signal obtained by performing predetermined preprocessing on the shake signal output by the shake detection unit, and the pan / tilt determination signal acquisition unit 2. The image blur correction apparatus according to claim 1, wherein a signal which is not subjected to the pre-processing on a shake signal output by the shake detection means is acquired as a pan / tilt determination signal. The adjustment means is a gain adjustment means provided in at least one of the correction amount calculation signal acquisition means and the pan / tilt determination signal acquisition means. The adjustment means outputs a shake signal output from the shake detection means. 3. The image blur correction apparatus according to claim 1, further comprising a gain adjusting unit that performs amplification processing on the gain and can change a gain value in the amplification processing. The adjusting means, which of the claims 1 to 3 wherein the amplitude ratio with respect to the vibration of a predetermined frequency of interest before Symbol image blur correction and performs the gain adjustment so that the specific value The image blur correction device according to claim 1. The image blur correction mode when the pan / tilt operation is performed in the image blur correction unit is a mode in which the image blur correction is stopped or the effectiveness of the image blur correction is reduced. Item 5. The image blur correction device according to any one of Items 1 to 4 .

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