Method and device for changing image magnification

Abstract

The present specification discloses an image capturing method, which is an image capturing method performed by an image capturing device, comprising: a step of obtaining information on the current position of a sensor and a generator, i.e., a first position; a step of moving the sensor and the generator to a second position, wherein the second position is a position for obtaining an image having a different magnification from the image of the photographed object obtained when the sensor and the generator are located at the first position; and a step of obtaining an image of the photographed object, wherein the sensor and the generator are moved the same distance to prevent the interval distance between the sensor and the generator from changing.

Description

Technical Field

[0001] The present specification relates to a method and a device for photographing an image by changing the image magnification, and more particularly, to a method and a device for photographing an image by changing the magnification of an X-ray photographing device according to a photographing object. Background Art

[0002] X-ray imaging devices, which are widely used in the field of medical technology, irradiate the human body with X-rays and obtain images of the inside of the human body, thereby detecting abnormalities inside the human body.

[0003] The principle of an X-ray imaging device is to irradiate an object with X-rays generated by a generator that generates X-rays, and receive X-rays that have penetrated a part of the object or reached without penetrating the object through a sensor facing the generator. The received X-rays are then converted into electrical signals to generate images.

[0004] Recently, a technology related to an X-ray imaging device that can be used for panoramic imaging or CT imaging as needed has been disclosed. Prior art 1 discloses a technology that performs two functions of panoramic imaging and CT imaging using one device (Korea Patent Publication No. 10-2007-0017670). According to this prior art, a technology is disclosed that a sensor for panoramic imaging and a sensor for CT imaging are used separately, and the sensors are detached to change the imaging mode as needed.

[0005] However, according to these technologies, there is the inconvenience of disassembling the sensor every time the panoramic or CT shooting mode is switched, and there is also the problem that in order to obtain an enlarged image of a specific area, additional subsequent processing is required after the image is shot.

[0006] Moreover, prior document 2 (Korean Patent Publication No. 10-2016-0056986) proposed rotating the sensor and generator of the X-ray imaging device or moving it in the length direction to perform multiple modes of imaging. However, the size and magnification of the area of ​​interest to be photographed for the actual object of imaging were not specifically considered. Within the limited size range of the sensor, it is difficult to use one sensor to reflect multiple modes without considering the active area. Summary of the invention

[0007] Technical issues

[0008] This specification proposes a method for obtaining a high-definition magnified image of a specific part of a photographed object when the image is photographed, without performing any subsequent image processing on the photographed image.

[0009] Means of solving problems

[0010] In order to solve the problem, the present specification discloses an image shooting method, which is an image shooting method performed by an image shooting device, including: a step of obtaining information about the current position of a sensor and a generator, i.e., a first position; a step of moving the sensor and the generator to a second position, wherein the second position is a position for obtaining an image with a different magnification from the image of the object obtained when the sensor and the generator are located at the first position; and a step of obtaining an image of the object, wherein the sensor and the generator are moved the same distance to prevent the interval distance between the sensor and the generator from changing.

[0011] Moreover, the present specification discloses an image capturing device, comprising: a sensor; a generator; and a processor, which obtains information of the current position of the sensor and the generator, i.e., a first position, and moves the sensor and the generator to a second position, wherein the second position is a position for obtaining an image having a different magnification than the image of the subject obtained when the sensor and the generator are located at the first position, and the processor controls the movement of the sensor and the generator in order to obtain the image of the subject, and the sensor and the generator move the same distance to prevent the interval distance between the sensor and the generator from changing.

[0012] Furthermore, the present specification provides a computer-readable recording medium in which a computer program for executing the above-described image capturing method is recorded.

[0013] Moreover, the present specification provides an image capturing system, comprising: the image capturing device described above; and a database, which stores images captured by the image capturing device together with information of the captured object, wherein images of the captured object at a second position having a different magnification from the image of the captured object at a first position are stored in the database.

[0014] Effects of the Invention

[0015] By utilizing the image processing method and device according to an embodiment of the present invention, a high-definition magnified image of a specific portion of the photographed object can be obtained when the image is photographed without the need for additional post-processing of the photographed image.

[0016] In addition, by utilizing the image processing method and apparatus according to another embodiment, the user can use normal radiation dose to capture a high-definition magnified image of a specific area of ​​the subject, thereby reducing unnecessary radiation dose to the subject. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to provide a more complete understanding of the drawings cited in the detailed description of the present invention, a detailed description of the drawings is provided.

[0018] Figure 1Reference drawings are provided for explaining the terms used in this specification.

[0019] Figure 2 FIG. 1 is a diagram showing an image capturing device according to an embodiment.

[0020] Figure 3 and Figure 4 A conceptual diagram illustrating a method of changing an image magnification ratio in an image capturing method performed by an image capturing device according to an embodiment.

[0021] Figure 5 FIG. 1 is a sequence diagram showing the operation of an image capturing device according to an embodiment.

[0022] Figure 6 The figure is a block diagram for explaining the specific structure of an image capturing device according to an embodiment.

[0023] Figure 7 A block diagram illustrating a structure of an image capturing system including an image capturing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The description of specific structures or functions in the embodiments of the concepts according to the present invention disclosed in this specification is intended only to illustrate the embodiments of the concepts according to the present invention. The embodiments of the concepts according to the present invention can be implemented in various forms and are not limited to the embodiments described in this specification.

[0025] The present invention can be modified in various ways and can have various forms, and specific embodiments are illustrated in the drawings and described in detail in the original text. However, it should be understood that these are not limited to the disclosed forms of the specific present invention, but include all changes, equivalents and even substitutes included in the thought and technical scope of the present invention.

[0026] The terms "first", "second" and the like may be used to describe a variety of structural elements, but the structural elements are not limited to the terms. The terms may be used for the purpose of distinguishing one structural element from other structural elements. For example, without departing from the scope of the present invention, the first structural element may be referred to as the second structural element, and similarly, the second structural element may be referred to as the first structural element.

[0027] When it is mentioned that a certain structural element is "connected" or "coupled" to another structural element, it should be understood that it can be directly connected or coupled to the other structural element, but other structural elements may also exist in between. On the contrary, when it is mentioned that a certain structural element is "directly connected" or "directly coupled" to another structural element, it should be understood that there are no other structural elements in between. Other expressions used to illustrate the relationship between structural elements, that is, "between" and "directly between" or "adjacent to" and "directly adjacent to" and the like should also be interpreted in the same way.

[0028] The terms used in this specification are only used to illustrate specific embodiments and are not intended to limit the present invention. Unless the context clearly indicates a different meaning, a singular expression includes a plural expression. In this specification, terms such as "including" or "having" are intended to specify the existence of features, numbers, steps, actions, structural elements, components, or combinations thereof recorded in this specification, and shall not be understood to exclude the existence or additional possibility of one or more other features or numbers, steps, actions, structural elements, components, or combinations thereof.

[0029] Unless otherwise defined, all terms used in this specification, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. Terms defined in commonly used dictionaries should be interpreted as having the same meanings as those in the context of the relevant technology, and, unless explicitly defined in this specification, should not be interpreted in an ideal or overly formalized sense.

[0030] This specification describes an image capturing method according to an embodiment of the present invention for capturing an image of a subject, i.e., a photographed object, while changing the magnification ratio. Figure 1 and Figure 2 The following describes the terms used to describe the present invention and the basic structure of the image pickup device.

[0031] Figure 1 Reference drawings are provided for explaining the terms used in this specification.

[0032] The distance from the focal spot to the detector is the spatial distance from the generator to the sensor. The distance from the focal spot to the object is the spatial distance from the generator to the object.

[0033] The Focal spot to rotation center distance is the spatial distance from the generator to the gantry rotation axis, which is the axis about which the generator and sensor rotate. The Object to Detector Distance is the spatial distance from the object to the sensor. The magnification explained below is the value obtained by dividing the focal spot to detector distance (FDD) by the focal spot to object distance (FOD).

[0034] The field of view refers to the size of an area captured by a sensor at one time, which can be expressed as an angle, and can be corresponded to the area of ​​interest of the present invention.

[0035] Figure 2 FIG. 1 is a diagram showing an image capturing device 100 according to an embodiment. The image capturing device 100 according to an embodiment includes a generator 110 , a sensor 120 , and a control unit 130 .

[0036] In one embodiment, the generator 110 can generate X-rays. In one embodiment, the generator 110 generates X-rays according to a first mode or a second mode.

[0037] In one embodiment, the mode is used to distinguish the shooting method using X-rays. In one embodiment, the first mode may be a CT (Computed Tomography) imaging mode. The CT imaging can be used to shoot a three-dimensional image to understand the three-dimensional structure inside the human body.

[0038] The second mode may be a panoramic image shooting mode, which can be used to grasp the entire tooth state and structure through the panoramic image, and can be applied to diagnosis and surgery.

[0039] In one embodiment, the generator 110 determines the intensity and amount of X-rays generated according to the shooting mode and irradiated to the sensor 120, and may also determine the irradiation range through other collimators.

[0040] In addition, the focus of a specific object to be photographed can be changed, or X-rays can be generated according to other set imaging conditions.

[0041] In one embodiment, the sensor 120 collects the X-rays generated by the generator 110. Specifically, the sensor 120 absorbs the X-rays generated by the generator 110 and transmitted through the subject and converts them into electrical signals according to the first mode or the second mode. In addition, the converted electrical signals can be used to generate images.

[0042] In addition, in one embodiment, the sensor 120 changes the active area according to different shooting modes. For example, in the first mode and the second mode, the X-rays generated by the same generator 110 are collected, but only the X-rays collected through different active areas can be used to generate images.

[0043] In one embodiment, the control unit 130 can control the shooting conditions or active areas by software, so that a shooting environment is formed according to a shooting mode. Further, the control unit 130 can control the physical actions of the generator 110 and the sensor 120 by hardware, so that a shooting environment can be formed according to different shooting modes.

[0044] Below, refer to Figure 3 and Figure 4 , a method of changing an image magnification ratio in an image capturing method performed by the image capturing device 100 according to an embodiment is described. Figure 3 The diagram is a diagram for explaining the position of an object using the sensor 120 and the generator 110 and the photographed object 140 before the magnification is changed. Figure 3 The target region 141 is set to the entire portion of the object 140 .

[0045] The X-rays generated by the generator 110 pass through the photographed object 140 and then enter the sensor 120, thereby obtaining a photographed image of the photographed object 140 through the sensor 120. Figure 3 In the example shown, as X-rays that have penetrated the entire region of the photographic object 140 enter the image plane of the sensor 120, the entire region 141 indicated by hatching in the photographic object 140 is acquired by the sensor as a photographic image.

[0046] Figure 4 A diagram for explaining the relative positions of the sensor 120, the generator 110, and the photographic object 140 after the magnification of the image photographing device 100 is changed according to an embodiment. The image photographing device 100 according to an embodiment moves the positions of the sensor 120 and the generator 110 according to a photographing mode. Therefore, the relative position of the photographic object 140 located between the sensor 120 and the generator 110 is changed. The sensor 120 and the generator 110 move the same distance in case the compartment distance between the sensor 120 and the generator 110 changes. In this case, although the distance between the sensor 120 and the generator 110 is the same, the magnification can be changed as the distance between the generator 110 and the photographic object 140 changes.

[0047] In the case where the relative position of the photographic object 140 in the space between the sensor 120 and the generator 110 is changed, the object-to-detector distance (ODD) value changes as the spatial distance between the sensor 120 and the photographic object 140 changes, and the focus-to-object distance (FOD) value changes as the spatial distance between the generator 110 and the photographic object 140 changes. However, the sensor 120 and the generator 110 move the same distance to prevent the compartment distance between the sensor 120 and the generator 110 from changing. In this case, by maintaining the spatial distance between the sensor 120 and the generator 110, the focus-to-detector distance (FDD) value does not change.

[0048] For example, Figure 4 As shown in FIG. 1 , when the object 140 and the generator 110 are close to each other, the FOD value decreases. However, since the FOD value is the same, the sensor 120 obtains an image obtained by magnifying a portion of the object. Figure 3 In contrast, as the X-rays penetrating a partial area of ​​the photographed object 140 are incident on the image plane of the sensor 120, Figure 4 In the embodiment, the sensor obtains the focus area 141 selected by the shadow in the photographed object 140 as the photographed image. Therefore, the image capturing device 100 according to an embodiment can simply obtain a high-definition image of the enlarged image of the focus area 141 of the photographed object without additional software processing.

[0049] Determining the location of the sensor 120 and the generator 110

[0050] In one embodiment, the user can determine the relative position of the photographed object 140 between the sensor 120 and the generator 110 according to the photographing mode, and realize the image magnification required by the photographing mode. Here, the photographing mode includes at least one of a panoramic photographing mode and a CT photographing mode.

[0051] Furthermore, when the user requests to capture an enlarged image of a specific area of ​​interest 141 in the photographed object 140 , the image capturing device 100 may move the positions of the sensor 120 and the generator 110 in order to capture the enlarged image.

[0052] In one embodiment, the user may determine the relative position of the photographed object 140 between the sensor 120 and the generator 110 so that a maximum magnification image of a region of interest 141 of the photographed object 140 may be obtained according to the active area of ​​the sensor 120. The region of interest may be a portion of the oral cavity of the subject whose X-ray image is taken. For example, it may be the upper jaw, the lower jaw, or a portion thereof.

[0053] In one embodiment, the positions of the sensor 120 and the generator 110 for capturing an image of the region of interest 141 may be determined based on the position and area of ​​the region of interest 141 in the actual world coordinate system.

[0054] In order to obtain a maximum magnification image of the area of ​​interest 141 by utilizing the active portion of the sensor 120, the image capturing device 100 may determine the positions of the sensor 120 and the generator 110 at positions where the light path from the generator 110 incident on the outermost portion of the activated area of ​​the sensor 120 contacts the outermost portion of the area of ​​interest 141 on the actual world coordinate system.

[0055] Figure 4 Show this example. Figure 4 The example in which the upper and lower ends of the target region 141 are incident from the generator 110 to the outermost portion of the activation region (Image Plane) of the sensor 120 is in contact with the upper end light path and the lower end light path.

[0056] In another embodiment, the positions of the sensor 120 and the generator 110 may be determined based on the position and area of ​​the region of interest 141 in the current image obtained at the current positions of the sensor 120 and the generator 110. The image capturing device 100 calculates a position correction value for converting the center coordinates of the region of interest 141 into the center coordinates of the current image and a correction value for converting the area of ​​the region of interest 141 into the area of ​​the current image, and the positions of the sensor 120 and the generator 110 that maximize the image of the region of interest may be determined using the calculated values.

[0057] In another embodiment, when there are multiple regions of interest 141 for the photographed object 140, the positions of the sensor 120 and the generator 110 can be determined at positions where a maximum magnification image including all the multiple regions of interest can be obtained through the active area of ​​the sensor.

[0058] The image capturing device 100 considers that the captured object 140 is an amorphous three-dimensional object, and can calculate the positions of the sensor 120 and the generator 110 at each rotation angle of the sensor 120 and the generator 110. The positions of the sensor 120 and the generator 110 for obtaining the calculated maximum magnification image of the region of interest 141 of the captured object 140 are calculated in advance and stored in a memory, and are imported and used later as needed.

[0059] In one embodiment, the image capturing device 100 calculates the relative positions of the sensor 120 and the generator with respect to the object 140 located between the sensor 120 and the generator 110 in advance, taking into account the size of the sensor 120, the position and size of the region of interest 141 in the object 140, the magnification, and the focus-to-detector distance (FDD) value, and selects the calculated result to be used as needed. For example, in order to prevent a phenomenon in which a portion (especially, the outermost portion) of the region of interest 141 set for the object 140 is not obtained by the sensor 120, the image capturing device 100 places the object 140 at a position where the entire portion of the region of interest 141 is obtained by the sensor at a maximum, and is further away from the generator 110 than the position calculated in advance.

[0060] Position movement of the sensor 120 and the generator 110

[0061] The image capturing device 100 maintains the same spatial compartment of the sensor 120 and the generator 110, and can move the positions of the sensor 120 and the generator 110 relative to the photographed object 140. The image capturing device 100 may include a moving unit for moving the sensor 120 and the generator 110, and the moving unit may be composed of a brake, etc. The moving unit is directly combined with the sensor 120 and the generator 110, or can be combined with a receiving module that receives the sensor 120 and the generator 110.

[0062] In one embodiment, in order to effectively obtain an enlarged image and make the image of the region of interest 141 obtained by the sensor 120 and the generator 110 become a specific part of the photographed object, the image capturing device 100 may change the three-dimensional position of the sensor 120 and the generator 110. To this end, the image capturing device 100 may further include a moving unit, and the moving unit is used to change the three-dimensional position of the sensor 120 and the generator 110. As an alternative embodiment, in order to make the image of the region of interest 141 obtained by the sensor 120 and the generator 110 become a specific part of the photographed object, the image capturing device 100 may change the three-dimensional position of the photographed object 140, and the image capturing device 100 may include a moving unit for moving the photographed object 140.

[0063] In one embodiment, the sensor 120 and the generator 110 may be connected to the gantry through a moving unit, respectively. The sensor moving unit and the generator moving unit may move the sensor 120 and the generator 110 in the horizontal and / or vertical directions on the gantry. The sensor moving unit and the generator moving unit may move the sensor 120 and the generator 110 in the horizontal / vertical directions along with the movable part on the gantry. The sensor moving unit and the generator moving unit may extend in the horizontal / vertical directions, thereby being able to move the positions of the sensor 120 and the generator 110 in the horizontal / vertical directions.

[0064] In one embodiment, in order to obtain a magnified image of the region of interest 141 of the photographed object 140 to the maximum extent, the sensor 120 and the generator 110 may be moved to a position where the center point of the sensor 120, the center point of the generator 110, and the center point of the region of interest 141 are located on a straight line. If necessary, in order to capture an image in a diagonal direction, the sensor 120 and the generator 110 may be tilted.

[0065] In other embodiments, the sensor 120 and the generator 110 may be fixed on the gantry. In this embodiment, in order to move the fixed sensor 120 and the generator 110, the gantry may be moved. The gantry moving unit may move the gantry in the horizontal / vertical direction. At this time, the position of the rotation axis of the gantry may not change in the actual world coordinate system. For this reason, the gantry can be divided into a portion constituting the rotation axis and a portion connecting the sensor 120 and the generator 110, and only the portion connecting the sensor 120 and the generator 110 moves relative to the portion constituting the rotation axis of the gantry.

[0066] In order to obtain a magnified image of the region of interest 141 of the photographed object 140 to the maximum extent, the gantry can be moved to a position where the center point of the sensor 120, the center point of the generator 110, and the center point of the region of interest 141 are on a straight line. If necessary, the gantry can be tilted to capture an image in an oblique direction.

[0067] As an alternative embodiment, the image capturing device 100 may move the position of the captured object 140 between the sensor 120 and the generator 110. The image capturing device 100 may include a moving unit for moving the captured object 140, and the moving unit may be composed of a brake, etc. The moving unit may be combined with a module where the captured object 140 is located. For example, when the captured object is a person, the module where the captured object 140 is located may be a chair for the person to sit on, or a bed for the person to lie on.

[0068] Figure 5 1 is a sequence diagram showing the operation of the image capturing device 100 according to an embodiment. First, the image capturing device 100 determines a capture mode (S110). The capture mode may be determined in advance. The capture mode may be one of a panoramic capture mode and a CT capture mode, and may further include other capture modes to change the magnification of the region of interest set according to the embodiment.

[0069] The image capturing device 100 may determine the capturing mode according to the user's input. Alternatively, the image capturing device 100 may change the capturing mode in sequence in order to obtain the image of the captured object according to a pre-programmed image capturing sequence.

[0070] Next, the image capturing device 100 determines the magnification of the image according to the selected shooting mode (S130). The magnification according to the shooting mode may be stored in advance in the image capturing device 100. Alternatively, the image capturing device 100 may ask the user to select the magnification, and may determine the magnification according to the user's input.

[0071] Next, the image capturing device 100 captures an image according to the determined magnification (S150). Figure 4 As shown, the image capturing device 100 can change the positions of the sensor 120 and the generator 110 or the position of the captured object 140 .

[0072] In one embodiment, a plurality of independent regions of interest may be set for the photographing object 140. In this case, a photographing position of the sensor 120 and the generator 110 for photographing an image at a maximum magnification may be set for each region of interest. A plurality of photographing positions of the sensor 120 and the generator 110 for independently photographing regions of interest may be generated.

[0073] The sensor 120 and the generator 110 used to independently capture images for each region of interest should move their positions multiple times. In order to minimize the moving distance of the sensor 120 and the generator 110, the shortest distance path of the sensor 120 and the generator 110 using multiple capturing positions as each transfer station can be calculated. The position movement itinerary of the sensor 120 and the generator 110 can be generated thereby. The image capturing device 100 can capture images of the region of interest according to the generated position movement itinerary.

[0074] Figure 6 FIG. 1 is a block diagram illustrating a detailed structure of an image capturing device 100 according to an embodiment. Figure 6As shown, the apparatus may include: a generator 110, a sensor 120, a control unit 130, a photographing object position module 142, a position setting module 150, a user interface 160, and a communication module 170. The photographing object position module 142, the user interface 160, and the communication module 170 are structures that can be selected and used according to the embodiment and can be omitted.

[0075] As described above, the generator 110 is a light source for generating X-rays, and a conventional X-ray generator may be used, and may further include a collimator, etc. as required.

[0076] As described above, the sensor 120 may be a conventional X-ray sensor for collecting X-rays to obtain images. The sensor 120 may be a large area sensor for capturing panoramic or CT images. The size of the sensor 120 may be selected in consideration of the size of the region of interest of the object 140, the magnification, and the focus-to-detector distance (FDD) value.

[0077] The control unit 130 includes a processor and a memory. The processor controls the image capturing device 100 and performs control for executing the above-mentioned image capturing method. The memory includes temporary and non-temporary data required for starting the image capturing device. The memory may include the image magnification and the corresponding position data of the generator 110 and the sensor 120 according to the image capturing mode.

[0078] The object position module 142 stores the object to be photographed, thereby specifying the position of the object to be photographed. The object position module 142 is an optional component and can be omitted.

[0079] The position setting module 150 may move the positions of the generator 110 and the sensor 120. According to an embodiment, the position setting module 150 may move the position of the photographed object position module 142.

[0080] The user interface 160 is an interface unit between the image capturing device 100 and the user, and can use a conventional input device and output device. The communication module 170 is an interface unit between the image capturing device 100 and an external device, and can use a conventional wireless communication module. The user interface 160 and the communication module 170 are optional components and can be omitted.

[0081] Figure 7 FIG. 1 is a block diagram for explaining the structure of an image capturing system 1000 including an image capturing device 100 according to an embodiment. Figure 6The image capture device 100 , the database 200 , and the processor 500 shown may also include a user interface 300 and a communication module 400 .

[0082] The image capturing system 1000 further includes a database 200, and the image data of the captured object obtained from the image capturing device 100 can be stored in the captured object. For example, when used in a hospital, a doctor can specify the patient in the database and store the X-ray image captured of the patient.

[0083] As described above, the image shooting method according to one embodiment can be implemented in the form of program instructions executed by various computer means, and can be recorded in a computer-readable medium. The computer-readable medium can include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded in the above-mentioned medium can be specially designed and constructed according to the embodiment, or can be used for computer software technicians. Examples of computer-readable recording media include: magnetic media, such as hard disks, floppy disks and tapes; optical media, CD-ROM, DVD; magneto-optical media, such as floptical disks; and specially configured hardware devices such as read-only memory (ROM), random access memory (RAM), flash memory, etc. for storing and executing program instructions. Examples of program instructions include not only machine languages ​​such as those made by compilers, but also high-level language codes that can be executed by computers using interpreters, etc.

[0084] The drawings referred to in the description of the above embodiments are merely embodiments provided for convenience of description. The information items, contents and pictures displayed on each screen may be deformed and displayed in various forms.

[0085] Although the present invention has been described with reference to the illustrated embodiments, this is only illustrative, and it should be understood that those skilled in the art can implement various modifications and equivalent other embodiments. Therefore, the true technical protection scope of the present invention should be determined based on the technical concept of the scope of the claims.

Claims

1. An image capturing method, which is an image capturing method performed by an image capturing device, characterized in that: include: The step of obtaining information of the current position of the sensor and the generator, that is, the first position corresponding to the first shooting mode; Entering a second shooting mode different from the first shooting mode; As the second shooting mode is entered, the step of moving the sensor and the generator to a second position corresponding to the second shooting mode, the second position being a position for obtaining an image having a different magnification from an image of the shooting object obtained when the sensor and the generator are located at the first position; as well as executing the second shooting mode to obtain an image of the shooting object, The sensor and the generator move the same distance to prevent the distance between the sensor and the generator from changing at the first position and the second position, The distance between the generator and the photographed object is different from each other at the first position and the second position, In the first shooting mode and the second shooting mode, images are obtained by the same sensor. The second position is determined to be a position where the active area of ​​the sensor can obtain a maximum magnification image of the region of interest of the photographed object. The second position is determined based on the position and area of ​​the region of interest in the actual world coordinate system or the position and area of ​​the region of interest in the image obtained by the sensor and the generator located at the first position, When the second position is determined by the position and area of ​​the region of interest in the image obtained by the sensor and the generator located at the first position, the second position is determined by using a position correction value that converts the center coordinates of the region of interest into the center coordinates of the current image and a correction value that converts the area of ​​the region of interest into the area of ​​the current image.

2. The image capturing method according to claim 1, characterized in that: The sensor is a large area sensor for capturing panoramic images or CT.

3. The image capturing method according to claim 1, wherein: The first position and the second position are determined according to a photographing mode of the photographing object, and the photographing mode includes at least one of a panoramic photographing mode and a CT photographing mode.

4. The image capturing method according to claim 1, wherein: The region of interest includes a portion of the subject's oral cavity.

5. The image capturing method according to claim 4, characterized in that: When there are a plurality of regions of interest for the photographic object, the second position is determined to be a position where a maximum magnification image including the plurality of regions of interest can be obtained by the active area of ​​the sensor.

6. The image capturing method according to claim 4, characterized in that: The sensor and the generator are moved to positions where a center point of the sensor, a center point of the generator, and a center point of the region of interest are located on a straight line.

7. The image capturing method according to claim 4, characterized in that: The sensor and the generator are rotated across the photographed object, and the second position is calculated at each rotation angle of the sensor and the generator.

8. The image capturing method according to claim 4, characterized in that: The second position is determined in advance in each area of ​​interest of the photographed object and stored in a memory.

9. The image capturing method according to claim 1, wherein: There are multiple areas of interest for the photographed object. Determine a second position in each of the plurality of focus regions, where the second position is a position where a maximum magnification image of the focus region of the photographed object can be obtained based on the position and area of ​​the focus region of the photographed object; In order to minimize the movement of the sensor and the generator, movement strokes of the sensor and the generator are generated according to a plurality of the second positions, and the sensor and the generator are moved according to the generated movement strokes.

10. An image capturing device, characterized in that: include: sensor; generator; as well as a processor, obtaining information of current positions of the sensor and the generator, i.e., first positions corresponding to a first shooting mode, entering a second shooting mode different from the first shooting mode, and moving the sensor and the generator to a second position corresponding to the second shooting mode as entering the second shooting mode, the second position being a position at which an image having a different magnification from an image of the shooting object obtained when the sensor and the generator are located at the first position is obtained, and the processor controlling the actions of the sensor and the generator in order to execute the second shooting mode to obtain an image of the shooting object, The sensor and the generator move the same distance to prevent the distance between the sensor and the generator from changing at the first position and the second position, The distance between the generator and the photographed object is different from each other at the first position and the second position, In the first shooting mode and the second shooting mode, images are obtained by the same sensor. The second position is determined to be a position where the active area of ​​the sensor can obtain a maximum magnification image of the region of interest of the photographed object. The second position is determined based on the position and area of ​​the region of interest in the actual world coordinate system or the position and area of ​​the region of interest in the image obtained by the sensor and the generator located at the first position, When the second position is determined by the position and area of ​​the region of interest in the image obtained by the sensor and the generator located at the first position, the second position is determined by using a position correction value that converts the center coordinates of the region of interest into the center coordinates of the current image and a correction value that converts the area of ​​the region of interest into the area of ​​the current image.

11. The image capturing device according to claim 10, wherein: The sensor and the generator are respectively connected to a gantry, and the sensor and the generator move horizontally or vertically on the gantry to the second position.

12. The image capturing device according to claim 10, wherein: The sensor and the generator are connected to a gantry respectively. In order to move the positions of the sensor and the generator, the gantry moves in a horizontal or vertical direction, and the position of the rotation axis of the gantry remains unchanged in the actual world coordinate system.

13. The image capturing device according to claim 10, characterized in that: The sensor is a large area sensor used for capturing panoramic images or CT images.

14. The image capturing device according to claim 10, wherein: The first position and the second position are determined according to a photographing mode of the photographing object, and the photographing mode includes at least one of a panoramic photographing mode and a CT photographing mode.

15. The image capturing device according to claim 10, wherein: The region of interest includes a portion of the subject's oral cavity.

16. The image capturing device according to claim 10, wherein: The second position is a position where the center point of the sensor, the center point of the generator, and the center point of the focus area of ​​the photographed object are located on a straight line.

17. The image capturing device according to claim 16, wherein: The sensor and the generator move with the movement of the gantry to which the sensor and the generator are connected, The gantry is tilted so that the sensor and the generator are positioned so that a center point of the sensor, a center point of the generator, and a center point of the region of interest are located on a straight line.

18. A computer-readable recording medium, characterized in that: A computer program for executing the method according to any one of claims 1 to 9 is recorded therein.

19. An image capturing system, characterized in that: include: The image capturing device according to claim 10; as well as A database is used to store the images captured by the image capturing device together with the captured object information. The image of the photographed object is stored in the database.

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