CN110811550A - Tooth imaging system and method based on depth image - Google Patents
Tooth imaging system and method based on depth image Download PDFInfo
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- CN110811550A CN110811550A CN201910984424.9A CN201910984424A CN110811550A CN 110811550 A CN110811550 A CN 110811550A CN 201910984424 A CN201910984424 A CN 201910984424A CN 110811550 A CN110811550 A CN 110811550A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
- A61B5/0088—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for oral or dental tissue
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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Abstract
The invention discloses a tooth imaging system and an imaging method based on a depth image, and relates to the technical field of medical imaging, wherein the system comprises an infrared distance measurement module, a depth imaging module and an image processing module; shooting the tooth state in the oral cavity through a depth camera to obtain a depth image; the depth image is processed into an image capable of clearly representing the tooth profile, and the image is normalized according to the reference point and the distance data. The invention applies the depth image technology to oral imaging, can effectively observe the internal conditions of the oral cavity, can accurately display images of oral problems such as wisdom teeth, caries and the like, and assists doctors to effectively diagnose symptoms of patients.
Description
Technical Field
The invention relates to the technical field of medical imaging, in particular to a tooth imaging system and method based on a depth image.
Background
The oral health is an important part of human body health, and not only can the oral health enable people to chew food fully to provide enough nutrition for the body, but also can avoid and reduce the occurrence of oral virus infection, diabetes, coronary heart disease, stomach illness, newborn low body weight and other diseases. With the development of society and the improvement of people's living standard, the oral health problem is more and more regarded by people. However, due to the special position of the oral cavity, especially the special arrangement of teeth in the oral cavity of human body, the conventional dental disease examination means is oral X-ray film. However, the limitation is that the patient needs to judge the tooth state through oral imaging, but the technical means is mostly needed to shoot the oral X-ray film, and on the other hand, the patient shoots the X-ray film and causes unnecessary damage to the human body due to the fact that the X-ray film is received and placed.
Depth images, also known as range images, refer to images having as pixel values the distances (depths) from an image grabber to points in a scene, which directly reflect the geometry of the visible surface of a scene. The depth image can be calculated into point cloud data through coordinate conversion, and the point cloud data with regular and necessary information can also be inversely calculated into depth image data. The depth image technology is applied to oral imaging, so that the internal conditions of the oral cavity can be effectively observed, particularly, accurate image display can be carried out on oral problems such as wisdom teeth, caries and the like, and doctors are assisted to carry out effective diagnosis on symptoms of patients.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a tooth imaging system and an imaging method based on a depth image. The complete tooth image in the oral cavity is obtained by infrared distance measurement, depth image acquisition and depth image processing of the interior of the oral cavity.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a dental imaging system based on depth images, comprising:
the infrared distance measurement module is used for calculating the distance between the oral cavity base surface and the imaging equipment to obtain a reference point and distance data;
the depth imaging module is used for shooting the internal state of the oral cavity to form a depth image;
and the image processing module is used for processing the acquired depth image to form an internal tooth image of the oral cavity.
The system of the invention obtains a complete dental image in the oral cavity by infrared distance measurement, depth image acquisition and depth image processing of the oral cavity. The disease need not to shoot the X-ray piece, and imaging speed is fast, the imaging quality is higher, can effectively observe the inside condition in oral cavity, especially can carry out accurate image show to oral cavity problems such as wisdom tooth, caries, and supplementary doctor carries out effectual diagnosis to the disease symptom.
Preferably, the system of the present invention further comprises a data transmission module and a PC terminal, wherein the data transmission module is used for transmitting the dental image inside the oral cavity to the PC terminal in a wired communication manner or a wireless communication manner, and the PC terminal is used for displaying the complete dental image inside the oral cavity on a display of the PC terminal.
The complete internal dental image of the oral cavity is transmitted to the PC end through the data transmission module and is displayed on the display of the PC end, so that doctors and patients can visually observe the internal condition of the oral cavity.
Preferably, the data transmission module encrypts the dental image inside the oral cavity and transmits the dental image to the PC terminal, and the PC terminal decrypts the dental image inside the oral cavity and displays the dental image on a display of the PC terminal.
The data transmission module and the PC terminal carry out encryption and decryption operations on the image when sending and receiving the image, and the information security is ensured.
In another aspect, the present invention provides a method for dental imaging based on depth images, comprising the steps of:
calibrating the distance between a reference point and an image collector in the oral cavity through infrared reflection time, and storing the position of the reference point in a depth image to obtain the reference point and distance data;
shooting the tooth state in the oral cavity through a depth camera, and representing the distance between each part of the tooth and the depth camera by using a gray value to obtain a depth image;
and processing the depth image into an image capable of clearly representing the tooth outline by using a depth image algorithm, and normalizing the image according to the datum point and the distance data obtained by infrared ranging to obtain the tooth image in the oral cavity.
The depth image technology is applied to oral imaging, so that the internal conditions of the oral cavity can be effectively observed, particularly, accurate image display can be carried out on oral problems such as wisdom teeth, caries and the like, and doctors are assisted to carry out effective diagnosis on symptoms of patients.
Preferably, the method of the present invention further comprises the steps of:
the dental image in the oral cavity is transmitted to the corresponding PC terminal in a wired communication mode or a wireless communication mode, and the complete dental image in the oral cavity is displayed on a display of the PC terminal by the PC terminal.
The complete dental image inside the oral cavity is transmitted to the PC end and displayed on the display of the PC end, so that doctors and patients can visually observe the inside condition of the oral cavity.
Preferably, the method of the present invention further comprises the steps of: the dental image in the oral cavity is encrypted before being transmitted to the PC end, and the PC end decrypts the dental image in the oral cavity after receiving data and then displays the dental image on a display of the PC end.
The image is encrypted and decrypted when the image is sent and received, and the information security is ensured.
Preferably, the method of the present invention represents the distance of each portion of the tooth from the depth camera with 256 gray scale values.
The 256-level gray values indicate more accurate distances.
Has the advantages that:
1. the system of the invention obtains a complete dental image in the oral cavity by infrared distance measurement, depth image acquisition and depth image processing of the oral cavity. Patients do not need to take X-ray films, the imaging speed is high, the imaging quality is higher, the internal conditions of the oral cavity can be effectively observed, particularly, the oral cavity problems such as wisdom teeth and caries can be accurately displayed, and doctors are assisted to effectively diagnose the symptoms of the patients;
2. the complete dental image inside the oral cavity is transmitted to the PC end through the data transmission module and is displayed on a display of the PC end, so that doctors and patients can visually observe the internal condition of the oral cavity;
3. the data transmission module and the PC terminal encrypt and decrypt the image when sending and receiving the image, so that the information security is ensured;
4. the depth image technology is applied to oral imaging, so that the internal conditions of the oral cavity can be effectively observed, particularly, accurate image display can be carried out on oral problems such as wisdom teeth, caries and the like, and doctors are assisted to effectively diagnose the symptoms of patients;
5. the complete dental image inside the oral cavity is transmitted to the PC end and displayed on a display of the PC end, so that doctors and patients can visually observe the conditions inside the oral cavity;
6. when the image is sent and received, the image is encrypted and decrypted, so that the information security is ensured;
7. the 256-level gray values indicate more accurate distances.
Detailed Description
The invention is further illustrated below:
example (b):
the invention provides a dental imaging system based on a depth image, comprising:
the infrared distance measurement module is used for calculating the distance between the oral cavity base surface and the imaging equipment to obtain a reference point and distance data; the infrared distance measurement module uses infrared rays as a medium, judges the distance between the oral cavity base surface and the image collector through infrared ray reflection time and takes the distance as a reference distance. The basal plane of the oral cavity, namely a measuring point selected in infrared distance measurement, is generally positioned in the center of the depth image and can be modified.
The depth imaging module is used for shooting the internal state of the oral cavity to form a depth image; the tooth depth image is acquired through the depth camera, namely, the distances from all parts of the diseased tooth in the oral cavity to the depth camera are reflected, the distances are expressed by pixel values, and the distance range can be expressed by 256-level gray images due to the fact that the depth image acquisition equipment acquires the image in the oral cavity, and the tooth state can be reflected more clearly.
And the image processing module is used for processing the acquired depth image to form an internal tooth image of the oral cavity. First, the image is processed by a depth image algorithm, such as a depth image contour algorithm. The depth image contour line algorithm is characterized in that differences of image depths in the depth image are regarded as contour lines for describing altitude in geography, and points with the same height are surrounded to form a closed curve which is projected to a plane of a reference distance to formThe contour lines with obvious hierarchical distribution can determine the position, the missing and other conditions of the teeth. Then, according to the reference distance and the reference point position measured by the infrared distance measuring module, the depth image data is normalized, and the reference point position is assumed to be (x)m,ym) The infrared measurement distance is 45mm and the image depth is 80, the normalized coefficient k is 45/80, i.e., 9/16. And multiplying the depth of the image of the rest pixel points by k to finish the normalization processing and carry out distance calibration on the image. The depth image contour line algorithm is only used as an example for describing the depth image processing process, and other depth image algorithms such as a watershed algorithm can be used instead of the depth image contour line algorithm, and the patent right is not limited.
The system of the invention obtains a complete dental image in the oral cavity by infrared distance measurement, depth image acquisition and depth image processing of the oral cavity. The disease need not to shoot the X-ray piece, and imaging speed is fast, the imaging quality is higher, can effectively observe the inside condition in oral cavity, especially can carry out accurate image show to oral cavity problems such as wisdom tooth, caries, and supplementary doctor carries out effectual diagnosis to the disease symptom.
In one embodiment, the system further comprises a data transmission module and a PC (personal computer) end, wherein the data transmission module is used as a middleware for data acquisition and processing and PC end software, the PC end software is used for receiving image data transmitted by the data transmission module, the data transmission module is used for transmitting the dental image inside the oral cavity to the PC end in a wired communication mode or a wireless communication mode, and the PC end is used for displaying the complete dental image inside the oral cavity on a display of the PC end for a doctor and a patient to check and assist the doctor in diagnosing the oral condition.
The complete internal dental image of the oral cavity is transmitted to the PC end through the data transmission module and is displayed on the display of the PC end, so that doctors and patients can visually observe the internal condition of the oral cavity.
In one embodiment, the data transmission module encrypts the dental image inside the oral cavity and transmits the dental image inside the oral cavity to the PC terminal, and the PC terminal decrypts the dental image inside the oral cavity and displays the dental image on a display of the PC terminal.
The data transmission module and the PC terminal carry out encryption and decryption operations on the image when sending and receiving the image, and the information security is ensured.
The invention also provides a tooth imaging method based on the depth image, which comprises the following steps:
the distance between the reference point and the image collector in the oral cavity is calibrated through infrared reflection time, the position of the reference point in the depth image is stored, infrared rays are used as a medium by the infrared distance measuring module, and the distance between the oral cavity base surface and the image collector is judged through the infrared reflection time and is used as a reference distance. The oral cavity base surface is a measuring point selected in infrared distance measurement, and the point is generally positioned in the center of the depth image and can be modified;
shooting the state of the teeth in the oral cavity through a depth camera, and representing the distance between each part of the teeth and the depth camera by using a gray value; the tooth depth image is acquired through the depth camera, namely, the distances from all parts of the diseased tooth in the oral cavity to the depth camera are reflected, the distances are expressed by pixel values, and the distance range can be expressed by 256-level gray images due to the fact that the depth image acquisition equipment acquires the image in the oral cavity, and the tooth state can be reflected more clearly.
And processing the depth image into an image capable of clearly representing the tooth outline by using a depth image algorithm, and normalizing the image according to the datum point and the distance data obtained by infrared ranging to obtain the tooth image in the oral cavity. First, the image is processed by a depth image algorithm, such as a depth image contour algorithm. The depth image contour line algorithm is characterized in that differences of image depths in depth images are regarded as contour lines for describing altitude in geography, points with the same height are surrounded to form a closed curve and are projected to a plane of a reference distance to form contour lines with obvious hierarchical distribution, and the positions, the missing situations and the like of teeth can be determined through the contour lines. Then, according to the reference distance and the reference point position measured by the infrared distance measuring module, the depth image data is normalized, and the reference point position is assumed to be (x)m,ym) The infrared measurement distance is 45mm and the image depth is 80, the normalized coefficient k is 45/80, i.e., 9/16. The rest pixel point imagesAnd multiplying the depth by k to finish the normalization processing and carry out distance calibration on the image. The depth image contour line algorithm is only used as an example for describing the depth image processing process, and other depth image algorithms such as a watershed algorithm can be used instead of the depth image contour line algorithm, and the patent right is not limited.
The depth image technology is applied to oral imaging, so that the internal conditions of the oral cavity can be effectively observed, particularly, accurate image display can be carried out on oral problems such as wisdom teeth, caries and the like, and doctors are assisted to carry out effective diagnosis on symptoms of patients.
In one embodiment, the method of the present invention further comprises the steps of:
the dental image in the oral cavity is transmitted to the corresponding PC terminal in a wired communication mode or a wireless communication mode, and the complete dental image in the oral cavity is displayed on a display of the PC terminal by the PC terminal.
The complete dental image inside the oral cavity is transmitted to the PC end and displayed on the display of the PC end, so that doctors and patients can visually observe the inside condition of the oral cavity.
In one embodiment, the method of the present invention further comprises the steps of: the dental image in the oral cavity is encrypted before being transmitted to the PC end, and the PC end decrypts the dental image in the oral cavity after receiving data and displays the dental image on a display of the PC end.
The image is encrypted and decrypted when the image is sent and received, and the information security is ensured.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (7)
1. A dental imaging system based on depth images, comprising:
the infrared distance measurement module is used for calculating the distance between the oral cavity base surface and the imaging equipment to obtain a reference point and distance data;
the depth imaging module is used for shooting the internal state of the oral cavity to form a depth image;
and the image processing module is used for processing the acquired depth image to form an internal tooth image of the oral cavity.
2. The dental imaging system based on depth images according to claim 1, further comprising a data transmission module and a PC terminal, wherein the data transmission module is used for transmitting the dental image inside the oral cavity to the PC terminal through a wired communication mode or a wireless communication mode, and the PC terminal is used for displaying the complete dental image inside the oral cavity on a display of the PC terminal.
3. The dental imaging system based on the depth image as claimed in claim 2, wherein the data transmission module encrypts the intra-oral dental image and transmits the intra-oral dental image to the PC terminal, and the PC terminal decrypts the intra-oral dental image and displays the intra-oral dental image on a display of the PC terminal.
4. A dental imaging method based on a depth image is characterized by comprising the following steps:
calibrating the distance between a reference point and an image collector in the oral cavity through infrared reflection time, and storing the position of the reference point in a depth image to obtain the reference point and distance data;
shooting the tooth state in the oral cavity through a depth camera, and representing the distance between each part of the tooth and the depth camera by using a gray value to obtain a depth image;
and processing the depth image into an image capable of clearly representing the tooth outline by using a depth image algorithm, and normalizing the image according to the datum point and the distance data obtained by infrared ranging to obtain the tooth image in the oral cavity.
5. The depth-image-based dental imaging method according to claim 4, further comprising the steps of:
the dental image in the oral cavity is transmitted to the corresponding PC terminal in a wired communication mode or a wireless communication mode, and the complete dental image in the oral cavity is displayed on a display of the PC terminal by the PC terminal.
6. The depth-image-based dental imaging method according to claim 5, further comprising the steps of: the dental image in the oral cavity is encrypted before being transmitted to the PC end, and the PC end decrypts the dental image in the oral cavity after receiving data and then displays the dental image on a display of the PC end.
7. The method of claim 4, wherein the distance between each part of the tooth and the depth camera is represented by 256-level gray scale values.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113768468A (en) * | 2021-09-23 | 2021-12-10 | 广州华视光学科技有限公司 | Multi-sensor, multi-functional oral problem locating device and method |
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