KR101880150B1 - Method and apparatus for generating panoramic image, panoramic x-ray imaging apparatus, computer-readable recording medium and computer program - Google Patents

Abstract

A panoramic image generation method is disclosed. The method includes the steps of acquiring a plurality of frame images by X-ray imaging of a subject tooth, reconstructing each of the acquired plurality of frame images based on an X-ray imaging angle, and combining the reconstructed plurality of frame images to generate a panoramic image And the x-ray imaging angle may be an angle between a vertical line perpendicular to the arch's arch of the tooth and an incident line corresponding to the x-ray incident on the tooth.

Description

The present invention relates to a panoramic image generating apparatus, a panoramic image generating apparatus, a panoramic radiographing apparatus, a computer-readable recording medium,

The present invention relates to a panoramic image generating method, a panoramic image generating apparatus, a panoramic radiographing apparatus, a computer readable recording medium, and a computer program, and more particularly to a panoramic image generating method, a panoramic image generating apparatus, , A computer-readable recording medium, and a computer program.

Generally, in the dentistry, an X-ray imaging apparatus is installed to perform X-ray imaging in order to treat teeth and various periodontal diseases, or to grasp the state of the teeth and alveolar bone for the purpose of correction of the teeth.

An X-ray photographing apparatus used in a dentistry transmits a predetermined amount of X-ray to a part of a body part to be photographed, detects the intensity of the transmitted X-ray, converts it into an electric signal corresponding to the X-ray intensity At this time, the computer acquires an image by obtaining the intensity of the X-ray of each point in the body imaging region and processing the X-ray intensity.

As such an X-ray photographing apparatus, an X-ray photographing apparatus for CT (computerized tomography) capable of photographing a three-dimensional stereoscopic image and a panoramic X-ray photographing apparatus capable of photographing in a two-dimensional plane are mainly used.

An X-ray radiographing device for CT is an imaging device that displays a short-sighted surface of the body which can not be represented by general photographing. The X-ray is projected on a human body while rotating at a constant angle over 360 degrees, and the transmitted X-rays are collected through a detector such as a sensor , And reconstructs the absorption value for the cross section of the human body and displays it as an image.

The panoramic x-ray photographing apparatus is a device capable of panoramic photographing so that the whole tooth state and the jaw joint can be seen at a glance by photographing the whole in the circumferential direction around the x-ray generator.

Here, the panorama image refers to an image acquired by pre-setting the trajectory of the arch to be acquired and capturing the image along the trajectory of the arch, followed by connecting the acquired image.

1 is an exemplary view showing a dental panoramic radiography method. 1, a dental panoramic X-ray photographing apparatus includes an X-ray source 12 and an image sensor 13, which are rotated by a predetermined locus around an arch locus 11 where a region of interest 14 of a subject is located, And acquires a panoramic image. The panoramic radiographing apparatus radiates an X-ray over the entire region of the arch path 11, attaches the acquired image to the panoramic radiographic image capturing device 11, .

However, since the conventional dental panoramic radiography system generates a panoramic image on the assumption that the angle formed by the x-ray entering the arch arch locus 11 and the arch locus 11 is not vertical but vertical, Distortion occurs or an out-of-focus phenomenon occurs.

If the panoramic image is severely distorted, the X-ray image must be taken again, so that the dose of the examinee also increases.

Therefore, it is necessary to study the dental panoramic image generation method to improve the quality of the panoramic image while reducing the radiation exposure of the examinee.

It is an object of the present invention to provide a panoramic image generation method for generating a panoramic image by reconstructing each of a plurality of frame images obtained by X-ray imaging of a recipient tooth on the basis of an X-ray photographing angle, A panoramic image generating device, a panoramic X-ray photographing device, a computer-readable recording medium, and a computer program. Here, the x-ray photographing angle may be an angle between a vertical line perpendicular to the arch trace of the tooth and an incident line corresponding to the x-ray incident on the tooth.

It is another object of the present invention to provide a panoramic image generating apparatus and method capable of generating a panoramic image by rearranging each of a plurality of frame images obtained by X- A panoramic image generating device, a panoramic X-ray photographing device, a computer-readable recording medium, and a computer program.

According to another aspect of the present invention, there is provided a method of generating a panoramic image by a panoramic image generation apparatus that acquires a frame image and generates a panoramic image, the panoramic image generation apparatus comprising: Acquiring a plurality of frame images corresponding to the reconstructed plurality of frame images, reconstructing each of the obtained plurality of frame images based on an X-ray photographing angle, Wherein the x-ray photographing angle may be an angle between a vertical line perpendicular to the arch of the tooth of the tooth and an incident line corresponding to the x-ray incident on the tooth.

The X-ray photographing position information indicating the position of at least one of the X-ray source part and the image sensor part during the X-ray photographing may be mapped to each of the obtained plurality of frame images.

The reconstructing may include calculating the X-ray photographing angle based on a profile defining a relationship between the X-ray photographing position information and the X-ray photographing angle.

The panoramic image generating apparatus may further include a step of receiving the oral structure information of the examinee and the panoramic image generating apparatus selecting a profile for radiographing the examinee out of a plurality of previously stored profiles based on the oral structure information of the examinee And the calculating step may calculate the X-ray photographing angle based on the selected profile.

The reconstructing may include calculating an overlap degree of frame images adjacent to each other in the plurality of frame images based on the X-ray photographing angle, and calculating the degree of overlap of the plurality of frame images based on the calculated degree of overlap, And rearranging on a plane.

The reconstructing may include calculating movement values of each of the plurality of frame images based on the X-ray photographing angle, and rearranging each of the plurality of frame images on a plane based on the calculated movement value Step < / RTI >

The movement value of each of the plurality of frames can be calculated using the trigonometric function value for the x-ray photographing angle.

According to another aspect of the present invention, there is provided an apparatus for generating a panoramic image, the apparatus comprising: a frame image acquiring unit acquiring a plurality of frame images corresponding to an X- And a panoramic image generating unit for generating a panoramic image by combining the reconstructed plurality of frame images, wherein the X-ray photographing angle is set to be perpendicular to the trajectory of the arch of the tooth And an angle between the vertical line and the incident line corresponding to the X-ray incident on the tooth.

Ray photographing position information indicating the position of at least one of the X-ray source part and the image sensor part in the X-ray photographing may be mapped to each of the obtained plurality of frame images.

The frame image reconstructing unit may further include an x-ray photographing angle calculating unit for calculating the x-ray photographing angle based on a profile defining a relationship between the x-ray photographing position information and the x-ray photographing angle.

The frame image reconstructing unit may further include a profile selecting unit for receiving the oral structure information of the examinee and selecting a profile for radiographing the examinee out of a plurality of previously stored profiles based on the oral structure information of the received examinee And the X-ray photographing angle calculating unit may calculate the X-ray photographing angle based on the selected profile.

The frame image reconstructing unit may calculate a superimposition degree of the frame images adjacent to each other in the plurality of frame images based on the X-ray photographing angle, and calculate the superimposed degrees of the plurality of frame images based on the calculated superposition degree, And a frame image rearranging unit for rearranging the frame image.

The frame image reconstructing unit may calculate a movement value of each of the plurality of frame images on the basis of the X-ray photographing angle, and determine a frame to rearrange each of the plurality of frame images on a plane based on the calculated movement value And an image rearranging unit.

The frame image rearranging unit may calculate a motion value of each of the plurality of frames using a trigonometric function value with respect to the X-ray imaging angle.

According to another aspect of the present invention, there is provided a panoramic X-ray imaging apparatus including an X-ray source for generating an X-ray, an image sensor for generating a plurality of frame images based on the X- And a panorama image generation unit for reconstructing each of the generated plurality of frame images on the basis of an X-ray photographing angle and combining the reconstructed plurality of frame images to generate a panoramic image, wherein the X- May be an angle between a vertical line perpendicular to the trajectory of the arch of the tooth and an incident line corresponding to the x-ray incident on the tooth.

The apparatus may further include a storage unit for mapping the x-ray photographing position information indicating the position of at least one of the x-ray light source unit and the image sensor unit during the x-ray photographing to each of the generated plurality of frame images.

The panorama image generation unit may calculate the x-ray photographing angle based on a profile that defines a relationship between the x-ray photographing position information and the x-ray photographing angle.

The apparatus may further include a display unit for displaying a screen for inputting the oral cavity structure information of the examinee, wherein the panoramic image generating unit generates a panoramic image based on the oral cavity structure information of the examinee, The profile can be selected, and the X-ray photographing angle can be calculated based on the selected profile.

According to another aspect of the present invention, there is provided a computer program for causing a computer to execute the method of generating a panoramic image.

According to another aspect of the present invention, there is provided a computer readable recording medium storing a computer program for performing a method of generating a panoramic image.

According to various embodiments of the present invention described above, correction values of a plurality of obtained frame images are calculated based on X-ray photographing angles, a plurality of frame images are relocated on a plane based on the calculated correction values, The quality of the dental panoramic image can be improved by connecting the frame image and creating the panoramic image.

In addition, at the same time, the number of times of re-shooting that may occur due to misalignment or out of focus of the image is reduced, and radiation exposure of the examinee due to re-shooting can be reduced.

In order to allow the X-ray to be incident perpendicularly on the arch of the arch of the tooth, it is necessary to complicatedly change the movement locus of the X-ray source and the image sensor of the X-ray photographing apparatus. To this end, do. However, according to various embodiments of the present invention, the frame image photographed in a state in which the X-ray is not incident vertically on the arch of the arch of the tooth is corrected based on the X-ray photographing angle without physical change of the X- The quality of the dental panoramic image can be improved without increasing the cost due to the addition of the physical parts.

1 is an exemplary view showing a dental panoramic photographing method.
2 is a conceptual diagram showing a panoramic X-ray photographing apparatus according to an embodiment of the present invention.
3 is a block diagram illustrating a panoramic image generation apparatus according to an exemplary embodiment of the present invention.
FIG. 4 is a block diagram specifically illustrating a panoramic image generation apparatus according to an embodiment of the present invention.
5 is a conceptual diagram showing a conventional panoramic image generating method.
6 is a conceptual diagram illustrating a panoramic image generation method according to an embodiment of the present invention.
7 is a block diagram illustrating a panoramic X-ray imaging apparatus according to an embodiment of the present invention.
8 is a flowchart illustrating a method of generating a panoramic image according to an exemplary embodiment of the present invention.
9 is a flowchart specifically illustrating a panoramic image generating method according to an embodiment of the present invention.
10 is a flowchart specifically illustrating a panoramic image generation method according to another embodiment of the present invention.

The matters relating to the operational effects including the technical structure of the above-mentioned object of the X-ray photographing apparatus and the X-ray irradiation range control method according to the present invention will be clearly understood by the following detailed description of the preferred embodiments of the present invention with reference to the drawings, .

The advantages and features of the present invention and the techniques for achieving them will be apparent from the following detailed description taken in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The present embodiments are provided so that the disclosure of the present invention is not only limited thereto, but also may enable others skilled in the art to fully understand the scope of the invention. Like reference numerals refer to like elements throughout the specification.

For simplicity and clarity of illustration, the drawings illustrate the general manner of construction and the detailed description of known features and techniques may be omitted so as to avoid unnecessarily obscuring the discussion of the described embodiments of the invention. Additionally, elements of the drawings are not necessarily drawn to scale. For example, to facilitate understanding of embodiments of the present invention, the dimensions of some of the elements in the figures may be exaggerated relative to other elements. Like reference numerals in different drawings denote like elements, and like reference numbers may indicate similar elements, although not necessarily.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a conceptual diagram showing a panoramic X-ray photographing apparatus according to an embodiment of the present invention. 2, the panoramic X-ray imaging apparatus 100 includes a base 110, a support column 120, an elevation member 130, a jaw support member 140, a rotary arm driving unit 150, a rotary arm 160, An x-ray source unit 170, an image sensor unit 180, a control unit 190, a byte block 200, and a panoramic image generation apparatus 300.

The base 110 supports the support pillars 120 on which the components are installed and the support pillars 120 are installed on one side of the base 110.

Here, the supporting column 120 is provided with the elevating member 130, and the elevating member 130 is provided with the control motor and the like, and can be displaced up and down. Therefore, the height can be appropriately adjusted in accordance with the key of the examinee 10.

The elevating member 130 is provided with an input unit 131. The user can input commands for controlling the panoramic X-ray imaging apparatus 100 through the input unit 131. [ The input unit 131 may include all or some of the user input unit and the microphone unit.

The user input unit can receive user inputs such as touch, push operation, and the like. Here, the user input unit may be implemented using at least one of various types of buttons, a touch sensor for receiving a touch input, and a proximity sensor for receiving an approaching motion. The microphone unit can receive the user's voice.

The jaw support member 140 is disposed at a position where the jaw of the examinee 10 is located and the head of the examinee 10 is positioned on the X- And the image sensor unit 180.

A support member (not shown) for supporting the rotary arm 160 is connected to the upper part of the front face of the elevating member 130 in a substantially vertical direction. The rotary arm support member (not shown) The arm 160 can be supported.

Here, the rotary arm driving unit 150 may move the rotary arm 160 in the forward direction, the backward direction, the leftward direction, and the rightward direction. In addition, the rotary arm driving unit 150 may rotate the rotary arm 160 with respect to the rotary center shaft 300.

One end of the rotary arm 160 is connected to the x-ray light source unit 170, and the other end of the rotary arm 160 is connected to the image sensor unit 180. The rotary arm 160 and the rotary arm 160 may be disposed opposite to each other. The x-ray source unit 170 and the image sensor unit 180 can be rotated about the rotation center axis 300 of the rotary arm 160 according to the rotary motion of the rotary arm driving unit 150.

Here, the X-ray source unit 170 generates an X-ray to transmit the X-ray to the examinee, and the image sensor unit 180 can convert the X-ray transmitted through the head of the examinee into an electrical signal. Here, the image sensor unit 180 may be implemented through a CCD sensor, a CMOS sensor, or the like.

The image sensor unit 180 may generate a plurality of frame images based on the electrical signals. The frame image may be a two-dimensional spatial representation of a plurality of pixel values constituting a frame image. For example, when the X-ray detection region of the image sensor unit 180 is configured to have a size of m * n, the frame image generated by the image sensor unit 180 may be composed of m pixel * n pixel arrays.

The panoramic image generation apparatus 400 may generate a panoramic image using a plurality of frame images generated by the image sensor unit 180. The panoramic image generating apparatus 400 will be described in more detail with reference to FIG.

In order to align the position of the head of the examinee, the jaw support member 140 may be provided with a bite block 200 which is inserted into the teeth of the examinee.

In addition, a collimator (not shown) may be installed on the side of the X-ray source 170 to adjust the emission range of the X-rays generated from the X-ray source 170.

3 is a block diagram illustrating a panoramic image generation apparatus according to an exemplary embodiment of the present invention. FIG. 4 is a block diagram specifically illustrating a panoramic image generation apparatus according to an embodiment of the present invention. 3 to 4, the panoramic image generation apparatus 400 may include a frame image acquisition unit 410, a frame image reconstruction unit 420, and a panorama image generation unit 430. Here, the frame image reconstructing unit 420 may include an X-ray photographing angle calculating unit 421, a profile selecting unit 422, and a frame image rearranging unit 423.

The frame image acquiring unit 410 can acquire a plurality of frame images according to X-ray imaging of the recipient teeth.

More specifically, the image sensor unit 180 of the panoramic X-ray imaging apparatus 100 generates a plurality of frame images based on the X-rays transmitted through the body of the examinee, May be stored in the storage unit 193. In this case, the frame image acquiring unit 410 may acquire a plurality of frame images generated by the image sensor unit 180 from the storage unit 193.

Here, the plurality of frame images acquired by the frame image acquiring unit 410 may be images before the frame image reconstructing unit 420 according to an embodiment of the present invention.

Also, the X-ray photographing position information may be mapped to each of the plurality of frame images acquired by the frame image acquiring unit 410. Here, the x-ray photographing position information may be information indicating the position of at least one of the x-ray light source unit 170 and the image sensor unit 180 when photographing the x-ray.

That is, when taking a panoramic X-ray of the panoramic X-ray imaging apparatus 100, the X-ray light source unit 170 and the image sensor unit 180 are disposed opposite to each other, and in the rotation arm driving unit 150, The position of the x-ray source unit 170 and the image sensor unit 180 may be changed at each photographing time during the x-ray photographing based on the rotation center axis 300. [ Therefore, according to an embodiment of the present invention, the X-ray photographing position information may be mapped to each of the plurality of frame images generated by the image sensor unit 180 and stored in the storage unit 193.

In this case, the mapping data stored in the storage unit 193 may be as shown in Table 1 below as an example.

X-ray location information Frame image First location Frame image 1 Second location Frame video 2 .. .. N-th position Frame image n

Accordingly, each of the plurality of frame images can be distinguished into a first frame image, a second frame image, ..., and an n-th frame image according to an X-ray photographing position.

However, the X-ray photographing position information is not limited to the above-described example, but may be realized by other types of information capable of distinguishing X-ray photographing positions corresponding to a plurality of frame images.

On the other hand, the frame image reconstructing unit 420 can reconstruct each of the acquired plurality of frame images based on the X-ray photographing angle. Here, the x-ray imaging angle may be an angle between a vertical line perpendicular to the arch trace of the tooth and an incident line corresponding to the x-ray incident on the tooth.

For this, the x-ray photographing angle calculating unit 421 can calculate the x-ray photographing angle based on the profile that defines the relationship between the x-ray photographing position information and the x-ray photographing angle. Here, the profile defining the relationship between the X-ray photographing position information and the X-ray photographing angle may be as shown in Table 2 below.

X-ray location information X-ray photographing angle (unit: degree) First location +5 Second location +3 .. .. N-th position -5

In this case, + and - in the unit of angles do not indicate the values but indicate the angles formed in which direction with respect to the vertical line perpendicular to the arch trace, and '+' indicates the angle with respect to the vertical line perpendicular to the arch trace, , And '-' may refer to an angle formed in the left direction with respect to a vertical line perpendicular to the arch path.

Such a profile can be implemented in such a manner that one of a plurality of profiles can be selected according to various photographing environments, oral structures of a recipient, body conditions of a recipient, input values of a user, and the like.

For example, the profile selection unit 422 can select a profile suitable for X-ray imaging of the examinee among a plurality of profiles previously stored in the storage unit 193, based on oral cavity structure information of the examinee received at the receiver information receiving unit 192 . Information on the mouth structure of the examinee is information indicating whether the oral structure is normal or protruding, information indicating whether the protruding cause is protrusion of the gum or tooth protrusion, information indicating whether the protruding area is the upper or lower teeth, Information, and the like. In this case, the profile selection unit 422 can select a profile optimal for the oral cavity structure of the examinee based on a plurality of experimental data (a profile optimal for the oral cavity structure of the examinee in consideration of exposure dose and x-ray imaging accuracy).

As another example, the display unit 194 displays a UI (User Interface) screen that enables selection among a plurality of previously stored profile lists, and when one of the plurality of profile lists is selected from the user through the displayed UI screen, The controller 422 can select a profile according to the user's selection as a profile for setting the x-ray photographing angle.

As another example, when the profile is created through the displayed UI screen, the profile selection unit 422 displays the X-ray emission range of the collimator based on the created profile Can be set. Here, the UI screen that enables creation of a profile may include a UI area capable of drawing the trajectory of the arch of the examinee, and when the user views the arch trace of the examinee and draws the trace of the arch of the examinee in the UI area, 422 can be selected as a profile for setting the X-ray photographing angle on the basis of the arch trace generated by the user.

On the other hand, the frame image rearrangement unit 423 can rearrange the plurality of frame images on the plane based on the X-ray photographing angle calculated by the X-ray photographing angle calculating unit 421. [ In this case, the frame image rearranger 423 may calculate the movement value of each of the plurality of frames or calculate the overlap degree of each of the plurality of frames using the trigonometric function value with respect to the x-ray photographing angle.

More specifically, the frame image rearrangement unit 423 calculates the superimposition degree of the frame images adjacent to each other in the plurality of frame images based on the X-ray photographing angle calculated by the X-ray photographing angle calculation unit 421 and the frame image rearrangement direction And each of the plurality of frame images can be rearranged on a plane on the basis of the calculated degree of overlap.

If the frame image rearrangement direction is the right direction, the frame image rearrangement unit 423 reduces the degree of overlap with the previous frame image as the X-ray photographing angle of the frame image increases toward the right direction, The greater the degree of overlap with the previous frame image.

If the frame image rearrangement direction is the leftward direction, the frame image rearrangement unit 423 increases the degree of overlap with the previous frame image as the X-ray photographing angle of the frame image increases in the rightward direction, The larger the left direction, the smaller the degree of overlap with the previous frame image.

For example, when the frame image rearrangement direction is the right direction, the x-ray photographing angle corresponding to the (n-1) -th frame image is 0, the x-ray photographing angle corresponding to the n-th frame image is +3, If the x-ray photographing angle corresponding to the image is +5 degrees, the superposition degree of the (n-1) -th frame image and the n-th frame image may be larger than the superposition degree of the n-th frame image and the (n + 1) -th frame image. In this case, the frame image rearranger 423 can rearrange each of the plurality of frame images on a plane on the basis of the calculated degree of overlap.

As another example, when the frame image rearrangement direction is the right direction, the x-ray photographing angle corresponding to the (n-1) -th frame image is 0 degree, the x-ray photographing angle corresponding to the n-th frame image is -3 degrees, If the X-ray photographing angle corresponding to the image is -5 degrees, the superposition degree of the (n-1) -th frame image and the n-th frame image may be smaller than the superposition degree of the n-th frame image and the (n + 1) -th frame image. In this case, the frame image rearranger 423 can rearrange each of the plurality of frame images on a plane on the basis of the calculated degree of overlap.

Alternatively, the frame image rearranging unit 423 may calculate the movement values of the plurality of frame images based on the x-ray photographing angles calculated by the x-ray photographing angle calculating unit 421, Each frame image can be rearranged on a plane. In this case, the frame image rearranging unit 423 converts the movement value based on the arrangement position of the frame image when the X-ray is incident perpendicularly to the arch trace (when the X-ray photographing angle is 0 degrees) to the X-ray photographing angle calculating unit 421 ) Based on the X-ray photographing angle and the frame image rearranging direction.

For example, when the frame image rearrangement direction is the right direction, the x-ray photographing angle corresponding to the (n-1) -th frame image is 0, the x-ray photographing angle corresponding to the n-th frame image is +3, When the x-ray photographing angle corresponding to the image is +5 degrees, the frame image rearranging unit 423 arranges the n-1-th frame image at a position where the corresponding x-ray is incident perpendicularly to the arch trace, The image is moved to the right by the first pixel on the basis of the arrangement position of the n-th frame image when the corresponding X-ray is incident perpendicularly to the trajectory of the arch, (N + 1) -th frame image in the case of vertical incidence, by the second pixel larger than the first pixel with respect to the arrangement position of the (n + 1) -th frame image.

As another example, when the frame image rearrangement direction is the right direction, the x-ray photographing angle corresponding to the (n-1) -th frame image is 0 degree, the x-ray photographing angle corresponding to the n-th frame image is -3 degrees, When the x-ray photographing angle corresponding to the image is -5 degrees, the frame image rearrangement unit 423 arranges the n-1th frame image at the position when the corresponding x-ray is incident perpendicularly to the arch trace, The image is shifted to the left by the first pixel on the basis of the arrangement position of the n-th frame image when the corresponding x-ray is incident perpendicularly on the trajectory of the arch. (N + 1) -th frame image in the case of vertically incident is shifted to the left by a second pixel larger than the first pixel with respect to the arrangement position of the (n + 1) -th frame image.

As another example, when the frame image rearrangement direction is the left direction, the x-ray photographing angle corresponding to the (n-1) -th frame image is 0 degree, the x-ray photographing angle corresponding to the n-th frame image is +3 degrees, When the x-ray photographing angle corresponding to the frame image is +5 degrees, the frame image rearrangement unit 423 arranges the n-1-th frame image at a position when the corresponding x-ray is incident perpendicularly to the eccentric locus, The frame image is moved to the right by the first pixel based on the arrangement position of the n-th frame image when the corresponding X-ray is incident perpendicularly to the trajectory of the arch, and the (n + 1) And the second pixel is shifted to the right by a second pixel larger than the first pixel with reference to the arrangement position of the (n + 1) -th frame image when the pixel is vertically incident on the pixel.

As another example, when the frame image rearrangement direction is the left direction, the x-ray photographing angle corresponding to the (n-1) -th frame image is 0, the x-ray photographing angle corresponding to the n-th frame image is -3, When the X-ray photographing angle corresponding to the frame image is -5 degrees, the frame image rearranging unit 423 arranges the n-1th frame image at a position where the corresponding X-ray is incident perpendicularly to the arch trace, The frame image is shifted to the left by the first pixel on the basis of the arrangement position of the n-th frame image when the corresponding X-ray is vertically incident on the trajectory of the arch, The first pixel is shifted to the left by a second pixel larger than the first pixel with reference to the arrangement position of the (n + 1) -th frame image when the pixel is vertically incident on the pixel.

Meanwhile, the panoramic image generating unit 430 may combine the plurality of reconstructed frame images in the frame image reconstructing unit 420 to generate a panoramic image. More specifically, the panoramic image generation unit 430 may generate a panoramic image by superimposing a plurality of frame images rearranged by the frame image rearrangement unit 423.

The panoramic image generation apparatus 400 acquires a plurality of frame images obtained by X-ray imaging of the recipient teeth, reconstructs each of the acquired plurality of frame images based on the X-ray imaging angle, Thereby creating a panoramic image. Here, the panoramic image generation apparatus 400 may be implemented using software, hardware, or a combination thereof. For example, in accordance with a hardware implementation, an application specific integrated circuit (ASIC), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs) ), Controllers, micro-controllers, microprocessors, and other units for performing other functions.

Hereinafter, a method of generating a panoramic image will be described in more detail with reference to FIGS. 5 to 6. FIG.

5 is a conceptual diagram showing a conventional panoramic image generating method. 5, the first frame image 601 is an image generated based on a first X-ray 501 incident perpendicularly to the arch of the arch, and the second frame image 602 is an image generated based on an X-ray imaging angle of '+ a1 , And the third frame image 603 is an image generated based on the third X-ray 503 having an X-ray imaging angle of '+ a2'.

5, in the conventional panoramic image generation method, when the corresponding x-rays 502 and 503 are incident vertically without reflecting the x-ray photographing angles of the second frame image 602 and the third frame image 603, The second frame image 602 and the third frame image 603 are arranged at the frame image arrangement position.

A portion 701 of the panoramic image 700 is generated by combining the first frame image 601, the second frame image 602, and the third frame image 603.

Therefore, according to the conventional panoramic image generation method, since the panoramic image is generated assuming that the angle formed by the x-ray entering the arch arch locus 11 and the arch arch locus 11 is not vertical but vertical, Distortion or out of focus occurred.

6 is a conceptual diagram illustrating a panoramic image generation method according to an embodiment of the present invention. 6, the first frame image 611-1 before rearrangement is an image generated based on the first X-ray 511 incident perpendicularly to the arch path, and the second frame image 612-1 before re- And the third frame image 613-1 before relocation is an image generated based on the second X-ray 512 having the '+ a1' at the X-ray imaging angle and the third X- (513).

6, when the frame image rearrangement direction is the right direction, the X-ray imaging angle corresponding to the first frame image 611-1 is 0 degree, and the X-ray imaging angle corresponding to the second frame image 612-1 is + a1 degrees and the X-ray imaging angle corresponding to the third frame image 613-1 is + a2 degrees, the frame image rearrangement unit 423 rearranges the first frame image 611-1 to the corresponding X- (611 - 2) at a position where the X-ray is incident vertically on the locus of the arch, and the second frame image is the second frame image (612 - 2) when the corresponding X- (612-2). The third frame image 613-1 is moved to the right by the first pixel with reference to the arrangement position of the third frame image 613-1, (613-1) is positioned on the right side of the second pixel larger than the first pixel (613-2).

The panorama image generation unit 430 combines the first frame image 601, the second frame image 602, and the third frame image 603 to generate a portion 711 of the panorama image 710 .

According to the present invention, correction values of a plurality of obtained frame images are calculated based on an X-ray photographing angle, a plurality of frame images are rearranged on a plane based on the calculated correction values, and a plurality of rearranged frame images are pasted By generating a panoramic image, the quality of the dental panoramic image can be improved. In addition, at the same time, the number of times of re-shooting that may occur due to misalignment or out of focus of the image is reduced, and radiation exposure of the examinee due to re-shooting can be reduced.

7 is a block diagram illustrating a panoramic X-ray imaging apparatus according to an embodiment of the present invention. 7, the panoramic X-ray imaging apparatus 100 includes a rotary arm driving unit 150, a rotary arm 160, an X-ray light source unit 170, an image sensor unit 180, a control unit 190, A storage unit 193, a display unit 194, and a panoramic image generation apparatus 400. The panorama image generation apparatus 400 may include a panorama image generation apparatus 400,

The examinee information receiving unit 192 can receive information on the oral structure of the examinee. Herein, the information on the mouth structure of the examinee includes information indicating whether the oral structure is normal or protruding, information indicating whether the cause of protrusion is protrusion of the gum or tooth protrusion, information indicating whether the protrusion is upper or lower, And the like. Information about the mouth structure of the examinee can be received from an external server or another apparatus through a communication module (not shown) of the X-ray imaging apparatus 100. Or information about the mouth structure of the examinee may be received via input 131 receiving user input.

The storage unit 193 stores various data and applications necessary for the operation of the panoramic X-ray imaging apparatus 100. In particular, the storage unit 193 may store data necessary for the operation of the X-ray imaging apparatus 100, for example, an OS or a UI (User Interface) screen.

In addition, the storage unit 193 may temporarily store a plurality of frame images generated by the image sensor unit 180. In this case, the storage unit 193 may store the X-ray photographing position information indicating the position of at least one of the X-ray light source unit and the image sensor unit in the X-ray photographing on each of the plurality of frame images. If a final panorama image is generated using the plurality of frame images stored in the storage unit 193, the storage unit 193 stores the generated final panorama image, and can delete the temporarily stored plurality of frame images have.

Also, the storage unit 193 may store profile data defining the relationship between the X-ray photographing position information and the X-ray photographing angle.

The storage unit 193 may be a random access memory (RAM), a flash memory, a ROM, an erasable programmable ROM (EPROM), an electronically erasable and programmable ROM (EEPROM), a register, a hard disk, Card, a Universal Subscriber Identity Module (USIM), or the like, as well as a removable storage device such as a USB memory or an external storage device such as a DB (Data Base).

The display unit 194 can output data that can be visually recognized by the user. In particular, the display unit 194 can display a UI screen for selecting a profile that defines the relationship between the X-ray photographing position information and the X-ray photographing angle. Also, the display unit 194 can display the generated final panorama image.

The display unit 194 may be formed on the front surface of the X-ray imaging apparatus 100 and exposed to the user. For example, when the input unit 131 is implemented as a touch sensor, the display unit 194 may be formed on one side of the touch sensor to display a screen upon receiving a user input.

3 to 4, the panoramic image generation apparatus 400 reconstructs each of the plurality of frame images generated by the image sensor unit 180 on the basis of the X-ray imaging angle, and reconstructs the plurality of reconstructed frame images Can be combined to generate a panoramic image.

The control unit 190 includes a rotary arm driving unit 150, a rotary arm 160, an X-ray light source unit 170, an image sensor unit 180, a control unit 190, a recipient information receiving unit 192, a storage unit 193, A display unit 194, and a panoramic image generating apparatus 400, all of which are shown in FIG.

FIG. 8 is a flowchart illustrating a method of generating a panoramic image according to an embodiment of the present invention. Referring to FIG. 8, a plurality of frame images according to X-ray imaging of a subject tooth can be obtained (S101). Here, each of the obtained plurality of frame images may be data in which x-ray photographing position information indicating the position of at least one of the x-ray source part and the image sensor part is mapped during the x-ray photographing.

Then, each of the obtained plurality of frame images can be reconstructed based on the X-ray photographing angle (S102). Here, the x-ray photographing angle may be an angle between a vertical line perpendicular to the arch trace of the tooth and an incident line corresponding to the x-ray incident on the tooth.

The reconstructed plurality of frame images may be combined to generate a panoramic image (S103).

9 is a flowchart specifically illustrating a panoramic image generating method according to an embodiment of the present invention. Referring to FIG. 11, first, a plurality of frame images according to X-ray imaging of a subject tooth can be obtained (S201).

The X-ray photographing angle of each of the plurality of frame images obtained based on the profile defining the relationship between the X-ray photographing position information and the X-ray photographing angle can be calculated (S202).

The movement values of the plurality of frame images can be calculated based on the X-ray photographing angle (S203). In this case, the movement value based on the placement position of the frame image when the X-ray is incident perpendicular to the arch path (when the X-ray imaging angle is 0 degrees) is calculated on the basis of the calculated X-ray photographing angle and the frame image relocation direction . And the magnitude of the movement value can be calculated using the trigonometric function value for the x-ray photographing angle.

Then, each of the plurality of frame images may be rearranged on a plane based on the calculated movement value (S204).

A panoramic image for generating a panoramic image may be generated by combining the plurality of reconstructed frame images (S205).

10 is a flowchart specifically illustrating a panoramic image generation method according to another embodiment of the present invention. Referring to FIG. 12, first, a plurality of frame images according to X-ray imaging of a subject tooth can be acquired (S301).

The X-ray photographing angle for each of the plurality of frame images acquired based on the profile defining the relationship between the X-ray photographing position information and the X-ray photographing angle can be calculated (S302).

Then, based on the X-ray photographing angle, the overlap degree of the frame images adjacent to each other in the plurality of frame images can be calculated (S303). Here, the overlapping degree of the frame images adjacent to each other in the plurality of frame images can be calculated on the basis of the calculated x-ray photographing angle and the frame image relocation direction.

Then, each of the plurality of frame images may be rearranged on a plane based on the calculated degree of overlap (S304).

A panoramic image for generating a panoramic image by combining the plurality of reconstructed frame images may be generated (S305).

The present invention has been described with reference to the preferred embodiments. It is to be understood that all embodiments and conditional statements disclosed herein are intended to assist the reader in understanding the principles and concepts of the present invention to those skilled in the art, It will be understood that the invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof.

Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Meanwhile, the methods according to various embodiments of the present invention described above may be implemented in the form of installed data and provided to servers or devices in a state stored in various non-transitory computer readable media. Accordingly, each device can access the server or the device in which the installation data is stored, and download the installation data.

A non-transitory readable medium is a medium that stores data for a short period of time, such as a register, cache, memory, etc., but semi-permanently stores data and is readable by the apparatus. In particular, the various applications or programs described above may be stored on non-volatile readable media such as CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM,

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

100: X-ray photographing apparatus 110: Base
120: supporting column 130: elevating member
140: jaw supporting member 150: rotary arm driving part
160: rotary arm 170: X-ray light source
180: image sensor unit 190: control unit
200: byte block 300: rotation center axis
400: panoramic image generation apparatus 410: frame image acquisition unit
420: Frame image reconstruction unit 421: X-ray photographing angle calculating unit
422: Profile selection unit 423: Frame image rearrangement unit
430: panoramic image generation unit

Claims (20)

A method for generating a panoramic image by acquiring a frame image and generating a panoramic image,
Wherein the panoramic image generation device acquires a plurality of frame images according to X-ray imaging of a subject tooth;
Reconstructing the acquired plurality of frame images based on an X-ray photographing angle; And
And combining the reconstructed plurality of frame images to generate a panoramic image,
The X-
Wherein an angle between a vertical line perpendicular to an arch of the arch of the tooth and an incident line corresponding to an X-ray incident on the tooth is calculated. The method according to claim 1,
Ray photographing position information indicating the position of at least one of the X-ray source part and the image sensor part during the X-ray photographing is mapped to each of the obtained plurality of frame images. 3. The method of claim 2,
Wherein the reconstructing comprises:
And calculating the X-ray photographing angle based on a profile defining a relationship between the X-ray photographing position information and the X-ray photographing angle. The method of claim 3,
The panoramic image generation apparatus receiving the oral cavity structure information of the examinee; And
Further comprising the step of the panoramic image generating apparatus selecting a profile for radiographing the examinee out of a plurality of profiles previously stored based on the oral cavity structure information of the examinee,
Wherein the calculating step comprises:
And the X-ray photographing angle is calculated based on the selected profile. The method of claim 3,
Wherein the reconstructing comprises:
Calculating an overlap degree of frame images adjacent to each other in the plurality of frame images based on the X-ray photographing angle; And
And rearranging each of the plurality of frame images on a plane on the basis of the calculated degree of overlap. The method of claim 3,
Wherein the reconstructing comprises:
Calculating movement values of each of the plurality of frame images based on the X-ray photographing angle; And
And rearranging each of the plurality of frame images on a plane on the basis of the calculated movement value. The method according to claim 6,
And calculating a movement value of each of the plurality of frames using a trigonometric function value with respect to the x-ray photographing angle. A panoramic image generation apparatus comprising:
A frame image acquiring unit for acquiring a plurality of frame images according to X-ray imaging of a subject tooth;
A frame image reconstructing unit reconstructing each of the obtained plurality of frame images based on an X-ray photographing angle; And
And a panorama image generation unit for combining the reconstructed plurality of frame images to generate a panorama image,
The X-
Wherein an angle between a vertical line perpendicular to an arch of the arch of the tooth and an incident line corresponding to an X-ray incident on the tooth is obtained. 9. The method of claim 8,
Ray photographing position information indicating the position of at least one of the X-ray source part and the image sensor part during the X-ray photographing is mapped to each of the obtained plurality of frame images. 10. The method of claim 9,
Wherein the frame image reconstructing unit comprises:
And an X-ray photographing angle calculating unit for calculating the X-ray photographing angle based on a profile defining a relationship between the X-ray photographing position information and the X-ray photographing angle. 11. The method of claim 10,
Wherein the frame image reconstructing unit comprises:
And a profile selection unit for receiving the oral structure information of the examinee and selecting a profile for radiographing the examinee out of a plurality of previously stored profiles based on the oral structure information of the received examinee,
The X-ray photographing angle calculating unit calculates,
And the X-ray photographing angle is calculated based on the selected profile. 11. The method of claim 10,
Wherein the frame image reconstructing unit comprises:
A frame image rearranging unit that calculates an overlapping degree of frame images adjacent to each other in the plurality of frame images based on the X-ray photographing angle, and relocates each of the plurality of frame images on a plane based on the calculated degree of overlap, And a panorama image generating unit generating a panorama image based on the panorama image. 11. The method of claim 10,
Wherein the frame image reconstructing unit comprises:
And a frame image rearrangement unit for calculating a movement value of each of the plurality of frame images based on the X-ray photographing angle and rearranging each of the plurality of frame images on a plane based on the calculated movement value Wherein the panoramic image generating apparatus comprises: 14. The method of claim 13,
Wherein the frame image rearranging unit comprises:
And calculating a movement value of each of the plurality of frames using a trigonometric function value with respect to the x-ray photographing angle. A panoramic X-ray photographing apparatus comprising:
An x-ray source generating an x-ray;
An image sensor for generating a plurality of frame images based on the X-rays transmitted through the body of the examinee; And
And a panoramic image generation unit for reconstructing each of the generated plurality of frame images based on an X-ray photographing angle and combining the reconstructed plurality of frame images to generate a panoramic image,
The X-
Wherein the angle is an angle between a vertical line perpendicular to the trajectory of the arch of the tooth of the examinee and an incident line corresponding to the X-ray incident on the tooth. 16. The method of claim 15,
And a storage unit for mapping the X-ray photographing position information indicating the position of at least one of the X-ray source unit and the image sensor unit in the X-ray photographing to each of the generated plurality of frame images, and storing the X- . 17. The method of claim 16,
Wherein the panorama image generating unit comprises:
And the X-ray photographing angle is calculated on the basis of a profile defining a relationship between the X-ray photographing position information and the X-ray photographing angle. 17. The method of claim 16,
And a display unit for displaying a screen for inputting oral structure information of the examinee,
Wherein the panorama image generating unit comprises:
Selects a profile for X-ray photographing of the examinee out of a plurality of previously stored profiles based on the oral cavity structure information of the examinee, and calculates the X-ray photographing angle based on the selected profile. A computer program stored in a computer-readable recording medium for performing the panoramic image generating method according to any one of claims 1 to 7. A computer-readable recording medium on which a computer program for performing the panorama image generating method according to any one of claims 1 to 7 is recorded.

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