An intelligent measuring device for vertical distance measurement of complete denture

Abstract

The application discloses an intelligent measuring device for vertical distance measurement of a full denture, and particularly relates to the technical field of medical devices, which comprises a laser emitting device, an image acquisition module, a laser path module, a data processing module, a control module, a warning device and a display screen. The laser emitting device, the image acquisition module, the laser path module, the data processing module, the control module, the warning device and the display screen are arranged, so that the moving track of a mark point marked by a doctor on the skin surface of a patient's chin can be captured in real time by a CMOS camera when the patient is in occlusion, the collected image data is preprocessed by calling the image acquisition module, the laser path module, the data processing module, the control module, the warning device and the display screen are called, the occlusal vertical distance of the patient is accurately measured, and the distance to be occluded by the doctor and the patient or whether the occlusion fails is prompted through real-time data on the display screen, a warning sound emitted by the warning device and a warning light turned on.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an intelligent measuring device for measuring the vertical distance of complete dentures. Background Technology

[0002] For patients with complete edentulism, accurately restoring the vertical distance of their bite is crucial for the retention and stability of complete dentures and for slowing down the resorption of the remaining alveolar ridge. However, accurately measuring and recording the vertical distance of edentulous patients has always been a challenge in the field of dentistry.

[0003] For measuring the vertical distance in edentulous patients, commonly used methods include subtracting the resting occlusal gap from the vertical distance in the resting jaw position, equating the distance from the pupil to the oral fissure with the vertical distance, and observing facial features. However, since the distance from the pupil to the oral fissure is not equal to the distance from the base of the nose to the base of the chin in everyone, and the facial feature observation method requires a certain level of clinical experience to be accurate, for less experienced young physicians, it is often necessary to first determine the vertical distance in the resting jaw position (i.e., the distance from the base of the nose to the base of the chin in a relaxed state) using a vertical distance measuring ruler, and then subtract 2-3 mm to obtain the vertical distance when the patient is in centric occlusion. The current clinical method for measuring vertical distance is as follows: First, the patient is instructed to sit upright with their eyes looking straight ahead, without chewing, speaking, or swallowing, and with their jaw completely relaxed. Two marks are made on the skin surface at the base of the nose (the intersection of the columella and the upper lip) and the submental point (the lowest point in the center of the chin). The distance between these two points is the vertical distance when the patient is in a resting jaw position. Then, a occlusal brace with a heated wax strip is placed on the alveolar process of the upper and lower jaws inside the patient's mouth. The doctor holds a vertical distance measuring ruler, which is a flat, vertically adjustable rigid ruler. The upper end is placed against the marked point at the base of the nose, and the lower end is lightly placed against the marked point under the chin. The patient is then instructed to bite down. After the mandible moves upward by 2-3 mm, i.e., the heated wax strip is flattened by 2-3 mm, the patient is instructed to stop biting. This position is the patient's centric occlusion position. The distance from the base of the nose to the base of the chin at this point is the patient's vertical occlusal distance. However, because the nasal floor and chin floor are both soft tissues and are compressible, existing vertical distance measuring rulers will shift when the measuring ruler is placed on these soft tissues with varying degrees of force, leading to significant measurement errors. Furthermore, when the upper and lower jaw supports are placed inside the patient's mouth, the supports and wax rims create a certain convexity in the patient's lips, forming an arc around the nasal floor, lips, and chin. This prevents the flat measuring ruler from simultaneously conforming to both the nasal floor and chin floor tissues, also resulting in significant measurement and reading errors. Additionally, since the measuring ruler cannot be fixed to the patient's face and must be held by the doctor, the shaking and other unstable factors during handling also increase measurement errors. Therefore, existing vertical distance measuring rulers are not suitable for use by inexperienced young physicians in clinical practice. Summary of the Invention

[0004] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide an intelligent measuring device for measuring the vertical distance of complete dentures, which solves the problems mentioned in the background art through modules.

[0005] To achieve the above objectives, the present invention provides the following technical solution: including a laser emitting device, an image acquisition module, a laser path module, a data processing module, a control module, an alarm device, and a display screen;

[0006] Laser emission device: A laser midline is projected onto the midline of the patient's face using a laser emission projector installed in front of the intelligent measuring device. A laser reference point is emitted onto the skin surface at the submental point of the patient's chin along this laser midline. At the same time, the doctor marks a mark on the skin surface at the submental point of the patient's chin with a marker that is the same size as and coincides with the laser reference point.

[0007] Image acquisition module: First, the CMOS camera installed in front of the intelligent measurement device acquires the laser reference point image data at the patient's submental point. Then, the doctor makes an occlusal bracket for the upper and lower jaws outside the mouth, places a softened wax strip of a certain height on the bracket, places the occlusal bracket in the patient's mouth, and instructs the patient to perform centric occlusion. The CMOS camera installed in front of the intelligent measurement device acquires the image data of the movement of the marked points on the skin surface at the submental point of the patient in real time during the occlusion process. The acquired image data is preprocessed and transmitted to the laser path module in the form of a two-dimensional image via wireless communication.

[0008] Laser path module: By acquiring image data sent by the image acquisition module, it extracts the position information of laser reference points and marker points in the image data, tracks and marks the movement trajectory of the marker points, and transmits the extracted position information of laser reference points and marker points and the movement data of marker points to the data processing module through wireless communication;

[0009] Data processing module: Analyzes the position information of the laser reference point and the marker point and the movement data of the marker point sent by the image acquisition module, calculates the vertical movement distance of the marker point, and transmits the calculation results to the control module via wireless communication;

[0010] Control module: Processes the calculation results received from the data processing module, visualizes the calculation results on the display screen, reminds doctors and patients of the distance to be bitten, and controls the alarm device to work.

[0011] In a preferred embodiment, after the laser emitting device projects a laser midline onto the midline of the patient's face using a laser emitting projector, a laser reference point is emitted onto the skin surface at the submental point of the patient's chin using the lower laser emitter on the laser midline. Simultaneously, on the skin surface at the submental point of the patient's chin, the doctor marks a mark that is the same size as and coincides with the laser reference point using a marker.

[0012] In a preferred embodiment, the CMOS camera installed in front of the intelligent measuring device first acquires laser reference point image data at the patient's submental point. Then, the doctor marks a point of equal size and overlap at the laser reference point at the submental point with a marker pen. A jaw support is then fabricated outside the mouth, and a softened wax strip of a certain height is placed on the jaw support. The jaw support is then placed inside the patient's mouth, and the patient begins to bite. The CMOS camera acquires real-time image data of the movement of the marked point on the skin surface at the submental point during the biting process. The image data is then preprocessed, and the specific preprocessing steps are as follows:

[0013] 301. Gamma correction is used to adjust the brightness and contrast of image data to obtain the corrected image. The specific formula is as follows:

[0014]

[0015] Where I represents the image brightness value, and IV represents the corrected brightness value. gamma Indicates the correction parameters;

[0016] 302. The brightness values ​​of the corrected image are remapped using histogram equalization. The specific formula is as follows:

[0017]

[0018] Where T(p) represents the mapped luminance value, p represents the corrected grayscale value of the image, and p i L represents the probability value corresponding to gray level i in the normalized histogram, and L represents the gray level of the image.

[0019] 303. The image after histogram equalization is obtained as the final output and transmitted to the laser path module via wireless communication.

[0020] In a preferred embodiment, after acquiring the histogram-equalized image, the laser path module first enhances the features of the laser reference point and marker point at the patient's submental point in the histogram-equalized image using morphological operations, including erosion and dilation, to obtain the enhanced histogram-equalized image.

[0021] Secondly, repeated iterations are performed, and a current threshold is set. When the difference between the current threshold and the threshold of the previous iteration is less than a preset threshold, the iteration stops. The enhanced histogram equalization image is binarized. The binarization process determines the pixel values ​​in the threshold comparison image based on the iteration. The laser reference point and marker point at the patient's chin are set to foreground white, and the rest are set to background black.

[0022] For the binarized image, breadth-first search is used to perform connected component analysis, identifying and labeling different connected components. The specific steps of breadth-first search are as follows:

[0023] 401. Create a tag matrix that matches the input image;

[0024] 402. Traverse the entire image, for each pixel (i,j):

[0025] S1. Create an empty queue Q and add the current pixel to queue Q;

[0026] S2. Create a new list of connected regions and add the current pixel to it;

[0027] S3. Mark the current pixel as visited;

[0028] S4. Repeat the following steps until queue Q is empty:

[0029] Step 1: Take a pixel (x, y) from queue Q;

[0030] Step 2: Traverse the eight neighboring pixels (x, y) (x+d) x ,y+d y ), of which (d x ,d y The values ​​are (-1,-1), (-1,0), (-1,1), (0,-1), (0,1), (1,-1), (1,0), (1,1);

[0031] Step 3: If an adjacent pixel (p, q) has not been visited and is the target pixel, add it to queue Q and add it to the connected component list;

[0032] Step 4: Mark the adjacent pixels (p, q) as visited;

[0033] S5. Save the list of currently connected regions;

[0034] 403. Finally, we obtain a list of all connected regions, each of which contains a set of adjacent pixels;

[0035] 404. For each connected region, calculate its centroid position as the location information of the laser reference point and marker point at the patient's subchinal point. The specific formula for calculating the centroid position is as follows:

[0036]

[0037]

[0038] Where, x i and yi Let x and y represent the x and y coordinates of each pixel in the connected region, respectively, and n represent the number of pixels in the connected region.

[0039] 405. Repeat step 404 above to calculate all connected regions and obtain the centroid position of each connected region as the position information of the laser reference point and marker point at the patient's subchinal point;

[0040] 406. In consecutive image frames, the laser tracking subunit and laser marking subunit in the laser path module use a Kalman filter to track and mark the movement trajectory of the marker points. The laser reference point at the patient's submental point detected in the first image frame is moved upwards by 2mm along the Y-axis and marked as the initial point y0. After the maxillary and mandibular occlusal bracket is placed in the patient's mouth, the marker point in the image is marked as the starting point A1, and the marker point in subsequent image frames is marked as A... i The coordinates are represented as A. i (x i ,y i ).

[0041] In a preferred embodiment, after the data processing module obtains the different position information of the marker points marked by the laser path module, it calculates the vertical movement distance of the marker points. The specific calculation formula and steps are as follows:

[0042] 501. Calculate the vertical distance the marker point moves, considering three cases:

[0043] S1. During the patient's biting process, there is no lateral deviation. In the vertical direction, the distance y from the marked point to the initial point y0 is within a certain range. i If -y0 < 0, it indicates the marker point is below the initial point y0. A threshold range is set where the distance between the marker point and the initial point y0 is 5 ≤ ​​|y0|. i When -y0|≤20mm, the control alarm emits a low-frequency beeping sound, and the distance between the marker point and the initial point y0 is within the range of 0<|y0|. i When -y0| < 5mm, the control alarm emits a high-frequency beeping sound. As the distance decreases, the beeping frequency increases, and the display shows the vertical distance y between the marker point and the initial point y0 in real time. i -y0, by prompting the doctor and patient with the distance to bite through the pitch of the audio and the real-time data on the display screen;

[0044] In the vertical direction, when the distance between the marker point and the initial point y0 is in the range of 0 ≤ y0, i When -y0≤1mm, the mark point is located above the initial point y0, and the prompt sound becomes a long beep, indicating that the doctor and patient have bitten into the correct position and should stop biting.

[0045] In the vertical direction, when the distance between the marker point and the initial point y0 is in the range of 1 < y i When -y0, the control alarm lights up and sounds an alarm to remind the doctor and patient that the current biting operation is not up to standard and exceeds the normal biting vertical distance, and to re-bite;

[0046] S2. When the patient deviates to the left or right during biting, a threshold range is set. When the single deviation distance does not exceed 2mm, the vertical movement distance of the marker point is calculated by calling S1 above.

[0047] S3. When the single offset distance of the marker exceeds 2mm, the control alarm will illuminate the warning light and emit a warning sound to remind the doctor and patient that the current occlusion operation is not up to standard and to repeat the occlusion. At the same time, the display screen will show the left and right offset distances of the marker in real time. If the marker offsets to the left by more than 2mm, the display screen will show the horizontal offset distance x. i If -x0 > 2, and the marker point shifts to the right by more than 2mm, the display screen will show the horizontal shift distance x. i -x0 < -2.

[0048] In a preferred embodiment, the intelligent measuring device comprises a headgear, a head fixing mechanism, an auxiliary support mechanism, and a lifting mechanism. The head fixing mechanism is located inside the headgear, and the two auxiliary support mechanisms are symmetrically distributed on both sides of the headgear with the axis of the headgear as the center of symmetry. The lifting mechanism is located in front of the headgear.

[0049] The inner wall of the headgear has an installation cavity. The head fixing mechanism includes a gear ring that slides on the inner wall of the installation cavity and a meshing gear that meshes with the gear ring. The inner top wall of the installation cavity is rotatably fitted with positioning rods arranged in a ring array. One end of the positioning rod passes through and extends to the upper surface of the headgear. The warning device is fixedly installed at the center of the upper surface of the headgear. The meshing gear is fixedly fitted to the other end of the positioning rod located in the installation cavity. A first arc-shaped electric telescopic rod is fixedly installed on the outer surface of the headgear. The telescopic end of the first arc-shaped electric telescopic rod is fixedly connected to the protruding end of the gear ring.

[0050] In a preferred embodiment, a rack meshes with the outer surface of the meshing gear, the rack being located below the gear ring. An arc-shaped fixing plate is fixedly connected to the lower surface of the rack, and an elastic sleeve is fixedly installed on the inner surface of the arc-shaped fixing plate. A first pressure sensor is fixedly installed at the center of the inner surface of the arc-shaped fixing plate, and the detection end of the first pressure sensor extends through the elastic sleeve to the inner arc-shaped surface of the elastic sleeve. A second pressure sensor is fixedly installed at the center of the inner top wall of the headgear, and a spring is fixedly installed on the inner top wall of the headgear near the outer side of the second pressure sensor. A positioning cap is fixedly connected to one end of the spring, and the top end of the positioning cap contacts the detection end of the second pressure sensor. The outer surfaces of the rack and the arc-shaped fixing plate are both slidably sleeved with the inner wall of the mounting cavity.

[0051] In a preferred embodiment, the auxiliary support mechanism includes a connecting plate and grippers mounted on the outer surface of the headgear. A first electric telescopic rod is fixedly mounted on the lower surface of the connecting plate. A first mounting block is fixedly mounted on the telescopic end of the first electric telescopic rod. A first worm gear driven by a motor is mounted at the center of the inner top wall of the first mounting block. One end of the first worm gear meshes with symmetrically distributed first worm wheels. A rotating rod is fixedly sleeved on the inner wall of the first worm wheels. After the rotating rod is rotated and sleeved on both sides of the bottom of the first mounting block, it is fixedly connected to the top of the grippers to achieve the gripping action on the patient's shoulder. A strain gauge is fixedly mounted on the inner surface of one of the grippers. Silicone pads are fixedly mounted on the inner surfaces of the remaining grippers and the inner surfaces of the strain gauges. A strain sensor electrically connected to the strain gauge is fixedly mounted on the outer surface of one of the grippers.

[0052] In a preferred embodiment, an arc-shaped groove is formed at the center of the front of the headgear. A second arc-shaped electric telescopic rod is fixedly installed on the inner wall of one side of the arc-shaped groove. The lifting mechanism includes a second electric telescopic rod that is slidably sleeved on the inner wall of the arc-shaped groove. One end of the piston rod of the second arc-shaped electric telescopic rod is fixedly connected to the outer surface of the second electric telescopic rod. A moving block is fixedly connected to the telescopic end of the second electric telescopic rod. The back of the moving block is slidably sleeved with the front of the headgear. A third electric telescopic rod is fixedly installed at the center of the lower surface of the front of the moving block. A second mounting block is fixedly installed at the telescopic end of the third electric telescopic rod. The laser projector is embedded in the center of the back of the second mounting block. The CMOS camera is fixedly installed at the lower end of the back of the second mounting block in an inclined position.

[0053] In a preferred embodiment, a second worm gear driven by a micro motor is fixedly mounted on the right side surface of the second mounting block. A groove is formed on the right side of the lower surface of the second mounting block. A bearing seat is fixedly mounted on the right side surface of the second mounting block near the inner top wall of the groove. A threaded rod is mounted at the axis of the bearing seat. A second worm wheel that meshes with the second worm gear is fixedly sleeved at the top end of the threaded rod. A guide sleeve is slidably sleeved on the inner wall of the groove. The inner wall of the guide sleeve is threadedly sleeved with the outer surface of the threaded rod. A measuring seat is fixedly mounted at the bottom end of the guide sleeve. The lower laser emitter is embedded on the back of the measuring seat. The laser emission projector and the lower laser emitter are located on the same axis. The intelligent measuring device is electrically connected to the control module.

[0054] The technical effects and advantages of this invention are as follows:

[0055] 1. This invention, by incorporating a laser emitting device, an image acquisition module, a laser path module, a data processing module, a control module, an alarm, and a display screen, enables real-time imaging of the movement trajectory of marked points on the patient's chin skin surface by a CMOS camera during biting. The image acquisition module preprocesses the acquired image data, and the laser path module, data processing module, control module, alarm, and display screen precisely measure the vertical distance of the patient's bite. Real-time data displayed on the screen, along with warning sounds and illuminated lights from the alarm, alert both the doctor and patient to the distance to be biting or whether a bite has failed, significantly reducing the doctor's technical sensitivity. Furthermore, the intelligent measuring device proposed in this application, through height and depth adjustment, solves the measurement error caused by different lip protrusions in planar measuring rulers, achieving personalized and precise measurements based on the facial features of different patients. Meanwhile, in the intelligent measurement device proposed in this application, the laser emitting device and camera are rigidly connected to the patient's head fixation device, that is, they are integrated with the patient's head, thus avoiding the measurement errors caused by unstable factors such as hand tremors during doctor's operation or involuntary head tremors in existing clinical split handheld devices.

[0056] 2. This invention, by setting up a head fixation mechanism and an auxiliary support mechanism, clamps the brow ridge and occipital bone plane of different patients according to their different head shapes, providing stable and flexible fixation, ensuring accurate positioning and posture, improving the accuracy of subsequent measurement results, and reducing patient discomfort during the measurement process.

[0057] 3. By setting up a lifting mechanism, this invention can precisely control the distance between the laser emitting device and the patient's face according to the differences in the height and width of the patient's head and face, avoiding unnecessary contact or discomfort caused by being too close, protecting the patient's safety and comfort, and thus providing more accurate conditions and comfort for subsequent measurements. Attached Figure Description

[0058] Figure 1 This is a system flowchart of the present invention;

[0059] Figure 2 This is a perspective view of the headgear structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention;

[0060] Figure 3 This is a perspective view of the mounting cavity structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention;

[0061] Figure 4 This is an exploded view of the headgear structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention.

[0062] Figure 5 This is a perspective view of the head fixing structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention.

[0063] Figure 6 This is a perspective view of the gripper structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention;

[0064] Figure 7 This is a perspective view of the first worm gear structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention.

[0065] Figure 8 This is a perspective view of the second worm gear structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention;

[0066] Figure 9 This is a three-dimensional view of the CMOS camera structure of an intelligent measuring device for measuring the vertical distance of complete dentures, as proposed in this invention.

[0067] Figure 10 This is a three-dimensional structural view of a laser emission projector for an intelligent measuring device used for measuring the vertical distance of complete dentures, as proposed in this invention.

[0068] Figure 11 This is a perspective view of the arc-shaped sliding groove structure of an intelligent measuring device for measuring the vertical distance of complete dentures proposed in this invention.

[0069] In the diagram: 1. Warning device; 2. Laser projector; 201. Lower laser emitter; 3. CMOS camera; 4. Headgear; 5. Mounting cavity; 6. Gear ring; 61. Meshing gear; 62. Positioning rod; 63. First arc-shaped electric telescopic rod; 64. Rack; 65. Arc-shaped fixing plate; 66. Elastic sleeve; 67. First pressure sensor; 68. Second pressure sensor; 69. Spring; 610. Positioning cap; 7. Connecting plate; 71. Gripper; 72. First electric telescopic rod; 73. First mounting block; 74. First worm gear; 75. First worm wheel; 76. Rotating rod; 77. Strain gauge; 78. Silicone pad; 79. Strain sensor; 8. Second electric telescopic rod; 81. Moving block; 82. Third electric telescopic rod; 83. Second mounting block; 84. Second worm gear; 85. Slide groove; 86. Bearing seat; 87. Threaded rod; 88. Second worm wheel; 89. Guide sleeve; 810. Measuring seat; 811. Arc-shaped slide groove; 812. Second arc-shaped electric telescopic rod. Detailed Implementation

[0070] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0071] Please see Figures 1-11 The present invention provides a technical solution: an intelligent measuring device for measuring the vertical distance of complete dentures, comprising a laser emitting device, an image acquisition module, a laser path module, a data processing module, a control module, an alarm 1, and a display screen;

[0072] Laser emitting device: The laser emitting projector 2 installed in front of the intelligent measuring device projects a laser midline onto the midline of the patient's face, and emits a laser reference point onto the skin surface at the submental point of the patient's chin along the laser midline. At the same time, the doctor marks a mark on the skin surface at the submental point of the patient's chin with a marker pen that is the same size as and coincides with the laser reference point.

[0073] Image acquisition module: First, the CMOS camera 3 installed in front of the intelligent measuring device acquires the laser reference point image data at the patient's submental point. Then, the doctor makes an occlusal bracket for the upper and lower jaws outside the mouth, places a softened wax strip of a certain height on the bracket, places the occlusal bracket in the patient's mouth, and instructs the patient to perform centric occlusion. The CMOS camera 3 installed in front of the intelligent measuring device acquires the movement image data of the marking points on the skin surface at the patient's submental point in real time during the occlusion process. The acquired image data is preprocessed and transmitted to the laser path module in the form of a two-dimensional image via wireless communication.

[0074] Laser path module: By acquiring image data sent by the image acquisition module, it extracts the position information of laser reference points and marker points in the image data, tracks and marks the movement trajectory of the marker points, and transmits the extracted position information and movement data of laser reference points and marker points to the data processing module via wireless communication;

[0075] Data processing module: Analyzes the position information of the laser reference point and the marker point and the movement data of the marker point sent by the image acquisition module, calculates the vertical movement distance of the marker point, and transmits the calculation results to the control module via wireless communication;

[0076] Control module: Processes the calculation results received from the data processing module, visualizes the calculation results on the display screen, reminds doctors and patients of the distance to be bitten, and controls the alarm 1 to work.

[0077] like Figure 1 As shown, after the laser emitting device projects a laser midline onto the patient's face using the laser emitting projector 2, a laser reference point is emitted onto the skin surface at the submental point of the patient's chin using the lower laser emitter 201 on this laser midline. When using the laser emitting device of this application, in order to ensure the accuracy of subsequent vertical distance measurements, the patient needs to sit upright, keep their head and neck straight, look straight ahead, and relax mentally, with their upper and lower lips gently closed. After the patient completes the above actions, the doctor marks a mark on the skin surface at the submental point of the patient's chin that is the same size as and coincides with the laser reference point.

[0078] First, the CMOS camera 3 installed in front of the intelligent measurement device acquires image data of the laser reference point at the patient's submental point. Then, the doctor uses a marker to make a mark of the same size and overlapping at the laser reference point at the submental point. Next, an occlusal support is fabricated outside the mouth, and a softened wax strip of a certain height is placed on the support. The occlusal support is then placed inside the patient's mouth, and the patient begins to bite. The CMOS camera 3 acquires real-time image data of the movement of the marked point on the skin surface at the submental point during the biting process. The image data is then preprocessed, and the specific preprocessing steps are as follows:

[0079] 301. Gamma correction is used to adjust the brightness and contrast of image data to correct image distortion caused by the nonlinearity of camera sensitivity, resulting in a corrected image. The specific formula is as follows:

[0080]

[0081] Where I represents the image brightness value, and IV represents the corrected brightness value. gamma Indicates the correction parameters;

[0082] 302. Histogram equalization is used to remap the brightness values ​​of the corrected image, enhancing the image contrast and making it more evenly distributed. The specific formula is as follows:

[0083]

[0084] Where T(p) represents the mapped luminance value, p represents the corrected grayscale value of the image, and p i L represents the probability value corresponding to gray level i in the normalized histogram, and L represents the gray level of the image.

[0085] 303. The image after histogram equalization is obtained as the final output and transmitted to the laser path module via wireless communication.

[0086] After acquiring the histogram-equalized image, the laser path module first enhances the features of the laser reference point and marker point at the patient's submental point in the histogram-equalized image using morphological operations, including erosion and dilation, to obtain the enhanced histogram-equalized image.

[0087] Secondly, repeated iterations are performed, and the current threshold is set. When the difference between the current threshold and the threshold of the previous iteration is less than a preset threshold, the iteration is stopped. The enhanced histogram equalization image is binarized. The binarization process determines the pixel values ​​in the threshold comparison image based on the iteration. The laser reference point and marker point at the patient's chin are set to the foreground white, and the rest is set to the background black.

[0088] For the binarized image, breadth-first search is used to perform connected component analysis, identifying and labeling different connected components. The specific steps of breadth-first search are as follows:

[0089] 401. To mark whether each pixel has been visited, create a marker matrix that matches the input image;

[0090] 402. Traverse the entire image. For each pixel (i,j), skip pixels that have already been marked as visited or are not target pixels.

[0091] S1. Create an empty queue Q and add the current pixel to queue Q;

[0092] S2. Create a new list of connected regions and add the current pixel to it;

[0093] S3. Mark the current pixel as visited;

[0094] S4. Repeat the following steps until queue Q is empty:

[0095] Step 1: Take a pixel (x, y) from queue Q;

[0096] Step 2: Traverse the eight neighboring pixels (x, y) (x+d) x ,y+d y ), of which (d x ,d y The values ​​are (-1,-1), (-1,0), (-1,1), (0,-1), (0,1), (1,-1), (1,0), (1,1);

[0097] Step 3: If an adjacent pixel (p, q) has not been visited and is the target pixel, add it to queue Q and add it to the connected component list;

[0098] Step 4: Mark adjacent pixels (p, q) as visited;

[0099] S5. Save the list of currently connected regions;

[0100] 403. Finally, we obtain a list of all connected regions, each of which contains a set of adjacent pixels;

[0101] 404. For each connected region, calculate its centroid position as the location information of the laser reference point and marker point at the patient's subchinal point. The specific formula for calculating the centroid position is as follows:

[0102]

[0103]

[0104] Where, x i and y i Let x and y represent the x and y coordinates of each pixel in the connected region, respectively, and n represent the number of pixels in the connected region.

[0105] 405. Repeat step 404 above to calculate all connected regions and obtain the centroid position of each connected region as the position information of the laser reference point and marker point at the patient's subchinal point;

[0106] 406. In consecutive image frames, the laser tracking subunit and laser marking subunit in the laser path module use a Kalman filter to track and mark the movement trajectory of the marker points. The laser reference point at the patient's submental point detected in the first image frame is moved upwards by 2mm along the Y-axis and marked as the initial point y0. After the maxillary and mandibular occlusal bracket is placed in the patient's mouth, the marker point in the image is marked as the starting point A1, and the marker point in subsequent image frames is marked as A... i The coordinates are represented as A. i (x i ,y i ).

[0107] After the data processing module obtains the position information of the marker points marked by the laser path module at different positions, it calculates the vertical movement distance of the marker points. The specific calculation formula and steps are as follows:

[0108] 501. Calculate the vertical distance the marker point moves, considering three cases:

[0109] S1. During the patient's biting process, there is no lateral deviation. In the vertical direction, the distance y from the marked point to the initial point y0 is within a certain range. i If -y0 < 0, it indicates the marker point is below the initial point y0. A threshold range is set where the distance between the marker point and the initial point y0 is 5 ≤ ​​|y0|. i When -y0|≤20mm, the control alarm 1 emits a low-frequency beeping sound, and the distance between the marker point and the initial point y0 is within the range of 0<|y0|. i When -y0| < 5mm, the control alarm 1 emits a high-frequency beeping sound. As the distance decreases, the frequency of the beeping sound increases. At the same time, the display screen shows the vertical distance y between the marker point and the initial point y0 in real time. i -y0, by prompting the doctor and patient with the distance to bite through the pitch of the audio and the real-time data on the display screen;

[0110] In the vertical direction, when the distance between the marker point and the initial point y0 is in the range of 0 ≤ y i When -y0≤1mm, the mark point is located above the initial point y0, and the prompt sound becomes a long beep, indicating that the doctor and patient have bitten into the correct position and should stop biting.

[0111] In the vertical direction, when the distance between the marker point and the initial point y0 is in the range of 1 < y i When -y0, the control alarm 1 illuminates the warning light and emits a warning sound to remind the doctor and patient that the current biting operation is not up to standard and exceeds the normal biting vertical distance, and to re-bite.

[0112] S2. When the patient deviates to the left or right during biting, a threshold range is set. When the single deviation distance does not exceed 2mm, the vertical movement distance of the marker point is calculated by calling S1 above.

[0113] S3. When the single offset distance of the marker point exceeds 2mm, the control alarm 1 illuminates the warning light and emits a warning sound to remind the doctor and patient that the current occlusion operation is unqualified and to re-occlude. At the same time, the display screen shows the left and right offset distances of the marker point in real time. If the marker point offsets to the left by more than 2mm, the display screen shows the horizontal offset distance x. i If -x0 > 2, and the marker point shifts to the right by more than 2mm, the display screen will show the horizontal shift distance x. i -x0 < -2.

[0114] By incorporating a laser emitting device, an image acquisition module, a laser path module, a data processing module, a control module, an alarm device 1, and a display screen, the device enables real-time imaging of the movement trajectory of marked points on the patient's chin skin surface by a CMOS camera 3 during biting. The image acquisition module preprocesses the acquired image data, and the laser path module, data processing module, control module, alarm device 1, and display screen are then used to accurately measure the vertical distance of the patient's bite. Real-time data displayed on the screen, along with warning sounds and lights from the alarm device 1, alert both the doctor and patient to the distance to be biting or whether a bite has failed, significantly reducing the doctor's sensitivity to technical limitations. Furthermore, the intelligent measuring device proposed in this application, through height and depth adjustments, solves the measurement errors caused by different lip protrusions in planar measuring rulers, achieving personalized and accurate measurements based on the facial features of different patients. Meanwhile, in the intelligent measurement device proposed in this application, the laser emitting device and camera are rigidly connected to the patient's head fixation device, that is, they are integrated with the patient's head, thus avoiding the measurement errors caused by unstable factors such as hand tremors during doctor's operation or involuntary head tremors in existing clinical split handheld devices.

[0115] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the intelligent measuring device consists of a head cover 4, a head fixing mechanism, an auxiliary support mechanism, and a lifting mechanism. The head fixing mechanism is located inside the head cover 4. The two auxiliary support mechanisms are symmetrically distributed on both sides of the head cover 4 with the axis of the head cover 4 as the center of symmetry. The lifting mechanism is located in front of the head cover 4.

[0116] The inner wall of the headgear 4 has an installation cavity 5. The head fixing mechanism includes a gear ring 6 that slides on the inner wall of the installation cavity 5 and a meshing gear 61 that meshes with the gear ring 6. The inner top wall of the installation cavity 5 is rotatably fitted with positioning rods 62 arranged in a ring array. One end of the positioning rod 62 passes through and extends to the upper surface of the headgear 4. The warning device 1 is fixedly installed at the center of the upper surface of the headgear 4. The meshing gear 61 is fixedly fitted on the other end of the positioning rod 62 located in the installation cavity 5. A first arc-shaped electric telescopic rod 63 is fixedly installed on the outer surface of the headgear 4. The telescopic end of the first arc-shaped electric telescopic rod 63 is fixedly connected to the protruding end of the gear ring 6. The first arc-shaped electric telescopic rod 63 provides a power source input to the head fixing mechanism, which facilitates clamping and fixing the heads of different patients.

[0117] A rack 64 meshes with the outer surface of the meshing gear 61. The rack 64 is located below the gear ring 6. An arc-shaped fixing plate 65 is fixedly connected to the lower surface of the rack 64. The first arc-shaped electric telescopic rod 63 of the head fixing mechanism retracts, causing the gear ring 6 to mesh with the meshing gear 61 in the mounting cavity 5. As the meshing gear 61 rotates, it causes the rack 64 and the arc-shaped fixing plate 65 to retract along the radial direction of the mounting cavity 5, clamping the patient's head at the brow ridge and occipital bone plane. An elastic sleeve 66 is fixedly installed on the inner surface of the arc-shaped fixing plate 65. The elastic sleeve 66 is made of silicone and has a spring-loaded design. The elastic sleeve 66 provides flexible contact between the curved fixing plate 65 and the brow ridge-occipital bone plane of the patient's head, preventing the curved fixing plate 65 from pinching the patient's head. A first pressure sensor 67 is fixedly installed at the center of the inner surface of the curved fixing plate 65. The detection end of the first pressure sensor 67 passes through the elastic sleeve 66 and extends to the inner curved surface of the elastic sleeve 66. The first pressure sensor 67 is set to detect the clamping force applied by the curved fixing plate 65 to the patient's head in real time. When the clamping force reaches the set value, the first curved electric telescopic rod 63 is controlled to stop retracting. The laser emitting device and lifting mechanism are activated. A second pressure sensor 68 is fixedly installed at the center of the inner top wall of the headgear 4. A spring 69 is fixedly installed on the inner top wall of the headgear 4 near the outer side of the second pressure sensor 68. One end of the spring 69 is fixedly connected to a positioning cap 610. The top of the positioning cap 610 contacts the detection end of the second pressure sensor 68. The patient sits upright, keeping their head and neck straight, their eyes looking straight ahead, and their mind relaxed. Their upper and lower lips are gently closed. The doctor puts the headgear 4 on the patient's head, and the patient's head contacts the positioning cap 610. At this time, due to the different brow ridges of different patients... Due to the difference in distance from the occipital plane to the top of the head, and the fact that female patients have much thicker hair than male patients, in order to ensure the accuracy of subsequent measurements, under the action of the weight of the intelligent measuring device itself, the spring 69 connected to the upper surface of the positioning cap 610 begins to contract under force. The top of the positioning cap 610 contacts the detection end of the second pressure sensor 68. When the pressure value reaches the preset value, the pressure value signal is fed back to the control module in real time. After receiving the signal, the control module controls the auxiliary support mechanism to start, and the outer surfaces of the rack 64 and the arc-shaped fixing plate 65 are slidably sleeved with the inner wall of the mounting cavity 5.

[0118] like Figure 2 , Figure 6 and Figure 7As shown, the auxiliary support mechanism includes a connecting plate 7 and a gripper 71 mounted on the outer surface of the headgear 4. A first electric telescopic rod 72 is fixedly mounted on the lower surface of the connecting plate 7. A first mounting block 73 is fixedly mounted on the telescopic end of the first electric telescopic rod 72. A first worm gear 74 driven by a motor is mounted at the center of the inner top wall of the first mounting block 73. One end of the first worm gear 74 is engaged with a symmetrically distributed first worm wheel 75. A rotating rod 76 is fixedly sleeved on the inner wall of the first worm wheel 75. After the rotating rod 76 is rotated and sleeved on both sides of the bottom of the first mounting block 73, it is fixedly connected to the top of the gripper 71 to achieve the clamping action on the patient's shoulder. When the first electric telescopic rod 72 extends, it drives the first mounting block 73 and the mechanical structure mounted on the first mounting block 73 to move downward along the height direction of the first electric telescopic rod 72. Through the cooperation of the first electric telescopic rod 72 and the second pressure sensor 68, the first worm gear driven by the motor is controlled. 74 engages with the first worm gear 75, driving the gripper 71 to clamp the patient's shoulder. A strain gauge 77 is fixedly installed on the inner surface of one of the grippers 71, and silicone pads 78 are fixedly installed on the inner surfaces of the other grippers 71 and the inner surfaces of the strain gauges 77. The silicone pads 78 provide flexible contact between the gripper 71 and the patient's shoulder, preventing the gripper 71 from causing injury to the patient's shoulder. A strain sensor 79, electrically connected to the strain gauge 77, is fixedly installed on the outer surface of one of the grippers 71. Through the cooperation of the strain sensor 79 and the strain gauge 77, the force applied by the gripper 71 to the patient's shoulder is detected. A first pressure sensor 67 is set to detect the clamping force applied by the arc-shaped fixing plate 65 to the patient's head in real time. When the clamping force reaches the set value, the first arc-shaped electric telescopic rod 63 is controlled to stop retracting, and the auxiliary support mechanism is reset to its initial state.

[0119] By setting up a head fixation mechanism and an auxiliary support mechanism, clamping is achieved at the brow ridge and occipital bone plane of different patients according to their different head shapes, providing stable and flexible fixation, ensuring accurate positioning and posture, improving the accuracy of subsequent measurement results, and reducing patient discomfort during the measurement process.

[0120] like Figure 2 , Figure 3 , Figure 8 , Figure 9 , Figure 10 and Figure 11As shown, an arc-shaped groove 811 is provided at the center of the front of the headgear 4. A second arc-shaped electric telescopic rod 812 is fixedly installed on the inner wall of one side of the arc-shaped groove 811. The lifting mechanism includes a second electric telescopic rod 812 that is slidably sleeved on the inner wall of the arc-shaped groove 811. One end of the piston rod of the second arc-shaped electric telescopic rod 812 is fixedly connected to the outer surface of the second electric telescopic rod. A moving block 81 is fixedly connected to the telescopic end of the second electric telescopic rod 812. The back of the moving block 81 is slidably sleeved with the front of the headgear 4. When the second electric telescopic rod 812 extends, it drives the moving block 81 and the moving block 81 installed on the inner wall of the headgear 4. The mechanical structure on the movable block 81 moves horizontally along the length of the second electric telescopic rod 8. A third electric telescopic rod 82 is fixedly installed at the center of the lower front surface of the movable block 81. A second mounting block 83 is fixedly installed at the telescopic end of the third electric telescopic rod 82. When the third electric telescopic rod 82 extends, it drives the second mounting block 83 to move horizontally along the height of the third electric telescopic rod 82. The laser projector 2 is embedded in the center of the back of the second mounting block 83. The CMOS camera 3 is fixedly installed at the lower back of the second mounting block 83 in an inclined position.

[0121] like Figure 2 , Figure 3 , Figure 8 , Figure 9 and Figure 10As shown, a second worm gear 84 driven by a micro motor is fixedly mounted on the right side surface of the second mounting block 83. A groove 85 is formed on the right side of the lower surface of the second mounting block 83. A bearing seat 86 is fixedly mounted on the right side surface of the second mounting block 83 near the inner top wall of the groove 85. A threaded rod 87 is mounted at the axis of the bearing seat 86. A second worm wheel 88 that meshes with the second worm gear 84 is fixedly sleeved at the top end of the threaded rod 87. A guide sleeve 89 is slidably sleeved on the inner wall of the groove 85. The inner wall of the guide sleeve 89 is threadedly sleeved with the outer surface of the threaded rod 87. A measuring seat 810 is fixedly mounted on the bottom end of the guide sleeve 89. The control module controls the micro motor to drive the second worm gear 84 to mesh with the second worm wheel 88, causing the threaded rod 87 to rotate around the axis of the second worm wheel 88. Through the threaded engagement of the threaded rod 87 with the guide sleeve 89, the guide sleeve 89 is driven... The measuring base 810 moves downward along the height direction of the second mounting block 83. The lower laser emitter 201 is embedded in the back of the measuring base 810. The laser projector 2 and the lower laser emitter 201 are located on the same axis. The intelligent measuring device is electrically connected to the control module. Due to the differences in the heads of different patients, the distance from the lifting mechanism to the patient's face is adjusted in the front-back direction by extending and retracting the second electric telescopic rod 8. The height of the laser midline position projected by the laser projector 2 onto the midline of the patient's face is adjusted by extending and retracting the third electric telescopic rod 82. The position of the laser point irradiated by the lower laser emitter 201 on the midline of the patient's face is adjusted by the cooperation of the worm gear, worm wheel, threaded rod 87 and guide sleeve 89, thereby making the measurement results of the intelligent measuring device of this application more accurate.

[0122] By setting up a lifting mechanism, the distance between the laser emitter and the patient's face can be precisely controlled according to the differences in the height and width of the patient's head and face. This avoids unnecessary contact or discomfort caused by being too close, protects the patient's safety and comfort, and provides more accurate conditions and comfort for subsequent measurements.

[0123] The aforementioned intelligent measuring device, while ensuring normal operation, preferably adopts a lightweight design and preferably uses high-strength alloy materials. At the same time, in order to prevent the appearance of the intelligent measuring device from causing panic among patients, it is preferable to coat the surface of the intelligent measuring device with a solid color.

[0124] Working principle of intelligent measuring equipment: Step 1, the patient sits upright, keeping the head and neck straight, looking straight ahead and relaxed, with the upper and lower lips gently closed. The doctor puts the headgear 4 on the patient's head, and the patient's head contacts the positioning cap 610. At this time, due to the difference in the distance from the brow ridge occipital bone plane to the top of the head among different patients, and the fact that female patients have much thicker hair than male patients, in order to ensure the accuracy of subsequent measurements, under the action of the intelligent measuring equipment's own gravity, the spring 69 connected to the upper surface of the positioning cap 610 begins to contract under force. The top of the positioning cap 610 contacts the detection end of the second pressure sensor 68. When the pressure value reaches the preset value, the pressure value signal is fed back to the control module in real time. After receiving the signal, the control module controls the auxiliary support mechanism to start.

[0125] Step two: The first electric telescopic rod 72 of the auxiliary support mechanism extends, driving the first mounting block 73 and the mechanical structure mounted on the first mounting block 73 to move downward along the height direction of the first electric telescopic rod 72. Through the cooperation of the first electric telescopic rod 72 and the second pressure sensor 68, the first worm gear 74 driven by the motor is controlled to mesh with the first worm wheel 75, driving the gripper 71 to perform a gripping action on the patient's shoulder. A silicone pad 78 is set to achieve flexible contact between the gripper 71 and the patient's shoulder, avoiding the gripper 71 from causing injury to the patient's shoulder. Through the cooperation of the strain sensor 79 and the strain gauge 77, the force applied by the gripper 71 to the patient's shoulder is detected. After the auxiliary support mechanism completes the gripping of the patient's shoulder, the head fixation mechanism is activated.

[0126] Step 3: The first arc-shaped electric telescopic rod 63 of the head fixation mechanism retracts, driving the gear ring 6 to mesh with the meshing gear 61 in the mounting cavity 5. As the meshing gear 61 rotates, it drives the rack 64 and the arc-shaped fixing plate 65 to retract along the radial direction of the mounting cavity 5, clamping the brow ridge and occipital bone plane of the patient's head. An elastic sleeve 66 is set to achieve flexible contact between the arc-shaped fixing plate 65 and the contact surface of the brow ridge and occipital bone plane of the patient's head, avoiding the arc-shaped fixing plate 65 from causing pinching injury to the patient's head. A first pressure sensor 67 is set to detect the clamping force applied by the arc-shaped fixing plate 65 to the patient's head in real time. When the clamping force reaches the set value, the first arc-shaped electric telescopic rod 63 is controlled to stop retracting, the auxiliary support mechanism is reset and returned to the initial state, and the laser emitting device and the lifting mechanism are started.

[0127] Step four: Before using the laser emission device, due to differences in the height and width of different patients' heads and faces, the second arc-shaped electric telescopic rod 812 is extended, causing the second electric telescopic rod 8 to rotate in an arc around the axis of the headgear 4. The extension of the second electric telescopic rod 8 causes the moving block 81 and the mechanical structure mounted on the moving block 81 to move horizontally along the length of the second electric telescopic rod 8. The third electric telescopic rod 82 extends, causing the second mounting block 83 to move horizontally along the height of the third electric telescopic rod 82. The second worm gear 84, driven by a micro-motor, meshes with the second worm wheel 88, causing the threaded rod 87 to rotate around the axis of the second worm wheel 88. This rotation is achieved through the threaded sleeve of the threaded rod 87 and the guide sleeve 89. Next, the guide sleeve 89 and the measuring seat 810 move downward along the height direction of the second mounting block 83. Through the extension and retraction of the second arc-shaped electric telescopic rod 812, the laser midline of the laser surface irradiated by the laser emitting device on the patient's face is adjusted left and right. Through the extension and retraction of the second electric telescopic rod 812, the distance between the lifting mechanism and the patient's face is adjusted in the front and back direction. Through the extension and retraction of the third electric telescopic rod 82, the position of the laser midline projected by the laser emitting projector 2 onto the midline of the patient's face is adjusted. Through the cooperation of the worm gear, worm wheel, threaded rod 87 and guide sleeve 89, the position of the laser point irradiated by the lower laser emitter 201 on the midline of the patient's face is adjusted.

[0128] With the cooperation of the above-mentioned lifting mechanism, a laser emitting device is used to project a laser midline onto the midline of the patient's face through the laser emitting projector 2. On this laser midline, a laser reference point is emitted onto the skin surface at the submental point of the patient's chin using the lower laser emitter 201 in the laser emitting device. At the same time, on the skin surface at the submental point of the patient's chin, the doctor marks a mark that is the same size as and coincides with the laser reference point with a marker pen.

[0129] Step 5: Using the CMOS camera 3 installed in front of the intelligent measuring device, the laser reference point image data at the patient's submental point is acquired. Next, the doctor makes an equal-sized and overlapping mark at the laser reference point at the submental point with a marker pen. Then, an occlusal support is made outside the mouth, and a softened wax strip of a certain height is placed on the occlusal support. The occlusal support is then placed inside the patient's mouth, and the patient begins to bite. The CMOS camera 3 acquires real-time image data of the movement of the marked point on the skin surface at the submental point of the patient during the biting process. The acquired image data is preprocessed, and the laser path module, data processing module, control module, alarm 1, and display screen are invoked to measure the vertical distance of the patient's bite. The doctor is reminded of the distance to be bitten or whether the bite has failed by setting the alarm sound emitted by the display screen and alarm 1.

[0130] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0131] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent measuring device for measuring the vertical distance of complete dentures, characterized in that: It includes a laser emitting device, an image acquisition module, a laser path module, a data processing module, a control module, an alarm (1), a display screen, and an intelligent measuring device. The intelligent measuring device consists of a headgear (4), a head fixing mechanism, an auxiliary support mechanism, and a lifting mechanism. Laser emitting device: A laser midline is projected onto the midline of the patient's face by a laser emitting projector (2) installed in front of the intelligent measuring device. A laser reference point is emitted onto the skin surface at the submental point of the patient's chin along the laser midline. At the same time, the doctor marks a mark on the skin surface at the submental point of the patient's chin with a marker pen that is the same size as and coincides with the laser reference point. Image acquisition module: First, the CMOS camera (3) installed in front of the intelligent measuring device is used to acquire the laser reference point image data at the patient's submental point. Then, the doctor makes a jaw support for the upper and lower jaws outside the mouth, places a soft wax strip of a certain height on the jaw support, places the jaw support for the upper and lower jaws in the patient's mouth, and instructs the patient to perform centric occlusion. The CMOS camera (3) installed in front of the intelligent measuring device is used to acquire the movement image data of the marking points on the skin surface at the patient's submental point in real time during the occlusion process. The acquired image data is preprocessed and the preprocessed image data is transmitted to the laser path module in the form of a two-dimensional image via wireless communication. Laser path module: By acquiring image data sent by the image acquisition module, it extracts the position information of laser reference points and marker points in the image data, tracks and marks the movement trajectory of the marker points, and transmits the extracted position information of laser reference points and marker points and the movement data of marker points to the data processing module through wireless communication; Data processing module: Analyzes the position information of the laser reference point and the marker point and the movement data of the marker point sent by the image acquisition module, calculates the vertical movement distance of the marker point, and transmits the calculation results to the control module via wireless communication; Control module: Processes the calculation results received from the data processing module, visualizes the calculation results on the display screen, reminds doctors and patients of the distance to be bitten, and controls the alarm (1) to work.

2. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 1, characterized in that: After the laser emitting device projects a laser midline onto the midline of the patient's face using a laser emitting projector (2), a laser reference point is emitted onto the skin surface at the submental point of the patient's chin using the lower laser emitter (201) on the laser midline. At the same time, the doctor marks a mark on the skin surface at the submental point of the patient's chin with a marker pen that is the same size as and coincides with the laser reference point.

3. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 2, characterized in that: First, the CMOS camera (3) installed in front of the intelligent measuring device is used to collect the laser reference point image data at the patient's submental point. Then, the doctor uses a marker to make a mark of the same size and overlapping at the laser reference point at the submental point. Then, a jaw support is made outside the mouth. A soft wax strip of a certain height is placed on the jaw support. Then, the jaw support is placed in the patient's mouth. The patient begins to bite. The CMOS camera (3) is used to collect the image data of the movement of the mark point on the skin surface at the submental point of the patient in real time during the biting process. The image data is preprocessed. The specific steps of the preprocessing are as follows:

301. Gamma correction is used to adjust the brightness and contrast of image data to obtain the corrected image. The specific formula is as follows: in, Indicates the image brightness value. This indicates the corrected brightness value. Indicates the correction parameters; 302. The brightness values ​​of the corrected image are remapped using histogram equalization. The specific formula is as follows: in, This represents the mapped brightness value. This represents the grayscale value of the corrected image. This represents the gray levels in the normalized histogram. The corresponding probability value, Indicates the grayscale level of the image; 303. The image after histogram equalization is obtained as the final output and transmitted to the laser path module via wireless communication.

4. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 3, characterized in that: After acquiring the histogram-equalized image, the laser path module first enhances the features of the laser reference point and marker point at the patient's submental point in the histogram-equalized image using morphological operations, including erosion and dilation, to obtain the enhanced histogram-equalized image. Secondly, repeated iterations are performed, and a current threshold is set. When the difference between the current threshold and the threshold of the previous iteration is less than a preset threshold, the iteration stops. The enhanced histogram equalization image is binarized. The binarization process determines the pixel values ​​in the threshold comparison image based on the iteration. The laser reference point and marker point at the patient's chin are set to foreground white, and the rest are set to background black. For the binarized image, breadth-first search is used to perform connected component analysis, identifying and labeling different connected components. The specific steps of breadth-first search are as follows:

401. Create a tag matrix that matches the input image; 402. Traverse the entire image, for each pixel... : S1. Create an empty queue. And add the current pixel to the queue. ; S2. Create a new list of connected regions and add the current pixel to it; S3. Mark the current pixel as visited; S4. Repeat the following steps until the queue is full. Empty: Step 1, from the queue Extract a pixel ; Step 2, Traverse Eight adjacent pixels ,in for ; Step 3, adjacent pixels If a pixel has not been accessed and is the target pixel, add it to the queue. And add it to the list of connected components; Step 4: Mark adjacent pixels Visited; S5. Save the list of currently connected regions; 403. Finally, we obtain a list of all connected regions, each of which contains a set of adjacent pixels; 404. For each connected region, calculate its centroid position as the location information of the laser reference point and marker point at the patient's subchinal point. The specific formula for calculating the centroid position is as follows: in, Each pixel in the connected region represents a point in the connected region. coordinates and coordinate, This represents the number of pixels in a connected region.

405. Repeat step 404 above to calculate all connected regions and obtain the centroid position of each connected region as the position information of the laser reference point and marker point at the patient's subchinal point; 406. In consecutive image frames, the laser tracking subunit and laser marking subunit in the laser path module use a Kalman filter to track and mark the movement trajectory of the marker points. The laser reference point at the patient's subchinar point detected in the first frame image is moved upwards by 2mm along the Y-axis and marked as the initial point. After the maxillary and mandibular occlusal brackets were placed in the patient's mouth, the marked points in the image were used as the starting points. The marker points in subsequent image frames are marked as The coordinates are represented as .

5. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 4, characterized in that: After obtaining the different position information of the marker points marked by the laser path module, the data processing module calculates the vertical movement distance of the marker points. The specific calculation formula and steps are as follows:

501. Calculate the vertical distance the marker point moves, considering three cases: S1. During the biting process, the patient does not deviate to the left or right. In the vertical direction, the distance from the initial point is measured using the marked points. Distance range Determine if the marker point is located at the initial point. Below, a threshold range is set; when the marker point is far from the initial point... The distance range is When mm, the control alarm (1) emits a low-frequency beeping sound, and the mark point is a certain distance from the initial point. The distance range is When the distance is mm, the control alarm (1) emits a high-frequency beeping sound. As the distance decreases, the frequency of the sound increases, and the display screen shows the mark point and the initial point in real time. vertical distance It reminds doctors and patients of the distance to bite by indicating the pitch of the audio and real-time data on the display screen; In the vertical direction, when the mark point is far from the initial point The distance range is When mm, the marker point is located at the initial point. Above, the beeping sound turns into a long beep, indicating to the doctor and patient that they have bitten into the correct position and should stop biting. In the vertical direction, when the mark point is far from the initial point The distance range is When the time comes, the control alarm (1) will light up the warning light and make a warning sound to remind the doctor and patient that the current biting operation is not up to standard and exceeds the normal biting vertical distance, and to bite again; S2. When the patient deviates to the left or right during biting, a threshold range is set. When the horizontal deviation distance in a single instance does not exceed 2mm, the vertical movement distance of the marker point is calculated by calling S1 above. S3. When the single offset distance of the marker point exceeds 2mm, the control alarm (1) will light up the warning light and emit a warning sound to remind the doctor and patient that the current biting operation is not qualified and to re-bite. At the same time, the display screen will show the left and right offset distance of the marker point in real time. If the marker point is offset to the left by more than 2mm, the display screen will show the horizontal offset distance. If the marker point shifts to the right by more than 2mm, the display screen will show the horizontal shift distance. .

6. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 5, characterized in that: The head fixing mechanism is located inside the head cover (4), and the two auxiliary support mechanisms are symmetrically distributed on both sides of the head cover (4) with the axis of the head cover (4) as the center of symmetry. The lifting mechanism is located in front of the head cover (4). The inner wall of the headgear (4) is provided with an installation cavity (5). The head fixing mechanism includes a gear ring (6) that is slidably sleeved on the inner wall of the installation cavity (5) and a meshing gear (61) that meshes with the gear ring (6). The inner top wall of the installation cavity (5) is rotatably sleeved with positioning rods (62) arranged in a ring array. One end of the positioning rod (62) penetrates and extends to the upper surface of the headgear (4). The warning device (1) is fixedly installed at the center of the upper surface of the headgear (4). The meshing gear (61) is fixedly sleeved on the other end of the positioning rod (62) located in the installation cavity (5). A first arc-shaped electric telescopic rod (63) is fixedly installed on the outer surface of the headgear (4). The telescopic end of the first arc-shaped electric telescopic rod (63) is fixedly connected to the protruding end of the gear ring (6).

7. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 6, characterized in that: The outer surface of the meshing gear (61) is meshed with a rack (64), which is located below the gear ring (6). An arc-shaped fixing plate (65) is fixedly connected to the lower surface of the rack (64). An elastic sleeve (66) is fixedly installed on the inner surface of the arc-shaped fixing plate (65). A first pressure sensor (67) is fixedly installed at the center of the inner surface of the arc-shaped fixing plate (65). The detection end of the first pressure sensor (67) passes through the elastic sleeve (66) and extends to the elastic sleeve (66). The inner arc-shaped surface of the headgear (4) has a second pressure sensor (68) fixedly installed at the center of the inner top wall. A spring (69) is fixedly installed on the inner top wall of the headgear (4) near the outer side of the second pressure sensor (68). A positioning cap (610) is fixedly connected to one end of the spring (69). The top of the positioning cap (610) is in contact with the detection end of the second pressure sensor (68). The outer surfaces of the rack (64) and the arc-shaped fixing plate (65) are slidably sleeved with the inner wall of the mounting cavity (5).

8. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 7, characterized in that: The auxiliary support mechanism includes a connecting plate (7) and a gripper (71) installed on the outer surface of the headgear (4). A first electric telescopic rod (72) is fixedly installed on the lower surface of the connecting plate (7). A first mounting block (73) is fixedly installed on the telescopic end of the first electric telescopic rod (72). A first worm gear (74) driven by a motor is installed at the center of the inner top wall of the first mounting block (73). One end of the first worm gear (74) is engaged with a symmetrically distributed first worm wheel (75). The inner wall of the first worm wheel (75) is fixedly sleeved. There is a rotating rod (76), which is rotated and sleeved on both sides of the bottom of the first mounting block (73) and then fixedly connected to the top of the gripper (71) to realize the gripping action on the patient's shoulder. A strain gauge (77) is fixedly installed on the inner surface of one of the grippers (71), and silicone pads (78) are fixedly installed on the inner surfaces of the other grippers (71) and the inner surfaces of the strain gauges (77). A strain sensor (79) electrically connected to the strain gauge (77) is fixedly installed on the outer surface of one of the grippers (71).

9. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 8, characterized in that: The headgear (4) has an arc-shaped groove (811) at the center of the front. A second arc-shaped electric telescopic rod (812) is fixedly installed on the inner wall of one side of the arc-shaped groove (811). The lifting mechanism includes a second electric telescopic rod (8) that is slidably sleeved on the inner wall of the arc-shaped groove (811). One end of the piston rod of the second arc-shaped electric telescopic rod (812) is fixedly connected to the outer surface of the second electric telescopic rod. A moving block (81) is fixedly connected to the telescopic end of the second electric telescopic rod (8). The back of the moving block (81) is slidably sleeved on the front of the headgear (4). A third electric telescopic rod (82) is fixedly installed at the center of the lower surface of the front of the moving block (81). A second mounting block (83) is fixedly installed at the telescopic end of the third electric telescopic rod (82). The laser projector (2) is embedded in the center of the back of the second mounting block (83). The CMOS camera (3) is fixedly installed at the lower back of the second mounting block (83) in an inclined position.

10. The intelligent measuring device for measuring the vertical distance of complete dentures according to claim 9, characterized in that: A second worm gear (84) driven by a micro motor is fixedly installed on the right side surface of the second mounting block (83). A groove (85) is opened on the right side of the lower surface of the second mounting block (83). A bearing seat (86) is fixedly installed on the right side surface of the second mounting block (83) near the inner top wall of the groove (85). A threaded rod (87) is installed at the axis of the bearing seat (86). A second worm wheel (88) that meshes with the second worm gear (84) is fixedly sleeved at the top end of the threaded rod (87). A guide sleeve (89) is slidably sleeved on the inner wall of the groove (85). The inner wall of the guide sleeve (89) is threadedly sleeved with the outer surface of the threaded rod (87). A measuring seat (810) is fixedly installed at the bottom end of the guide sleeve (89). The lower laser emitter (201) is embedded in the back of the measuring seat (810). The laser projector (2) and the lower laser emitter (201) are located on the same axis. The intelligent measuring device is electrically connected to the control module.

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