CN104856681B - Outward turning detection method in human body foot type heel - Google Patents
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Abstract
The present invention relates to human body foot type detection technique field there is provided outward turning detection method in human body foot type heel, including：The discrete point cloud data of foot to be detected is obtained using digitalizer in kind；Trigonometric ratio is carried out to the foot discrete point cloud data of acquisition, grid surface is generated；Hole repair is carried out to grid surface, an occluding surface is generated；Local coordinate system is set up, global coordinate system is overlapped with local coordinate system；Transversal is carried out to occluding surface, and records the minimum and maximum transversal point of y-axis coordinate in each layer transversal；Find ankle point inside and outside foot；To cross the plane of medial and lateral malleolus point and normal vector perpendicular to z-axis as cutting plane, the intersection of cutting plane and grid surface is sought；Calculate swing angle；The swing angle value tried to achieve is compared with outward turning criterion in foot, and then judges outward turning type in heel.The present invention improves the reliability of human body foot type detection, and accuracy is high, 0 misdiagnosis rate, efficiency high.
Description
Technical field
The present invention relates to human body foot type detection technique field, more particularly to outward turning detection method in human body foot type heel.
Background technology
The characteristics of healthy and strong pin is obvious be toe unfold do not extrude, it is flexible and strong, sole front portion is muscular, foot
Bow is formed completely, flexible, strong sense.This foot type earth-grasping force is strong, and stability of equilibrium is fine, it is not easy to fall down.And it is modern
The pin of many urban children is elongated, and sole muscle weakness is powerless, and foot inward turning or outward turning are serious, causes shakiness on foot, and balance is steady
Qualitative and shock resistance is all very poor, it is easy to falls injured, or even injures other positions of body, so can accurately detect
Outward turning in foot, and then the strong pin of a pair of is possessed by correction, it is non-to the quality of life and body development health of raising child
It is often meaningful.
At present, any testing agency is all to carry out observation to foot by manually naked eyes to determine foot type, there is error greatly, flower
Time-consuming length, efficiency is low, the problem of misdiagnosis rate is high.
Therefore, human body foot type detection technique field be badly in need of it is a kind of foot type is judged by 3-D scanning automatically, efficiency high, precisely
Degree is high, outward turning detection method in the human body foot type heel of 0 misdiagnosis rate.
The content 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 following steps：
Step one, the discrete point cloud data of foot to be detected is obtained using digitalizer in kind；
Step 2, triangle is carried out using marching cube Marching Cub methods to the foot discrete point cloud data of acquisition
Change, generate grid surface；
Step 3, hole repair is carried out to gained grid surface, and it is an envelope to make the grid surface generated by trigonometric ratio
Closed 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, and record each layer from initial planar to termination plane to the occluding surface obtained by step 3
The minimum and maximum transversal point of y-axis coordinate in transversal；
Step 6, it is assumed that the point set that each transversal y-coordinate smallest point obtained by step 5 is constituted is PA, each transversal y-coordinate is maximum
The point set that point is constituted is PB, then y-coordinate reckling in PA is identified as into external malleolus point, y-axis the maximum in PB is identified as into internal malleolus point,
And then find ankle point inside and outside foot；
Step 7, to cross the plane of medial and lateral malleolus point and normal vector perpendicular to z-axis as cutting plane, asks cutting plane and grid surface
Intersection；
Step 8, finds point A, B where the maximum and minimum value of z coordinate in intersection, and find positioned at z coordinate it is maximum and
Flex point C, D of y-coordinate maximum and minimum value near minimum value；
Step 9, the midpoint of note A, B point is M1, the midpoint of medial and lateral malleolus point is M2, the midpoint of C, D point is M3, carry out calculating rotation
Angle, specific formula is as follows：
Wherein, Ang represents swing angle, M3(y) M is represented3The y values of point, M2(y) M is represented2The y values of point；
Step 10, the swing angle value that step 9 is tried to achieve is compared with outward turning criterion in foot, and then judges heel
Interior outward turning type.
It is preferred that, 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.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, step one is entered using digitalizer in kind
During row data acquisition, data acquisition highly exceedes the 20-100mm of the higher person in anklebone inside and outside human foot to be detected.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, step one is entered using digitalizer in kind
During row data acquisition, data acquisition highly exceedes the 50mm of the higher person in anklebone inside and outside human foot to be detected.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, local coordinate system method for building up in step 4
Concretely comprise the following steps：Baseplane is taken fully for XOY plane, the XOY plane normal vector that the side of shank is pointed to by vola is sat to be local
Mark system z-axis positive direction, points to the unit vector in tiptoe direction for x-axis positive direction, y-axis is vertical in XOY plane and by vola
In X-axis, y-axis positive direction is determined according to right-handed coordinate system rule.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, initial planar is z=10- in step 5
60mm, termination plane is z=80-200mm, and by interval height of 0.5-3mm from initial planar to termination plane to step
The occluding surface of three gained carries out transversal.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, initial planar is z=50mm in step 5,
Termination plane is z=100mm, and by interval height of 1mm from initial planar to termination plane to the closing obtained by step 3
Curved surface carries out transversal.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, cut in step 5 for occluding surface
Line operation specific method for solving be：
First, three summits of each triangle in grid surface are brought into SECTION EQUATION and result of determination positive and negative
Number；
Further, if three summit jack per lines, prove that current triangle is non-intersect with plane, exit flow；If
Contrary sign, then calculate the intersection point of Atria bar side and plane, must have two intersection points to fall on triangle respectively；
Further, the intersection point of gained is joined end to end, generates closed curve.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, the type of heel is divided into normally in step 10
Inward turning, slight inward turning, moderate inward turning, serious inward turning, normal outward turning, slight outward turning, moderate outward turning, the serious type of outward turning eight.
It is preferred that, in above-mentioned human body foot type heel in outward turning detection method, the criterion of heel is in step 10：
- 9 °≤Ang≤0 ° is normal inward turning, and -15 °≤Ang≤- 10 ° are slight inward turning, during -20 °≤Ang≤- 16 ° are
Inward turning is spent, ＜ -20 ° of Ang is serious inward turning；0 ° of ＜ Ang≤9 ° is normal outward turning, and 10 °≤Ang≤15 ° are slight outward turning,
16 °≤Ang≤20 ° are moderate outward turning, and 20 ° of Ang ＞ are serious outward turning.
The beneficial effects of the invention are as follows：
The present invention carries out data acquisition by digitalizer in kind to foot, then using marching cube Marching
Cub methods are judged foot type, realize the purpose of automatic decision foot type, judge foot type by naked eyes relative to prior art and
Speech, overcomes complex operation, the shortcoming of complex steps of naked eyes diagnosis.The invention belongs to industrial class precision, coordinate data is more
It is dense accurate, the reliability of human body foot type diagnosis is improved, accuracy is high, 0 misdiagnosis rate, efficiency high.
Brief description of the drawings
Describe the present invention in detail with reference to the accompanying drawings and detailed description：
Fig. 1 is the structural representation of cutting plane of the present invention and grid surface intersection.
Embodiment
The core of the present invention is provides outward turning detection method in a kind of human body foot type heel, and people's bodily form can not be measured by solving
State, curvilinear characteristic, measuring speed are slow, and workload is big, the problem of error is big.
In order that measure, creation characteristic, reached purpose and effect that the technology of the present invention is realized are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further.
Fig. 1 is the structural representation of cutting plane of the present invention and grid surface intersection, as shown in figure 1, in human body foot type heel
Outward turning detection method, comprises the following steps：
Step one, the discrete point cloud data of foot to be detected is obtained using digitalizer in kind；
Step 2, triangle is carried out using marching cube Marching Cub methods to the foot discrete point cloud data of acquisition
Change, generate grid surface；
Step 3, hole repair is carried out to gained grid surface, and it is an envelope to make the grid surface generated by trigonometric ratio
Closed 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, and record each layer from initial planar to termination plane to the occluding surface obtained by step 3
The minimum and maximum transversal point of y-axis coordinate in transversal；
Step 6, it is assumed that the point set that each transversal y-coordinate smallest point obtained by step 5 is constituted is PA, each transversal y-coordinate is maximum
The point set that point is constituted is PB, then y-coordinate reckling in PA is identified as into external malleolus point, y-axis the maximum in PB is identified as into internal malleolus point,
And then find ankle point inside and outside foot；
Step 7, to cross the plane of medial and lateral malleolus point and normal vector perpendicular to z-axis as cutting plane, asks cutting plane and grid surface
Intersection；
Step 8, finds point A, B where the maximum and minimum value of z coordinate in intersection, and find positioned at z coordinate it is maximum and
Flex point C, D of y-coordinate maximum and minimum value near minimum value；
Step 9, the midpoint of note A, B point is M1, the midpoint of medial and lateral malleolus point is M2, the midpoint of C, D point is M3, carry out calculating rotation
Angle, specific formula is as follows：
Wherein, Ang represents swing angle, M3(y) M is represented3The y values of point, M2(y) M is represented2The y values of point；
Step 10, the swing angle value that step 9 is tried to achieve is compared with outward turning criterion in foot, and then judges heel
Interior outward turning type.
Digitalizer in kind in the present embodiment step one is white light scanning instrument or laser scanner.
When the present embodiment step one carries out data acquisition using digitalizer in kind, data acquisition highly exceedes to be detected
Inside and outside human foot in anklebone the higher person 20-100mm, preferably 50mm.
Local coordinate system method for building up concretely comprises the following steps in the present embodiment step 4：Baseplane is taken fully for XOY plane, by
The XOY plane normal vector that the side of shank is pointed in vola is local coordinate system z-axis positive direction, in XOY plane and by vola
The unit vector for pointing to tiptoe direction is x-axis positive direction, and y-axis is perpendicular to X-axis, and y-axis positive direction is true according to right-handed coordinate system rule
It is fixed.
Initial planar is z=10-60mm in the present embodiment step 5, and termination plane is z=80-200mm, and with 0.5-
3mm is that interval height carries out transversal from initial planar to termination plane to the occluding surface obtained by step 3；It is preferred that, choose
Beginning plane z=50mm, terminates plane z=100mm, and using 1mm as interval height.
It is for the specific method for solving that occluding surface carries out transversal operation in the present embodiment step 5：
First, three summits of each triangle in grid surface are brought into SECTION EQUATION and result of determination positive and negative
Number；
Further, if three summit jack per lines, prove that current triangle is non-intersect with plane, exit flow；If
Contrary sign, then calculate the intersection point of Atria bar side and plane, must have two intersection points to fall on triangle respectively；
Further, the intersection point of gained is joined end to end, generates closed curve.
The type of heel is divided into normal inward turning in the present embodiment step 10, slight inward turning, moderate inward turning, serious inward turning, just
Normal outward turning, slight outward turning, moderate outward turning, the serious type of outward turning eight.
The criterion of heel is in the present embodiment step 10：
- 9 °≤Ang≤0 ° is normal inward turning, and -15 °≤Ang≤- 10 ° are slight inward turning, during -20 °≤Ang≤- 16 ° are
Inward turning is spent, ＜ -20 ° of Ang is serious inward turning；0 ° of ＜ Ang≤9 ° is normal outward turning, and 10 °≤Ang≤15 ° are slight outward turning, 16 °
≤ Ang≤20 ° are moderate outward turning, and 20 ° of Ang ＞ are serious outward turning.
The present invention carries out data acquisition by digitalizer in kind to foot, then using marching cube Marching
Cub methods are judged foot type, realize the purpose of automatic decision foot type, judge foot type by naked eyes relative to prior art and
Speech, overcomes complex operation, the shortcoming of complex steps of naked eyes diagnosis.The invention belongs to industrial class precision, coordinate data is more
It is dense accurate, the reliability of human body foot type diagnosis is improved, accuracy is high, 0 misdiagnosis rate, efficiency high.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent is defined.
Claims (10)
1. outward turning detection method in human body foot type heel, it is characterised in that comprise the following steps：
Step one, the discrete point cloud data of foot to be detected is obtained using digitalizer in kind；
Step 2, trigonometric ratio is carried out using marching cube Marching Cub methods to the foot discrete point cloud data of acquisition,
Generate grid surface；
Step 3, hole repair is carried out to gained grid surface, makes the grid surface generated by trigonometric ratio bent for a closing
Face；
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, and record each layer from initial planar to termination plane to the occluding surface obtained by the step 3
The minimum and maximum transversal point of y-axis coordinate in transversal；
Step 6, it is assumed that the point set that each transversal y-coordinate smallest point obtained by the step 5 is constituted is PA, each transversal y-coordinate is maximum
The point set that point is constituted is PB, then y-coordinate reckling in PA is identified as into external malleolus point, y-axis the maximum in PB is identified as into internal malleolus point,
And then find ankle point inside and outside foot；
Step 7, to cross the plane of medial and lateral malleolus point and normal vector perpendicular to z-axis as cutting plane, asks the friendship of cutting plane and grid surface
Line；
Step 8, finds point A, B where the maximum and minimum value of z coordinate in intersection, and find minimum and maximum positioned at z coordinate
Flex point C, D of y-coordinate maximum and minimum value near value；
Step 9, the midpoint of note A, B point is M1, the midpoint of medial and lateral malleolus point is M2, the midpoint of C, D point is M3, calculating swing angle is carried out,
Specific formula is as follows：
Wherein, Ang represents swing angle, M3(y) M is represented3The y values of point, M2(y) M is represented2The y values of point；
Step 10, the swing angle value that the step 9 is tried to achieve is compared with outward turning criterion in foot, and then judges heel
Interior outward turning type.
2. outward turning detection method in human body foot type heel according to claim 1, it is characterised in that in the step one
Digitalizer in kind 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 characterised in that the step one is used
When digitalizer in kind carries out data acquisition, data acquisition is highly more than the higher person in anklebone inside and outside human foot to be detected
20-100mm。
4. outward turning detection method in human body foot type heel according to claim 3, it is characterised in that the step one is used
When digitalizer in kind carries out data acquisition, data acquisition is highly more than the higher person in anklebone inside and outside human foot to be detected
50mm。
5. outward turning detection method in human body foot type heel according to claim 1, it is characterised in that office in the step 4
Portion establishment of coordinate system method is concretely comprised the following steps：Baseplane is taken fully for XOY plane, the XOY that the side of shank is pointed to by vola is put down
Face normal vector is local coordinate system z-axis positive direction, and the unit vector for pointing to tiptoe direction in XOY plane and by vola is x
Axle positive direction, y-axis is determined perpendicular to X-axis, y-axis positive direction according to right-handed coordinate system rule.
6. outward turning detection method in human body foot type heel according to claim 1, it is characterised in that risen in the step 5
Beginning plane be z=10-60mm, terminations plane be z=80-200mm, and by interval height of 0.5-3mm from initial planar to
Terminate plane and transversal is carried out to the occluding surface obtained by the step 3.
7. outward turning detection method in human body foot type heel according to claim 6, it is characterised in that risen in the step 5
Beginning plane is z=50mm, and termination plane is z=100mm, and by interval height of 1mm from initial planar to termination plane pair
Occluding surface obtained by the step 3 carries out transversal.
8. outward turning detection method in human body foot type heel according to claim 1, it is characterised in that right in the step 5
It is in the specific method for solving of occluding surface progress transversal operation：
First, three summits of each triangle in grid surface are brought into the sign of SECTION EQUATION and result of determination；
Further, if three summit jack per lines, prove that current triangle is non-intersect with plane, exit flow；If contrary sign,
The intersection point of Atria bar side and plane is then calculated respectively, there must be two intersection points to fall on triangle；
Further, the intersection point of gained is joined end to end, generates closed curve.
9. outward turning detection method in human body foot type heel according to claim 1, it is characterised in that pin in the step 10
With type be divided into normal inward turning, slight inward turning, moderate inward turning, serious inward turning, normal outward turning, slight outward turning, moderate outward turning, sternly
The type of outward turning eight again.
10. outward turning detection method in human body foot type heel according to claim 9, it is characterised in that in the step 10
The criterion of heel is：- 9 °≤Ang≤0 ° is normal inward turning, and -15 °≤Ang≤- 10 ° are slight inward turning, -20 °≤Ang
≤ -16 ° are moderate inward turning, and ＜ -20 ° of Ang is serious inward turning；0 ° of ＜ Ang≤9 ° is normal outward turning, and 10 °≤Ang≤15 ° are light
It is outside one's consideration rotation, 16 °≤Ang≤20 ° are moderate outward turning, 20 ° of Ang ＞ are serious outward turning.
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| CN201510174394.7A CN104856681B (en) | 2015-04-14 | 2015-04-14 | Outward turning detection method in human body foot type heel |
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| CN201510174394.7A CN104856681B (en) | 2015-04-14 | 2015-04-14 | Outward turning detection method in human body foot type heel |
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| CN105976406B (en) * | 2016-04-26 | 2019-04-23 | 上海时元互联网科技有限公司 | Measuring system, measuring device and foot shape measurement method and system |
| CN115500816B (en) * | 2022-10-10 | 2025-02-11 | 西安福音康复健康产业有限公司 | A calcaneal measurement method and a method for digitizing and customizing an orthosis |
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| US7582064B2 (en) * | 2003-03-25 | 2009-09-01 | Michael Martindale | System and method for foot assessment |
| GB0505038D0 (en) * | 2005-03-11 | 2005-04-20 | Rsscan Internat | Method and apparatus for displaying 3D images of a part of the skeleton |
| US7392559B2 (en) * | 2005-04-28 | 2008-07-01 | Esoles L.L.C. | Method and apparatus for manufacturing custom orthotic footbeds |
| US7493230B2 (en) * | 2006-06-06 | 2009-02-17 | Aetrex Worldwide, Inc. | Method and apparatus for customizing insoles for footwear |
| US8479405B2 (en) * | 2010-09-30 | 2013-07-09 | Marie Smirman | Measurement system for varus/valgus angles in feet |
| DE102011007678A1 (en) * | 2011-04-19 | 2012-10-25 | Fachhochschule Stralsund | Measurement system for determining biometric data of human foot of children during shoe purchase, aligns human foot on boundary surface with respect to measurement coordinate system |
| US20130296740A1 (en) * | 2012-05-07 | 2013-11-07 | Kent S. Greenawalt | Method and Apparatus for Analyzing Foot Arch Deterioration |
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