CN109558665A - A kind of automatic design method of personalized flexible nose support - Google Patents
A kind of automatic design method of personalized flexible nose support Download PDFInfo
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- CN109558665A CN109558665A CN201811400887.8A CN201811400887A CN109558665A CN 109558665 A CN109558665 A CN 109558665A CN 201811400887 A CN201811400887 A CN 201811400887A CN 109558665 A CN109558665 A CN 109558665A
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- G—PHYSICS
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a kind of automatic design methods of personalized flexible nose support, comprising: (1) obtains the model of nasal area in face, the point for obtaining the region converges conjunction；(2) the bracket master pattern for selecting flexible nose support, by model be divided into rigid body nose support seating portion, nose support seating face part, can deformation part and base part；(3) stipule surface is sampled, sampled point is mapped in the local coordinate system of nose support seating face part foundation；(4) spectacle frame model is selected, bracket locations are initialized；(5) conjunction, bracket locations and mapping relations are converged according to nasal area point, stipule sampled point is gradually moved to the nasal surfaces near the point using the method that iteration furthers, and update bracket grid；After the completion of iteration, bracket master pattern is merged with spectacle frame master pattern, completes the design of flexible nose support.Flexible nose support of the invention, it is high with the laminating degree of nose according to the nose shape Automatic Optimal of user, adapt to the asymmetry of face.
Description
Technical field
The invention belongs to eyeglass designs, manufacture technology field, are specifically related to a kind of individual character based on face three-dimensional measurement
Change the automatic design method of flexible nose support.
Background technique
Nose support is the component that spectacle frame plays a supportive role on the bridge of the nose, is had for the wearing comfort and aesthetics of glasses
Highly important influence.It is divided from adjustable degree, the nose support design method of existing glasses can be divided into that fixed is general to be set
Meter, design-adjustable and personalized customization design three kinds.
Fixed universal design is mainly used for metalloid spectacle frame, and design is the typical bridge of the nose number according to target group
According to come the shape and parameter that determine a set of fixation, i.e., so-called " version type ", the general nose support design of fixed cannot provide adjusting
Possibility, user will select oneself comfortable wearing in numerous editions types.
Design-adjustable can be further divided into stipule active type and two kinds of mechanism adjustment type.The nose support of stipule active type
It is mainly used in metal frame, this kind of nose support is made of two parts, and one is stipule, and one is trailing arm.Stipule part is by blade and support stake
It constitutes, support stake is embedded by substrate and is fixed in blade.Trailing arm is also to be made of two parts, and one is support stalk, and one is stake box,
Support stalk is the interconnecting piece of mirror holder ontology (Jing Quan or beam) and stake box, and stake box is the component for accommodating support stake.Stipule and trailing arm by means of
Screw is configured to an entirety, this is integrated with certain adjustment space, including nose support height, blade angle and blade and mirror
The relative position etc. of frame.Using fixing screws as axis, stipule can do in certain angle (usually left and right 20~40 degree, upper and lower 10
~30 degree) natural adjustment.Stipule active type nose support is usually required when glasses are delivered by optician's shop staff by profession
Tool suitably adjusts its structure, and adapts to the nose-shaped of different user by the natural adjustment capability of stipule.Stipule
The adjustment of the nose support of active type needs experienced operator and professional tool, in order to solve this problem, there has been proposed
A kind of adjustable nose support (conveniently adjusted spectacle pad bridge disclosed in the utility model referring to Publication No. CN207586567U
Support；A kind of glasses of adjustable nose rest disclosed in the utility model of Publication No. CN207833134U；Publication No.
A kind of nose support adjustable height glasses disclosed in the utility model of CN207924283U；Sports spectacles manufacturer Rudy
360 degree bilateral adjustable Ergonose XI nose supports that Project was released in 2017) design, basic thought is sharp
With mechanical structures such as gear, threaded rods, the adjusting of the parameters such as nose support height, direction is realized.The problem of this kind of design, is still
Manual adjustment is needed, although the process adjusted may not need specific purpose tool.And it is adjusted due to being introduced in nose piece portion
Mechanical structure, so more complicated compared to making for above-mentioned stipule active type nose support, price is also higher.
With the commercialization of 3-D scanning technology, the face's threedimensional model for obtaining user becomes easy and popularizes, in this base
On plinth, there has been proposed personalized customization mirror holders and nose support based on face three-dimensional measurement (referring to Publication No.
A kind of spectacle frame design method based on face three-dimensional measurement disclosed in the patent of invention of CN105842875A), this method according to
The faceform of three-dimensional measurement and characteristic point generate personalized customization nose support for each user, due to nose support shape be according to
The nose-shaped generation of user, the nose support of this personalized customization design without manual adjustment can be achieved with user's shape of face from
Dynamic fitting.The mirror holder model ultimately generated is produced by way of 3D printing.This personalized customization based on 3D printing is set
The problem of meter is, due to mirror holder model cannot finally be printed by mold 3D could be complete with acceptable cost
At production, the 3D printing material for mirror holder needs certain hardness, and at present the 3D printing technique of mixing material still not at
It is ripe, therefore nose support is hard material as mirror holder, this allows for wearing comfort and is affected.Traditional eyewear, which has, to be passed through
Silicagel pad improves the scheme of wearing comfort, however the thickness of silicagel pad will affect the laminating degree of nose support, and due to
The shape of personalized customization nose support be it is unfixed, this also brings very big difficulty to the design of silicagel pad.
Aspect is designed and manufactured in nose support, needs a kind of compactness good at present, there is material flexibility can guarantee to wear
Comfort is simple to manufacture simultaneously, low-cost new technology.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of automatic design method of personalized flexible nose support, the party
Method can be automatically generated and be bonded with user's shape of face according to existing user's three-dimensional face model and corresponding spectacle frame standard component
Flexible nose support.
A kind of automatic design method of personalized flexible nose support, includes the following steps:
(1) point for obtaining nasal area department pattern and the region in face converges conjunction；
(2) the bracket master pattern of flexible nose support is selected to be divided into model according to model parameter: for being embedded in stipule
Rigid body nose support seating portion, the nose support seating face part being bonded with stipule, can deformation part and the base portion fixed with mirror holder
Point；
(3) the stipule surface of bracket to be embedded into is sampled, and obtained stipule sampled point is mapped to nose support seat
In the local coordinate system that surface portion is established；
(4) master pattern or customizing model for selecting spectacle frame, initialize bracket locations, make the base part of bracket with
Predeterminated position on spectacle frame fits；
(5) the nasal area point obtained according to step (1) converges the bracket locations in conjunction and step (4), uses iteration
Stipule sampled point is gradually moved to the nasal surfaces near the point by the method to further, and calculates nose support according to mapping relations
The position of seating face part updates bracket grid；After the completion of iteration, bracket master pattern is merged with spectacle frame master pattern,
The complete frame network synthesized completes the design of flexible nose support；
It is selectable, select 3D printing method to carry out the production that flexible nose support includes spectacle frame.
Step (1) specifically includes:
(1-1) obtains the three-dimensional grid model and three-dimensional facial features point set of human face region using method for three-dimensional measurement；
(1-2) reads two nasal side points, bridge of the nose point position in the three-dimensional grid model of human face region；
The rectangle that (1-3) is constituted according to this four points plucks out the corresponding position in three-dimensional grid model as nasal area
Department pattern, this part are the bonding position of stipule.
In step (1-1), the three-dimensional measurement of face can be realized using various ways, preferably, following sides can be passed through
Method one or more of combination obtain the three-dimensional grid model of human face region:
1) binocular or the stereo vision imaging method of more mesh cameras are utilized；
2) the 3-D scanning method based on structure light；
3) the 3 D laser scanning method based on range of triangle；
4) based on the 3-D scanning method of flight time ranging.
In step (2), the model parameter includes position of following each regions in the bracket coordinate system of setting, tool
Body are as follows: the base region that bracket intersects with frame, the nose support seat region for being embedded in stipule part, nose support seat hollow out region
And the nose support seating face region being bonded with stipule；These parameters are given by the designer of nose holder, in the form of bounding box
It provides.
Usually, each region in step (2), will not be the cuboid or rectangle of standard, in order to reduce design side
Label cost, being approached with cuboid or rectangle indicates these regions.The designer of bracket master pattern needs to provide rectangular
The vertex of body or rectangle, wherein the base region that bracket intersects with frame is the rectangle of 4 vertex control, for being embedded in stipule
Partial nose support seat region be 8 vertex control cuboid, nose support seat hollow out region be 8 vertex control cuboid,
The nose support seating face region being bonded with stipule is the rectangle of 4 vertex control.
Preferably, the bracket coordinate system is using the point that nose support seat axis intersects with its surface as coordinate origin, nose
The longer direction of bracket is Y-axis, and short direction is X-axis, and setting Z axis makes the Z coordinate of bracket model all the points be positive.In this way
The bounding box that provides of coordinate system be largely aligned with axis, effectively improve the accuracy and robustness of next step.
Step (2) specifically includes:
(2-1) seeks the rigid body nose support seating portion of bracket master pattern；
In the process of Automated Design, in order to guarantee in master pattern, the nose support seat for being embedded in stipule does not occur excessive
Deformation, need this part being set as rigid body.
According to the corresponding bounding box of the corresponding region of reading, the point in bounding box is found out, records these points in master die
Subscript in type data is denoted as the rigid body portion of master pattern.
(2-2) seeks nose support seating face part；
On nose it is stipule due to really fitting to, in order to reduce calculation scale, does not need to join on the model of stipule
With calculating, but nose support seating face part by being bonded with stipule calculates indirectly.
According to the surface region bounding box of reading, the point in bounding box is found out, the subscript of these points is recorded, is denoted as mark
The surface portion of quasi-mode type.
(2-3) in the process of Automated Design, in order to guarantee that bracket is fixed on the appropriate position on frame, according to reading
Intersecting area bounding box, find out these point subscript, be denoted as fixed point.
(2-4) remainder is that nose holder can deformation part.
Since in computer, expression floating number has error, preferably, being included accordingly in order to which step (2) can determine
Point in bounding box needs slightly to expand bounding box one small Delta distance, so to make way on bounding box
Point also can be recorded smoothly.
Specific step is as follows for step (3):
(3-1) constitutes sampling point set along stipule surface uniform sampling several points, by sampling point set Linear Mapping to nose support
On seating face partial dot；
(3-2) is built with the method for farthest point sampling in three points of the nose support seating face part of bracket master pattern selection
Found a local coordinate system；The method for building up of local coordinate system is as follows:
Using first point as the origin of coordinate system, the unitization vector of the difference of second point and origin is used as x-axis
The difference and x-axis multiplication cross of third point and origin, obtain z-axis, are finally multiplied with z-axis and x yoke, obtain y-axis, this defines
One local coordinate system (3-3) established with the point of surface portion is calculated sampled point under world coordinate system and is mapped to nose support
The difference vector of the point of frame surface portion, the difference vector calculated is indicated with local coordinate system.
In this way after moving entire bracket, or can be by three points and local coordinate system difference vector of sampling, to weigh
It is new to calculate stipule sampled point.
In step (4), spectacle frame model can choose the master pattern inside model library, be also possible to according to face spy
The model that sign and user preferences customize in advance, what the model of customization can be automatically generated, it can also manually generate.
The step of initializing bracket locations is as follows:
(4-1) calculates the center of the top base of bracket, calculates the conversion square of the predeterminated position on from center to spectacle frame
Battle array, using the mobile entire bracket of the transition matrix, so that the center of top base is overlapped with predeterminated position；
(4-2) calculates the normal vector of top base and the normal vector of predeterminated position, a spin matrix is calculated, so that upper base
Seat normal vector by rotation after it is contrary with the normal vector of predeterminated position, after the matrix rotation bracket, top base with
Predeterminated position fitting；
What (4-3) found out top base center and bottom base center moves towards unit vector, then finds out spectacle frame corresponding position
Unit vector is moved towards, a spin matrix is calculated, so that pedestal trend moves towards identical with spectacle frame after rotation, utilizes the matrix
After rotary bracket, bottom base is bonded with spectacle frame.
Step (5) specifically includes:
(5-1) calculates initialization bracket locations post-sampling point set according to the difference vector of the local coordinate system in step (3)
World coordinates；
(5-2) finds and the nearest point of step (1) nasal area partial distance, then root each point in sampling point set
According to the difference vector of local coordinate system, when calculating sampled point is overlapped with closest approach, the corresponding point set of surface point is denoted as constraint point set；
(5-3) is gradually segmented surface point by alternative manner toward obligatory point movement, and updates bracket network, is moved every time
After dynamic, constraint point set is recalculated；
(5-4) when iteration convergence or when reaching preset the number of iterations, by bracket master pattern and spectacle frame master die
Type merges, the complete frame network synthesized.
Wherein, it in step (5-3), when updating bracket network, is solved using Laplacian Deformation method
The vertex position of various pieces on bracket, in order to guarantee when iteration, the variation of non-rigid does not occur for nose support seating portion,
By the way that the biggish Laplacian weight of rigid body nose support portions branch is arranged, to reach while solve band position constraint and rigid body about
The optimization of beam.
According to the difference of the number of iterations and convergent, in Laplacian Deformation method, the reality of use
Border obligatory point can pre-process.At the beginning of iteration, physical constraint point is that the obligatory point entirety solved is moved along respective normal direction
Point after dynamic certain distance physical constraint point and solves obligatory point apart from closer as the number of iterations increases, when back segment iteration,
The obligatory point that physical constraint point is just to solve for.Adopt be in such a way in order to during Laplacian Deformation,
It prevents certain moving distances excessive, causes to solve the phenomenon that bracket mesh quality is deteriorated.
After the completion of entire frame designs, usable existing method carries out the production of complete frame, for example, by using 3 D-printing
Technology, typical three-dimensional printing technology include Selective Laser Sintering or stereolithography apparatus technology etc..
After frame has printed, by the region of hollow out on the support stake insertion nose support seat of the standard component of stipule, the blade of stipule is just
It is fitted in nose support seating face region well.While method of the invention ensure that stipule can be bonded nose, nose support seat will not be sent out
Raw deformation.
Compared with prior art, the beneficial effects of the present invention are embodied in:
1. flexible nose support of the invention, high with the laminating degree of nose according to the nose shape Automatic Optimal of user, fit
Answer the asymmetry of face；
2. nose support of the invention almost automatically generates, as long as user understands roughly the meaning of parameters, Ji Kecao
Make；
3. the present invention is simple to manufacture on the whole, low in cost, manufacturing time is greatly shortened.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the automatic design method of personalized flexible nose support of the present invention；
Fig. 2 is the schematic diagram that the present invention finds out nasal area point in three-dimensional face model using characteristic point；
Fig. 3 illustrates specification coordinate system bottom bracket model and given bounding box: being (a) top view of bracket；(b) it is
Visual Angle in Perspective figure；It (c) is bottom view；It (d) is side view；
Fig. 4 illustrates the sampled result of stipule: (a) for along the sampling of nose support seat long axis direction；It (b) is short along nose support seat
The sampling of axis direction；
Fig. 5 illustrates initialization bracket locations process: being (a) first moved further nose holder position view；It (b) is first
Secondary rotation nose holder position view；It (c) is second of rotation nose holder position view；
Fig. 6 illustrates iteration and furthers nose support process；It (a) is the position of nose holder and stipule sampled point before iteration；(b) it is
Comparison diagram before iteration 5 times and iteration；(c) it is completed and comparison diagram before iteration for iteration；
Fig. 7 is the different angle schematic diagram for the frame being finally synthesizing；
The glasses different angle real scene shooting figure that Fig. 8 is finally completed the process.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawings and examples, it should be pointed out that reality as described below
It applies example to be intended to convenient for the understanding of the present invention, and does not play any restriction effect to it.
As shown in Figure 1, a kind of automatic design method of personalized flexible nose support, including nose model 101 is read, it reads
Nose support model and parameter 102, sampling stipule 103, initialization nose support position 104, iteration further nose support 105, divide below
The other embodiment details to each step describe in detail.
1. nose model is read, with reference to Fig. 2:
(1-1) reads the faceform of target object and uses the calculated individual features point set of other methods.
(1-2) finds a smallest rectangle from front view, just includes point 106, point 107, point 108 and point 109.
(1-3) model is in the case where facing angle of field, and the point in rectangle is exactly nose model used in the present invention, i.e.,
The domain in the region that stipule should be bonded.
2. nose support model and parameter are read, with reference to Fig. 3:
After nose support form design teacher completes nose support design, the parameter by nose support model is needed to provide, so as to this hair
Bright automatic design method uses.Designer first carries out the setting of coordinate system to nose support, is intersected with nose support seat axis with its surface
Point as coordinate origin, the longer direction of nose support seat is Y axis, and short direction is X-axis, and setting Z axis makes bracket model all the points
Z coordinate be positive.
Coordinate system bottom bracket model and given bounding box such as (a) in Fig. 3, (b), (c), shown in (d), calibration is all
It is the reference axis of positive direction.The rigid body portion of bracket is specified with axial symmetry bounding box, i.e., nose support seating portion in figure；Hollow-out part
For calculating the mapping relations of sampled point, and it is specified with an axial symmetry bounding box；Surface portion is nose support seat Z coordinate etc.
It is specified with the bottom surface of rigid body portion bounding box in 0 point；Fixed part is the base region shown in figure, is referred to rectangle
It is fixed；Rest part is can deformation part.
Due to bounding box be it is axisymmetric, determine whether the point in bounding box only with the three-dimensional coordinate of checkpoint is in area
In.Determine that the specified region of rectangle is by judging a little whether on the face of rectangle.
3. stipule surface samples, with reference to Fig. 4:
(a) is illustrated along long axis uniform sampling point in Fig. 4, (b) is illustrated along short axle uniform sampling point.Long axis is adopted in figure
10 sections of sample, short axle has sampled 8 sections, i.e., sampled 99 points in total.One linear mapping is done to sampled point, forms 99
The point pair that sampling point set { sample_pos_i }, surface point subscript collection { surface_idx_i } combine, calculates these points pair
Difference vector collection { Vec_wi }.
Using the method for farthest point sampling, nose holder model surface part choose three point coord1, coord2,
Coord3 records their subscript, using first point as the origin of coordinate system, the difference of second point and origin it is unitization
Vector obtains z-axis with the difference and x-axis multiplication cross of third point and origin as x-axis, finally uses z-axis and x-axis multiplication cross, obtains y
Axis, the local coordinate system that this defines one to be established with the point of surface portion.By x, y, z-axis constitutes one as column vector
A matrix M_r.
The difference under local coordinate system is obtained with the transposition premultiplication Vec_wi of matrix M_r for difference vector collection { Vec_wi }
Vector set { Vec_oi=(M_r)T*Vec_wi}.The difference vector collection can be used to after nose support seat is mobile, recalculate stipule
The position of sampled point.
4. nose support position is initialized, with reference to Fig. 5:
(a) is first moved further nose holder position view in Fig. 5, and specific method is: calculating one of base in Fig. 3
The center of seat, using the pedestal that be finally fitted in frame upper part in example diagram；The mirror specified then according to user
Frame position, mobile entire nose holder, so that the center of pedestal is overlapped with designated position.
(b) is to rotate nose holder position view for the first time in Fig. 5, it can be seen that after rotation, top base and frame are
Through being bonded, specific method is: calculating the normal vector for the pedestal being overlapped with frame position, while calculating frame corresponding position
Normal vector；Then around the center of pedestal, entire nose holder is rotated, so that the two normal vectors are just the opposite.
(c) is second of rotation nose holder position view in Fig. 5, it can be seen that after rotation, at the beginning of entire nose holder
Beginning position is correct, and specific method is: according to the center of bottom base and top base center distance D, finding out one in frame
Point P, which is also D at a distance from top base center；Then around the center of top base, entire nose holder is rotated, so that lower base
Seat center is overlapped with P point on frame.
The nose support 5. iteration furthers, with reference to Fig. 6:
(5-1) according to surface point in step 3 { surface_idx_i } and local coordinate system point coord1, coord2,
Difference vector collection { Vec_oi } under coord3 and local coordinate system, recalculates sampling point set { sample_pos_i },
In Fig. 6, stain part is i.e. after initializing bracket locations in (a), the position of stipule sampled point；
In the nasal area point that (5-2) is found in step 1, every bit in sampling point set { sample_pos_i } is looked for
To apart from nearest point set { target_pos_i }, then pass through surface point { surface_idx_i } and local coordinate system point
Difference vector collection { Vec_oi } under coord1, coord2, coord3 and local coordinate system calculates constraint point set
The meaning of { constraint_pos_i }, the point set are that after surface point is moved to obligatory point, sampled point is overlapped with closest approach.
(5-3) is gradually segmented surface point toward obligatory point movement, and update bracket grid by the method for iteration.Every time
After movement, constraint point set is all recalculated.(b) illustrates the comparison diagram after initialization and iteration 5 times in Fig. 6.In Fig. 6 (c)
Illustrate the comparison diagram after initialization and iteration completion, it can be seen that after the completion of iteration, sampled point and nose are substantially
Fitting completely.
(5-4) using constrain point set as constraint, using Laplacian Deformation method (referring to http: //
Study course or text in www.cse.wustl.edu/~taoju/cse554/lectures/lect08_Deformation.pdf
Offer Cohenor D.Laplacian surface editing [C] //Eurographics/acm Siggraph Symposium
On Geometry Processing.ACM, 2004.), Laplacian restricted model is established, is asked by solution system of linear equations
Solve the position on other vertex on bracket.In solution procedure, in order to guarantee when iteration, nose support seating portion does not occur non-
The variation of rigid body, to nose support seat, i.e. the other points of the ratio that the Laplacian weight of rigid section branch can be arranged it is big, pass through this
The Laplacian Deformation that kind method carries out, the character of rigid body of nose support seat is protected in the process, same to reach
When solve the optimization problem with position constraint and Rigid Constraints.
(5-5) is used according to the difference of the number of iterations and convergent in Laplacian Deformation method
Physical constraint point can pre-process.In iteration front half section, physical constraint point is the obligatory point of solution integrally respectively along respective method
To the point after moving a certain distance, this distance reduces as the number of iterations increases, and when back segment iteration, physical constraint point is just
The obligatory point being to solve for.Such method can make will not in the moving distance at Laplacian Deformation process midpoint
It is excessive, it both avoids solving the case where bracket mesh quality is deteriorated, it helps solve more correct constraint point set.
After the completion of (5-6) iteration, by bracket model and frame models coupling, result frame is obtained.(a) in Fig. 7, (b) and
It (c) is the schematic diagram under three angles of frame for being finally synthesizing, black color dots are the position of iteration post-sampling point, are considered as, left
Right stipule is all bonded with nose.
6. 3 D-printing
According to the three-dimensional grid model for the frame that abovementioned steps generate, is formed using three-dimensional printing technology and generate mirror in kind
Frame, typical three-dimensional printing technology such as selective laser sintering (Selective Laser Sintering, SLS, referring to Baidu
" selective laser sintering " entry of encyclopaedia) technology or stereolithography apparatus (Stereo Lithography
Apparatus, SLA, referring to " Stereolithography " entry of Baidupedia) technology etc..
After frame has printed, by the region of hollow out on the support stake insertion nose support seat of the standard component of stipule, the blade of stipule is just
It is fitted in nose support seating face region well.
Using method of the invention, the mirror holder for designing generation is printed using SLA method, and install the standard component of stipule with
And eyeglass, after post-production, effect is as shown such as (a), (b) and (c) in Fig. 8.Three-dimensional measurement object wears this mirror holder can
Reach extraordinary compactness, it is difficult to slide after putting on.The nose of the object there is a situation where left-right asymmetry, and give birth to
At mirror holder can be well adapted for this asymmetry, be bonded its nose completely.
Technical solution of the present invention and beneficial effect is described in detail in embodiment described above, it should be understood that
It is above is only a specific embodiment of the present invention, to be not intended to restrict the invention, all institutes in spirit of the invention
Any modification, supplementary, and equivalent replacement done, should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of automatic design method of personalized flexible nose support characterized by comprising
(1) point for obtaining nasal area department pattern and the region in face converges conjunction；
(2) the bracket master pattern of flexible nose support is selected to be divided into model according to model parameter: for being embedded in the rigid body of stipule
Nose support seating portion, the nose support seating face part being bonded with stipule, can deformation part and the base part fixed with mirror holder；
(3) the stipule surface of bracket to be embedded into is sampled, and obtained stipule sampled point is mapped to nose support seating face
In the local coordinate system that part is established；
(4) master pattern or customizing model for selecting spectacle frame, initialize bracket locations, make the base part and spectacle frame of bracket
On predeterminated position fit；
(5) the nasal area point obtained according to step (1) converges the bracket locations in conjunction and step (4), is furthered using iteration
Method stipule sampled point is gradually moved to the nasal surfaces near the point, and calculate nose support seating face according to mapping relations
Partial position updates bracket grid；After the completion of iteration, bracket master pattern is merged with spectacle frame master pattern, is closed
At complete frame network, complete the design of flexible nose support；
It is selectable, select 3D printing method to carry out the production that flexible nose support includes spectacle frame.
2. the automatic design method of personalized flexible nose support according to claim 1, which is characterized in that step (1) is specific
Include:
(1-1) obtains the three-dimensional grid model and three-dimensional facial features point set of human face region using method for three-dimensional measurement；
(1-2) reads two nasal side points, bridge of the nose point position in the three-dimensional grid model of human face region；
The rectangle that (1-3) is constituted according to this four points plucks out the corresponding position in three-dimensional grid model as nasal area part
Model.
3. the automatic design method of personalized flexible nose support according to claim 1, which is characterized in that in step (2), institute
Stating model parameter includes position of following each regions in the bracket coordinate system of setting, specifically: bracket intersects with frame
Base region, the nose support seat region for being embedded in stipule part, the region of nose support seat hollow out and the nose support seat that is bonded with stipule
Surface region；These parameters are given by the designer of nose holder, are provided in the form of bounding box.
4. the automatic design method of personalized flexible nose support according to claim 3, which is characterized in that the bracket is sat
Using the point that nose support seat axis intersects with its surface as coordinate origin, the longer direction of nose support seat is Y-axis for mark system, and short direction is X
Axis, setting Z axis make the Z coordinate of bracket model all the points be positive.
5. the automatic design method of personalized flexible nose support according to claim 1, which is characterized in that the tool of step (3)
Steps are as follows for body:
(3-1) constitutes sampling point set along stipule surface uniform sampling several points, by sampling point set Linear Mapping to nose support seat table
In facial branch；
(3-2) establishes one in three points of the nose support seating face part of bracket master pattern selection with the method for farthest point sampling
Local coordinate system；
(3-3) calculates sampled point under world coordinate system and the difference vector for being mapped to the point of nose holder surface portion, will calculate
Difference vector indicated with local coordinate system.
6. the automatic design method of personalized flexible nose support according to claim 1 or 5, which is characterized in that step (4)
In, initialize bracket locations the step of it is as follows:
(4-1) calculates the center of the top base of bracket, calculates the transition matrix of the predeterminated position on from center to spectacle frame, utilizes
The mobile entire bracket of the transition matrix, so that the center of top base is overlapped with predeterminated position；
(4-2) calculates the normal vector of top base and the normal vector of predeterminated position, a spin matrix is calculated, so that the method for top base
Vector is contrary with the normal vector of predeterminated position after rotation, after the matrix rotation bracket, top base and default position
Set fitting；
What (4-3) found out top base center and bottom base center moves towards unit vector, then finds out the trend of spectacle frame corresponding position
Unit vector calculates a spin matrix, so that pedestal trend moves towards identical with spectacle frame after rotation, utilizes the matrix rotation
After bracket, bottom base is bonded with spectacle frame.
7. the automatic design method of personalized flexible nose support according to claim 5, which is characterized in that step (5) is specific
Include:
(5-1) calculates the world of initialization bracket locations post-sampling point set according to the difference vector of the local coordinate system in step (3)
Coordinate；
(5-2) to each point in sampling point set, find with the nearest point of step (1) nasal area partial distance, further according to office
The difference vector of portion's coordinate system, when calculating sampled point is overlapped with closest approach, the corresponding point set of surface point is denoted as constraint point set；
(5-3) is gradually segmented surface point by alternative manner toward obligatory point movement, and updates bracket network, every time after movement,
Again constraint point set is solved；
(5-4) closes bracket master pattern and spectacle frame master pattern when iteration convergence or when reaching preset the number of iterations
And the complete frame network synthesized.
8. the automatic design method of personalized flexible nose support according to claim 7, which is characterized in that in step (5-3),
When updating bracket network, the vertex position of various pieces on bracket is solved using Laplacian Deformation method, is asked
Relatively large Laplacian weight is arranged to rigid body nose support portions branch when solution.
9. the automatic design method of personalized flexible nose support according to claim 7, which is characterized in that start in iteration
When, physical constraint point be solve obligatory point integrally respectively along respective normal direction move a certain distance after point, with the number of iterations
Increase, physical constraint point with to solve obligatory point distance closer, in the iteration later period, obligatory point that physical constraint point is just to solve for.
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