CN104856681A - Internal and external heel turning detecting method for foot type of human body - Google Patents
Internal and external heel turning detecting method for foot type of human body Download PDFInfo
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- CN104856681A CN104856681A CN201510174394.7A CN201510174394A CN104856681A CN 104856681 A CN104856681 A CN 104856681A CN 201510174394 A CN201510174394 A CN 201510174394A CN 104856681 A CN104856681 A CN 104856681A
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Abstract
The invention relates to the technical field of human body foot type detection, and provides an internal and external heel turning detecting method for the foot type of a human body. The detection method comprises the following steps: using a real object digitzing device to obtain discrete point cloud data of feet to be detected; performing triangularization on the discrete point cloud data of feet to be detected to generate a grid curved surface; performing hole repairing on the grid curved surface to generate a closed curved surface; establishing a local coordinate system to enable the global coordinate system to coincide with the local coordinate system; performing line cutting on the closed curved surface, and recording the maximal and minimal intercepting points in a y-axis coordinate in all layers of cut lines; finding out internal and external ankle points of the feet; taking the plane as an intercepting plane, wherein the internal and external ankle points are in the plane and the plane has a normal vector perpendicular to the z axis, and obtaining the intersection between the intercepting plane and the grid curved surface; calculating the turning angle; comparing the obtained turning angle value with the internal and external turning judgment standard of the feet, and judging the internal and external turning type of the heel. The detection reliability of the human body foot type is improved, the accuracy is high, and the zero misdiagnosis rate is achieved, and the efficiency is high.
Description
Technical field
The present invention relates to human body foot type detection technique field, particularly outward turning detection method in human body foot type heel.
Background technology
The healthy and strong obvious feature of foot is that toe unfolds not extruding, flexible and strong, and sole front portion is muscular, and arch of foot is fully formed, flexible, strong sense.This foot type earth-grasping force is strong, and stability of equilibrium is fine, is not easy to fall down.And the foot of modern many urban children is elongated, sole muscle weakness is unable, foot inward turning or outward turning serious, cause walking unstable, stability of equilibrium and shock resistance are all very poor, are easy to fall injured, even injure other positions of health, so outward turning in foot can be detected accurately, and then have the strong foot of a pair of by correcting, very meaningful to the quality of life and body development health improving child.
At present, any testing agency carries out observation by artificial naked eyes to foot to determine foot type, and there is error large, spended time is long, and efficiency is low, the problem that misdiagnosis rate is high.
Therefore, human body foot type detection technique field is badly in need of one and is automatically judged foot type by 3-D scanning, and efficiency is high, and precision is high, outward turning detection method in the human body foot type heel of 0 misdiagnosis rate.
Summary of the invention
The invention provides outward turning detection method in human body foot type heel, technical scheme is as follows:
Outward turning detection method in human body foot type heel, comprises the steps:
Step one, utilizes digitalizer in kind to obtain the discrete point cloud data of foot to be detected;
Step 2, adopts marching cube Marching Cub method to carry out trigonometric ratio, generating mesh curved surface to the foot discrete point cloud data obtained;
Step 3, carries out hole repair to gained grid surface, makes the grid surface generated by trigonometric ratio be an occluding surface;
Step 4, sets up local coordinate system, is three-dimensional system of coordinate, and global coordinate system is overlapped with local coordinate system;
Step 5, carries out transversal to termination plane to the occluding surface of step 3 gained from initial planar, and records the minimum and maximum transversal point of y-axis coordinate in each layer transversal;
Step 6, suppose that the point set that step 5 gained each transversal y coordinate smallest point is formed is PA, the point set that each transversal y coordinate maximum point is formed is PB, then y coordinate reckling in PA is identified as external malleolus point, y-axis the maximum in PB is identified as internal malleolus point, and then finds ankle point inside and outside foot;
Step 7, to cross medial and lateral malleolus point and the normal vector plane perpendicular to z-axis for cutting plane, asks the intersection of cutting plane and grid surface;
Step 8, finds some A, the B at the minimum and maximum value place of z coordinate in intersection, and finds the flex point C, the D that are positioned at the minimum and maximum value of y coordinate near the minimum and maximum value of z coordinate;
Step 9, the mid point of note A, B point is M
1, the mid point of medial and lateral malleolus point is M
2, the mid point of C, D point is M
3, carry out calculating swing angle, concrete formula is as follows:
Preferably, in above-mentioned human body foot type heel in outward turning detection method, the digitalizer in kind in step one is white light scanning instrument or laser scanner.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, when step one adopts digitalizer in kind to carry out data acquisition, data acquisition highly exceedes the 20-100mm of the higher person in anklebone inside and outside human foot to be detected.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, when step one adopts digitalizer in kind to carry out data acquisition, data acquisition highly exceedes the 50mm of the higher person in anklebone inside and outside human foot to be detected.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, in step 4, the concrete steps of local coordinate system method for building up are: taking fully baseplane is XOY plane, the XOY plane normal vector being pointed to the side of shank by vola is local coordinate system z-axis positive direction, being positioned at XOY plane and pointing to the unit vector in tiptoe direction by vola is x-axis positive direction, y-axis is perpendicular to X-axis, and y-axis positive direction is determined according to right-handed coordinate system rule.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, in step 5, initial planar is z=10-60mm, and termination plane is z=80-200mm, and is that interval height carries out transversal to termination plane to the occluding surface of step 3 gained from initial planar with 0.5-3mm.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, in step 5, initial planar is z=50mm, and termination plane is z=100mm, and is that interval height carries out transversal to termination plane to the occluding surface of step 3 gained from initial planar with 1mm.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, the concrete method for solving carrying out transversal operation for occluding surface in step 5 is:
First, leg-of-mutton for each in grid surface three summits are brought into SECTION EQUATION and the sign of result of determination;
Further, if three summit jack per lines, then prove current triangle and plane non-intersect, exit flow process; If contrary sign, then calculate the intersection point of Atria bar limit and plane respectively, two intersection points must be had to drop on triangle;
Further, the intersection point of gained is carried out first place and be connected, generate closed curve.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, in step 10, the type of heel is divided into normal inward turning, slight inward turning, moderate inward turning, serious inward turning, normal outward turning, slight outward turning, moderate outward turning, serious outward turning eight type.
Preferably, in above-mentioned human body foot type heel in outward turning detection method, in step 10, the criterion of heel is:
for normal inward turning,
for slight inward turning,
for moderate inward turning,
for serious inward turning;
for normal outward turning,
for slight outward turning,
for moderate outward turning,
for serious outward turning.
The invention has the beneficial effects as follows:
The present invention carries out data acquisition by digitalizer in kind to foot, marching cube Marching Cub method is adopted to judge foot type again, realize the object of automatic decision foot type, judge for foot type relative to prior art by naked eyes, overcome the complicated operation of naked eyes diagnosis, the shortcoming of complex steps.The invention belongs to technical grade precision, coordinate data is more accurately dense, and improve the reliability of human body foot type diagnosis, degree of accuracy is high, and 0 misdiagnosis rate, efficiency is high.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structural representation of cutting plane of the present invention and grid surface intersection.
Detailed description of the invention
Core of the present invention, for providing outward turning detection method in a kind of human body foot type heel, solves and cannot measure human figure, curvilinear characteristic, and measuring speed is slow, and workload is large, the problem that error is large.
The measure realized to make the technology of the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
Fig. 1 is the structural representation of cutting plane of the present invention and grid surface intersection, and as shown in Figure 1, outward turning detection method in human body foot type heel, comprises the steps:
Step one, utilizes digitalizer in kind to obtain the discrete point cloud data of foot to be detected;
Step 2, adopts marching cube Marching Cub method to carry out trigonometric ratio, generating mesh curved surface to the foot discrete point cloud data obtained;
Step 3, carries out hole repair to gained grid surface, makes the grid surface generated by trigonometric ratio be an occluding surface;
Step 4, sets up local coordinate system, is three-dimensional system of coordinate, and global coordinate system is overlapped with local coordinate system;
Step 5, carries out transversal to termination plane to the occluding surface of step 3 gained from initial planar, and records the minimum and maximum transversal point of y-axis coordinate in each layer transversal;
Step 6, suppose that the point set that step 5 gained each transversal y coordinate smallest point is formed is PA, the point set that each transversal y coordinate maximum point is formed is PB, then y coordinate reckling in PA is identified as external malleolus point, y-axis the maximum in PB is identified as internal malleolus point, and then finds ankle point inside and outside foot;
Step 7, to cross medial and lateral malleolus point and the normal vector plane perpendicular to z-axis for cutting plane, asks the intersection of cutting plane and grid surface;
Step 8, finds some A, the B at the minimum and maximum value place of z coordinate in intersection, and finds the flex point C, the D that are positioned at the minimum and maximum value of y coordinate near the minimum and maximum value of z coordinate;
Step 9, the mid point of note A, B point is M
1, the mid point of medial and lateral malleolus point is M
2, the mid point of C, D point is M
3, carry out calculating swing angle, concrete formula is as follows:
Wherein, Ang represents swing angle, M
3y () represents M
3the y value of point, M
2y () represents M
2the y value of point;
Step 10, in the swing angle value of step 9 being tried to achieve and foot, outward turning criterion compares, and then judges outward turning type in heel.
Digitalizer in kind in the present embodiment step one is white light scanning instrument or laser scanner.
When the present embodiment step one adopts digitalizer in kind to carry out data acquisition, data acquisition highly exceedes the 20-100mm of the higher person in anklebone inside and outside human foot to be detected, is preferably 50mm.
In the present embodiment step 4, the concrete steps of local coordinate system method for building up are: taking fully baseplane is XOY plane, the XOY plane normal vector being pointed to the side of shank by vola is local coordinate system z-axis positive direction, being positioned at XOY plane and pointing to the unit vector in tiptoe direction by vola is x-axis positive direction, y-axis is perpendicular to X-axis, and y-axis positive direction is determined according to right-handed coordinate system rule.
In the present embodiment step 5, initial planar is z=10-60mm, and termination plane is z=80-200mm, and is for interval height carries out transversal to termination plane to the occluding surface of step 3 gained from initial planar with 0.5-3mm; Preferably, choose initial planar z=50mm, stop plane z=100mm, and be interval height with 1mm.
The concrete method for solving carrying out transversal operation for occluding surface in the present embodiment step 5 is:
First, leg-of-mutton for each in grid surface three summits are brought into SECTION EQUATION and the sign of result of determination;
Further, if three summit jack per lines, then prove current triangle and plane non-intersect, exit flow process; If contrary sign, then calculate the intersection point of Atria bar limit and plane respectively, two intersection points must be had to drop on triangle;
Further, the intersection point of gained is carried out first place and be connected, generate closed curve.
In the present embodiment step 10, the type of heel is divided into normal inward turning, slight inward turning, moderate inward turning, serious inward turning, normal outward turning, slight outward turning, moderate outward turning, serious outward turning eight type.
In the present embodiment step 10, the criterion of heel is:
for normal inward turning,
for slight inward turning,
for moderate inward turning,
for serious inward turning;
for normal outward turning,
for slight outward turning,
for moderate outward turning,
for serious outward turning.
The present invention carries out data acquisition by digitalizer in kind to foot, marching cube Marching Cub method is adopted to judge foot type again, realize the object of automatic decision foot type, judge for foot type relative to prior art by naked eyes, overcome the complicated operation of naked eyes diagnosis, the shortcoming of complex steps.The invention belongs to technical grade precision, coordinate data is more accurately dense, and improve the reliability of human body foot type diagnosis, degree of accuracy is high, and 0 misdiagnosis rate, efficiency is high.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. outward turning detection method in human body foot type heel, is characterized in that, comprise the steps:
Step one, utilizes digitalizer in kind to obtain the discrete point cloud data of foot to be detected;
Step 2, adopts marching cube Marching Cub method to carry out trigonometric ratio, generating mesh curved surface to the foot discrete point cloud data obtained;
Step 3, carries out hole repair to gained grid surface, makes the grid surface generated by trigonometric ratio be an occluding surface;
Step 4, sets up local coordinate system, is three-dimensional system of coordinate, and global coordinate system is overlapped with local coordinate system;
Step 5, carries out transversal from initial planar to the occluding surface of termination plane to described step 3 gained, and records the minimum and maximum transversal point of y-axis coordinate in each layer transversal;
Step 6, suppose that the point set that described step 5 gained each transversal y coordinate smallest point is formed is PA, the point set that each transversal y coordinate maximum point is formed is PB, then y coordinate reckling in PA is identified as external malleolus point, y-axis the maximum in PB is identified as internal malleolus point, and then finds ankle point inside and outside foot;
Step 7, to cross medial and lateral malleolus point and the normal vector plane perpendicular to z-axis for cutting plane, asks the intersection of cutting plane and grid surface;
Step 8, finds some A, the B at the minimum and maximum value place of z coordinate in intersection, and finds the flex point C, the D that are positioned at the minimum and maximum value of y coordinate near the minimum and maximum value of z coordinate;
Step 9, the mid point of note A, B point is M
1, the mid point of medial and lateral malleolus point is M
2, the mid point of C, D point is M
3, carry out calculating swing angle, concrete formula is as follows:
Wherein, Ang represents swing angle, M
3y () represents M
3the y value of point, M
2y () represents M
2the y value of point;
Step 10, in the swing angle value of described step 9 being tried to achieve and foot, outward turning criterion compares, and then judges outward turning type in heel.
2. outward turning detection method in human body foot type heel according to claim 1, it is characterized in that, the digitalizer in kind in described step one is white light scanning instrument or laser scanner.
3. outward turning detection method in human body foot type heel according to claim 1, it is characterized in that, when described step one adopts digitalizer in kind to carry out data acquisition, data acquisition highly exceedes the 20-100mm of the higher person in anklebone inside and outside human foot to be detected.
4. outward turning detection method in human body foot type heel according to claim 3, is characterized in that, when described step one adopts digitalizer in kind to carry out data acquisition, data acquisition highly exceedes the 50mm of the higher person in anklebone inside and outside human foot to be detected.
5. outward turning detection method in human body foot type heel according to claim 1, it is characterized in that, in described step 4, the concrete steps of local coordinate system method for building up are: taking fully baseplane is XOY plane, the XOY plane normal vector being pointed to the side of shank by vola is local coordinate system z-axis positive direction, being positioned at XOY plane and pointing to the unit vector in tiptoe direction by vola is x-axis positive direction, y-axis is perpendicular to X-axis, and y-axis positive direction is determined according to right-handed coordinate system rule.
6. outward turning detection method in human body foot type heel according to claim 1, it is characterized in that, in described step 5, initial planar is z=10-60mm, termination plane is z=80-200mm, and is that interval height carries out transversal from initial planar to the occluding surface of termination plane to described step 3 gained with 0.5-3mm.
7. outward turning detection method in human body foot type heel according to claim 6, it is characterized in that, in described step 5, initial planar is z=50mm, termination plane is z=100mm, and is that interval height carries out transversal from initial planar to the occluding surface of termination plane to described step 3 gained with 1mm.
8. outward turning detection method in human body foot type heel according to claim 1, is characterized in that, the concrete method for solving carrying out transversal operation for occluding surface in described step 5 is:
First, leg-of-mutton for each in grid surface three summits are brought into SECTION EQUATION and the sign of result of determination;
Further, if three summit jack per lines, then prove current triangle and plane non-intersect, exit flow process; If contrary sign, then calculate the intersection point of Atria bar limit and plane respectively, two intersection points must be had to drop on triangle;
Further, the intersection point of gained is carried out first place and be connected, generate closed curve.
9. outward turning detection method in human body foot type heel according to claim 1, it is characterized in that, in described step 10, the type of heel is divided into normal inward turning, slight inward turning, moderate inward turning, serious inward turning, normal outward turning, slight outward turning, moderate outward turning, serious outward turning eight type.
10. outward turning detection method in human body foot type heel according to claim 9, it is characterized in that, in described step 10, the criterion of heel is:
for normal inward turning,
for slight inward turning,
for moderate inward turning,
for serious inward turning;
for normal outward turning,
for slight outward turning,
for moderate outward turning,
for serious outward turning.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105976406A (en) * | 2016-04-26 | 2016-09-28 | 上海时元互联网科技有限公司 | Measurement system, measurement device, foot type measurement method, and foot type measurement system |
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| CN101166463A (en) * | 2005-03-11 | 2008-04-23 | Rs扫描国际公司 | Method and appartus for displaying 3D images of a part of the skeleton |
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| CN104856681B (en) | 2017-07-21 |
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Effective date of registration: 20151023 Address after: 200127 Shanghai Pudong New Area City 111 Eshan road block A No. 5 Applicant after: SHANGHAI SINAINA CHILDREN LIFESTYLE CO., LTD. Address before: 201127 Shanghai Pudong New Area City 111 Eshan road block A No. 5 Applicant before: This Nai Na Children Supplies Co., Ltd of Shanghai |
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Effective date of registration: 20190515 Address after: Room 199, Building 131 and 175 Kaiqing Road, Pudong New Area, Shanghai, 201201 Patentee after: Shanghai Yungong Technology Co., Ltd. Address before: 5th Floor, Block A, 111 Eshan Road, Pudong New District, Shanghai, 2012 Patentee before: SHANGHAI SINAINA CHILDREN LIFESTYLE CO., LTD. |
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