CN100442314C - Design method for personalized brassiere cup seam dart in three-dimensional virtual chest form environment - Google Patents
Design method for personalized brassiere cup seam dart in three-dimensional virtual chest form environment Download PDFInfo
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- CN100442314C CN100442314C CNB2006101166705A CN200610116670A CN100442314C CN 100442314 C CN100442314 C CN 100442314C CN B2006101166705 A CNB2006101166705 A CN B2006101166705A CN 200610116670 A CN200610116670 A CN 200610116670A CN 100442314 C CN100442314 C CN 100442314C
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Abstract
The disclosed individual brassiere cup measurement method in 3D virtual breast shape environment comprises: 1. building basic breast shape model; 2. creating women breast shape model database; 3. expanding the 2D cup measurement in 3D virtual environment. Based on 3D body surface scanning data and feature parameter, this invention simulates special body 3D breast shape and molded shape to fast obtain matched cup measurement, reduces design cost, and satisfies individual request.
Description
Technical field
The invention belongs to the cup seam dart method for designing in the brassiere production making sheet process, particularly a kind of in three-dimensional virtual chest form environment, the province that three-dimensional personalized chest cup is launched into two-dimentional bra cup measures the body method for designing.
Background technology
Brassiere is the most intimate enjoyment of women and care, slight brassiere need cling to the body after because of its dressing, moulds the chest type, not come off, not tight again, make the bra cup paper pattern design, especially the design of province's amount is considered to influence one of brassiere fitness key factor and highly difficult technology always.The general method of sample of using repeatedly of brassiere plate-making is improved pattern traditionally, and efficient is low and fitness is poor, and is even if construct conventional chest shape model solution cup seam dart, also very big to the intractability of special chest shape.
Three-dimensional female chest model is the basis and the essential condition of the fit brassiere of design, yet, lay in not only costliness but also unrealistic of enough true people's moulds.Along with the increase of consumer to clothes fitness degree of concern, a large amount of researchers join in 3 D human body modeling field, although there have been many scholars to set foot in the hand of human body, leg, facial, the modeling of organ structure and whole human body, every kind of modeling all has the specific use of its specific area, but the rare refinement that relates to the personalized three-dimensional women chest shape model bank that is specifically designed to the brassiere design realizes, especially adopt in three-dimensional virtual chest form environment, realize that the province that three-dimensional personalized chest cup is launched into two-dimentional bra cup measures the body method for designing, reaches the optimum efficiency of fit brassiere paper pattern design.
Summary of the invention
The present invention will overcome traditional experience plate-making and the repetition test method that lacks scientific basis and guidance, solve the technical matters of bra cup fitness difference, provide a kind of based on three-dimensional virtual chest form environment, realize that the province that three-dimensional personalized chest cup is launched into two-dimentional bra cup measures the body method for designing, the brassiere design concept that embodies that people-oriented avoids laying in a large amount of entity chest mould present situations, reduces cost, raise the efficiency, satisfy the fit brassiere production demand of customizing that grows with each passing day.
For achieving the above object, the present invention is achieved in that
The method for designing of personalized brassiere cup seam dart in a kind of three-dimensional virtual chest form environment, concrete steps are:
1. set up the basic chest shape model of three-dimensional female body trunk:
At first carrying out trunk based on 3 D human body surface scan data and B-spline surface Modeling Technology is the modeling of basic chest shape; On short transverse trunk is divided into several layers, obtains 3 D human body curved surface data battle array, the data on every layer of curve join end to end and guarantee the curve sealing; Adopt then
2. make up women's chest shape model bank:
The Dirichlet Free Transform technology with weight is composed in utilization, designs multi-level chest model, imports new trunk characteristic parameter alternately: chest measurement, under bust girth, the chest dot spacing, breastheight, breastheight is poor, waistline, the waist height, shoulder breadth, shoulder height, the chest weight is out of shape and is modeled as the natural chest shape of specific human body of expectation or the personalized three-dimensional chest shape behind the simulation brassiere plastotype; Described multi-level chest model is made up of relatively independent submodel, and each interlayer has defined constraint and driving relationship: ground floor is made of whole reference mark, forms convex closure and other equally distributed reference mark in convex closure in the periphery; On short transverse, be divided into a plurality of layers, elevation information of every layer of correspondence; Central axis when having two points to be used for determining distortion; The second layer when the trunk surface is dropped at the reference mark, has determined distortion herein by coming the feature reference mark of controlled deformation to be constituted by changing weights or shift position; The 3rd layer is made of local deformation obligatory point and feature reference mark, and the deformation constrain point is to be arranged in the inner or outside reference mark that influences between restrained deformation or control reference mark of being used for of trunk, and this one deck is the basis of specific implementation size distortion;
3. the expansion of two-dimentional cup seam dart in the three-dimensional virtual chest form environment:
According to the area equivalent principle, by the human body surface of triangulation, select for use non-x, y benchmark to launch axis, be that the center is by fan-shaped mode promptly with the Bp point, realize that three-dimensional chest cup to two dimension launches, program is submitted province's amount report to automatically according to stretch-out view, and the cup seam dart of degree of obtaining body design is confirmed chest shape, if it is dissatisfied, the specific chest characteristic parameter of mutual input comprises chest measurement, under bust girth, chest dot spacing, breastheight, breastheight is poor, waistline, waist height, shoulder breadth, shoulder height, chest weights etc. change basic chest shape and reaffirm new chest shape; If satisfied, in the System menu hurdle, select the centre of expansion function, on the three-dimensional chest, click chest point Bp centre of expansion, system launches the two-dimentional cup figure of corresponding three-dimensional chest automatically, and submits cup seam dart and abundance to.
Perhaps cup seam dart directly launches to obtain after according to 3 D human body surface scan data modeling.
The technical characterstic of the inventive method is:
1, the inventive method is carried out the chest modeling based on 3 D human body surface scan data and B-spline surface technology; Utilization is composed to change the multi-level female chest model of Dirichlet Free Transform technique construction of weight; With the area unchangeability is principle; Choose unique fan-shaped datum axis expansion mode, the various chest shapes of simulation in three-dimensional virtual environment, and the fit brassiere cup seam dart that matches with it by the quick design of 3D-2D conversion regime.
2, people-oriented obtains province's metering method in the present invention, is different from the way that in the past subjective experience judgement, repetition test and desirable chest mould make up, more scientific and reasonable.
The technique effect of the inventive method is:
Utilize the method, can be based on 3 D human body trunk surface scan data or breast characteristic parameter, simulate the various chest shapes behind three-dimensional chest shape of specific human body natural and the brassiere plastotype, in virtual environment, obtain the brassiere cup seam dart of the udder texture that matches with it fast, the brassiere design concept that realized that people-oriented, brassiere paper pattern design theoretical foundation is provided, solved the technical matters of bra cup fitness difference, the a large amount of entity chest mould present situations of deposit have been avoided, reduced design cost, improve work efficiency, satisfied the production demand of the fit brassiere of customizing.
Description of drawings
Fig. 1 is the 3 D human body human trunk model that different angles are showed;
Fig. 2 is the reference mark design drawing;
Fig. 3 is that 3D-2D launches synoptic diagram: wherein, be space series triangular plate (a), (b) be triangular plate two-dimensional development figure;
Fig. 4 is the program flow diagram that abstract three-dimensional chest shape storehouse and cup seam dart obtain;
Fig. 5 is the exploded view that various three-dimensional virtual chest forms are realized, wherein, (a) and (g) be based on the true basic trunk chest shape model that the three-dimensional surface scan-data obtains, (b), (c), (d), (e) and (f) be to change by (a), (b) being two breasts promotes breast and (f) carries the dummy model that pushes away chest shape from, (c) two breast gathering, (d) sagging breast, (e), (h) is by the variation of (g) model next specific trunk chest model;
Fig. 6 is bra cup 3D-2D stretch-out view and province's amount distribution results, wherein, (a) is three-dimensional virtual chest form, (b) is corresponding two-dimentional cup stretch-out view, (c) is total province amount and distribution results.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
The principle and the concrete steps of the inventive method are as follows:
One, the foundation of three-dimensional female body trunk:
The most direct method of people's volume modeling is read in outside real human body (Fig. 1) data exactly, and the 3D anthropometric scanning system can produce thousands of human body surface data points, constitutes some cloud raw image.During 3-D scanning, measured body two legs are upright, and bipod is slightly separately concordant with shoulder breadth, and two arms slightly separate trunk, and bare above the waist, second wears smallclothes.Because breast shape is influenced by the trunk form only, thereby the scan-data of human limb can be removed, reduce the complicacy of data processing.Then trunk is carried out the data requirement processing, on short transverse, trunk is divided into several layers, obtain 3 D human body curved surface data battle array Q
I, j, i represents layer, and j represent row, and the assurance curve that joins end to end of the data on every layer of curve seals, and trunk is by the triangular plate model representation.
The present invention proposes with non-uniform rational B-spline curved surface (NURBS) match 3 D human body surface, and according to the parametric surface theory, the odd coordinate of B-spline surface mathematical model is
P wherein
I, jBe the reference mark, N
I, p(u), N
J, q(v) be based on the B spline base function of following knuckling vector U, V.
U＝{0，0，...，0，u
p+1，...，u
m，1，1，...，1} (2)
V＝{0，0，...，0，v
p+1，...，v
n，1，1，...，1} (3)
The B batten is specially adapted to create complicated surface modeling, and therefore, the human trunk model of being built can not influence the characteristic of whole curved surface by revising the reference mark to carry out local modification thus.Fig. 1 is the constructed 3 D human body trunk example of showing from different perspectives.
Two, the structure of women's chest shape model bank
The above three-dimensional human trunk model that obtains only is the bare chest shape under the state of nature.Usually, the chest shape of nature is not to be the desired perfect form that meets current trend, because general chest point is all towards arm, simultaneously owing to terrestrial attraction and sagging.Fortunately female chest is the rheology object, and the fit brassiere of wearing can be put the fat of chest together and be remained on ideal position.For the three-dimensional chest shape of the different builds of simulation under virtual state, or even fashioned into the different aesthetic feelings of expectation or sexy three-dimensional chest shape with one-piece type by brassiere, basic chest model just should be deformed into specific chest shape according to new characteristics of human body's parameter instruction.
1. compose to change the Dirichlet Free Transform technology of weight
Appropriate deformation method is one of gordian technique of the present invention.(Free-Form Deformation, FFD) technology is research and object is represented the important branch of the deformation method that has nothing to do to be widely used in the Free Transform that is proposed the earliest by Sederberg in computer animation and the Geometric Modeling field.Because FFD uses the rectangle local coordinate system, and control mesh must be parallelepipedon, makes this technology can bring the restriction to the control mesh topological structure in use.Farin has proposed to have the Dirichlet Free Transform technology (DFFD) of many advantages, has overcome the defective of traditional deformation technology.It is the local deformation technology that is based upon nature syntople coordinate system; Cancelled restriction, more intuitively controlled deformation to the control mesh topological structure; The advantage that has kept traditional Free Transform technology simultaneously.The present invention has used Dirichlet Free Transform technology dexterously, and composes with variation weight amount, and the distortion that makes the abstract chest shape of women storehouse is intuitive and convenient more.
The Dirichlet Free Transform is based on nature syntople coordinate system (Sibson coordinate), relates to the discrete data interpolation technique of Delaunay subdivision and Voronoi/Dirichlet figure.With the Sibson coordinate in the two dimension is example, given one group of P
i(i=1,2 ... n) point, and carry out the Delaunay subdivision, can obtain corresponding Voronoi/Dirichlet polygon diagram T
i(i=1,2 ... n), if S is the point that drops in the convex closure that participates in subdivision, the Dirichlet polygon that S is ordered is designated as Ts, and the Dirichlet polygon that Ts is corresponding with its abutment points so has crossing zone, is designated as A respectively
i(i=1,2 ... n), these zones are carved up Ts fully.Then the natural syntople coordinate figure of S is defined as:
In the formula
Sibson neighbours' set of point S can be used P
1, P
2..., P
nLinear combination represent
Nature syntople coordinate had both reflected the Sibson neighbours of spatial point and the spatial relation between this point, had also reflected the spatial relation between the Sibson neighbours, had good space interpolation characteristic.Therefore, with the Sibson coordinate as the motion effects factor of Sibson neighbours, if promptly move some or several somes P to a S
i, Δ P
iBe they side-play amounts separately, S ' and S are respectively the locus of a S before and after distortion, the side-play amount of S so
ΔS＝∑u
iΔP
i (6)
Wherein i refers to the point that those have moved.
The reposition S ' of S=S+ Δ S (7)
In order to strengthen or weaken the motion effects of some Sibson neighbour to three dimensions point, the present invention composes with weights W for the component of Sibson coordinate
i(i=1,2 ..., n), then obtain following weighting Dirichlet Free Transform algorithm:
Work as W
i=1, (i=1,2 ..., in the time of n), formula deteriorates to formula (5).
2. multi-level female chest model
Human body modeling method commonly used has surface model, solid model, rigid model and multi-level model etc.In order to be become the personalized virtual chest form of various expectations by basic chest deflection, the present invention adopts multi-level model.It which floor relatively independent submodel is made of, and each interlayer has defined constraint and driving relationship, thereby realizes the distortion from the overall situation to the detail characteristic value.
(1) design of model hierarchy and reference mark (Fig. 2)
The design at reference mark is most important to the validity of model deformation, according to the function at reference mark they is designed to three kinds: whole reference mark, deformation constrain point and feature reference mark.Human torso and all reference mark just are arranged in the structure of following three levels.
Ground floor is made of whole reference mark, and it forms convex closure and other equally distributed reference mark in convex closure in the periphery.On short transverse, be divided into several layers, elevation information of every layer of correspondence.Whole control point set is mainly used to control features such as height, breastheight equal altitudes information and preliminary control degree of enclosing, the central axis when having two points to be used for determining distortion.
The second layer when the trunk surface is dropped at the reference mark, has just determined distortion herein by coming the feature reference mark of controlled deformation to be constituted by changing weights or shift position fully.
The 3rd layer is made of local deformation obligatory point and feature reference mark, and the deformation constrain point is to be arranged in the inner or outside reference mark that influences between restrained deformation or control reference mark of being used for of trunk, and this one deck is the basis of specific implementation size distortion.Fig. 2 is the reference mark design drawing.
(2) chest deformation shape process
The female chest form is described by parameters such as chest measurement, under bust girth, breastheight, chest dot spacings usually, therefore, the trunk height and substantially degree of enclosing information can be directly control by integral body control point set, after finishing bulk deformation, change by feature reference mark and deformation constrain point realization chest details parameter, promptly by concrete thin portion size moving characteristic reference mark and change weighted value.The overall process of whole chest deflection is carried out with a kind of principle of avoiding interfering mutually between each size.Illustrated the process of chest deformation shape among Fig. 4.The various real human bodies of the three-dimensional surface scan-data that can come because of women's chest shape of native system also can distortion obtain through the input feature vector variable by certain basic human body, thereby has formed abstract women's chest shape storehouse.
Three, the expansion of two-dimentional cup seam dart in the three-dimensional virtual chest form environment
Three-dimension curved surface is to keep its area unchangeability to the expansion principle of two dimension in the clothes, with this principle, can carry out 3D-2D to human body curved surface each several part and launch, thereby calculate approximate province amount, the empirical value that its precision will be pass by head and shoulders above.
Concrete grammar is, by human body surface is carried out triangulation, and the triangular plate surface structure that obtains being similar to, the precision of subdivision can artificially be controlled, and the triangle space structure can be accurately be deployed on the plane under the constant condition of area keeping.For example, the 3d space of Fig. 3 (a) has a series of triangular plates 123,134,345, suppose at first that 3D triangular plate 123 sign on the plane as figure (b) by its length of side is constant, plane trigonometry sheet 123 and 3d space triangular plate 123 have area identical, be benchmark with 13 limits on the plane then, can correspond to plane triangle 134 to spatial triangle 134 by same principle, the rest may be inferred, can all be deployed into all triangles on the 2D plane.But when launching, choosing of its reference axis is crucial, selects for use different reference axis to launch, and the form of provincial highway and residing position are with different.
For the expansion of brassiere provincial highway, based on the resemblance of chest, the present invention selects unique non-x, y datum axis expansion mode for use, is that launch by fan-shaped mode at the center with the Bp point promptly, has obtained good effect and understanding more intuitively.
Finish above-mentioned brassiere provincial highway and launch on the three-dimensional CAD software platform, its degree of accuracy can artificially be controlled, as long as encrypt the grid of triangulation, can arrive error control within the desired scope.What Fig. 4 described is the program flow diagram that abstract three-dimensional chest shape storehouse and cup seam dart obtain.
The invention provides a kind of method for designing based on personalized brassiere cup seam dart in the three-dimensional virtual chest form environment.At first obtain basic chest shape,, confirm chest shape then according to Fig. 4 program flow diagram based on 3 D human body surface scan data, if dissatisfied, import alternately specific chest characteristic parameter (as chest measurement, under bust girth, the chest dot spacing, breastheight, breastheight is poor, waistline, the waist height, shoulder breadth, shoulder height, chest weight etc.), change basic chest shape and reaffirm new chest shape; If satisfied, in the System menu hurdle, select the centre of expansion function, on the three-dimensional chest, click chest point Bp centre of expansion, system launches the two-dimentional cup figure of corresponding three-dimensional chest automatically, and submits cup seam dart and abundance to.
Table 1 has been enumerated the different human body eigenwert of mutual input, and Fig. 5 is corresponding various chest shape analog results.(a) and (g) be based on the true basic trunk chest shape model that the three-dimensional surface scan-data obtains, (b), (c) and (d) be to have changed the different distortion chest shape that obtains after chest dot spacing and the breastheight difference, (e) and (f) the distortion chest shape for obtaining after input breast different size and the weight, wherein (c), (e) and (f) also be considered as by the simulation chest shape behind the brassiere plastotype.(h) be to be changed and next specific trunk chest model by (g) model, visible whole trunk feature all is variable.
Fig. 6 is the three-dimensional chest and the stretch-out view of corresponding two-dimentional cup and cup that system is submitted to always province's amount and abundance interface figure.(c) the total value of economizing of figure report is 87.873581 degree, and negative value refers to that when triangular plate launches be overlapped in its refining data, and meaning province's amount herein is 0 degree; High-visible from (b) figure, the chest cup is cut into 18 parts of fan sections and launches, every part of fan-shaped 20 degree, with the AC zone is example, the regional for this reason province in BC interval amount, the line of B, C Area Node and chest point Bp is the provincial highway track, clear showing among the figure, cup provincial highway form is made of camber line, and each node province amount shows in (c) figure among the figure.
Table 1 different human body eigenwert (cm)
Through experimental verification, the result that the inventive method obtains measures with actual fit brassiere province and conforms to, and this method also provides cup seam dart distribution refinement scheme first, can be visual by the simulation chest shape behind the brassiere plastotype, design cup seam dart at garment industry fast for the designer, the scientific basis that transforms between three-dimensional and two dimension is provided.
Claims (2)
1. the method for designing of personalized brassiere cup seam dart in the three-dimensional virtual chest form environment, it is characterized in that: concrete steps are:
(1) sets up the basic chest shape model of three-dimensional female body trunk
At first based on 3 D human body surface scan data, on short transverse trunk is divided into several layers, obtains 3 D human body curved surface data battle array, the data on every layer of curve join end to end and guarantee the curve sealing; Adopting the B-spline surface Modeling Technology to carry out trunk then is the modeling of basic chest shape;
(2) make up women's chest shape model bank
The Dirichlet Free Transform technology with weight is composed in utilization, designs multi-level chest model, imports new trunk characteristic parameter alternately: chest measurement, under bust girth, the chest dot spacing, breastheight, breastheight is poor, waistline, the waist height, shoulder breadth, shoulder height, the chest weight is out of shape and is modeled as the natural chest shape of specific human body of expectation or the personalized three-dimensional chest shape behind the simulation brassiere plastotype; Described multi-level chest model is made up of relatively independent submodel, and each interlayer has defined constraint and driving relationship: ground floor is made of whole reference mark, forms convex closure and other equally distributed reference mark in convex closure in the periphery; On short transverse, be divided into a plurality of layers, elevation information of every layer of correspondence; Central axis when having two points to be used for determining distortion; The second layer when the trunk surface is dropped at the reference mark, has determined distortion herein by coming the feature reference mark of controlled deformation to be constituted by changing weights or shift position; The 3rd layer is made of local deformation obligatory point and feature reference mark, and the deformation constrain point is to be arranged in the inner or outside reference mark that influences between restrained deformation or control reference mark of being used for of trunk, and this one deck is the basis of specific implementation size distortion;
(3) expansion of two-dimentional cup seam dart in the three-dimensional virtual chest form environment
According to the area equivalent principle, by the human body surface of triangulation, select for use non-x, y benchmark to launch axis, be that the center is by fan-shaped mode promptly with the Bp point, realize that three-dimensional chest cup to two dimension launches, the cup seam dart of degree of obtaining body design, concrete steps are as follows: confirm chest shape, if dissatisfied, import specific chest characteristic parameter alternately and comprise chest measurement, under bust girth, the chest dot spacing, breastheight, breastheight is poor, waistline, waist height, shoulder breadth, shoulder height, the chest weight changes basic chest shape and reaffirms new chest shape; If satisfied, in the System menu hurdle, select the centre of expansion function, on the three-dimensional chest, click chest point Bp centre of expansion, system launches the two-dimentional cup figure of corresponding three-dimensional chest automatically, and submits cup seam dart and abundance to.
2. the method for designing of personalized brassiere cup seam dart is characterized in that in the three-dimensional virtual chest form environment according to claim 1, and described two-dimentional cup seam dart directly launches to obtain after according to 3 D human body surface scan data modeling.
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| US10492545B2 (en) | 2017-11-16 | 2019-12-03 | Hubbard Innovations, Inc. | Chest wall adapter device |
| WO2021067888A1 (en) * | 2019-10-03 | 2021-04-08 | Cornell University | Optimizing bra sizing according to the 3d shape of breasts |
| US11399578B2 (en) | 2017-11-16 | 2022-08-02 | Hubbard Innovations, Inc. | Chest wall adapter device |
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| CN109463809A (en) * | 2018-11-27 | 2019-03-15 | 浙江理工大学 | A kind of production method of personalized fit brassiere |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10334892B2 (en) | 2017-11-16 | 2019-07-02 | Hubbard Innovations, Inc. | Chest wall adapter device and method of use |
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