KR102443611B1 - Apparatus for acquiring image data and method using the same - Google Patents

Abstract

The present invention relates to an apparatus and method for acquiring image data. The device comprises: a fixing plate on which an object is placed; a turntable rotatably installed within a rotation angle range preset with respect to the fixed plate and having a gap formed therein, the gap being formed in a circumferential direction on an upper surface of the turntable and extending from the center of the turntable by at least the rotation angle range; an arm installed on the turntable through the gap, rotatably connected along a circumferential direction of the turntable, and to which a magnetic material is attached; an RGB camera fixed to the arm and rotating along the arm to photograph an object placed on the fixed plate; a plurality of Hall sensors provided on both ends of the gap and reacting with the magnetic material to sense a rotational position of the arm; and a controller configured to control the rotational speed of the arm by controlling the rotational driving of the turntable according to the rotational position of the arm received from the hall sensor.

Description

APPARATUS FOR ACQUIRING IMAGE DATA AND METHOD USING THE SAME

The present invention relates to an image data acquisition apparatus and method for acquiring photorealistic image data for a holographic stereogram.

In general, in order to generate a hogel, which is a basic element of holographic stereogram production, a hogel is generated after extracting a multi-viewpoint image. Image data for generating a hogel may be obtained from a 3D model of a live-action object or a live-action object created through 3D scanning. In the case of the method using a 3D model, image data can be obtained through tools such as 3D Max that support script functions and various programming, but the time required for 3D model creation and ancillary post-production to obtain high-quality results are considerable. The downside is that it requires a portion.

In the case of the method of photographing a live-action object, there is a disadvantage in that it is difficult for a general user to easily access it due to the difficulty of calculating the exact position of the actual object, camera angle, and distance.

In addition, when a general user performs shooting while rotating the camera using a mechanical moving device connected to the camera, it is difficult to obtain a stable image because the camera shakes due to sudden stop of the mechanical moving device when the camera rotates forward or reverse.

On the other hand, Korean Patent Application Laid-Open No. 10-2016-0098589 discloses a technique of photographing a live-action object through a plurality of cameras using a multi-joint structure, but time-synchronizing a plurality of cameras to shoot, but a plurality of cameras must be , and each camera needs to be precisely adjusted, and time synchronization for images obtained from each camera needs to be separately performed.

Korean Patent Publication No. 10-2016-0098589

An object of the present invention is to provide an image data acquisition apparatus and method capable of photographing an object with a camera fixed to an arm, and preventing the camera from shaking when the arm is stopped from rotating.

A first aspect of the present invention for solving the above problems relates to an apparatus for acquiring image data. The device comprises: a fixing plate on which an object is placed; a turntable rotatably installed within a rotation angle range preset with respect to the fixed plate and having a gap formed therein, the gap being formed in a circumferential direction on an upper surface of the turntable and extending from the center of the turntable by at least the rotation angle range; an arm installed on the turntable through the gap, rotatably connected along a circumferential direction of the turntable, and to which a magnetic material is attached; an RGB camera fixed to the arm and rotating along the arm to photograph an object placed on the fixed plate; a plurality of Hall sensors provided on both ends of the gap and reacting with the magnetic material to sense a rotational position of the arm; and a controller configured to control the rotational speed of the arm by controlling the rotational driving of the turntable according to the rotational position of the arm received from the hall sensor.

According to an embodiment of the present invention, the angle at which the gap extends may be 120° or more.

According to an embodiment of the present invention, the rotation drive of the arm includes a plurality of rotation drive sets, each rotation drive set includes a forward rotation drive and a reverse rotation drive, and the control unit includes a turntable in each rotation drive set. In the driving of , the forward rotation and the reverse rotation may be controlled to have the same speed in the forward and reverse rotation sections of the arm arm corresponding to each other.

According to an embodiment of the present invention, the plurality of Hall sensors includes forward and reverse Hall sensor sets disposed on one side and the other side of the gap, and each Hall sensor set is spaced apart from each other for deceleration Hall sensors and for stopping Including a Hall sensor, the Hall sensor for deceleration may be further spaced apart from the Hall sensor for stopping toward the center of the gap.

According to an embodiment of the present invention, the rotation section s of the arm is a first section between the hall sensor for deceleration from the center of the rotation section s, and between the hall sensor for deceleration and the hall sensor for stopping. a second section, wherein the control unit maintains the rotational speed of the arm in the first section constant, and sets the rotational speed of the arm in the second section to a reduced speed than the rotational speed in the first section can be controlled

A second aspect of the present invention relates to a method for acquiring image data. The method includes a turntable rotatably installed within a rotation angle range preset with respect to a fixed plate on which an object is placed and provided with a gap, installed on the turntable through the gap, and rotatably connected along a circumferential direction of the turntable, a magnetic material A method of acquiring image data using an apparatus comprising an arm to which is attached, an RGB camera for photographing an object placed on the fixed plate, and a control unit for controlling a rotational speed of the arm by controlling rotational driving of the turntable, , the control unit, (a) controlling the rotational driving of the arm by rotating the turntable in a forward direction or a reverse direction; (b) controlling the RGB camera to photograph an object placed on the fixed plate while relatively rotating along the arm; and (b) controlling the rotational driving of the turntable according to the rotational position of the arm received from the hall sensor to adjust the rotational speed of the arm.

According to an embodiment of the present invention, the rotational driving of the arm is performed by a plurality of rotational driving sets, each rotational driving set including a forward rotational driving and a reverse rotational driving, and the step (a) includes each of the rotational driving sets. In the driving of the arm in a rotation driving set, the forward rotation and the reverse rotation are controlled to have the same speed in the forward and reverse rotation driving of the arm corresponding to each other, and in driving the arm between different rotation driving sets, the The rotation speed of the arm can be adjusted individually.

According to the present invention, a general user can easily acquire a multi-viewpoint image by photographing an object with a camera fixed to an arm.

In addition, it is possible to obtain a stable image by preventing the camera from shaking when the turntable on which the object is placed is stopped. That is, it is possible to prevent a low-level hologram from being generated due to the position of the RGB camera being changed due to an abrupt stop.

1 is a configuration diagram schematically showing each configuration of an image data acquisition apparatus according to the present invention.
2 is a perspective view illustrating an apparatus for acquiring image data according to the present invention.
3 is a plan view illustrating the image data acquisition device of FIG. 2 .
4 is a plan view showing the configuration of the magnetic body and the Hall sensor of the arm in the image data acquisition apparatus of FIG. 2 .
FIG. 5 is a diagram illustrating a configuration for controlling rotation of an arm by a controller of the image data acquisition apparatus of FIG. 2 .
FIG. 6 is a diagram exemplarily illustrating an image sequence captured by the image data acquisition apparatus of FIG. 2 .

Hereinafter, detailed contents for practicing the present invention will be described with reference to the accompanying drawings. In the description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured as it is obvious to those skilled in the art with respect to related known functions, the detailed description thereof will be omitted.

The image data acquisition apparatus according to the present invention may be used to directly acquire image data of a live-action object in a multi-view image generation process for implementing a half-parallax holographic stereogram. However, the present invention is not limited thereto and may be used for any purpose in the related field.

1 is a configuration diagram schematically showing each configuration of an image data acquisition apparatus according to the present invention. 2 is a perspective view illustrating an apparatus for acquiring image data according to the present invention. 3 is a plan view illustrating the image data acquisition device of FIG. 2 .

1 to 3 , the image data acquisition apparatus according to the present invention includes a fixed plate 1 , a turntable 10 , an arm 20 , an RGB camera 30 , a hall sensor 40 , and a control unit 50 . , and an image acquisition unit 60 .

A fixing plate 1 on which an object is placed is provided, and the turntable 10 is relatively rotatably installed on the fixing plate 1 . The turntable 10 may be formed to have a predetermined height in the form of a circular table. The object to be photographed is placed in the center of the upper surface of the fixing plate 1 . The turntable 10 is rotatably installed within a preset rotation angle range with respect to the fixed plate 1 , and an air gap 11 is formed. The gap 11 is formed in the circumferential direction on the upper surface of the turntable 10 in the form of a groove having a depth and extends from the center of the turntable 10 by at least the rotation angle range. The air gap 11 is formed close to the circumference of the turntable 10 . The angle at which the gap 11 extends may be set to 120° or more.

The arm 20 is installed on the turntable 10 through the gap 11 and is rotatably connected along the circumferential direction of the turntable 11 . The arm 20 is formed in the shape of a rod extending in the longitudinal direction. The arm 20 is connected to the turntable 10 by being inserted into the void 11 at the end of the 'L' shape. One end of the arm 20 is bent perpendicular to the longitudinal direction of the arm 20 so that it can be inserted into the air gap 11, and the other end of the arm 20 is an RGB camera 30 can be mounted. provided so that

A motor 12 (see FIG. 5 ) for controlling the rotation of the turntable 10 is installed in the turntable 10 , and the motor 12 is provided as, for example, a 1/2hp motor. As the turntable 10 rotates, the arm 20 relatively rotates in the forward or reverse direction with respect to the fixed plate 1 along the air gap 11 . Accordingly, the arm 20 rotates within the rotation section (s). One end of the arm 20 inserted into the gap 11 rotates in the forward or reverse direction along the gap 11 . However, it is not limited to a configuration for rotating the turntable 10 , and a configuration for directly rotating the arm 20 by a motor is also possible.

4 is a plan view showing the configuration of the magnetic body and the Hall sensor of the arm in the image data acquisition apparatus of FIG. 2 .

Referring to FIG. 4 , a magnetic body 70 is attached to the arm 20 . The magnetic body 70 is disposed close to the side of the gap 11 in the longitudinal direction of the arm 20 . The magnetic material may be formed of a neodymium magnet that forms a strong magnetic force.

The RGB camera 30 is fixed to the arm 20 and rotates along the arm 20 to photograph an object placed on the fixing plate 1 . One end of the arm 20 is inserted into the cavity 11 , and the RGB camera 30 is fixed to the other end of the arm 20 and oriented toward the object. The RGB camera 30 is fixed to the arm 20 and rotates within a preset rotation angle range in the forward and reverse directions to capture an image of the object. The RGB camera 30 may photograph an object at a set number of frames per second (fps), for example, at 120 fps per second. Shooting of the RGB camera 40 may be controlled by the controller 50 . The plurality of images captured by the RGB camera 30 are provided to the image acquisition unit 60 to be generated in the form of an image sequence.

A plurality of Hall sensors 40 are provided on both ends of the air gap 11 and react with the magnetic body 70 to detect the rotational position of the arm 20 . The Hall sensor 40 includes a basic configuration of a known Hall sensor. The hall sensor 40 may be installed toward the outer circumferential surface of the turntable 10 inside the gap 11 , and may sense the position of the magnetic body 70 by receiving a magnetic force formed by the magnetic body 70 .

The plurality of Hall sensors 40 include forward and reverse Hall sensor sets disposed on one side and the other side of the gap. Each hall sensor set includes a hall sensor 41 for deceleration and a hall sensor 42 for stop which are spaced apart from each other. The hall sensor 41 for deceleration is further spaced apart from the hall sensor 41 for stopping toward the center of the air gap 11 .

The hall sensor 41 for deceleration is a sensor for measuring the rotational position of the arm 20 at a point where deceleration is required in order to set the degree of deceleration of the arm 20 through the motor 12 . That is, when the intensity of the magnetic material sensed by the hall sensor 41 for deceleration corresponds to a preset value, the controller 50 may reduce the rotation speed of the arm 20 . The stop hall sensor 42 is a sensor for stopping the rotation of the arm 20 or changing the rotation direction. For example, when the rotational position of the arm 20 is set to the initial position, when the intensity of the magnetic material sensed by the stationary Hall sensor 42 corresponds to a preset value, the control unit 50 controls the rotation of the arm 20 . can be stopped Thereafter, the control unit 50 may change the rotation direction of the arm 20 from the forward direction to the reverse direction, or from the reverse direction to the forward direction, or change the vertical and vertical height values of the arm 20 , and then repeatedly drive it. To this end, a height adjuster (not shown) for changing the vertical vertical height value may be connected to the arm 20 .

The hall sensor 41 for deceleration includes a hall sensor 41a for forward deceleration and a hall sensor 41b for deceleration in the reverse direction. The stop Hall sensor 42 includes a forward stop Hall sensor 42a and a reverse stop Hall sensor 42b.

The Hall sensor 41a for forward deceleration and the Hall sensor 42a for forward stop are disposed on one end side of the air gap 11, and the Hall sensor 41b for reverse deceleration and the Hall sensor 42b for reverse stop are provided in the air gap 11 is placed on the other end side of the Specifically, the hall sensor for forward deceleration (41a) and the hall sensor for forward stop (42a) are disposed on one end side of the rotation section (s), and the hall sensor for reverse deceleration (41b) and the hall sensor for reverse stop (42b) is disposed on the other end side of the rotation section (s).

FIG. 5 is a diagram illustrating a configuration for controlling rotation of an arm by a controller of the image data acquisition apparatus of FIG. 2 .

Referring to FIG. 5 , the control unit 50 may control the rotational driving of the turntable 10 according to the rotational position of the arm 20 received from the hall sensor 40 to control the rotational speed of the arm 20 . . The rotation of the arm 20 may be performed a plurality of times in the forward or reverse direction. The control unit 50 is connected to the control box 51 , and the user can adjust the rotation direction and rotation speed of the arm 20 through the control unit 50 by pressing each adjustment button in the control box 51 .

The rotational drive of the arm 20 includes a plurality of rotational drive sets, each rotational drive set including a forward rotational drive and a reverse rotational drive. That is, in one rotational drive set, reverse rotational driving may be performed after forward rotational driving, or, conversely, forward rotational driving may be performed after reverse rotational driving.

In driving the turntable 10 in each rotation drive set, the control unit 50 may control the forward rotation and the reverse rotation to have the same speed in the forward and reverse rotation sections of the arm 20 corresponding to each other. For example, when the rotational drive set includes a first rotational drive set and a second rotational drive set, in the first rotational drive set, the forward rotational speed and the reverse rotational speed in an arbitrarily determined first section are the same, and different In the second section, the forward rotation speed and the reverse rotation speed are controlled to be the same.

The controller 50 may individually adjust the rotational speed of the arm 20 in driving the turntable 10 between different rotational driving sets. For example, the rotational speed of the arm 20 in the first rotational drive set and the second rotational drive set may be adjusted to be different from each other.

FIG. 6 is a diagram exemplarily illustrating an image sequence captured by the image data acquisition apparatus of FIG. 2 .

Referring to FIG. 6 , the number of image sequences is determined according to the rotation speed of the arm 20 designated by the user. This is proportional to the left and right views of the finally output holographic stereo view. The rotation speed can be set in steps. For example, the rotation speed may be divided into five steps, and the rotation speed and the number of images acquired are inversely proportional. When the RGB camera 30 shoots at 120 fps per second, about 120 to 1200 images may be acquired by adjusting the rotation speed.

The rotation section s of the arm 20 includes a first section s1 between the hall sensor 41 for deceleration from the center of the rotation section s, and the hall sensor 41 for deceleration and the hall sensor 42 for stopping. and a second section s2 between them. The control unit 50 may maintain a constant rotation speed of the arm 20 in the first section, and control the rotation speed of the arm 20 in the second section to a reduced speed than the rotation speed in the first section. .

Accordingly, it is possible to obtain a stable image by preventing the shaking of the RGB camera 30 when the arm 20 stops rotating. That is, it is possible to prevent a low-level hologram from being generated because the position of the RGB camera 30 is changed due to an abrupt stop.

The image acquisition unit 60 may receive a plurality of images captured at a set number of frames per second (fps) from the RGB camera 30 to form an image sequence. On the other hand, the image acquisition unit 60 extracts a smaller number of images in the second section (s2) than in the first section (s1) among the plurality of provided images, and the extracted images are displayed in the first and second sections ( In s1 and s2), it is possible to form an image sequence arranged at equal intervals.

The image data acquisition method according to the present invention includes an arm rotation step (s10), a photographing step (s20), and an arm speed adjustment step (s30). The image data acquisition apparatus according to the above-described embodiments is used in the image acquisition step, and is performed by the controller 50 .

The arm rotation step s10 is a step of controlling the rotational driving of the arm 20 by rotating the turntable 10 in a forward or reverse direction. The photographing step (s20) is a step of controlling the RGB camera 30 to photograph an object placed on the fixed plate 1 while relatively rotating along the arm 20 . The arm speed adjusting step (s30) is a step of controlling the rotational driving of the turntable 10 according to the rotational position of the arm 20 received from the hall sensor 40 to adjust the rotational speed of the arm 20 .

The control unit 50 performs rotational driving of the arm 20 in a plurality of rotational driving sets, wherein each rotational driving set includes a forward rotational driving and a reverse rotational driving. In the arm rotation step (s10), in the driving of the arm 20 in each rotation drive set, the control unit 50 controls the forward rotation and the reverse rotation at the same speed in the forward and reverse rotation driving of the arm 20 corresponding to each other. Control to be the same, and in the driving of the arm 20 between the different rotation drive sets, the rotation speed of the arm 20 can be adjusted individually.

The scope of protection in this field is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

10: Table 11: Gap
12: motor 20: arm
30: RGB camera 40: Hall sensor
41: deceleration sensor 41a: forward deceleration sensor
41b: reverse deceleration sensor 42: stop sensor
42a: forward stop sensor 42b: reverse stop sensor
50: control unit 60: image acquisition unit
s: rotation section s1: first section
s2: second section

Claims (7)

fixed plate on which the object rests;
a turntable rotatably installed within a rotation angle range preset with respect to the fixed plate and having a gap formed therein, the gap being formed in a circumferential direction on an upper surface of the turntable and extending from the center of the turntable by at least the rotation angle range;
an arm installed on the turntable through the gap, rotatably connected along a circumferential direction of the turntable, and to which a magnetic material is attached;
an RGB camera fixed to the arm and rotating along the arm to photograph an object placed on the fixed plate;
a plurality of Hall sensors provided on both ends of the gap and reacting with the magnetic material to sense a rotational position of the arm; and
a control unit for controlling the rotational driving of the turntable according to the rotational position of the arm received from the hall sensor to control the rotational speed of the arm;
The plurality of Hall sensors includes forward and reverse Hall sensor sets disposed on one side and the other side of the gap, and each of the Hall sensor sets includes a hall sensor for deceleration and a hall sensor for stop disposed spaced apart from each other,
The hall sensor for deceleration is characterized in that it is further spaced apart from the hall sensor for stopping toward the center of the air gap, image data acquisition device.
According to claim 1,
An image data acquisition device, characterized in that the angle at which the gap extends is 120° or more.
According to claim 1,
The rotational drive of the arm includes a plurality of rotational drive sets, each rotational drive set including a forward rotational drive and a reverse rotational drive;
In the driving of the turntable in each rotation drive set, the control unit controls the forward rotation and the reverse rotation to have the same speed in the forward and reverse rotation sections of the arm arm corresponding to each other,
An apparatus for acquiring image data, characterized in that in driving a turntable between different sets of rotational drives, the rotational speed of the arm is individually adjusted.
delete According to claim 1,
The rotation section of the arm includes a first section between the hall sensor for deceleration from the center of the rotation section, and a second section between the hall sensor for deceleration and the hall sensor for stopping,
The control unit maintains the rotational speed of the arm in the first section constant, and controls the rotational speed of the arm in the second section to a reduced speed than the rotational speed in the first section, Image data acquisition device. delete delete

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