Stripe brightness adjusting method and medical scanning equipment thereof

Abstract

The invention provides a stripe brightness adjusting method and medical scanning equipment thereof. The stripe brightness adjusting method is applied to the medical scanning equipment for projecting detection stripes to a target object. The stripe brightness adjusting method comprises the steps of obtaining a stripe pattern reflected by the target object, adjusting the medical scanning equipment by utilizing a plurality of brightness setting rules so as to respectively obtain a plurality of acquisition brightness values of the stripe pattern, and generating a brightness index lookup table according to the change trend of the plurality of acquisition brightness values, obtaining a brightness setting parameter from the brightness index lookup table according to the first representative brightness value of the stripe pattern, adjusting the medical scanning equipment by utilizing the brightness setting parameter to obtain a second representative brightness value of the stripe pattern, and converting the stripe pattern into a three-dimensional contour of the target object when judging that the second representative brightness value accords with a preset brightness range.

Description

Technical Field

[0001] The present invention relates to a method for adjusting stripe brightness and a medical scanning device thereof, and particularly to a method for adjusting stripe brightness and a medical scanning device thereof that can improve scanning quality and efficiency. Background Art

[0002] Traditional digital oral scanners include an illumination unit, a scanning unit, and a processing unit. Since it is difficult for external illumination light to project into the patient's oral cavity, traditional digital oral scanners use an illumination unit to provide stable illumination light to project onto the teeth; the scanning unit obtains a stripe pattern from the teeth and hands it over to the processing unit for analysis to calculate a three-dimensional model of the teeth. However, the stripe pattern is easily affected by the color and material characteristics of the tooth surface. For example, if there are food residues, dental plaque, or cavities on the teeth, it will cause uneven brightness distribution of the stripe pattern, thereby reducing the accuracy of the three-dimensional model of the teeth established by the processing unit.

[0003] Therefore, it is necessary to design a new method for adjusting stripe brightness and a medical scanning device thereof to overcome the above defects. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for adjusting stripe brightness and a medical scanning device thereof, which can quickly adjust the brightness setting parameters of the medical scanning device by first establishing a brightness index lookup table, so as to obtain clear and accurate detection results.

[0005] To achieve the above object, the present invention provides a method for adjusting stripe brightness, which is applied to a medical scanning device that projects a detection stripe onto a target object. The method for adjusting stripe brightness includes: obtaining a stripe pattern reflected by the target object; adjusting the medical scanning device by using a plurality of brightness setting rules to respectively obtain a plurality of acquisition brightness values of the stripe pattern; generating a brightness index lookup table according to the change trend of the plurality of acquisition brightness values; calculating a first representative brightness value of the stripe pattern after filtering out surrounding noise; obtaining a brightness setting parameter according to the index value of the first representative brightness value in the brightness index lookup table; adjusting the medical scanning device by using the brightness setting parameter to obtain a second representative brightness value of the stripe pattern; and determining that when the second representative brightness value meets a predetermined brightness range, converting the stripe pattern into a three-dimensional contour of the target object.

[0006] Preferably, it further includes: obtaining the center line of each stripe area of the stripe pattern; taking the center line as a reference, delimiting a stripe range in the stripe area according to a predetermined stripe width; and calculating the pixel gray scale value within the stripe range to obtain the first representative brightness value for filtering out the surrounding noise of the stripe pattern.

[0007] Preferably, the brightness setting rule is to adjust the gain value, exposure time, drive current, start time, end time, and / or duration length of the light-emitting unit of the medical scanning device.

[0008] Preferably, the brightness setting rule is to adjust the gain value, exposure time, sharpness, contrast, start time, end time, and / or duration length of the image receiving unit of the medical scanning device.

[0009] Preferably, it further includes: setting an allowable brightness range; dividing the allowable brightness range into multiple brightness clusters according to a predetermined brightness interval; and using the multiple brightness setting rules and the multiple brightness clusters to set corresponding multiple index values to create the brightness index lookup table.

[0010] Preferably, it further includes: analyzing the difference between the multiple collected brightness values and the predetermined brightness range to determine the index value corresponding to the change trend in the brightness index lookup table.

[0011] Preferably, when it is determined that the second representative brightness value does not conform to the predetermined brightness range, another brightness setting parameter is obtained according to another index value of the second representative brightness value in the brightness index lookup table; the medical scanning device is adjusted using the another brightness setting parameter to obtain a third representative brightness value of the stripe pattern; and according to the judgment result of whether the third representative brightness value conforms to the predetermined brightness range, it is determined whether to use the stripe pattern with the third representative brightness value to convert the three-dimensional contour of the target object, or to obtain other corresponding index values and corresponding brightness setting parameters in the brightness index lookup table according to the third representative brightness value.

[0012] Preferably, the stripe pattern includes a periodically repeated basic stripe sequence, and the basic stripe sequence includes multiple stripe regions with different widths.

[0013] Preferably, based on the central coordinates of each stripe region of the stripe pattern and its corresponding spatial pattern or color, the coding of the stripe region is confirmed, so as to convert the stripe pattern into the three-dimensional contour with the coding.

[0014] The present invention further includes a medical scanning device, comprising: an imaging module; a light emitting unit for projecting detection stripes onto the imaging module to illuminate a target object; an image receiving unit for obtaining a stripe pattern reflected by the target object via the imaging module; and an arithmetic processor electrically connected to the light emitting unit and the image receiving unit. The arithmetic processor adjusts the medical scanning device by using a plurality of brightness setting rules to respectively obtain a plurality of acquisition brightness values of the stripe pattern, generates a brightness index lookup table according to the change trend of the plurality of acquisition brightness values, calculates a first representative brightness value of the stripe pattern after filtering out surrounding noise, obtains a brightness setting parameter according to the index value of the first representative brightness value in the brightness index lookup table, adjusts the medical scanning device by using the brightness setting parameter to obtain a second representative brightness value of the stripe pattern, and when it is determined that the second representative brightness value conforms to a predetermined brightness range, converts the stripe pattern into a three-dimensional contour of the target object.

[0015] Preferably, the detection stripes and the stripe pattern pass through the same imaging combination of the imaging module, or the detection stripes and the stripe pattern respectively pass through a first imaging combination and a second imaging combination that are different from each other in the imaging module.

[0016] Preferably, the arithmetic processor obtains the center line of each stripe region of the stripe pattern, delimits a stripe range in the stripe region according to a predetermined stripe width based on the center line, and calculates the pixel gray scale values within the stripe range to obtain the first representative brightness value for filtering out the surrounding noise of the stripe pattern.

[0017] Preferably, the brightness setting rules are to adjust the gain value, exposure time, drive current, start time, end time, and / or duration length of the light emitting unit.

[0018] Preferably, the brightness setting rules are to adjust the gain value, exposure time, sharpness, contrast, start time, end time, and / or duration length of the image receiving unit.

[0019] Preferably, the arithmetic processor sets an allowable brightness range, divides the allowable brightness range into a plurality of brightness clusters according to a predetermined brightness interval, and uses the plurality of brightness setting rules and the plurality of brightness clusters to set corresponding plurality of index values to create the brightness index lookup table.

[0020] Preferably, the arithmetic processor analyzes the difference between the plurality of acquisition brightness values and the predetermined brightness range to determine the index value corresponding to the change trend in the brightness index lookup table.

[0021] Preferably, the computing processor determines that when the second representative brightness value does not conform to the predetermined brightness range, another brightness setting parameter is obtained according to another index value of the second representative brightness value in the brightness index lookup table, and the medical scanning device is adjusted using the other brightness setting parameter to obtain a third representative brightness value of the stripe pattern. According to the judgment result of whether the third representative brightness value conforms to the predetermined brightness range, it is decided whether to use the stripe pattern with the third representative brightness value to convert the three-dimensional contour of the target object, or to obtain other corresponding index values ​​and corresponding brightness setting parameters in the brightness index lookup table according to the third representative brightness value.

[0022] Preferably, the stripe pattern includes a periodically repeated basic stripe sequence, and the basic stripe sequence includes a plurality of stripe regions with different widths.

[0023] Preferably, the operation processor determines the code of each stripe region of the stripe pattern based on the center coordinates of each stripe region of the stripe pattern and its corresponding spatial pattern or color, so as to convert the stripe pattern into the three-dimensional contour using the code.

[0024] Compared with the prior art, the stripe brightness adjustment method and the medical scanning device provided by the embodiment of the present invention will collect data for the target object in advance to establish a brightness index lookup table, and can directly perform exposure compensation on each test surface of the target object in the subsequent operation, until the representative brightness value of the stripe pattern reflected by the target object after filtering out the surrounding noise meets the predetermined brightness range, and then the stripe pattern is converted into a three-dimensional contour of the target object. The present invention first establishes a brightness index lookup table, and then the brightness index lookup table can be used to quickly adjust the brightness setting parameters of the medical scanning device to obtain clear and correct detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. 4 is a functional block diagram of a medical scanning device according to an embodiment of the present invention.

[0026] Figure 2 FIG. 1 is a schematic diagram of the optical structure of a medical scanning device according to a first embodiment of the present invention.

[0027] Figure 3 FIG. 2 is a schematic diagram of an optical structure of a medical scanning device according to a second embodiment of the present invention.

[0028] Figure 4 FIG. 4 is a flow chart of a stripe brightness adjustment method according to an embodiment of the present invention.

[0029] Figure 5 It is a schematic diagram of the result of collecting brightness values ​​obtained by applying the stripe brightness adjustment method according to an embodiment of the present invention.

[0030] Figure 6Schematic diagram of collecting the change trend of brightness values according to an embodiment of the present invention.

[0031] Figure 7 Schematic diagram of an adjustment strategy designed using the change trend of collected brightness values according to an embodiment of the present invention. Detailed implementation manners

[0032] To further understand the purpose, structure, features, and functions of the present invention, the following is a detailed description in conjunction with embodiments.

[0033] Please refer to Figure 1 , Figure 1 which is a functional block diagram of a medical scanning device 10 according to an embodiment of the present invention. The medical scanning device 10 may include an imaging module 12, a light emitting unit 14, an image receiving unit 16, and an arithmetic processor 18. The light emitting unit 14 projects detection stripes towards the imaging module 12 to irradiate a target object. The image receiving unit 16 can obtain the stripe pattern reflected by the target object via the imaging module 12. The arithmetic processor 18 is electrically connected to the light emitting unit 14 and the image receiving unit 16, and can adjust the control parameters of the light emitting unit 14 and / or the image receiving unit 16, and analyze the stripe pattern to obtain the three-dimensional contour of the target object.

[0034] Please refer to Figure 2 and Figure 3 , Figure 2 which is a schematic optical architecture diagram of a medical scanning device 10A according to a first embodiment of the present invention, Figure 3 and Figure 2 which is a schematic optical architecture diagram of a medical scanning device 10B according to a second embodiment of the present invention. As shown in

[0035] As shown in Figure 3 , the light emitting unit 14 of the medical scanning device 10A uses a projection pattern generator 20 to project detection stripes towards the imaging module 12, and the detection stripes will be projected onto the target object Ot via a reflector 22. The stripe pattern reflected by the target object Ot will be received by the image receiving unit 16 via the reflector 22 and the imaging module 12, and then transmitted to the arithmetic processor 18 for subsequent analysis. Therefore, the detection stripes and the stripe pattern of the medical scanning device 10A pass through the same imaging combination of the imaging module 12.

[0035] As shown in Figure 3 , the light emitting unit 14 of the medical scanning device 10B uses a projection pattern generator 20 to project detection stripes towards a first imaging combination 121 of the imaging module 12, and the detection stripes will be projected onto the target object Ot via a reflector 22. The stripe pattern reflected by the target object Ot will be received by the image receiving unit 16 via the reflector 22 and a second imaging combination 122 of the imaging module 12, and then transmitted to the arithmetic processor 18 for subsequent analysis. According to the above two embodiments, it can be seen that the medical scanning device 10 of the present invention can be applied to various types of optical architectures, not limited to Figure 2 andFigure 3 The illustrated embodiments vary according to design requirements and will not be further described herein.

[0036] Please refer to Figures 1 to 7 , Figure 4 which is a flowchart of the stripe brightness adjustment method according to an embodiment of the present invention, Figure 5 and is a schematic diagram of the result of the acquired brightness value obtained by applying the stripe brightness adjustment method according to an embodiment of the present invention, Figure 6 and is a schematic diagram of the change trend of the acquired brightness value according to an embodiment of the present invention, Figure 7 and is a schematic diagram of the brightness adjustment strategy designed using the change trend of the acquired brightness value according to an embodiment of the present invention. Figure 4 The described stripe brightness adjustment method is applicable to Figures 1 to 3 the medical scanning devices 10, 10A, and 10B shown. In traditional medical scanning devices, when scanning small objects with complex shapes, the stripe pattern is easily affected by the surface color, material refractive index, material transmittance, and material reflectivity of the small object, resulting in a situation where the brightness is too bright or too dark. This further leads to decoding errors and the inability to correctly reconstruct the three-dimensional contour of the small object. The stripe brightness adjustment method of the present invention collects a series of brightness information of the target object Ot to establish a brightness adjustment strategy, which is used to instantaneously adjust the brightness of the detection stripes and the stripe pattern to ensure that the correct three-dimensional contour of the target object Ot can be obtained.

[0037] Regarding the stripe brightness adjustment method, first, step S100 is executed to project the detection stripes onto the target object Ot and obtain the stripe pattern reflected by the target object Ot. Then, step S102 is executed to adjust the light-emitting unit 14 and / or the image receiving unit 16 using a plurality of brightness setting rules to respectively obtain a plurality of acquired brightness values of the stripe pattern. The detection stripes are generated according to the projection pattern generator 20. The detection stripes are deformed by the surface contour of the target object Ot and reflected to obtain the stripe pattern. Generally speaking, the detection stripes and the stripe pattern may include a periodically repeated basic stripe sequence, and the basic stripe sequence will include a plurality of stripe regions with different widths.

[0038] In step S102, the present invention presets thirteen brightness setting rules and uses the gain value and exposure time as the adjustment parameters for each brightness setting rule. It should be noted that the number of brightness setting rules and the parameter types are not limited to the foregoing embodiments. For example, the brightness setting rule can be further designed to adjust the gain value, exposure time, drive current, start time, end time, and / or duration length of the light-emitting unit 14; or to adjust the gain value, exposure time, sharpness, contrast, start time, end time, and / or duration length of the image receiving unit 16, and the changes depend on design requirements.

[0039] As Figure 5As shown, the gain values adopted by the thirteen - pen brightness setting rule range from 0 to 6, and the exposure time ranges from 2056 microseconds (us) to 5141 microseconds (us). The present invention sets 5141 microseconds as the maximum exposure time, and then calculates other exposure times according to different percentages; the actual application is not limited to this. In addition, the numbers N1 - N11 refer to 11 detection positions of the target object Ot; for example, if the target object Ot is a patient's tooth, the numbers N1 - N11 can be the outer surfaces of the patient's incisors, canines, and baby teeth in different orientations, depending on the application field of the medical scanning device 10. Furthermore, the present invention alternatively sets a predetermined brightness range with a gray - scale value between 50 and 75, and Figure 5 marks the acquired brightness values within the predetermined brightness range with a net bottom; the aforementioned predetermined brightness range depends on the design requirements, and the actual application is not limited to this.

[0040] Next, step S104 is executed to generate a brightness index lookup table according to the changing trends of the multiple acquired brightness values. Figure 6 In, the curves C1 - C11 can respectively represent the changing trends of the detection results of each number N1 - N11 of the target object Ot under different brightness setting rules; it can be seen that at different initial brightnesses, the gray - scale values and brightness setting rules of the curves C1 - C11 are generally linearly the same. Figure 7 The brightness adjustment strategy shown can be regarded as the brightness index lookup table of step S104. This brightness adjustment strategy will preset an allowable brightness range, such as an allowable brightness range with a gray - scale value between 23 and 118; and then preset that the target gray - scale value can fall between 58 and 63, or preferably set the gray - scale value 58 as the target gray - scale value, and its change depends on the design requirements.

[0041] In addition, this adjustment strategy will also divide the allowable brightness range into multiple brightness clusters according to a predetermined brightness interval. The predetermined brightness interval can be the value 5, which is used to divide the allowable brightness range with a gray - scale value between 23 and 118 into 21 brightness clusters. The value of the predetermined brightness interval and the number of brightness clusters are not limited to the foregoing embodiments, and may be adjusted according to actual requirements, and other possible changes are not described separately herein. Referring again to Figure 6 the present invention further analyzes the difference between the multiple acquired brightness values (as Figure 5 shown) and the predetermined brightness range (such as the gray - scale value between 50 and 75 mentioned above) to determine the index value corresponding to the changing trend (such as Figure 7 the numerical values 0 - 12), so as to make a brightness index lookup table using the multiple index values corresponding to the brightness setting rules and brightness cluster settings (that is, Figure 7 the brightness adjustment strategy shown).

[0042] After the luminance index lookup table is generated in steps S100 to S104, the output process of the luminance index lookup table is completed. Next, the stripe luminance adjustment method of the present invention can perform the execution process of the luminance index lookup table. First, a detection stripe is projected onto the target object Ot in step S100 to obtain the stripe pattern reflected by the target object Ot, and then step S106 is executed to calculate the first representative luminance value after filtering out the surrounding noise of the stripe pattern. In step S106, the present invention can adopt a masking technique to remove the noise of the stripe pattern, so that the subsequent steps can better utilize the stripe pattern without noise or with low noise to obtain correct information. For example, the present invention first finds the center lines of the stripe regions of the stripe pattern, and demarcates the stripe ranges based on the center lines of the stripe regions according to a predetermined stripe width, and then calculates the pixel gray scale values within the stripe ranges to obtain the first representative luminance value after filtering out the surrounding noise of the stripe pattern. In other words, the masking technique adopted by the present invention removes the noise such as the shadow or light spot at the bright and dark edges of the stripe pattern, so that the calculated first representative luminance value can more accurately represent the luminance information of the stripe pattern. The values of the predetermined stripe width and the stripe range can be adjusted accordingly according to the design requirements.

[0043] Next, steps S108, S110, and S112 are executed to obtain the luminance setting parameters according to the index value in the luminance index lookup table based on the current representative luminance value (i.e., the first representative luminance value), adjust the light emitting unit 14 or the image receiving unit 16 using the luminance setting parameters to obtain the updated representative luminance value of the stripe pattern (i.e., the second representative luminance value), and determine whether the updated representative luminance value meets the predetermined luminance range. Please refer to Figure 5 and Figure 7 , assuming that the first luminance setting parameter with a gain value of 0 and an exposure time of 2056 microseconds in the luminance setting rule is taken as an example. If the obtained first representative luminance value is the gray scale value of 22.25, which falls within the luminance group with a gray scale value less than 23, step S108 can find the corresponding index value 8 from the luminance index lookup table, and then the index value 8 can obtain another luminance setting parameter with a gain value of 2 and an exposure time of 5141 microseconds. Then, step S110 uses the luminance setting parameter with a gain value of 2 and an exposure time of 5141 microseconds to adjust the light emitting unit 14 or the image receiving unit 16. If the second representative luminance value of the stripe pattern obtained is the gray scale value of 45, then step S112 is used to determine whether the second representative luminance value meets the predetermined luminance range with a gray scale value between 50 and 75.

[0044] If the second representative brightness value (e.g., gray scale value 45) does not meet the predetermined brightness range (such as the gray scale value between 50 and 75 as described above), the stripe brightness adjustment method of the present invention will return to steps S108, S110, and S112, obtain another brightness setting parameter according to another index value of the brightness index look-up table for the current representative brightness value (i.e., the second representative brightness value), use the another brightness setting parameter to adjust the light emitting unit 14 or the image receiving unit 16 to obtain an updated representative brightness value (i.e., the third representative brightness value) of the stripe pattern, and determine whether the updated representative brightness value meets the predetermined brightness range. For example: when the second representative brightness value (e.g., gray scale value 45) does not meet the predetermined brightness range, another index value of 11 can be found from the brightness index look-up table, and another brightness setting parameter with a gain value of 5 and an exposure time of 5141 microseconds can be obtained for the another index value of 11. If the light emitting unit 14 or the image receiving unit 16 is adjusted with this brightness setting parameter and the third representative brightness value of the stripe pattern obtained is the gray scale value of 59.32, which falls within the predetermined brightness range, step S114 can be executed to convert the three-dimensional contour of the target object Ot using the stripe pattern with the updated representative brightness value (i.e., the third representative brightness value).

[0045] On the other hand, if the second representative brightness value with a gray scale value of 59.32 is obtained in step S110, and step S112 determines that the second representative brightness value (i.e., the updated representative brightness value) meets the predetermined brightness range, step S114 can be directly executed to convert the three-dimensional contour of the target object Ot using the stripe pattern with the second representative brightness value (i.e., the updated representative brightness value). It should still be mentioned that the stripe brightness adjustment method of the present invention mainly confirms the coding of the stripe regions based on the central coordinates of the respective stripe regions of the stripe pattern and their corresponding spatial patterns (i.e., the spatial coordinates corresponding to the pixel coordinates where the center of each stripe is located) or colors, and thus converts the three-dimensional contour using this coding for the stripe pattern; the manner of converting the three-dimensional contour from the stripe pattern is not limited to the foregoing content and can be obtained using existing technologies or their improvements, so it will not be described separately herein.

[0046] The stripe brightness adjustment method and medical scanning device of the present invention will pre-collect data for a target object to establish a brightness index lookup table, that is, steps S100, S102, and S104; after the output process of the brightness index lookup table is completed, exposure compensation can be directly performed on each surface to be measured of the target object during subsequent operations, that is, after executing step S100, steps S102 and S104 will not be passed through, but steps S106 to S114 will be executed until the representative brightness value of the stripe pattern reflected by the target object after filtering out the surrounding noise conforms to a predetermined brightness range, and then the stripe pattern will be converted into a three-dimensional contour of the target object. In other words, the present invention first establishes a brightness index lookup table, and then the brightness setting parameters of the medical scanning device can be quickly adjusted using the brightness index lookup table to obtain clear and correct detection results.

[0047] In summary, the embodiments of the present invention provide a stripe brightness adjustment method and a medical scanning device thereof. The stripe brightness adjustment method is applied to a medical scanning device that projects detection stripes onto a target object. The stripe brightness adjustment method includes obtaining the stripe pattern reflected by the target object, adjusting the medical scanning device using a plurality of brightness setting rules to respectively obtain a plurality of acquisition brightness values of the stripe pattern, generating a brightness index lookup table according to the change trend of the plurality of acquisition brightness values, obtaining a brightness setting parameter in the brightness index lookup table according to the first representative brightness value of the stripe pattern, adjusting the medical scanning device using the brightness setting parameter to obtain the second representative brightness value of the stripe pattern, and determining that when the second representative brightness value conforms to a predetermined brightness range, converting the stripe pattern into a three-dimensional contour of the target object. In this way, by first establishing a brightness index lookup table, the brightness setting parameters of the medical scanning device can be quickly adjusted using the brightness index lookup table to obtain clear and correct detection results.

[0048] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate the preferred embodiments of the present invention and should not be construed as a limitation of the present invention. For the sake of clearly describing the components required, the proportions in the schematic drawings do not represent the proportional relationships of the actual components.

[0049] The present invention has been described by the above related embodiments. However, the above embodiments are only examples of implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and refinements made without departing from the spirit and scope of the present invention fall within the scope of patent protection of the present invention.

Claims

1. A stripe brightness adjustment method, applied to a medical scanning device, which projects detection stripes onto a target object. It is characterized in that The stripe brightness adjustment method includes: Obtaining the stripe pattern reflected by the target object; Adjusting the medical scanning device by using a plurality of brightness setting rules to respectively obtain a plurality of acquisition brightness values of the stripe pattern; Generating a brightness index lookup table according to the changing trend of the plurality of acquisition brightness values; Calculating a first representative brightness value of the stripe pattern after filtering out surrounding noise; Obtaining a brightness setting parameter according to the index value of the brightness index lookup table corresponding to the first representative brightness value; Adjusting the medical scanning device by using the brightness setting parameter to obtain a second representative brightness value of the stripe pattern; and Judging that when the second representative brightness value meets a predetermined brightness range, converting the stripe pattern into a three-dimensional contour of the target object.

2. The stripe brightness adjustment method according to claim 1, wherein It further includes: Obtaining the center line of each stripe area of the stripe pattern; Taking the center line as a reference and delimiting a stripe range in the stripe area according to a predetermined stripe width; And Calculating the pixel gray scale values within the stripe range to obtain the first representative brightness value for filtering out the surrounding noise of the stripe pattern.

3. The stripe brightness adjustment method according to claim 1, wherein The brightness setting rule is to adjust the gain value, exposure time, drive current, start time, end time, and / or duration length of the light emitting unit of the medical scanning device.

4. The stripe brightness adjustment method according to claim 1, wherein The brightness setting rule is to adjust the gain value, exposure time, sharpness, contrast, start time, end time, and / or duration length of the image receiving unit of the medical scanning device.

5. The stripe brightness adjustment method according to claim 1, wherein It further includes: Setting an allowable brightness range; Dividing the allowable brightness range into a plurality of brightness clusters according to a predetermined brightness interval; And Using the plurality of brightness setting rules and the plurality of brightness clusters to set corresponding plurality of index values to make the brightness index lookup table.

6. The stripe brightness adjustment method according to claim 1, wherein It further includes: Analyzing the difference between the plurality of acquisition brightness values and the predetermined brightness range to determine the index value corresponding to the changing trend in the brightness index lookup table.

7. The stripe brightness adjustment method according to claim 1, characterized in that It further includes: When judging that the second representative brightness value does not meet the predetermined brightness range, obtaining another brightness setting parameter according to another index value of the second representative brightness value in the brightness index lookup table; Adjusting the medical scanning device by using the another brightness setting parameter to obtain a third representative brightness value of the stripe pattern; And According to the judgment result of whether the third representative brightness value meets the predetermined brightness range, deciding to convert the three-dimensional contour of the target object by using the stripe pattern with the third representative brightness value, or to obtain other corresponding index values and corresponding brightness setting parameters in the brightness index lookup table according to the third representative brightness value.

8. The stripe brightness adjustment method according to claim 1, wherein The stripe pattern includes a periodically repeated basic stripe sequence, and the basic stripe sequence includes a plurality of stripe areas with different widths.

9. The stripe brightness adjustment method according to claim 8, wherein Based on the central coordinates of each stripe area of the stripe pattern and its corresponding spatial pattern or color, confirming the coding of the stripe area, so as to convert the stripe pattern into the three-dimensional contour with the coding.

10. A medical scanning device, characterized in that, It includes: An imaging module; A light emitting unit for projecting a detection stripe to the imaging module to illuminate a target object; An image receiving unit for obtaining the stripe pattern reflected by the target object via the imaging module; And An operation processor is electrically connected to the light-emitting unit and the image receiving unit. The operation processor adjusts the medical scanning device by using a plurality of brightness setting rules to respectively obtain a plurality of acquisition brightness values of the stripe pattern, generates a brightness index lookup table according to the change trend of the plurality of acquisition brightness values, calculates a first representative brightness value of the stripe pattern after filtering out surrounding noise thereof, obtains a brightness setting parameter according to the index value of the first representative brightness value in the brightness index lookup table, adjusts the medical scanning device by using the brightness setting parameter to obtain a second representative brightness value of the stripe pattern, and when it is determined that the second representative brightness value conforms to a predetermined brightness range, converts the stripe pattern into a three-dimensional contour of the target object.

11. The medical scanning device according to claim 10, characterized in that, The detection stripe and the stripe pattern pass through the same imaging combination of the imaging module, or the detection stripe and the stripe pattern respectively pass through a first imaging combination and a second imaging combination with differences in the imaging module.

12. The medical scanning device according to claim 10, characterized in that, The operation processor obtains the center line of each stripe area of the stripe pattern, delimits a stripe range in the stripe area according to a predetermined stripe width based on the center line, and calculates the pixel gray scale values within the stripe range to obtain the first representative brightness value for filtering out the surrounding noise of the stripe pattern.

13. The medical scanning device according to claim 10, wherein The brightness setting rule is to adjust the gain value, exposure time, drive current, start time, end time, and / or duration length of the light-emitting unit.

14. The medical scanning device according to claim 10, characterized in that, The brightness setting rule is to adjust the gain value, exposure time, sharpness, contrast, start time, end time, and / or duration length of the image receiving unit.

15. The medical scanning device according to claim 10, characterized in that, The operation processor sets an allowable brightness range, divides the allowable brightness range into a plurality of brightness groups according to a predetermined brightness interval, and uses the plurality of brightness setting rules and the plurality of brightness groups to set corresponding index values to create the brightness index lookup table.

16. The medical scanning device according to claim 10, wherein, The operation processor analyzes the difference between the plurality of acquisition brightness values and the predetermined brightness range to determine the index value corresponding to the change trend in the brightness index lookup table.

17. The medical scanning device according to claim 10, characterized in that, When the operation processor determines that the second representative brightness value does not conform to the predetermined brightness range, it obtains another brightness setting parameter according to another index value of the second representative brightness value in the brightness index lookup table, adjusts the medical scanning device by using the another brightness setting parameter to obtain a third representative brightness value of the stripe pattern, and according to the judgment result of whether the third representative brightness value conforms to the predetermined brightness range, decides to convert the three-dimensional contour of the target object by using the stripe pattern with the third representative brightness value, or to obtain other corresponding index values and corresponding brightness setting parameters in the brightness index lookup table according to the third representative brightness value.

18. The medical scanning device according to claim 10, characterized in that, The stripe pattern includes a periodically repeated basic stripe sequence, and the basic stripe sequence includes a plurality of stripe areas with different widths.

19. The medical scanning device according to claim 18, wherein, The operation processor confirms the encoding of each stripe area of the stripe pattern based on the center coordinates of the stripe area and its corresponding spatial pattern or color, so as to convert the stripe pattern into the three-dimensional contour with the encoding.

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