KR100777457B1 - Digital Video Camera having function for compesnation image and method for control thereof - Google Patents

Abstract

Disclosed are a photographing apparatus capable of correcting an image and a control method thereof. In the photographing apparatus including a control unit for determining whether the motion signal in the vertical and horizontal directions detected from the gyro sensor is one of a hand-induced movement and intentional movement, the control unit is a vertical and / or input in the first direction If it is determined that the motion signal in the horizontal direction is generated by intentional movement, after checking a predetermined time, it is checked whether the reverse vertical and / or reverse horizontal signal is input to the second direction, which is the reverse direction of the first direction, and then the second direction. When the reverse vertical and / or reverse horizontal signal is input, the reverse vertical and / or reverse horizontal signal is processed to be adaptively corrected. Therefore, it is possible to minimize the unnatural image by not performing the correction in the unintended direction that occurs when attempting to pan using a tripod.

DVC, Camcorder, Panning, Shaking

Description

Digital video camera having function for compesnation image and method for control

1A is a waveform diagram illustrating a signal generated when a photographer attempts to pan with a photographing apparatus;

1B is a waveform diagram illustrating a signal generated when a panning is attempted using a photographing apparatus fixed to a tripod;

2 is a block diagram showing a photographing apparatus capable of image correction according to a preferred embodiment of the present invention;

3 is a flowchart illustrating a control method of a controller for image correction of FIG. 2;

4 is a flow chart for explaining in more detail step S310 of the control method for image correction according to the present invention shown in FIG.

FIG. 5 is a flowchart for explaining step S320 of the control method for image correction according to the present invention shown in FIG. 3 in more detail;

FIG. 6 is a flowchart illustrating step S330 of the control method for image correction according to the present invention shown in FIG. 3 in more detail.

Description of the main parts of the drawing                 

200: photographing apparatus 210: vertical signal processing unit

230: horizontal signal processing unit 250: control unit

270: image processing unit

The present invention relates to a photographing apparatus capable of correcting an image and a control method thereof, and more particularly, to a photographing apparatus capable of correcting an image with respect to a backward movement occurring after an intentional movement and a control method thereof. It is about.

Digital video cameras (DVCs), which convert analog data into digital data, are being spotlighted along with digital still cameras.

In addition, as the demand and diffusion of photographing devices such as DVCs spread, the photographing devices adopt automation functions such as electronic image stabilization, auto focus, and auto exposure to improve operability. have.

Among these, the camera shake correction corrects a signal generated by the camera operator's minute camera shake operation. Image stabilization occurs almost simultaneously when the photographer intentionally moves the photographing apparatus to photograph the subject. Therefore, since the camera shakes the image quality of the photographed subject, the camera shake is preferably separated from the signal due to the intentional movement. Thereby, the photographing apparatus is provided with a function of distinguishing intentional motion from hand shake to correct a signal due to hand shake.

Panning is an example of an intentional motion signal. Panning refers to moving the photographing direction of the photographing apparatus in a horizontal direction to move the image displayed on the screen to the side.

Hand shake caused during panning can be largely prevented by fixing the photographing apparatus using a tool such as a tripod.

FIG. 1A is a waveform diagram illustrating signals generated when a photographer attempts to pan with a photographing apparatus, and FIG. 1B is a waveform diagram illustrating signals generated when attempting to pan using an imaging apparatus fixed to a tripod.

1A and 1B, the 'A' and 'C' sections are waveform diagrams of the panning signals generated when the panning is performed in the vertical or horizontal direction, and the 'B' and 'D' sections after the panning ends. A waveform diagram of a motion generated in a reverse direction (second direction) in a direction in which panning is performed (first direction), and a dotted line is a reference signal for distinguishing a panning signal and a reverse signal.

In the case of FIG. 1A, since the photographer photographed with the photographing apparatus, it can be seen that not only a signal due to panning but also a signal due to hand shaking occurred. On the other hand, in the case of FIG. 1B, since the panning is attempted after fixing the photographing apparatus to a tripod, it can be seen that the signal due to the hand shake is minutely generated.

In this case, the reverse motion signal generated in the 'B' and 'D' periods is a signal unintentionally taken by the photographer, and the photographing apparatus corrects not only the hand-shake signal but also the reverse motion signal.                         

That is, the conventional photographing apparatus as described above has a problem in that it is impossible to accurately correct an intentional motion by correcting even an unintentional backward motion signal. As a result, an image blur phenomenon occurs such that the screen is dragged in the reverse direction after panning, and thus a visually unnatural image is realized. In addition, the image blurring phenomenon has a problem of being exacerbated as the photographing apparatus is miniaturized.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an image capturing apparatus and a method of controlling the same, capable of realizing a natural image by not correcting a signal in a reverse direction generated after panning.

In order to solve the technical problem as described above, and includes a control unit for determining whether the motion signal in the vertical and horizontal directions detected from the gyro sensor according to the present invention is one of the movement of the hand shake and the intentional movement, the determination result A photographing apparatus for adaptively correcting an image according to the present invention, wherein the controller determines that a predetermined time elapses when it is determined that the motion signal in the vertical and / or horizontal directions input in the first direction is generated by the intentional movement. After checking whether the reverse vertical and / or reverse horizontal signal is input in the second direction, which is the reverse direction of the first direction, the reverse vertical signal input when the reverse vertical and / or reverse horizontal signals are input in the second direction. And / or adaptively correct the inverse horizontal signal.

More specifically, the control unit, if the motion signal for the vertical and / or horizontal direction greater than a predetermined panning determination reference signal is input for more than the panning determination reference time in the first direction, the controller is the vertical and / or horizontal It is determined that the motion signal for the direction is the intentional motion signal.

The controller may determine that the inverted vertical and / or inverted horizontal signal input in the second direction is a signal generated by the intentional motion signal after the predetermined time elapses. If it is determined that there is no motion signal in the horizontal direction by determining the presence or absence of a motion signal in the horizontal direction, it is determined that the motion on the reverse vertical signal input in the second direction is zero, and In the case of the motion signal, it is determined whether there is no motion signal in the vertical direction, and when it is determined that there is no motion signal in the vertical direction, the motion of the reverse horizontal signal input in the second direction is determined to be zero.

On the other hand, in order to solve the technical problem as described above, by determining whether the motion signal in the vertical and horizontal direction detected from the gyro sensor according to the present invention is one of the motion and the intentional motion by the hand shake operation to correct the image An image compensation control method of a photographing apparatus, comprising: (a) determining whether a motion signal in a vertical direction and / or a horizontal direction input in a first direction is an intentional motion signal; If it is determined in the step (a) that the motion signal in the vertical and / or horizontal direction is the intentional motion signal, after a predetermined time has elapsed, it is reverse vertical and / or reverse in the second direction that is the reverse direction of the first direction. (B) checking whether the horizontal signal is input; And (c) if the reverse vertical and / or reverse horizontal signals are input in the second direction in step (b), to adaptively correct the input reverse and / or reverse horizontal signals. It includes; step.

More specifically, in the step (a), when the motion signal for the vertical and / or horizontal direction larger than the preset panning reference signal is input for the panning reference time in the first direction, the vertical and / or horizontal It is determined that the motion signal for the direction is the intentional motion signal.

Further, in the step (c), if it is determined that the reverse vertical and / or reverse horizontal signals input in the second direction are signals generated by the intentional motion signal after the predetermined time elapses, In the case of the motion signal, if it is determined that there is no motion signal in the horizontal direction and determines that there is no motion signal in the horizontal direction, the motion for the reverse vertical signal input in the second direction is determined to be zero, and the horizontal In the case of the motion signal for the direction, if it is determined that there is no motion signal for the vertical direction and determines that there is no motion signal for the vertical direction, the motion for the reverse horizontal signal input in the second direction is determined to be zero. .

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

2 is a block diagram illustrating a photographing apparatus capable of image stabilization according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the image stabilization apparatus 200 according to the present invention includes a vertical signal processor 210, a horizontal signal processor 230, a controller 250, and an image processor 270.

The vertical signal processor 210 includes a vertical gyro sensor 212, a vertical low pass filter (LPF) 214, and a vertical high pass filter (HPF). 216, a first LPF 218, a first buffer 220, and a first amplifier AMP.

When the movement due to the shaking or panning occurs, the vertical gyro sensor 230 detects the movement amount of the movement in the vertical direction and converts it into a vertical frequency signal v1_out.

In addition, the vertical gyro sensor 212 outputs a vertical reference signal v1_ref output when the photographing apparatus 200 is stopped. The vertical reference signal v1_ref is a signal for balancing the vertical frequency signal v1_out up and down. When the vertical reference signal v1_ref has a value of at least 0V and at most 3V, the vertical reference signal v1_ref is 1.5V. Has a value. The same applies to the horizontal signal processor 230.

The vertical LPF 214 removes a noise signal having a frequency equal to or greater than a predetermined first frequency included in the vertical frequency signal v1_out. The vertical HPF 216 removes a noise signal having a frequency lower than or equal to a second predetermined frequency among the signals passing through the vertical LPF 214.

The signal passing through the vertical HPF 216 is a vertical frequency signal v2_out of a motion from which a noise signal is removed from the vertical frequency signal v1_out detected from the vertical gyro sensor 212. In general, signals generated by camera shake have a frequency band of 3 Hz to 15 Hz.                     

The first LPF 218 removes a noise signal having a frequency equal to or greater than a predetermined third frequency among the vertical reference signals v1_ref output from the vertical gyro sensor 212. The first buffer 220 temporarily stores the vertical reference signal v2_ref from which the noise signal is removed.

The first AMP 222 amplifies a vertical frequency signal from which the noise signals output from the vertical HPF 216 and the first buffer 220 are removed, and amplified by amplifying (v2_out) and the vertical reference signal v2_ref, respectively. v3_ref).

The horizontal signal processor 230 includes a horizontal gyro sensor 232, a horizontal LPF 234, a horizontal HPF 236, a second LPF 238, a second buffer 240, and a second AMP 242. Since the horizontal signal processor 230 is similar in configuration and operation to the vertical signal processor 210, a detailed description thereof will be omitted.

When the motion of the photographing apparatus 200 occurs, the horizontal signal processor 230 converts the horizontal motion movement amount into a horizontal frequency signal h1_out. The horizontal signal processor 230 removes the noise signals of the horizontal frequency signal h1_out and the horizontal reference signal h1_ref (h2_out and h2_ref), and then outputs the amplified signals h3_out and h3_ref.

The controller 250 controls the overall operation of the photographing apparatus 200 according to the stored control program.

Referring to the operation of the control unit 250 related to image correction, the control unit 250 is the vertical and horizontal directions for each of the vertical and horizontal frequency signals v3_out and h3_out output from the first AMP 222 and the second AMP 242. To calculate the motion data. The motion data consists of a motion angle and a motion direction value.                     

The controller 250 compares the calculated vertical and horizontal motion data with a preset noise threshold. If the calculated motion data is smaller than the noise threshold, the controller 250 determines that the motion data is noise generated by circuit elements in the photographing apparatus 200, rather than actual motion. Signals determined as noise (ie, vertical and horizontal frequency signals v3_out and h3_out) are not corrected by the control of the controller 250.

On the other hand, if the calculated vertical and horizontal motion data is larger than the noise threshold, the controller 250 determines that the motion data is caused by intentional motion due to hand shake or panning.

The controller 250 controls the correction by determining whether the calculated motion data is a motion due to hand shake or a motion due to panning.

If it is determined that the calculated motion data in the vertical and horizontal directions is a motion caused by hand shake, the image processor 270 performs correction. In addition, when it is determined that the calculated motion data in the vertical and horizontal directions is a panning motion, the image processor 270 performs centering so that an image of the motion data is located at the center of the charge coupled device.

Hereinafter, a method in which the controller 250 controls image correction on motion data in the vertical and horizontal directions will be described.

3 is a flowchart illustrating a control method of a controller for image correction of FIG. 2.

Referring to FIG. 3, the controller 250 first determines whether the motion data in the vertical and / or horizontal directions input in the first direction is a motion due to hand shake or a panning motion (S310). If it is determined in step S310 that the movement data in the vertical and / or horizontal directions is intentional movement, whether or not the reverse vertical and / or reverse horizontal data in the second direction, which is the reverse direction of the first direction, is input after a predetermined time elapses. Check (S320).

The reverse vertical data is motion data in the vertical direction input in the second direction shown in FIGS. 1A and 1B, and the reverse horizontal data is motion data in the horizontal direction input in the second direction.

When it is confirmed in step S320 that the reverse vertical and / or reverse horizontal data has been input in the second direction, the control unit 100 adaptively corrects the input reverse vertical and / or reverse horizontal data (S330).

FIG. 4 is a flowchart for explaining step S310 of the control method for image correction according to the present invention shown in FIG. 3 in more detail.

Referring to FIG. 4, the controller 250 checks whether vertical motion data larger than a preset panning reference signal is input for more than the panning reference time in the first direction (S311). When it is determined in step S311 that the panning determination reference time is input or longer, the controller 250 determines that the vertical motion data is intentional vertical motion due to panning (S312).

On the other hand, if it is determined in step S311 that the motion data in the vertical direction is not input for more than the panning determination reference time, the controller 250 determines that the motion data in the vertical direction is the motion in the vertical direction due to the shaking of the hand (S313).                     

When the determination of the motion data in the vertical direction is completed, the controller 250 confirms that horizontal motion data larger than the preset panning reference signal is input in the first direction for more than the panning reference time (S314). If it is determined in step S314 that the panning determination reference time is input or longer, the controller 250 determines that the horizontal motion data is intentional horizontal motion due to panning (S315).

On the other hand, if it is determined in step S314 that no longer than the panning determination reference time is input, the controller 250 determines that the horizontal motion data is the horizontal motion due to the shaking of the hand (S316).

FIG. 5 is a flowchart for explaining step S320 of the control method for image correction according to the present invention shown in FIG. 3 in more detail.

Referring to FIG. 5, the controller 250 checks whether the vertical motion data input in the first direction for a predetermined time is switched to the second direction opposite to the first direction (S321). That is, it is checked whether reverse vertical data is input in the second direction after a predetermined time elapses.

In step S321, when it is confirmed that the reverse vertical data is input in the second direction, the controller 250 determines whether the direction change in step S321 is a direction change by panning in the vertical direction based on the determination result in step S312 or S313. Check (S322).

According to the result of the check in step S322, the control unit 250 recognizes the direction change in step S321 as the direction change by the panning in the vertical direction (S323), or recognizes the direction change by the hand shake in the vertical direction (S324).                     

When it is determined whether the direction change for the vertical direction (steps S321 to S324), the controller 250 checks whether the direction change for the horizontal direction.

The controller 250 checks whether the horizontal motion data input in the first direction for a predetermined time is switched to the second direction opposite to the first direction (S325). In step S325, when it is confirmed that the inverse horizontal data is input in the second direction, the control unit 250 determines whether the direction change in step S325 is a direction change by panning in the vertical direction according to the determination result in step S315 or S316. Check (S326).

According to the result of the check in step S326, the controller 250 recognizes the direction change in step S325 as the direction change by the panning in the vertical direction (S327), or recognizes the direction change by the hand shake in the vertical direction (S328).

FIG. 6 is a flowchart illustrating step S330 of the control method for image correction according to the present invention shown in FIG. 3 in more detail.

Referring to FIG. 6, the controller 250 determines whether there is a movement in the horizontal direction among the movements due to panning in the vertical direction (S331). If it is determined in step S331 that there is no movement in the horizontal direction, the controller 250 determines whether the reverse vertical data generated by the vertical panning is being input in the second direction based on the recognition result of the step S323 (S332).

In step S332, when it is determined that the reverse vertical data is being input by panning in the vertical direction, the controller 250 processes the movement of the reverse vertical data to zero during the time of disappearance of the reverse vertical data input in the second direction. . That is, it is determined that there is no movement of the reverse vertical data input in the second direction so that the image processing unit 270 does not correct it.

On the other hand, if it is determined that there is a movement in the horizontal direction in step S331, the movement in the horizontal direction is determined to be caused by the hand shake to be corrected. In operation S332, when it is determined that the reverse horizontal signal generated by the hand shake is being input, the reverse horizontal signal generated by the hand shake is corrected.

When the control of correcting the inverted vertical signal in the vertical direction is completed, the controller 250 determines whether there is a movement in the vertical direction among the movements due to panning in the horizontal direction (S334). If it is determined in step S334 that there is no movement in the vertical direction, the controller 250 determines whether the reverse horizontal data generated by the horizontal panning is being input in the second direction based on the recognition result of step S327 (S335).

In operation S335, when it is determined that the reverse horizontal data is being input by panning in the horizontal direction, the controller 250 processes the movement of the reverse horizontal data input in the second direction to be zero. That is, the reverse horizontal signal input in the second direction is not corrected by the image processor 270.

On the other hand, if it is determined that the movement in the vertical direction in step S334, the movement in the vertical direction is determined to be caused by the hand shake to be corrected. In addition, when it is determined in step S335 that the reverse horizontal signal generated by the hand shake is being input, the reverse horizontal signal generated by the hand shake is corrected.

Thereby, the image correction control of the control part 250 which concerns on this invention is completed.

Photographing apparatuses used in the present invention include a DVC, a general camcorder, and the like. When photographing using a support such as a tripod, image correction can be efficiently performed without an on / off operation in the EIS mode.

That is, when attempting to pan in the horizontal or vertical direction through the photographing apparatus attached to the support, by using the characteristic that the movement in the vertical or horizontal direction rarely occurs, in the reverse horizontal or reverse vertical direction generated in an unintended direction By preventing the motion from being corrected, unnatural images can be minimized.

Although the present invention has been described in detail through the representative embodiments, those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. I will understand. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

According to the image capturing apparatus and control method thereof according to the present invention, when panning is performed by using a support such as a tripod, a natural image can be realized by not correcting a signal in the reverse direction generated after panning.

Claims (6)

In the photographing apparatus for determining whether the motion signal in the vertical and horizontal direction detected from the gyro sensor is any one of the movement of the hand shake and the intentional movement, the image pickup device for adaptively correcting the image according to the determination result, If it is determined that the motion signal with respect to the vertical and / or horizontal directions input in the first direction is generated by the intentional movement, the controller may be configured to move the signal in the second direction that is the reverse direction of the first direction after a predetermined time elapses. And checking whether a reverse vertical and / or reverse horizontal signal is input, and adaptively correcting the reverse vertical and / or reverse horizontal signals input when the reverse vertical and / or reverse horizontal signals are input in the second direction. An imaging device capable of image correction, characterized in that. The method of claim 1, The control unit may input the movement signal for the vertical and / or horizontal direction greater than a preset panning reference signal in a first direction for more than the panning determination reference time. And an image correcting apparatus, characterized in that it is determined to be the intentional motion signal. The method according to claim 1 or 2, The control unit determines that the reverse vertical and / or reverse horizontal signal input in the second direction is a signal generated by the intentional motion signal after the predetermined time elapses. If it is determined that there is no motion signal in the horizontal direction by determining the presence or absence of a motion signal in the horizontal direction, it is determined that the motion of the reverse vertical signal input in the second direction is zero, and the motion in the horizontal direction is determined. In the case of the signal, if it is determined that there is no motion signal in the vertical direction and determines that there is no motion signal in the vertical direction, the motion of the reverse horizontal signal input in the second direction is determined to be zero. Photographing device capable of image correction. In the image correction control method of the photographing apparatus for correcting the image by determining whether the motion signal in the vertical and horizontal direction detected from the gyro sensor is one of the movement by the hand shake operation and the intentional movement, (A) determining whether the motion signal in the vertical and / or horizontal directions input in the first direction is an intentional motion signal; If it is determined in the step (a) that the motion signal in the vertical and / or horizontal direction is the intentional motion signal, after a predetermined time has elapsed, it is reverse vertical and / or reverse in the second direction that is the reverse direction of the first direction. (B) checking whether the horizontal signal is input; And If it is confirmed in step (b) that the reverse vertical and / or reverse horizontal signals have been input in the second direction, processing to adaptively correct the reverse vertical and / or reverse horizontal signals inputted; Image correction control method of a photographing apparatus comprising a. The method of claim 4, wherein In the step (a), when the motion signal for the vertical and / or horizontal direction larger than the preset panning reference signal is input for the panning determination reference time or more in the first direction, the motion for the vertical and / or horizontal direction is performed. And determining that a signal is the intentional motion signal. The method according to claim 4 or 5, In step (c), if it is determined that the reverse vertical and / or reverse horizontal signal input in the second direction is a signal generated by the intentional motion signal after the predetermined time has elapsed, the motion signal in the vertical direction is determined. In the case of determining whether there is no motion signal in the horizontal direction and determining that there is no motion signal in the horizontal direction, the motion of the reverse vertical signal input in the second direction is determined to be zero, and in the horizontal direction. In the case of the motion signal, the motion signal for the vertical direction is determined to be zero when it is determined that there is no motion signal in the vertical direction and there is no motion signal in the vertical direction. The image correction control method of the photographing apparatus.

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