KR20100112788A - Method of controlling activation between shaking correction and electronical strobo, method of photographing, and digital camera module - Google Patents

Abstract

PURPOSE: A control method of a flash function, a photographing method using the same and a digital camera module for increasing the convenience of user selection are provided to maximize a flash function and a hand shaking correcting function. CONSTITUTION: The availability of the hand shake compensation function and flash function is decided based on the shutter speed and movement amount of the digital camera module. The shutter speed about the photographing object is gotten in a lens(11). The movement amount of the digital camera is obtained.

Description

Method of controlling activation between shaking correction and electronical strobo, method of photographing, and digital camera module

The present invention relates to a method for controlling an image stabilizer function and a flash function, a photographing method using the same, and a digital camera module, and more particularly, to an image stabilizer function and a flash function in a camera module having both a camera shake correction function and a flash function. It relates to a control method and a photographing method.

Digital cameras are imaging devices that use image sensors such as CCD and CMOS instead of film. The digital camera has a flash function to obtain an appropriate exposure picture in an environment in which light is insufficient, and has a camera shake correction function to prevent image shaking due to camera shake during shooting.

In a conventional digital camera, the shutter speed is generally controlled to prevent a camera shake that may occur due to a lack of light during flash use. When the flash function is activated, camera shake is suppressed by the faster shutter speed.Therefore, the camera shake correction function does not need to be operated.When using the xenon flash, continuous shooting is limited due to the delay of charging time after light emission. Since the image stabilization function of the image synthesizing method (DIS method) is technically difficult to implement, the user interface is often created so that the flash function and the image stabilization function are not used simultaneously. That is, the flash function and the image stabilization function are controlled to prevent the two functions from being activated at the same time because the same function of image stabilization is overlapped, and the user arbitrarily sets which function to use at the time of shooting.

However, the use of the digital image stabilization (DIS) image stabilization function in bright outdoors may result in deterioration of the image quality. Because digital image stabilization is a method of taking multiple images at high shutter speed and composing them together, deterioration of image quality due to unnecessary synthesis is involved. Also, if you use the flash function in a lighted indoor environment, people may come out bright, but the background may appear dark (image saturation), and even if you use the image stabilization function to recognize this problem, image quality may deteriorate. have. As described above, it is difficult to determine whether the user uses the flash function or the image stabilization function under various possible exposure conditions and camera shake conditions.

The method of controlling the camera shake function and the flash function, the photographing method using the same, and the digital camera module according to the present invention eliminate the error of subjective judgment of the user under various exposure and camera shake conditions, and adjust the flash function according to the exposure and camera shake conditions at the time of shooting. And the image stabilization function.

In order to solve the above problems, according to an aspect of the present invention, determining whether to use the flash function and the image stabilization function based on the shutter speed and the amount of motion of the digital camera having a flash function and a camera shake correction function A control method of an anti-shake function and a flash function including a is disclosed.

The control method may further include acquiring a shutter speed with respect to a photographing target and acquiring an amount of movement of the digital camera before the determining.

The determining may include determining which control mode corresponds to a first control mode, a second control mode, and a third control mode sequentially divided from a slow speed according to the shutter speed based on the obtained shutter speed. Include. When the shutter speed corresponds to the second control mode, which control mode corresponds to which of the 2A control mode and the 2B control mode, which are sequentially divided from the large movement amount according to the movement amount based on the obtained movement amount The method may further include determining.

The first shutter speed threshold as a reference for distinguishing the first control mode and the second control mode is slower than the second shutter speed threshold as a reference for distinguishing the second control mode and the third control mode. The first and second shutter speed thresholds may be predetermined.

The flash control function is used in the first control mode and the second control mode, but the camera shake correction function is not used. In the second control mode, the camera shake function is used without the flash function. In the 3 control mode, neither the flash function nor the camera shake correction function is used.

The shutter speed and the movement amount in the obtaining of the shutter speed and the movement amount may be obtained with respect to the preview image immediately before the release button for photographing is pressed.

The amount of movement may be obtained by using an electrical signal representing the preview image. In contrast, the movement amount may be obtained by using a signal from a motion sensor built in the digital camera.

According to another aspect of the invention, (i) acquiring a preview image before shooting, (ii) acquiring a shutter speed for the preview image, (iii) acquiring an amount of motion of the digital camera, (iv) determining whether to use a flash function and a camera shake correction function based on the shutter speed and the amount of movement, and (v) photographing an image according to a function determined to be used in the determining step. The method is disclosed.

In the determining step, when the obtained shutter speed is lower than the first shutter speed threshold, the flash function is used but the camera shake correction function is not used, and the second shutter is faster than the first shutter speed threshold. When it is faster than the speed threshold, it may be determined not to use both the flash function and the camera shake correction function.

When the motion is greater than the first shutter speed threshold and slower than the second shutter speed threshold and the amount of movement is greater than the amount of movement threshold, the flash function is used but the camera shake correction function is not used. It may be determined to use the image stabilization function but not use the flash function when it is faster than a threshold and slower than the second shutter speed threshold and the movement amount is smaller than the movement amount threshold.

According to another aspect of the invention, (i) an image sensor for converting light representing the image of the subject into an electrical signal, (ii) a lens for condensing light representing the image of the subject to the image sensor, (iii) A flash unit for irradiating light to a subject, (iv) a camera shake correction unit for preventing a shake from occurring in a shot image, and (v) generating a shot image using the electrical signal, wherein the flash unit and the camera shake correction unit And a control unit for controlling the driving of the control unit, wherein the control unit acquires a shutter speed and an amount of movement with respect to the preview image before shooting, and based on the obtained shutter speed and the amount of movement of the flash unit and the camera shake correction unit. Disclosed is a digital camera module configured to selectively combine and control driving.

The control unit, when the obtained shutter speed is slower than the first shutter speed threshold, the flash unit is driven but the camera shake correction unit is controlled to not drive, the second shutter faster than the first shutter speed threshold When it is faster than the speed threshold, the flash unit and the camera shake correction unit are controlled to not drive both, and are faster than the first shutter speed threshold and slower than the second shutter speed threshold, and the movement amount is greater than the movement amount threshold. When the flash unit is driven, the camera shake correction unit is controlled not to be driven, and when the amount of movement is less than the amount of movement threshold, faster than the first shutter speed threshold and lower than the second shutter speed threshold. The calibration unit drives but the flash unit Control not to drive.

The camera shake correction unit uses a digital image stabilization method that synthesizes two or more captured images to compensate for camera shake, or compensates for camera shake by using images captured by applying vibration to the lens unit or the image sensor. Optical image stabilization may additionally be used.

The method for controlling the camera shake function and the flash function, the photographing method including the same, and the digital camera module according to an embodiment of the present invention adopt the concept of smart flash (SF) to control the exposure environment and the degree of movement of the camera itself. Determine whether the flash should be popped or whether the camera shake correction should be performed to maximize the harmony between the camera shake correction function and the flash function. Therefore, it is possible to minimize image capture failure due to misjudgement of the user and increase convenience of user selection.

Hereinafter, with reference to the embodiments shown in the accompanying drawings, the present invention will be described in detail.

1 is a block diagram showing an internal configuration of a digital camera module according to an embodiment of the present invention. The digital camera module includes an optical system 10, a control unit 20, a flash unit 30, a central processing unit 40, a display unit 50, an input unit 60, a memory 70, and a recording medium 80. ).

In this embodiment, the optical system 10 may include a lens 11, a shutter 12, and an image sensor 13. In another embodiment, the optical system may further include an aperture (not shown). As another embodiment, the optical system may further include a zooming mechanism (not shown). As another embodiment, the optical system may further include a focusing mechanism (not shown).

The optical system 10 forms the light representing the image of the subject through the lenses 11 to the image sensor 13. The shutter 12 adjusts an exposure time at which light representing an image of the subject is incident on the image sensor 13. The image sensor 13 may be an image sensor capable of photoelectric conversion, for example, a charge coupled diode (CCD) sensor or a complementary metal-oxidie semiconductor (CMOS) sensor, and converts light received by each image sensor 13. Generate an electrical signal.

The control unit 20 may include a signal processor 21, an image processor 22, and a camera shake correction unit 23.

The signal processor 21 amplifies and outputs the analog image signal output from the image sensor 13 into digital image data, and converts the digital image data into image data in a predetermined format, for example, RGB or YUV format. can do.

The image processor 22 appropriately enlarges / reduces the number of pixels or displays the image data from the signal processor 21 on the display unit 50 or displays the image data on the display unit 50. In addition, the image data can be compressed / extended into a JPEG format or the like. In addition, the image processor 22 may perform automatic exposure control (AE) and / or auto-focus control (AF).

The camera shake correction unit 23 serves to candidate-look (combine) the photo on which the shake has occurred so that the shake does not appear to have occurred. The embodiment in which the image stabilization unit 23 is included in the control unit is a case of using a digital image stabilization (DIS) method as the image stabilization method. The DIS method combines two or more captured images to compensate for camera shake.

Alternatively, an embodiment in which the camera shake correction unit 23 exists separately from the control unit is possible. In this embodiment, the image stabilization unit 23 detects a vibration applied to the optical system 10 and generates a vibration in a direction to cancel the vibration, thereby obtaining optical image stabilization (OIS). Use the method. As another embodiment, the image stabilizer 23 may use both the DIS method and the OIS method.

Such a control unit 20 may be implemented by an image signal processor (ISP). In addition, the control unit 20 may be implemented by a digital signal processor (DSP). In addition, the control unit 20 may be implemented by a DSP of a built-in type ISP.

On the other hand, although the analog video signal from the image sensor 13 may be converted into a digital video signal by the signal processing unit of the control unit 20, the control unit 20 may be converted by a separate A / D converter. Image processing may also be performed by directly receiving a digital image signal. In addition, when the image sensor 13 is a CMOS, since a digital image signal is directly output from the image sensor 13, it may not be necessary to undergo a separate digital conversion process.

The flash unit 30 plays a role of artificially irradiating light onto a subject in order to secure an appropriate amount of light even in an environment in which light is insufficient and to obtain a photograph of an appropriate exposure. The flash unit 30 may prevent the camera shake phenomenon that may occur in the insufficient light amount by increasing the shutter speed when the flash function is used. In the digital camera module according to an embodiment of the present invention, the flash unit 30 may be driven by the control unit 20. Alternatively, the flash unit 30 may be driven by the central processing unit.

The central processing unit 40 has input / output functions, arithmetic functions, and control functions to control the overall operation of the digital camera module. For example, the central processing unit 40 may receive a user's command from the input unit 60 to activate a photographing mode to enable the signal processing unit 21 and the image processing unit 22 to function. The image can be recorded on the recording medium 80 or the like. The recording medium 80 may be a semiconductor storage medium, an optical storage medium, a magneto-optical disc, a magnetic disc, or the like.

The memory 70 may be a ROM and / or a RAM, and may store a program for driving the central processing unit 40 and / or the control unit 20, and variables or state information related to the program.

1 illustrates a central processing unit 40 in FIG. 1, but an embodiment in which the central processing unit 40 and the control unit 20 are combined in one processor is possible. It will be said that it is included in the protection scope of the present invention. As another embodiment, the digital camera module according to the embodiment of the present invention does not include a separate central processing unit 40 in addition to the control unit 20, and is a digital device, for example, digital, in which a digital camera module is used. The central processing unit 40 of a camera, a camera phone, a PDA, and a portable multimedia player (PMP) can also be used.

Of course, the protection range of the digital camera module of the present invention is not limited to the embodiment shown in FIG. Will belong.

Hereinafter, a method of controlling the flash function and the hand shake correction function in the control unit 20 according to the embodiments of the present invention will be described.

2 is a flowchart illustrating a control method of a flash function and a camera shake correction function and a photographing method including the same according to an embodiment of the present invention.

When the user selects the shooting mode through the input unit 60, the control unit 20 continuously displays images before shooting, for example, preview images immediately before shooting in the case of a camera module having the display unit 50. Acquire (S100).

When the user presses the shooting button, the shutter speed and the movement amount of the subject corresponding to the image immediately before shooting are measured (S110). At this time, the shutter speed can be measured by using a conventional shutter speed measurement method in which the flash function and the camera shake correction function are not operated. For example, the shutter speed may be determined using the luminance value, the aperture value, and the ISO sensitivity of the subject. In the measurement of the amount of motion, the amount of motion can be determined by analyzing the electrical signal information constituting the preview image immediately before photographing. The amount of movement can be computed within the ISP, or in the DSP for a system without a separate ISP. On the contrary, in the case of a digital electronic device employing a separate motion sensor (not shown), the amount of motion of the digital camera module may be obtained by the motion sensor.

The control unit 20 now determines which control mode section the current photographing state corresponds to based on the calculated shutter speed. If the calculated shutter speed is slower than the first shutter speed threshold (S120), the first control mode is set (S130). If the calculated shutter speed is faster than the second shutter speed threshold (S121), the third control mode. If the calculated shutter speed is faster than the first shutter speed threshold but slower than the second shutter speed threshold (S122), the second control mode is set (S132 and S133).

If it is the second control mode, it is further determined whether the current photographing state corresponds to the control mode of the 2A control mode and the 2B control mode based on the amount of movement (S122). If the calculated motion amount is greater than the motion amount threshold value, it is set to the second A control mode (S132). If the calculated motion amount is smaller than the motion amount threshold value, it is set to the second B control mode (S133).

According to the control mode determined as described above, it is determined whether to use the flash function and the image stabilizer function, and the actual shooting is performed. At this time, the photographing method after the automatic selection of the use function is the same as the usual photographing method. For example, if the control mode is determined to use only the flash function, then the shooting method thereafter is the same as the shooting method when the user selects to activate the flash function and presses the release button in the general camera.

The first control mode is used when the shutter speed is slowest than the other control modes so that the amount of light required for imaging is insufficient and the exposure time is long. In other words, unless a user takes a still image by using a tripod, if a normal user takes a picture by hand, a shake picture may be obtained. In the case of the first control mode in which the shutter speed in the exposure condition of the subject to be photographed is slower than the first shutter speed threshold value, the digital camera module of the present invention operates the flash and controls not to perform the camera shake correction. In other words, in a dark environment where the shutter speed is very slow, the flash function is used instead of the image stabilization function to secure the amount of light and prevent the blurring image. This is because the darker the subject, the slower the shutter speed, so that even when continuous shooting is performed with a faster shutter speed, blurring of the synthesized images after continuous shooting becomes severe, thereby reducing the effect of the DIS method of image stabilization. Therefore, it is much more efficient to use the flash function than the image stabilization function in a dark environment.

The third control mode is used when the shutter speed is faster than the other control modes so that the amount of light required for shooting is large so that the exposure time is shortened. That is, it is used when the shake picture is hardly generated in the environment of the user's normal hand shake that occurs when the user directly photographs by hand. In the third control mode in which the shutter speed in the exposure condition of the subject to be shot is faster than the second shutter speed threshold value, the digital camera module of the present invention is controlled so as not to operate both camera shake correction and flash. This is because in a bright environment with a fast shutter speed, the amount of light is sufficient, and there is no need to operate the flash, and because the shutter speed is fast, the image is not shaken by a certain amount of camera shake. In particular, when the DIS method of image stabilization is performed under bright outdoor exposure conditions, a plurality of photographed images are forcibly synthesized, resulting in a deterioration in image quality.

On the other hand, the 2A control mode corresponds to a medium range in which the amount of light required for shooting is not small or large, so that the shutter speed is faster than that of the first control mode and slower than that of the third control mode, and the amount of motion is the threshold of the amount of motion. Used for larger cases. In the case of the 2A control mode in which the shutter speed in the exposure condition of the subject to be shot is faster than the first shutter speed threshold and slower than the second shutter speed threshold, and used when the amount of movement is large, the digital camera module of the present invention uses a flash. Is controlled so as not to perform image stabilization. That is, in normal indoor lighting conditions where the shutter speed is not very slow or fast, it is easy to cause the image to shake and the light is insufficient. Therefore, the flash is operated to compensate for the amount of light while preventing image shake or image stabilization. This prevents the saturation of the image while preventing the blurring of the image. It operates only the flash because the amount of motion is excessive. Because if the amount of motion exceeds the performance limit of the image stabilization function, even if image stabilization is performed, the image quality of the captured image deteriorates. Therefore, even if there is an image saturation, it is better to operate the flash function to prevent image blur.

On the other hand, the 2B control mode corresponds to a medium range in which the amount of light required for shooting is not small or large, so that the shutter speed is faster than that of the first control mode and slower than that of the third control mode, and the amount of motion is the threshold of the amount of motion. Used for smaller cases. In the case of the 2B control mode in which the shutter speed in the exposure condition of the subject to be shot is faster than the first shutter speed threshold and slower than the second shutter speed threshold, and used when the amount of movement is small, the digital camera module of the present invention uses a flash. Is controlled to perform only image stabilization without operating. In other words, in a normal indoor lighting environment where the shutter speed is not very slow or fast, it is easy to cause image shake and the light quantity is insufficient. Therefore, the flash is operated to compensate for the amount of light while preventing image shake or image stabilization. This prevents the saturation of the image while preventing the shaking of the image. Since the amount of motion is not large, only the image stabilization is performed. Because the image is bright when the flash function is activated, but the background around it is dark, it is easy to cause image saturation, while the amount of motion does not exceed the performance limit of the image stabilization function. Because it can also prevent image saturation.

For example, a method of determining the first and second shutter speed threshold values may be performed by hand by the user's standard of normal level while changing the illuminance around the subject without both the image stabilization function and the flash function being operated. After performing the operation, it is judged whether or not the shaking occurs in the photographed picture, and if the photographing of the stationary subject is performed by using a tripod, the blurring range of the shutter speed corresponding to the illuminance range is obtained. The fastest shutter speed is set as the first shutter speed threshold, and the shutter speed range that corresponds to the illuminance range in which a shake picture hardly occurs in an environment of a normal camera shake that occurs when a user shoots by hand is the most. The slow shutter speed can be the second shutter speed threshold. The first and second shutter speed thresholds may be subjectively determined because they determine the degree of shaking of the photographed image, and therefore, it should be understood by those skilled in the art that any number of modifications and corrections can be made, and within the range of the ordinary creative ability of those skilled in the art. It will be said that belongs to the protection scope of the present invention.

The amount of motion threshold may cause the shake of the captured image to operate only the image stabilization function when the flash function is activated only in a shooting condition that has a shutter speed faster than the first shutter speed threshold and slower than the second shutter speed threshold. It may be determined by the amount of movement when the image is smaller than the shaking of the captured image. In other words, it is possible to obtain a motion threshold by comparing the shake between the image captured with only the flash function and the image stabilized with only the camera shake correction function while changing the aperture value, ISO sensitivity and luminance within a predetermined range. do.

One thing to note is that even in the 2A control mode in a slightly brighter environment where the shutter speed is faster than the first shutter speed threshold, if the amount of movement is excessively large, only the flash is operated as in the first control mode in the dark environment. . If there is excessive movement to the extent that the amount of motion exceeds the performance limit of the image stabilization function, even if image stabilization is performed, the image quality of the captured image is deteriorated. Therefore, it is better to operate the flash function to prevent image blur even if image saturation occurs.

FIG. 4 shows photographed images when the combination of use between the flash function and the image stabilization function is different in an indoor illuminance environment of 240 Lux.

If you do not operate both the flash function and the image stabilization function, you can see that the captured image is severely shaken. Because the shutter speed is slow because the exposure time is increased to compensate for the insufficient amount of light because the flash is not used, the camera shake is caused by the long shooting time.

When only image stabilization is performed, it can be confirmed that the captured image is less shaken than in the previous shooting conditions, but still there is shake. On the other hand, when only the flash is operated, it can be seen that the shake is hardly generated in the captured image. From this, when the shooting environment is 240 Lux and is present between the first shutter speed threshold value and the second shutter speed threshold value, the amount of motion is determined based on how large the amount of motion due to the user's hand shake is greater than the amount of motion threshold. It can be seen that it is more advantageous to use only the flash function than the image stabilization function.

The control method of the flash function and the camera shake correction function described so far may be performed when the user sets the shooting mode (flash and the camera shake correction mode) to a specific mode, for example, the smart flash mode.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. For example, for digital cameras with forced flash mode, auto mode, red-eye reduction mode, flash off mode, and slow synchro mode as the flash mode, add smart flash mode and let the user select the smart flash mode and shoot. By using the above-described control method of the flash function and the image stabilization function can be used. On the contrary, the digital camera module includes only the smart flash mode so that the operation between the flash function and the camera shake correction function can be adjusted according to the control method of the flash function and the camera shake correction function described above without a user's judgment. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The present invention can be used in the industry of manufacturing and using digital camera modules.

1 is a block diagram showing an internal configuration of a digital camera module according to an embodiment of the present invention.

2 is a flowchart illustrating a control method of a flash function and a camera shake correction function and a photographing method including the same according to an embodiment of the present invention.

3 is a diagram illustrating a control mode for controlling an operation between a flash function and a camera shake correction function according to a shutter speed and an amount of motion.

FIG. 4 is a view showing photographed images when the combination of use between the flash function and the image stabilization function is different in an environment of indoor illuminance of 240 Lux.

Claims (14)

And determining whether to use the flash function and the image stabilizer function based on the shutter speed and the amount of motion of the digital camera module having the flash function and the image stabilizer function. According to claim 1, Before the determining step, Obtaining a shutter speed for a shooting target; and And obtaining an amount of movement of the digital camera. The method of claim 2, The determining step, Determining which control mode corresponds to a first control mode, a second control mode, and a third control mode sequentially divided from a slow speed according to the shutter speed based on the obtained shutter speed; When the shutter speed corresponds to the second control mode, which control mode corresponds to which of the 2A control mode and the 2B control mode, which are sequentially divided from the large movement amount according to the movement amount based on the obtained movement amount The control method further comprises the step of determining. The method of claim 3, The first shutter speed threshold as a reference for distinguishing the first control mode and the second control mode is slower than the second shutter speed threshold as a reference for distinguishing the second control mode and the third control mode. And the first and second shutter speed thresholds are predetermined. The method according to claim 3 or 4, The flash control function is used in the first control mode and the second control mode, but the camera shake correction function is not used. In the second control mode, the camera shake function is used without the flash function. 3) A control method in which neither the flash function nor the camera shake correction function is used in the control mode. The method according to claim 2 or 4, And the shutter speed and the movement amount in the obtaining of the shutter speed and the movement amount are obtained for an image of a subject immediately before the release button for photographing is pressed. The method according to claim 6, The amount of movement is obtained by using an electrical signal representing the image of the subject. The method according to claim 6, The amount of motion is obtained by using a signal from a motion sensor built in the digital camera module. Obtaining an image of a subject immediately before photographing; Obtaining a shutter speed for an image of the subject; Obtaining an amount of movement of the digital camera; Determining whether to use a flash function and a camera shake correction function based on the shutter speed and the amount of motion; And And capturing an image using a function whose use is determined in the determining step. The method of claim 9, In the determining step, the obtained shutter speed is Determine to use the flash function but not the camera shake correction function when it is slower than a first shutter speed threshold; Determining not to use both the flash function and the camera shake correction function when it is faster than the first shutter speed threshold and faster than the second shutter speed threshold, Determining that the flash function is used but the image stabilization function is not used when the amount of movement is greater than the first shutter speed threshold and slower than the second shutter speed threshold and the movement amount is greater than the movement amount threshold value. And when the amount of movement is less than the first shutter speed threshold and less than the second shutter speed threshold and the movement amount is less than the movement amount threshold, the camera shake correction function is used but the flash function is not used. An image sensor converting light representing an image of the subject into an electrical signal; A lens for condensing light representing the image of the subject to the image sensor; A flash unit for irradiating light onto a subject; A camera shake correction unit for preventing a shake from occurring in the captured image; And And a control unit which generates a photographed image by using the electrical signal and controls driving of the flash unit and the camera shake correction unit. The control unit is configured to acquire a shutter speed and an amount of movement with respect to an image of a subject immediately before shooting, and selectively combine and control the driving unit of the flash unit and the camera shake correction unit based on the obtained shutter speed and the amount of movement. Digital camera module. 12. The method of claim 11, The control unit, The obtained shutter speed is When the first shutter speed is lower than the threshold, the flash unit is driven, but the camera shake correction unit is controlled not to drive; When not exceeding the first shutter speed threshold value and faster than the second shutter speed threshold value, control not to drive both the flash unit and the camera shake correction unit, When the amount of movement is greater than the first shutter speed threshold and slower than the second shutter speed threshold, and the amount of movement is greater than the amount of movement threshold, the flash unit is driven but the camera shake correction unit is not driven. A digital camera module that controls the camera shake correction unit but not the flash unit when the movement amount is less than the first shutter speed threshold and less than the second shutter speed threshold and the movement amount is less than the movement amount threshold. The method of claim 11 or 12, The camera shake correction unit is a digital camera module using a digital image stabilization method for compensating for camera shake by synthesizing two or more images taken. The method of claim 13, The camera shake correction unit further uses an optical image stabilization method for correcting hand shake using images captured by applying vibration to the lens unit or the image sensor.

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