JP2016119724A - Dynamic image photographing device, dynamic image shaking correction method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct shaking in a case where large shaking is generated in a photographed dynamic image, and to obtain a dynamic image having continuity.SOLUTION: A dynamic image photographing device comprises: shaking correction means for cutting out a partial image having predetermined size from an image of each frame included in photographed dynamic image data, and adjusting a position of each cutout partial image on the basis of a detected shaking amount to correct shaking of the dynamic image data; and control means for performing control of changing the predetermined size on the basis of the detected shaking amount. For a first frame section where a shaking amount of a first threshold or more is detected, the control means performs first control of determining the predetermined size on the basis of the shaking amount detected corresponding to the frame in the same first frame section. For a second frame section adjacent to the first frame section, the control means performs second control different from the first control.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a moving image photographing apparatus, a moving image fluctuation correcting method, and a program.

  In a photographing device such as a digital camera, a video camera, and a mobile camera with a moving image shooting function, a part of an image acquired from an image sensor is cut out at the time of moving image shooting, and the direction of camera shake for detecting the position of the cut out image Some have an electronic camera shake correction function that corrects camera shake by adjusting the amount. This electronic camera shake correction function needs to provide a margin area of a size corresponding to the amount of camera shake that can be corrected around the effective pixel area of the image sensor, but it is corrected in order to ensure that the recorded image area is as large as possible. The amount of possible camera shake is limited. For this reason, it is generally impossible to correct large fluctuations in the entire screen that occur when the apparatus main body itself operates greatly or when the hand holding the apparatus main body is moved greatly.

  Also, the act of searching for a subject often performed by a photographer when he / she loses sight of the subject moves the screen tremendously in a short period of time, so it cannot be corrected by the image stabilization function during shooting, and as a result, the user can view the image during playback. Was uncomfortable and wasted. In addition, in this type of conventional apparatus, even when a large fluctuation occurs in which the fluctuation of the image cannot be corrected with a preset clipping size, a large size can be obtained by dynamically reducing the clipping size. A technique that enables correction of shaking is disclosed (see, for example, Patent Document 1).

JP 2007-300581 A

  However, in the above-described conventional device, when a large change (shake) occurs in the captured moving image and the cutout size is reduced, an enlargement process is performed to match the size of the cutout image in this state with the size of the image of another frame. However, there is a possibility that the continuity of the moving image may be lost due to a rapid change in the enlargement ratio according to the change in the cutout size.

  The present invention has been made to solve the above-described problems, and can obtain a continuous moving image that can correct the shaking even when the captured moving image is greatly shaken. It is an object of the present invention to provide a moving image photographing apparatus, a moving image fluctuation correcting method, and a program that make it possible.

  In order to solve the above problems, a moving image imaging apparatus according to a first aspect of the present invention detects an amount of shaking of each frame included in moving image data picked up by an image pickup unit that picks up a moving image and the moving image data. A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means and the detection means, and the amount of shaking detected by the detection means as to the position of each cut out partial image And a control unit for executing control for changing the predetermined size according to the amount of shaking detected by the detecting unit. The shake correcting means adjusts the predetermined size under the control of the control means so as to match the sizes of the plurality of partial images cut out at the predetermined size. In response to the change, each partial image cut out at the predetermined size is enlarged or reduced, and the control means is the same for the first frame section in which the detection means detects a fluctuation amount equal to or greater than a first threshold. A first control for determining the predetermined size according to the amount of shaking detected by the detection means corresponding to a frame in the first frame section is executed, and a second adjacent to the first frame section is performed. For the frame section, the first control for determining the predetermined size according to the amount of shaking detected by the detection means corresponding to a frame in the first frame section instead of the same second frame section; Are characterized by executing different second controls.

  A moving image shake correction method according to a second aspect of the present invention is a moving image shake correction method for performing shake correction of moving image data captured by an imaging unit, and is included in the moving image data captured by the imaging unit. A first step of detecting the amount of shaking of each frame, and cutting out a partial image of a predetermined size from within the image of each frame included in the moving image data captured by the imaging means, and A second step for correcting the shaking of the moving image data by adjusting the position according to the shaking amount detected by the first step, and the predetermined size according to the shaking amount detected by the first step. A third step of executing control to change, wherein the second step matches the sizes of the plurality of partial images cut out at the predetermined size. As described above, each partial image cut out at the predetermined size is enlarged or reduced according to the change in the predetermined size by the control of the third step, and the third step is equal to or more than a first threshold value by the first step. For the first frame section in which the amount of shaking is detected, the first size is determined in accordance with the amount of shaking detected in the first step corresponding to the frame in the same first frame section. The second frame interval adjacent to the first frame interval is detected by the first step not corresponding to the same second frame interval but corresponding to a frame in the first frame interval. The second control different from the first control for determining the predetermined size according to the amount of shaking is performed.

  A moving image shake correction program according to a third aspect of the present invention includes a detecting unit that is executed by a computer of a moving image capturing device and detects a shake amount of each frame included in moving image data captured by an image capturing unit. A moving image shake correction program for a moving image capturing apparatus, wherein a computer cuts out a partial image of a predetermined size from the image of each frame included in the moving image data captured by the imaging unit, and each of the cut out portions A shake correction process for correcting the shake of the moving image data by adjusting the position of the image according to the shake amount detected by the detection means, and the predetermined size according to the shake amount detected by the detection means. A control process for executing a control to be changed, and the shake correction process includes a plurality of pieces cut out at the predetermined size. The partial images cut out at the predetermined size are enlarged or reduced in accordance with the change in the predetermined size by the control of the control process so that the sizes of the divided images are matched. For the first frame section in which the amount of swing equal to or greater than the threshold value is detected, the predetermined size is determined according to the amount of swing detected by the detecting means corresponding to the frame in the same first frame section. 1 is executed, and the second frame section adjacent to the first frame section is detected by the detecting means in correspondence with the frame in the first frame section, not the same second frame section. A second control different from the first control for determining the predetermined size in accordance with the amount of shaking performed is performed.

  According to the present invention, a moving image shooting apparatus and a moving image shake that can correct the shake and obtain a continuous moving image even when the taken moving image has a large shake. A correction method and a program can be provided.

It is a block diagram which shows the structure of the digital camera by 1st Embodiment of this invention. It is a block diagram which shows the structure of the control part of the digital camera by 1st Embodiment of this invention. It is a conceptual diagram which shows the shake correction process of the digital camera by 1st Embodiment of this invention. It is a flowchart which shows the shake correction process at the time of the moving image reproduction of the digital camera by 1st Embodiment of this invention. It is a flowchart which shows the shake correction process at the time of the moving image photography of the digital camera by 2nd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as this embodiment) will be described in detail with reference to the accompanying drawings. Note that the same numbers are assigned to the same elements throughout the description of the present embodiment. Note that the same numbers are assigned to the same elements throughout the description of the present embodiment. This embodiment is applied not only to a digital camera but also to a video camera, a mobile phone device with a moving image shooting function, and the like.

(First embodiment)
(Configuration of the first embodiment)
FIG. 1 is a block diagram showing a configuration of a digital camera 1 according to an embodiment of the present invention. In FIG. 1, the image acquisition unit 10 includes a lens 11, a shutter 12, and an LPF 13. The lens 11 is a normal optical lens and includes a lens group in which aspherical lenses are stacked. The shutter 12 is a so-called mechanical shutter that is operated by a driver 14 driven by the control unit 20 when a shutter button is operated. Depending on the digital camera, a mechanical shutter may not be provided. In the case of a model equipped with a retractable lens structure and a mechanical zoom, these drivers are also controlled by the driver 14. The LPF 13 is a crystal low-pass filter and is mounted to prevent the occurrence of moire.

  Next, the analog signal processing unit 15 includes an image sensor (CCD, CMOS) 16, a sampling / signal amplification processing unit 17, and an A / D converter 18. The imaging sensor 16 forms a subject image (image), and converts the intensity of light of each color of RGB into a current value. The sampling / signal amplification processing unit 17 performs correlated double sampling processing and signal amplification processing for suppressing noise and color unevenness. The A / D converter 18 is also called an analog front end, and converts the sampled / amplified analog signal into a digital signal (converts each color of RGB and CMYG into 12-bit data and outputs it to the bus line).

Next, the control unit (CPU) 20 controls the entire digital camera 1 (imaging device) according to a program stored in a program memory described later. In the present embodiment, the control unit 20 includes a shake amount detection unit 210 and a shake correction unit 220 as shown in FIG.
For example, the shake amount detection unit 210 detects the shake amount of each frame included in the moving image data at a stage before reproducing the captured moving image data stored in the image memory 31 described later. The shake correction unit 220 cuts out a partial image of a predetermined size from the image of each frame included in the moving image data picked up by the image pickup means, and the shake amount detection unit 210 detects the position of each cut out partial image. By adjusting according to the amount of shaking, the shaking of the moving image data is corrected. The control unit 20 executes control to change the predetermined size according to the amount of shaking detected by the shaking amount detection unit 210.
Further, the shake correction unit 220 enlarges or reduces each partial image cut out at the predetermined size according to a change in the predetermined size under the control of the correction unit 20 so that the sizes of the plurality of partial images cut out at the predetermined size are matched. To do.
For the first frame section in which the shaking amount equal to or greater than the first threshold is detected by the shaking amount detection unit 210, the control unit 20 uses the shaking amount detection unit 210 corresponding to the frame in the same first frame section. A first control for determining a predetermined size according to the detected amount of shaking is executed. Further, the control unit 20, for the second frame section adjacent to the first frame section, does not correspond to the same second frame section but corresponds to the frame in the first frame section, and the shaking amount detection unit 210. The second control different from the first control for determining the predetermined size according to the amount of shaking detected by the above is executed. Furthermore, the control unit 20 does not use a size corresponding to the amount of shaking detected by the amount of shaking detection unit 210 for the third frame section in which the amount of shaking less than the first threshold is detected, but a predetermined fixed amount. A third control different from both the first control and the second control for determining the size as the predetermined size is executed.

  The preview engine 22 is stored in the image buffer 26 immediately after detection of digital data input via the image acquisition unit 10 and the analog signal processing unit 15 in the recording mode (also referred to as recording mode or photographing mode) or shutter operation detection. Thinning processing is performed in order to display the digital data and the digital data stored in the image memory 31 on the display unit 25. The D / A converter 23 converts the digital data thinned out by the preview engine 22 and outputs it to the driver 24 at the subsequent stage.

  The driver 24 includes a buffer area for temporarily storing digital data displayed on the display unit 25 at the subsequent stage, and drives the display unit 25 based on a control signal input via the key operation unit 27 and the control unit 20. The display unit 25 includes a color TFT liquid crystal, an STN liquid crystal, or the like, and displays a preview image, image data after shooting, a setting menu, and the like.

  The image buffer 26 temporarily stores digital data immediately after photographing until it is input via the analog signal processing unit 15 or the digital signal processing unit 28 and passed to the digital signal processing unit 28. The key operation unit 27 includes a shutter button, a recording / playback mode selection slide switch, a menu button, a cross key (determined by pressing the center), and the like.

  The digital signal processing unit 28 performs white balance processing, color processing, gradation processing, contour emphasis, conversion from RGB format to YUV format, YUV format for digital data input via the analog signal processing unit 15. To JPEG format. The image compression / decompression processing unit 29 compresses and encodes the digital data input via the digital signal processing unit 28 into the JPEG format, generates a motion JPEG format movie file, or converts the motion JPEG format movie file to MPEG. It is converted into a moving image file in a format, or in a reproduction mode, a moving image file in JPEG format, motion JPEG format, or MPEG format is expanded.

  The program memory 30 stores various programs loaded in the control unit 20, EV values in the best shot function, color correction information, and the like. The image memory 31 stores image data temporarily stored in the image buffer 26, digital data converted into various file formats, moving image data, and the like. The card I / F 32 controls data exchange between the external recording medium 33 and the digital camera body.

  The external recording medium 33 is a detachable recording medium composed of a compact flash (registered trademark), a memory stick, an SD card, or the like. The external connection I / F 34 includes a USB connector slot and the like, is connected to a personal computer or the like, and is used for transferring photographed image data. The RAM 35 stores various parameters necessary for control of the control unit (CPU) 20, various parameters at the time of night scene shooting (gain (ISO sensitivity), aperture, shutter speed, threshold for image composition, weight, etc.), and the like. .

(Operation of the first embodiment)
The operation of the digital camera 1 according to the present embodiment shown in FIG. 1 will be described in detail below with reference to FIGS. First, an outline of the moving image fluctuation correction of the present embodiment will be described with reference to the conceptual diagram shown in FIG. FIG. 3A shows a time chart showing the amount of shaking of each frame included in the moving image data to be corrected. Note that the shake amount of the correction target moving image data is detected by, for example, a shake amount detection unit 210 (see FIG. 2) described later. That is, the shaking amount detection unit 210 is detected by comprehensively considering the movement amount of the main subject in a certain frame section of the moving image data, the movement amount of a building or a mountain in the background, and the like. FIG. 3B shows a time chart of the cut-out margin size at the time of shake correction of the moving image data shown in FIG. FIG. 3A illustrates frame images G <b> 1 to G <b> 7 before being cut out at the timing of the starting point of the lead line by drawing a lead line on the time chart. FIG. 3C shows a time chart of the digital zoom magnification at the time of shake correction of the moving image data shown in FIG. FIG. 3C illustrates images G <b> 21 to G <b> 27 that are drawn at the timing of the starting point of the lead line by drawing a lead line on the time chart.

  In FIG. 3A, moving image data to be corrected (for example, moving image data stored in the image memory 31) is compared with a first threshold value and a second threshold value, which are shake amounts set in advance as threshold values. Is done. Here, the first threshold is, for example, a state in which the subject (baseball batter in this example) is in the center as in the frame image G1, and the state in which the subject has moved to the right end of the frame as in the frame image G4. Is a value corresponding to the amount of vibration that can be specified to be a certain amount of vibration (however, smaller than a second threshold value described later). Further, the second threshold value is a value corresponding to a shake amount that can specify a shake that causes the subject to move out of the frame as in the frame image G6 from the imaging state of the frame image G1, for example.

  When the first threshold value and the second threshold value described above are set, a frame section (for example, a frame section before the time t0) in which a fluctuation less than the first threshold value is detected in the moving image data to be corrected is specified. Then, regardless of the amount of shaking of the frame section (for convenience, the third frame section in accordance with the claims), the image around the subject is cut out from each frame at a fixed size, and the size is kept as it is. Shake correction is performed only by adjusting the position. As an example, in FIG. 3, in the frame period before time t0, for example, a frame image G1 that does not shake and a frame image G2 that slightly shakes to the right are both cut out as images G21 and G22 of the same size. The vibration is corrected through position adjustment. This shake correction process is a commonly performed process.

  Further, a frame (a frame between time t1 and t2) in which a fluctuation greater than or equal to the first threshold and less than the second threshold is detected in moving image data to be corrected (see FIG. 3A). In order to perform the shake correction of the frame section (referred to as the first frame section for convenience), for example, an image near the subject that has been swung to the right end in the frame image G4 is the first frame section (time t1). (Section t2) and a size corresponding to the amount of shaking (see FIG. 3B), and the cut-out image is enlarged to, for example, three times the cut-out size (see FIG. 3 (see (C)), the position is adjusted and the shake is corrected. Further, in the present embodiment, when the first frame section in which a swing amount that is greater than or equal to the first threshold and less than the second threshold is identified, the control unit 20 determines the swing amount of the first frame section. In response, a process of changing the length of the frame period before and after the first frame period (between times t0 and t1 and between times t2 and t3) is performed. Then, the control unit 20 includes, for example, an image cut out from the current frame as it approaches the first frame section in both the previous and subsequent frame sections (for convenience, referred to as the second frame section) whose length has been changed. So that the size (maximum, size of the first frame section) gradually increases, in other words, the size (minimum, size of the third frame section) gradually decreases as the distance from the first frame section increases. Control for changing the predetermined size is executed as second control. By this process, in the second frame section from time t0 to time t1, the image cut out from each frame is gradually adjusted to a large size from 1 to 3 times (in this example, cut out from the frame image G3). Then, the control unit 20 adjusts the image cut out from each frame to three times the size in the first frame section from the time t1 to the time t2. Further, in the second frame section from time t2 to time t2, the image cut out from each frame is gradually adjusted to a small size from 3 times to 2 times. As a result, the size of the cut-out image changes gradually from time t0 to time t3, and continuity is maintained.

  In addition, when a frame section (a section between times t4 and t5) in which a shaking amount greater than or equal to the second threshold is detected is specified, in the frame section (referred to as a fourth frame section for convenience), for example, a frame image Since the subject is shifted so that it is out of the frame as in G6, the shake correction cannot be performed by cutting out the region of the subject and adjusting the size. In this case, instead of performing the shake correction by the shake correction unit 220, the control unit 20 discards each frame in the fourth frame section, and the frame image G5 of the previous frame section or the rear frame A frame interpolation process is performed in which an image is cut out from the frame image G7 of the frame section, and the cut-out image G26 is embedded and interpolated as the image of the cut out frame section with the same magnification (1 ×). According to this frame interpolation processing, it is possible to avoid useless reproduction of an image without a subject and to avoid unnatural reproduction.

  Based on the schematic description of the shake correction based on FIG. 3, the shake correction processing operation according to the present embodiment will be described in detail below. FIG. 4 is a flowchart showing the correction processing operation during moving image reproduction according to the present embodiment. When the user sets the moving image playback mode in the key operation unit 27 of the digital camera 1 (see FIG. 1), selects a moving image to be played, and performs a playback start operation, the control unit 20 performs the selected moving image. Data is read from the image memory 31 and temporarily stored in the image buffer 26. Thereafter, the control unit 20 uses the shake amount detection unit 210 and the shake correction unit 220 to process the reproduction image data stored in the image buffer 26 until the moving image data is reproduced in step S112 in FIG. Execute shake correction processing. Note that, when performing the shake correction process, a first threshold value and a second threshold value for determining the magnitude of the shake amount are set in advance. Here, the first threshold value and the second threshold value are illustrated in FIG. Note that the first threshold value is a value corresponding to a shake amount that cannot be corrected by a normal shake correction process (see step S103) in which a fixed-size image is cut out from each frame and the position of the cut-out image is adjusted. It is. The second threshold value is larger than the first threshold value. For example, when the photographer loses sight of the subject and tries to find it, the image is greatly disturbed for a moment, or the photographer's finger touches unintentionally. Or a value corresponding to shaking when an image unrelated to a series of images is suddenly shot.

  When the shake correction process is started, the shake amount detection unit 210 reads moving image data to be reproduced from the image buffer 26 and sequentially reads out the target frame of interest for detecting the shake amount. The amount of shaking of each frame of interest is calculated by image comparison with a plurality of frames (step S101).

  The shake correction unit 220 monitors the shake amount calculated (detected) by the shake amount detection unit 210 and checks whether or not there is a frame period in which a shake amount less than a preset first threshold is detected (step). S102). Here, when there is no frame period in which the amount of fluctuation less than the first threshold is detected (NO in step S102), the control unit 20 proceeds to step S104. On the other hand, when there is a frame period in which the amount of fluctuation less than the first threshold is detected (YES in step S102), each frame within the frame period has a fixed margin size determined in advance. The image is cut out, and the position is adjusted to other frames (step S103). This shake correction process is a process normally applied to a moving image with small shake.

  Next, the shake correction unit 220 checks whether there is a frame period in which the shake amount detected (calculated) by the shake amount detection unit 210 is greater than or equal to the first threshold and less than the second threshold (step S104). Here, when there is no frame period in which the amount of fluctuation greater than or equal to the first threshold and less than the second threshold is detected (NO in step S104), the process proceeds to step S110 described later. On the other hand, when there is a frame period in which a fluctuation amount that is greater than or equal to the first threshold value and less than the second threshold value is detected (YES in step S104), the control unit 20 is based on the fluctuation amount of each frame within the frame period. The cut margin size is determined (step S105). Next, for each frame in the frame period, the control unit 20 detects that the amount of shaking is greater than or equal to the first threshold value and less than the second threshold value in step S105, and determines the clipping determined according to the amount of shaking of the frame period. The image is cut out with the margin size, and the position and size of the image are adjusted to other frames (by balancing the position and size of the images of other frames) (step S106).

  Furthermore, the control unit 20 detects the maximum amount of shaking within the frame period, and sets the length of a predetermined period provided before and after the frame period based on the detected maximum amount of shaking (step S107). The control unit 20 sets the cut margin size to gradually change within the set predetermined period (step S108). In addition, the control unit 20 cuts out each image with a gradually changing cutting margin size for each frame within the predetermined period set in step S108, and adjusts the position and size in accordance with other frames (step S109). ).

  As described above, after the shake correction (steps S105 to S109) in the frame period in which the shake amount greater than or equal to the first threshold value and less than the second threshold value is performed, the shake amount detected in step S101 is the first shake amount. It is checked whether or not there is a frame period equal to or greater than two thresholds (step S110). Here, if it is determined that there is a frame period in which the amount of shaking greater than or equal to the second threshold is detected (YES in step S110), the controller 20 determines each amount within the frame period in which the amount of shaking is greater than or equal to the second threshold. A process of interpolating the discarded frame image based on the previous and subsequent frame images is performed (step S111).

  As described above, the shake amount less than the first threshold, the shake amount greater than the first threshold value and less than the second threshold value, and the shake amount greater than the second threshold value have been corrected (steps S103, S105 to S109, S111). The shake correction image data in the image buffer 26 is sent to the driver 24. The driver 24 temporarily stores the sent data in the buffer area, reads out the moving image data after shake correction from the buffer area, and displays it on the display unit 25 as a reproduced moving image (step S112). The image data whose shake has been corrected by the shake correction processing up to step S111 is returned (stored) to the image memory 31, and then the moving image data after the shake correction is directly read from the image memory 31 and reproduced. Anyway.

(Effect of 1st Embodiment)
As described above, according to the moving image photographing apparatus (digital camera 1) according to the present embodiment, the control means (swing correction unit 220) is the detection means (see steps S104 to S109) as shown in FIG. The first frame section in which the amount of shaking greater than or equal to the first threshold and less than the second threshold is detected by the shaking amount detection unit 210) is specified, and the first frame section and the first frame section before and after the first frame section are identified. For the two frame sections, the image is cut out from the frames of the first and second frame sections to a size corresponding to the amount of shaking detected for the first frame section by the detecting means, and A first shake correction process for adjusting the position and size in accordance with other frames is performed. In this way, not only the frame that detected a large shake, but also the frames before and after that, the frame that detected the large shake was cut out small, and then the shake was corrected by enlarging it at a large magnification. The problem of losing the continuity of a moving image due to a sudden change in the enlargement ratio according to the change in the cut size in a frame section in which a large shake is corrected, which was remarkable in the conventional apparatus (see the first cited document) to be performed Can be avoided.

According to the present invention, the effects listed below can be obtained.
(1) A natural reproduced image is obtained by interpolating the frame with an image cut out from an adjacent frame where the subject exists, for a large shake so that the subject disappears from the frame for a moment and the subject is captured thereafter. Can see.
(2) The length of the second frame section is changed according to the shake amount of the first frame section, and a natural reproduced image whose size changes gradually can be viewed.
(3) The shake correction according to the present embodiment can be applied when reproducing a captured moving image or when capturing a moving image. By correcting the shake at the time of shooting and storing it in the image memory, the process of correcting the shake at the time of reproduction becomes unnecessary.
(4) It is also possible to correct a shake that causes the image to move slowly in the opposite direction after the image slowly moves to one side, and cannot be corrected in real time during normal shooting.

(Modification 1 of the first embodiment)
In the first embodiment, in the first frame section, an example is given in which an image is cut out with a trimming margin size based on the swing amount of the first frame section detected by the swing amount detection unit 210. At the time of moving image reproduction, the user may arbitrarily set the cut margin size (reduction level: blur correction level). With regard to this configuration, for example, after setting the moving image generation mode, before the reproduction start operation (before moving to step S101), a setting screen is displayed on the display unit 25, and the setting instruction is made using the setting screen. It can be realized by receiving. According to such a configuration, the user can arbitrarily set the size variation when correcting the shaking in the section where the shaking amount is large.

(Modification 2 of the first embodiment)
In addition, in the setting screen shown in the first modification of the second embodiment, whether or not to perform shake correction on a moving image with a large shake (a shake corresponding to the first threshold value) is used as a waste image (above It may be possible to set whether or not to perform shake correction for an image having a shake corresponding to the second threshold. Note that the processing for setting whether or not to perform these corrections can be configured to be performed when a moving image is captured. According to such a configuration, the user can arbitrarily set the type of shake to be corrected.

(Second Embodiment)
(Configuration of Second Embodiment)
In the above-described first embodiment, an example in which the shake correction process is performed when a moving image is reproduced has been disclosed. However, in the second embodiment, the shake correction process is performed when a moving image is captured. When shake correction is performed at the time of capturing a moving image, the correction target is simply changed from the captured moving image data described in the above embodiment to the moving image data being captured, and the configuration of the control unit 20 is the same as that of the moving image data. The shake correction processing can be handled by the configuration shown in FIG. Other configurations of the digital camera 1 according to the present embodiment are the same as those in FIG.

(Operation of Second Embodiment)
FIG. 5 is a flowchart showing the shake correction processing operation during moving image shooting according to the present embodiment. Hereinafter, the shake correction processing of the present embodiment will be described with reference to FIG. In order to shoot a moving image, a shooting start operation is performed after the moving image shooting mode is set. When a shooting start operation is performed, the photoelectric conversion output of the moving image captured by the image sensor 16 is sampled and amplified by the sampling / signal amplification processing unit 17 and further digitally converted by the A / D converter 18 to obtain a bus. Output to the line. In the present embodiment, the control unit 20 temporarily stores the digital signal (moving image data) output from the A / D converter 18 in the image buffer 26 before storing it in the image memory 31, and stores the stored moving image data. Then, the shake correction process shown in FIG. 5 is performed. In performing this correction processing, it is assumed that the first threshold value and the second threshold value are set in advance as in the first embodiment.

  In this embodiment, when the shake correction process is started, the shake amount detection unit 210 transmits the moving image data (moving image data being shot) before being transferred from the image buffer 26 to the image memory 31 via the digital signal processing unit 28 and the like. ) And sequentially reading out the target frame of interest for detecting the amount of shaking, and calculating the amount of shaking of each frame of interest by comparing the target frame with the preceding and succeeding frames (step S201). Thereafter, the shake correction unit 220 monitors the shake amount calculated (detected) by the shake amount detection unit 210, and is a frame period in which a shake amount less than a preset first threshold value is detected. The frame period in which the amount of fluctuation less than 2 threshold values is detected and the frame period in which the amount of fluctuation more than the second threshold value is specified are specified, and the shake correction processing in steps S202 to S211 is performed for the frames in these sections. To do. Here, the processing of steps S202 to S211 is the same as the processing of steps S102 to S111 in the first embodiment (see FIG. 4), and detailed description thereof is omitted. In step S211 in FIG. 5, after the image interpolation process is performed for the frame period in which the amount of shaking greater than or equal to the second threshold is detected, digital processing is performed based on the moving image data after the shaking correction (size, position, etc. adjustment). The shake corrected moving image data is generated through digital signal processing in the signal processing unit 28, and the shake corrected moving image data is stored in the image memory 31 (step S212).

(Effect of 2nd Embodiment)
As described above, according to the moving image capturing apparatus (digital camera 1) according to the second embodiment, when capturing a moving image, the captured moving image data is buffered before being stored in the image memory 31, and shake correction is performed. Do. Even if a moving image with a large shake is shot during shooting, the corrected moving image can be stored in the image memory, and when the moving image data is played back, the image without a large shake is reproduced without performing the shake correction process. it can.

(Third embodiment)
(Configuration of Third Embodiment)
In the first embodiment and the second embodiment described above, the amount of shaking of each frame is detected from the moving image data to be shake-corrected during the playback or shooting of the moving image. In the third embodiment, A detector such as an acceleration / gyro sensor that detects the amount of vibration (vibration) of the main body of the apparatus is associated with the amount of vibration detected by the detector for each frame in the moving image data captured by the imaging means. Association means for storing. Then, when reproducing the moving image data associated with the shaking amount, the shaking amount detection unit 210 of the control unit 20 reads the shaking amount of each frame associated with the moving image data, and each of the image data The amount of shaking of the frame is detected. After that, the shake correction unit 220 detects, based on the read shake amount, for example, a frame period in which a shake amount less than the first threshold is detected, and a shake amount that is greater than or equal to the first threshold and less than the second threshold. The shake correction process is performed by specifying the frame period and the frame period in which the shake amount equal to or greater than the second threshold is detected.

(Effect of the third embodiment)
Thus, in the third embodiment, the amount of shaking detected by the detector that detects the amount of shaking of the main unit of the apparatus (digital camera 1) is associated with the moving image data captured by the imaging means (imaging sensor 16). The detection means (the shake amount detection unit 210) detects the shake amount of the moving image data to be corrected based on the shake amount (of the apparatus main body) associated with the moving image data. According to the configuration of the present embodiment, it is possible to reproduce an image in which a large shake is corrected using a shake detection sensor such as a gyro sensor.

  Note that the moving image fluctuation correction method according to the present embodiment is applied to, for example, the digital camera 1 shown in FIG. The moving image shake correction method is, for example, the first step (step S101 in FIG. 4) for detecting the shake amount of moving image data picked up by the image pickup means (image pickup sensor 16) of the digital camera 1 in FIG. ) And a first frame section in which a swing amount greater than or equal to a predetermined first threshold and less than a predetermined second threshold is detected in the first step, the first frame section and the first frame are identified For the second frame section before and after the section, the image is cut out from the frames of the first and second frame sections to a size corresponding to the shaking amount detected for the first frame section by the first step. And a second step (steps S104 to S109 in FIG. 4) for performing a shake correction process for adjusting the position and size of the cut image according to other frames.As described above, the shake correction is performed not only on the frame in which the large shake is detected, but also on the frames before and after the frame. For this reason, there is a video recording method that enables continuous video viewing without sudden change in the magnification of the image cut out for correction even when the captured video is greatly shaken. Can be provided.

  In addition, the moving image shake correction program according to the present embodiment is a program that is installed in, for example, the program memory 30 of the digital camera 1 and is executed by a computer (for example, the control unit 20 in FIG. 1). Then, the program causes the computer to detect a shake amount of the moving image data imaged by the imaging means (imaging sensor 16) of the digital camera 1 (step S101 in FIG. 4), and to perform a predetermined first by the detection process. A first frame section in which a fluctuation amount greater than or equal to a threshold value and less than a predetermined second threshold value is identified, and the first frame section and second frame sections before and after the first frame section are targeted. The image is cut out from the frames of the first and second frame sections to a size corresponding to the shaking amount detected for the first frame section by the detection process, and the position and size of the cut out image are changed to other frames. The shake correction process (steps S104 to S109 in FIG. 4) to be adjusted together is executed. In the digital camera 1, the control unit 10 (the shake amount detection 210 and the shake correction unit 220) reads the above program, and the first frame section in which the shake amount that is greater than or equal to the first threshold and less than the second threshold is detected. And the second frame section before and after the image, the image is cut out from each frame to a size corresponding to the amount of shaking detected for the first frame section, and the position and size of the cut-out image are set to other frames. Execute shake correction processing that adjusts to As a result, a video shooting program that enables continuous video viewing without sudden change in the enlargement ratio of the image cut out for correction even when the captured video is greatly shaken. Can be provided.

  As mentioned above, although preferred embodiment of this invention was explained in full detail, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

The claims appended at the time of filing this application will be appended below.
[Claim 1]
An imaging means for capturing a moving image;
Detecting means for detecting a shaking amount of each frame included in the moving image data imaged by the imaging means;
A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means, and the position of the cut out partial image is adjusted according to the amount of shaking detected by the detection means. A shake correcting means for correcting the shake of the moving image data by
Control means for executing control to change the predetermined size according to the amount of shaking detected by the detection means;
Comprising
The shake correcting means is
In accordance with the change in the predetermined size under the control of the control means, the partial images cut out at the predetermined size are enlarged or reduced so as to match the sizes of the partial images cut out at the predetermined size,
The control means includes
For the first frame section in which the amount of shaking greater than or equal to the first threshold is detected by the detection means, the first frame section corresponds to the amount of shaking detected by the detection means corresponding to a frame in the same first frame section. A first control for determining a predetermined size is executed, and a second frame section adjacent to the first frame section corresponds to a frame in the first frame section, not the same second frame section. And a second control different from the first control for determining the predetermined size in accordance with the amount of shaking detected by the detecting means.
[Claim 2]
The control means includes
For the third frame section in which the amount of shaking less than the first threshold is detected, a predetermined fixed size is determined as the predetermined size, not the size corresponding to the amount of shaking detected by the detecting means. The moving image capturing apparatus according to claim 1, wherein a third control different from any of the first control and the second control is executed.
[Claim 3]
The control means includes
The moving image photographing apparatus according to claim 1 or 2, wherein a length of the second frame section is changed in accordance with the amount of shaking detected for the first frame section.
[Claim 4]
The control means includes
For the second frame section, control is performed as the second control so that the predetermined size gradually increases as it approaches the first frame section and gradually decreases as it moves away. The moving image photographing apparatus according to claim 3.
[Claim 5]
The frame section in which the amount of fluctuation greater than the first threshold and less than the second threshold is detected by the detection means is the first frame section, and the frame section in which the amount of fluctuation greater than the second threshold is detected. 4 frame intervals,
In the fourth frame section, instead of performing the shake correction by the shake correction means, the frame interpolating means for discarding each frame in the fourth frame section and interpolating with an image of an adjacent frame is further provided. 5. The moving image photographing apparatus according to claim 1, wherein the moving image photographing apparatus is characterized in that:
[Claim 6]
A detector for detecting the amount of shaking of the device body,
Association means for associating and storing the amount of shaking detected by the detector with the moving image data imaged by the imaging means;
6. The moving image shooting according to claim 1, wherein the detecting unit detects a shaking amount of the moving image data based on the shaking amount associated with the moving image data by the associating unit. apparatus.
[Claim 7]
The shake correcting means is
Performing the shake correction process on the moving image data stored in the storage unit;
The control means includes
When the shake correction unit performs the shake correction process on the moving image data stored in the storage unit, control is performed to change the predetermined size according to the shake amount detected by the detection unit. The moving image shooting apparatus according to claim 1, wherein the moving image shooting apparatus is a moving image shooting apparatus.
[Claim 8]
The shake correcting means is
8. The moving image photographing apparatus according to claim 7, wherein the shake correction process is performed when reproducing the entire moving image data stored in the storage unit.
[Claim 9]
The shake correcting means is
8. The moving image shooting apparatus according to claim 7, wherein the shake correction process is performed on the moving image data temporarily stored before being stored in the storage unit during image pickup by the image pickup unit.
[Claim 10]
A moving image shake correction method for performing shake correction of moving image data captured by an imaging means,
A first step of detecting a shaking amount of each frame included in the moving image data imaged by the imaging means;
A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means, and the position of each cut out partial image is determined according to the amount of shaking detected in the first step. A second step of correcting shaking of the moving image data by adjusting;
A third step of executing control to change the predetermined size in accordance with the amount of shaking detected in the first step;
Have
The second step includes
In accordance with the change in the predetermined size by the control of the third step, each partial image cut out at the predetermined size is enlarged or reduced so as to match the sizes of the plurality of partial images cut out at the predetermined size,
The third step includes
For the first frame section in which the swing amount equal to or greater than the first threshold is detected in the first step, the first frame section corresponds to the swing amount detected in the first step corresponding to the frame in the same first frame section. The first control for determining the predetermined size is executed, and the second frame section adjacent to the first frame section is not the same second frame section but a frame in the first frame section. Correspondingly, a second control different from the first control for determining the predetermined size in accordance with the amount of shaking detected in the first step is executed.
[Claim 11]
A moving image shake correction program for a moving image shooting apparatus provided with a detecting unit that is executed by a computer of the moving image shooting device and detects a shake amount of each frame included in moving image data captured by an imaging unit,
On the computer,
A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means, and the position of the cut out partial image is adjusted according to the amount of shaking detected by the detection means. A shake correction process for correcting the shake of the moving image data,
A control process for executing a control for changing the predetermined size in accordance with the amount of shaking detected by the detection means;
The shake correction process includes:
In accordance with the change in the predetermined size under the control of the control means, the partial images cut out at the predetermined size are enlarged or reduced so as to match the sizes of the partial images cut out at the predetermined size,
The control process is
For the first frame section in which the amount of shaking greater than or equal to the first threshold is detected by the detection means, the first frame section corresponds to the amount of shaking detected by the detection means corresponding to a frame in the same first frame section. A first control for determining a predetermined size is executed, and a second frame section adjacent to the first frame section corresponds to a frame in the first frame section, not the same second frame section. And a second control different from the first control for determining the predetermined size in accordance with the amount of shaking detected by the detecting means.

  DESCRIPTION OF SYMBOLS 1 ... Digital camera, 10 ... Image acquisition part, 15 ... Analog signal processing part, 16 ... Imaging sensor, 17 ... Sampling / signal amplification processing part, 18 ... A / D converter, 20 ... Control part, 210 ... Swing amount detection part , 220: Shake correction unit, 22: Preview engine, 23: D / A converter, 24 ... Driver, 25 ... Display unit, 26 ... Image buffer, 27 ... Key operation unit, 28 ... Digital signal processing unit, 29 ... Image compression / Decompression processing unit, 30 ... Program memory, 31 ... Image memory, 32 ... Card I / F, 33 ... External recording medium, 34 ... I / F for external connection, 35 ... RAM

In order to solve the above problems, a moving image imaging apparatus according to a first aspect of the present invention detects an amount of shaking of each frame included in moving image data picked up by an image pickup unit that picks up a moving image and the moving image data. A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means and the detection means, and the amount of shaking detected by the detection means as to the position of each cut out partial image And a control unit for executing control for changing the predetermined size according to the amount of shaking detected by the detecting unit. The shake correcting means adjusts the predetermined size under the control of the control means so as to match the sizes of the plurality of partial images cut out at the predetermined size. In response to the change, each partial image cut out at the predetermined size is enlarged or reduced, and the control means is the same for the first frame section in which the detection means detects a fluctuation amount equal to or greater than a first threshold. A first control for determining the predetermined size according to the amount of shaking detected by the detection means corresponding to a frame in the first frame section is executed, and a second adjacent to the first frame section is performed. For the frame section, a second control is performed in which a predetermined size is determined in accordance with the amount of shaking detected by the detecting means corresponding to the frame in the first frame section .

A moving image shake correction method according to a second aspect of the present invention is a moving image shake correction method for performing shake correction of moving image data captured by an imaging unit, and is included in the moving image data captured by the imaging unit. A first step of detecting the amount of shaking of each frame, and cutting out a partial image of a predetermined size from within the image of each frame included in the moving image data captured by the imaging means, and A second step for correcting the shaking of the moving image data by adjusting the position according to the shaking amount detected by the first step, and the predetermined size according to the shaking amount detected by the first step. A third step of executing control to change, wherein the second step matches the sizes of the plurality of partial images cut out at the predetermined size. As described above, each partial image cut out at the predetermined size is enlarged or reduced according to the change in the predetermined size by the control of the third step, and the third step is equal to or more than a first threshold value by the first step. For the first frame section in which the amount of shaking is detected, the first size is determined in accordance with the amount of shaking detected in the first step corresponding to the frame in the same first frame section. Control is executed, and for the second frame section adjacent to the first frame section, the second control is executed to determine the predetermined size according to the amount of shaking detected by the first step. Features.

A moving image shake correction program according to a third aspect of the present invention includes a detecting unit that is executed by a computer of a moving image capturing device and detects a shake amount of each frame included in moving image data captured by an image capturing unit. A moving image shake correction program for a moving image photographing apparatus, wherein a computer cuts out a partial image of a predetermined size from the image of each frame included in the moving image data captured by the imaging unit, and each of the cut out portions A shake correction process for correcting the shake of the moving image data by adjusting the position of the image according to the shake amount detected by the detection means, and the predetermined size according to the shake amount detected by the detection means. A control process for executing a control to be changed, and the shake correction process includes a plurality of pieces cut out at the predetermined size. In order to match the size of the partial image, each partial image cut out at the predetermined size is enlarged or reduced in accordance with the change in the predetermined size by the control of the control process. For the first frame section in which the amount of swing equal to or greater than the threshold value is detected, the predetermined size is determined according to the amount of swing detected by the detecting means corresponding to the frame in the same first frame section. The second frame section adjacent to the first frame section is executed according to the amount of shaking detected by the detecting means corresponding to the frame in the first frame section. The second control for determining the predetermined size is performed.

Claims (11)

An imaging means for capturing a moving image;
Detecting means for detecting a shaking amount of each frame included in the moving image data imaged by the imaging means;
A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means, and the position of each cut-out partial image is adjusted according to the amount of shaking detected by the detection means. A shake correcting means for correcting the shake of the moving image data by
Control means for executing control to change the predetermined size according to the amount of shaking detected by the detection means;
Comprising
The shake correcting means is
In accordance with the change in the predetermined size under the control of the control means, the partial images cut out at the predetermined size are enlarged or reduced so as to match the sizes of the partial images cut out at the predetermined size,
The control means includes
For the first frame section in which the amount of shaking greater than or equal to the first threshold is detected by the detection means, the first frame section corresponds to the amount of shaking detected by the detection means corresponding to a frame in the same first frame section. A first control for determining a predetermined size is executed, and a second frame section adjacent to the first frame section corresponds to a frame in the first frame section, not the same second frame section. And a second control different from the first control for determining the predetermined size in accordance with the amount of shaking detected by the detecting means. The control means includes
For the third frame section in which the amount of shaking less than the first threshold is detected, a predetermined fixed size is determined as the predetermined size, not the size corresponding to the amount of shaking detected by the detecting means. The moving image capturing apparatus according to claim 1, wherein a third control different from any of the first control and the second control is executed. The control means includes
The moving image photographing apparatus according to claim 1 or 2, wherein a length of the second frame section is changed in accordance with the amount of shaking detected for the first frame section. The control means includes
For the second frame section, control is performed as the second control so that the predetermined size gradually increases as it approaches the first frame section and gradually decreases as it moves away. The moving image photographing apparatus according to claim 3. The frame section in which the amount of fluctuation greater than the first threshold and less than the second threshold is detected by the detection means is the first frame section, and the frame section in which the amount of fluctuation greater than the second threshold is detected. 4 frame intervals,
In the fourth frame section, instead of performing the shake correction by the shake correction means, the frame interpolating means for discarding each frame in the fourth frame section and interpolating with an image of an adjacent frame is further provided. 5. The moving image photographing apparatus according to claim 1, wherein the moving image photographing apparatus is characterized in that: A detector for detecting the amount of shaking of the device body,
Association means for associating and storing the amount of shaking detected by the detector with the moving image data imaged by the imaging means;
6. The moving image shooting according to claim 1, wherein the detecting unit detects a shaking amount of the moving image data based on the shaking amount associated with the moving image data by the associating unit. apparatus. The shake correcting means is
Performing the shake correction process on the moving image data stored in the storage unit;
The control means includes
When the shake correction unit performs the shake correction process on the moving image data stored in the storage unit, control is performed to change the predetermined size according to the shake amount detected by the detection unit. The moving image shooting apparatus according to claim 1, wherein the moving image shooting apparatus is a moving image shooting apparatus. The shake correcting means is
8. The moving image photographing apparatus according to claim 7, wherein the shake correction process is performed when reproducing the entire moving image data stored in the storage unit. The shake correcting means is
8. The moving image shooting apparatus according to claim 7, wherein the shake correction process is performed on the moving image data temporarily stored before being stored in the storage unit during image pickup by the image pickup unit. A moving image shake correction method for performing shake correction of moving image data captured by an imaging means,
A first step of detecting a shaking amount of each frame included in the moving image data imaged by the imaging means;
A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means, and the position of each cut out partial image is determined according to the amount of shaking detected in the first step. A second step of correcting shaking of the moving image data by adjusting;
A third step of executing control to change the predetermined size in accordance with the amount of shaking detected in the first step;
Have
The second step includes
In accordance with the change in the predetermined size by the control of the third step, each partial image cut out at the predetermined size is enlarged or reduced so as to match the sizes of the plurality of partial images cut out at the predetermined size,
The third step includes
For the first frame section in which the swing amount equal to or greater than the first threshold is detected in the first step, the first frame section corresponds to the swing amount detected in the first step corresponding to the frame in the same first frame section. The first control for determining the predetermined size is executed, and the second frame section adjacent to the first frame section is not the same second frame section but a frame in the first frame section. Correspondingly, a second control different from the first control for determining the predetermined size in accordance with the amount of shaking detected in the first step is executed. A moving image shake correction program for a moving image shooting apparatus provided with a detecting unit that is executed by a computer of the moving image shooting device and detects a shake amount of each frame included in moving image data captured by an imaging unit,
On the computer,
A partial image of a predetermined size is cut out from the image of each frame included in the moving image data picked up by the image pickup means, and the position of each cut-out partial image is adjusted according to the amount of shaking detected by the detection means. A shake correction process for correcting the shake of the moving image data,
A control process for executing a control for changing the predetermined size in accordance with the amount of shaking detected by the detection means;
The shake correction process includes:
Enlarging or reducing each partial image cut at the predetermined size according to the change in the predetermined size by the control of the control process so as to match the size of the plurality of partial images cut at the predetermined size,
The control process is
For the first frame section in which the amount of shaking greater than or equal to the first threshold is detected by the detection means, the first frame section corresponds to the amount of shaking detected by the detection means corresponding to a frame in the same first frame section. A first control for determining a predetermined size is executed, and a second frame section adjacent to the first frame section corresponds to a frame in the first frame section, not the same second frame section. And a second control different from the first control for determining the predetermined size in accordance with the amount of shaking detected by the detecting means.

Images