CN104376187A - Intermediate virtual mannequin construction method based on reverse engineering technology - Google Patents

Intermediate virtual mannequin construction method based on reverse engineering technology Download PDF

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CN104376187A
CN104376187A CN201410738315.6A CN201410738315A CN104376187A CN 104376187 A CN104376187 A CN 104376187A CN 201410738315 A CN201410738315 A CN 201410738315A CN 104376187 A CN104376187 A CN 104376187A
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human body
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point
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reverse engineering
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CN104376187B (en
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方方
王子英
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Donghua University
National Dong Hwa University
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Abstract

The invention relates to an intermediate virtual mannequin construction method based on a reverse engineering technology. The intermediate virtual mannequin construction method includes: selecting a three-dimensional human body model from a certain sample size of human bodies in a specific age group, measuring sizes of all parts of the three-dimensional human body model, and screening proper models based on data of the sizes; cutting the three-dimensional human body model into multiple horizontal sections, dividing the each horizontal section by taking the center of the horizontal section as an origin anticlockwise at equal angles, and dividing section contour curves into uniform point clouds; layering each model to obtain feature points, and converting the feature points into three-dimensional space coordinates; equalizing the coordinates of the same feature points of the same parts, enabling the coordinates to be symmetrical relative to a human body symmetry axis, and generating an intermediate three-dimensional human body point cloud matrix for the age group; importing the point cloud matrix into reverse engineering software to generate a three-dimensional network model, and obtaining an NURBS (non-uniform rational b-splines) curved surface by fitting. The intermediate virtual mannequin construction method based on the reverse engineering technology has the advantage that modeling time is shortened during virtual mannequin construction by the aid of the reverse engineering technology.

Description

A kind of construction method of the intermediate dummy body form based on reverse Engineering Technology
Technical field
The present invention relates to human engineering of clothing to learn a skill field, particularly relate to a kind of construction method of the intermediate dummy body form based on reverse Engineering Technology.
Background technology
The development of internet changes life style and the consumption pattern of people, based on MTM garment virtual fitting be applied to more and more clothes customized in.Along with clothes digital development, on the one hand because the size difference of the reason person to persons such as age differences, individual difference, areal variation, racial difference is larger, garment production makes buman body type classificating requirement more and more thinner on the one hand, and the requirement of people to clothes zoarium degree and comfort level is more and more higher.Clothes are customized or become the important trend of 21 century, and dummy body form is conducive to helping people by the dummy body form fit degree of long-range experience clothes and aesthetic property on the internet.Existing dummy body form construction method has:
Publication number is the 3 D human body data above the waist that the method for building up (2010) of the industrial people's platform of clothes three-dimensional cutting with quantity of margin of CN101912169A adopts certain age bracket, the intermediate data obtained with statistical study are foundation, 3 D human body adds quantity of margin when wearing clothes, sets up the clothes clothes form above the waist with quantity of margin.This invention can meet the demand of designer for coat garment moulding.Entity people platform is bonded by after ABS material 3 D-printing.
Publication number is that Divisional combined three-dimensional parameters number people's platform construction method (2007) of CN101013508A selects the main parts describing human body curved surface features according to anthropometric data, classify by the curvilinear characteristic of each main parts, different classes of main parts independent assortment is formed whole man's platform.People's platform is described by the multiple key points on feature degree of the enclosing cross section of partes corporis humani position, and each key point is obtained by regression equation, is reached through parameter and regulates the build at each position and the object of size.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of construction method of the intermediate dummy body form based on reverse Engineering Technology, can set up the human body intermediate dummy body form meeting a certain age bracket build.
The technical solution adopted for the present invention to solve the technical problems is: the construction method providing a kind of intermediate dummy body form based on reverse Engineering Technology, comprises the following steps:
(1) select the three-dimensional (3 D) manikin of certain age bracket human body of certain sample size, measure each spot size of three-dimensional (3 D) manikin, screen the basis of suitable model as modeling as data basis;
(2) according to some cloud density degree during body scans, manikin is cut into multiple horizontal section, and with the center of horizontal section for initial point angularly splits cross section counterclockwise, sectional profile curve lin is divided into and puts cloud uniformly, complete the decomposition to manikin;
(3) layering is carried out to each model and get unique point, unique point is converted into three dimensional space coordinate;
(4) to the coordinate equalization of the same unique point in same position, and symmetrical about human body axis of symmetry, generate this age bracket intermediate 3 D human body point cloud matrix;
(5) will put cloud matrix and import reverse engineering software, generate three-dimensional grid model, finally fit to nurbs surface, closed nurbs surface is an entity, thus completes intermediate three-dimensional (3 D) manikin.
Manikin is cut into 90 horizontal sections in described step (2).
Build the model of intermediate in described step (4) according to the form of m * n matrix, the three-dimensional feature value of each unique point on every one deck of each three-dimensional model is averaged, build intermediate model point cloud matrix, obtain wherein, represent jth name model n-th layer K point, I jn(Δ x jn, Δ y jn, 0) and represent the center offset of jth name model n-th layer.
In described step (4), human body axis of symmetry symmetrical treatment comprises the some cloud symmetrical treatment of trunk and lower limb.
The point cloud symmetrical treatment of described lower limb only need extract the three dimensional point cloud of human body right lower extremity, human body central shaft place plane is as ymmetry center plane, human body left lower extremity and right lower extremity are symmetrical about Y-axis, the X-coordinate opposite number each other of arbitrary data point and its right lower extremity character pair point on left lower extremity; Wherein, X-axis is the transverse axis of ymmetry center plane, and Y-axis is the longitudinal axis of ymmetry center plane.
Beneficial effect
Owing to have employed above-mentioned technical scheme, the present invention compared with prior art, has following advantage and good effect:
The principle of body-face-line-point-line-face-body in reverse-engineering is applied in fashion talent by modeling method of the present invention, realize some cloud-three-dimensional grid model-this process of nurbs surface-solid model after the some cloud a real human body-human body solid model-people's body section-cross section curve-curve-cloud coordinate process-rearrange, utilize reverse Engineering Technology dummy body form to set up the time shortening model foundation, have important practical significance and economic worth.
The present invention realizes the structure of intermediate three-dimensional virtual human platform, can be widely used in Clothes dress model design and fabrication, the Application and Development of three-dimensional garment CAD software, the fields such as the virtual fitting in custom made clothing and human engineering.
Accompanying drawing explanation
Fig. 1 is that human body lower body of the present invention is divided into 51 layers of schematic diagram;
Fig. 2 is point coordinate diagram such as each layer cross section isogonism of the present invention;
Fig. 3 is the cross section before symmetrization process of the present invention;
Fig. 4 is the cross section after symmetrization process of the present invention.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiments of the present invention relate to a kind of construction method of the intermediate dummy body form based on reverse Engineering Technology, comprise the following steps: the three-dimensional (3 D) manikin selecting certain age bracket human body of certain sample size, measure each spot size of three-dimensional (3 D) manikin, screen the basis of suitable model as modeling as data basis; According to some cloud density degree during body scans, manikin is cut into multiple horizontal section, and with the center of horizontal section for initial point angularly splits cross section counterclockwise, sectional profile curve lin is divided into and puts cloud uniformly, complete the decomposition to manikin; Layering is carried out to each model and gets unique point, unique point is converted into three dimensional space coordinate; To the coordinate equalization of the same unique point in same position, and symmetrical about human body axis of symmetry, generate this age bracket intermediate 3 D human body point cloud matrix; To put cloud matrix and import reverse engineering software, generate three-dimensional grid model, finally fit to nurbs surface, closed nurbs surface is an entity, thus completes intermediate three-dimensional (3 D) manikin.
The present invention is further illustrated below with a specific embodiment.
Step 1, select 200 18-25 year young women three-dimensional (3 D) manikin, denoising, filling-up hole and fairing processing are carried out to model, and extract the human body parts needed, measure the size at each position, obtain the data characteristics at this each position of age bracket intermediate as data basis.
Step 2, screen the model of 15 every body indexs close to intermediate data, according to some cloud density degree during body scans, manikin is cut into multiple horizontal section, trunk is slightly larger than the some cloud density of lower limb as shown in Figure 1, part point cloud close to anklebone is the most intensive, in order at utmost close to manikin point cloud density actual conditions, human body is divided 90 layers.
Step 3, with the center of horizontal section for initial point angularly splits cross section counterclockwise, sectional profile curve lin is divided into and puts cloud uniformly, complete the decomposition to manikin.As shown in Figure 2, be No. 1 point with the intersection point of cross section curve with horizontal X axle positive dirction, numbered counter-clockwise, final No. 61 points overlap with No. 1 point.
Step 4,61 of each layer cross section unique points are converted into three dimensional space coordinate.Each model has a corresponding 3 D human body point cloud matrix, sees formula (1).Wherein n is the number of plies at point coordinate place, and K is counting of the coordinate of every layer, and the z coordinate of every layer is all identical, in formula represent K point coordinate of n-th layer.
I 1 1 ( x 1 , y 1 , z 1 ) . . . I 1 K ( x k , y k , z 1 ) . . . I 1 61 ( x 61 , y 61 , z 1 ) I 2 1 ( x 1 , y 1 , z 2 ) . . . I 2 K ( x k , y k , z 2 ) . . . I 2 61 ( x 61 , y 61 , z 2 ) I n 1 ( x 1 , y 1 , z n ) . . . I n K ( x k , y k , z n ) . . . I n 61 ( x 61 , y 61 , z n ) - - - ( 1 )
Step 5, due to the reason such as stance or instrumental systematic errors, the central point of each layer cross section of trunk may have the skew of smile.Z-direction, owing to being short transverse, does not have deviation.Set up the error of intermediate model to reduce the later stage, need center to be adjusted to 0 new point, the coordinates matrix after adjustment is shown in formula (2), wherein Δ I n(Δ x n, Δ y n, 0) and represent the side-play amount that the center of n-th layer needs.
I ′ = I 1 1 ( x 1 , y 1 , z 1 ) + ΔI 1 ( Δx 1 , Δy 1 , 0 ) . . . I 1 K ( x k , y k , z 1 ) + ΔI 1 . . . I 1 61 ( x 61 , y 61 , z 1 ) + ΔI 1 I 2 1 ( x 1 , y 1 , z 2 ) + ΔI 2 ( Δx 2 , Δy 2 , 0 ) . . . I 2 K ( x k , y k , z 2 ) + ΔI 2 . . . I 2 61 ( x 61 , y 61 , z 2 ) + ΔI 2 I n 1 ( x 1 , y 1 , z n ) + ΔI n ( Δx n , Δy n , 0 ) . . . I n K ( x k , y k , z n ) + ΔI n . . . I n 61 ( x 61 , y 61 , z n ) + ΔI n - - - ( 2 )
Step 6, coordinate equalization to the same unique point in same position, and symmetrical about human body axis of symmetry, generate this age bracket intermediate point cloud matrix.Build the model of intermediate according to the form of m * n matrix, the three-dimensional feature value of each unique point on every one deck of each three-dimensional model after adjustment coordinate is averaged, rebuilds intermediate model point cloud matrix, shown in (3).Wherein represent the j model's n-th layer K point, I jn(Δ x jn, Δ y jn, 0) and represent the center offset of jth name model n-th layer.
Step 7, regarded as to hit exactly the symmetrical body that sagittal plane is axis of symmetry by human body, with the right side of human body for benchmark, symmetrization process mainly comprises the some cloud symmetrical treatment of trunk and lower limb, and implementation step is as follows:
Step 7.1, trunk cross section symmetrical treatment.
After trunk cross section is symmetrical about Y-axis, the 1st point and the 31st point are positioned in X-axis, and symmetrical about Y-axis; 16th point and the 46th point are positioned in Y-axis, and are the front-rear center point of human body xsect.
There is x 31=-x 1, y 31=y 1; 16th point and the 46th point are positioned in Y-axis, and are the front-rear center point of human body xsect; 2nd point is with symmetrical about Y-axis with 30 points, and the 32nd point and the 60th point are about Y-axis symmetry.Have the like, for 1st ~ 31 points, n-th is symmetrical about Y-axis with 32-n point, has x n=-x 32-n, y n=y 32-n; For the 32nd to the 60th point, put for n-th and 92-n and have x about Y-axis symmetry n=-x 92-n, y n=y 92-n; The computing formula of human body symmetrization process is as follows:
x n ′ = | x n | , 1 ≤ n ≤ 16 x n ′ = - | x 32 - n | , 17 ≤ n ≤ 31 x n ′ = - | x 92 - n | , 32 ≤ n ≤ 46 x n ′ = | x n | , 47 ≤ n ≤ 61
y n ′ = y 32 - n , 1 ≤ n ≤ 15 y 16 ′ = 0 y n ′ = y 32 - n , 17 ≤ n ≤ 30 y n ′ = y 92 - n , 31 ≤ n ≤ 46 y 46 ′ = 0 y n ′ = y 92 - n , 47 ≤ n ≤ 61
Step 7.2, lower limb symmetrical treatment
Lower limb symmetrical treatment only need extract the three dimensional point cloud of human body right lower extremity, human body central shaft place plane is as ymmetry center plane, human body left lower extremity and right lower extremity are about Y-axis symmetry, the X-coordinate opposite number each other of arbitrary data point and its right lower extremity character pair point on left lower extremity, Y, Z coordinate is constant. and point coordinate formula is as follows: x l=-x r, y l=y r, z l=z r.Fig. 3 and Fig. 4 is before symmetrical treatment and the contrast of symmetrical treatment descendant body section.
Step 8, finally import in reverse engineering software by the intermediate three-dimensional point cloud handled well, build three-dimensional grid model and finally fit to nurbs surface, closed nurbs surface is an entity, thus completes intermediate three-dimensional (3 D) manikin.

Claims (5)

1., based on a construction method for the intermediate dummy body form of reverse Engineering Technology, it is characterized in that, comprise the following steps:
(1) select the three-dimensional (3 D) manikin of certain age bracket human body of certain sample size, measure each spot size of three-dimensional (3 D) manikin, screen the basis of suitable model as modeling as data basis;
(2) according to some cloud density degree during body scans, manikin is cut into multiple horizontal section, and with the center of horizontal section for initial point angularly splits cross section counterclockwise, sectional profile curve lin is divided into and puts cloud uniformly, complete the decomposition to manikin;
(3) layering is carried out to each model and get unique point, unique point is converted into three dimensional space coordinate;
(4) to the coordinate equalization of the same unique point in same position, and symmetrical about human body axis of symmetry, generate this age bracket intermediate 3 D human body point cloud matrix;
(5) will put cloud matrix and import reverse engineering software, generate three-dimensional grid model, finally fit to nurbs surface, closed nurbs surface is an entity, thus completes intermediate three-dimensional (3 D) manikin.
2. the construction method of the intermediate dummy body form based on reverse Engineering Technology according to claim 1, is characterized in that, manikin is cut into 90 horizontal sections in described step (2).
3. the construction method of the intermediate dummy body form based on reverse Engineering Technology according to claim 1, it is characterized in that, build the model of intermediate according to the form of m * n matrix in described step (4), the three-dimensional feature value of each unique point on every one deck of each three-dimensional model is averaged, build intermediate model point cloud matrix, obtain
wherein, represent jth name model n-th layer K point, I jn(Δ x jn, Δ y jn, 0) and represent the center offset of jth name model n-th layer.
4. the construction method of the intermediate dummy body form based on reverse Engineering Technology according to claim 1, is characterized in that, in described step (4), human body axis of symmetry symmetrical treatment comprises the some cloud symmetrical treatment of trunk and lower limb.
5. the construction method of the intermediate dummy body form based on reverse Engineering Technology according to claim 4, it is characterized in that, the point cloud symmetrical treatment of described lower limb only need extract the three dimensional point cloud of human body right lower extremity, human body central shaft place plane is as ymmetry center plane, human body left lower extremity and right lower extremity are symmetrical about Y-axis, the X-coordinate opposite number each other of arbitrary data point and its right lower extremity character pair point on left lower extremity; Wherein, X-axis is the transverse axis of ymmetry center plane, and Y-axis is the longitudinal axis of ymmetry center plane.
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