CN107085824A - A kind of pole view extracting method of threedimensional model - Google Patents
A kind of pole view extracting method of threedimensional model Download PDFInfo
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- 238000013519 translation Methods 0.000 claims description 6
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Abstract
The present invention provides a kind of pole view extracting method of threedimensional model, first, three-dimensional point cloud model is pre-processed, calculates the barycenter and yardstick of three-dimensional point cloud model, and three-dimensional point cloud model is moved in rectangular coordinate system zoomed in and out, realize that three-dimensional point cloud model fastens normalization in rectangular co-ordinate；Secondly, it will be fastened in rectangular co-ordinate and be transformed into spherical coordinates by the three-dimensional point cloud model of scaling, and obtain direction and the distance property of three-dimensional point cloud model each point；Again, the spherical coordinates of point set is mapped on the location of pixels of pole view, calculates the ultimate range of each pixel sampling distance set, be used as the ray sampled value of Direction interval；Finally, the ultimate range of each pixel sampling distance set is arranged in two-dimentional sample graph for pole view.The problem of causing computationally intensive, view redundancy and many EMS memory occupations present invention, avoiding traditional multi-angle view extracting method；This method, which extracts obtained threedimensional model pole view, can express the global space geometric properties of threedimensional model.
Description
Technical field
The present invention relates to threedimensional model processing technology field, carried more specifically to a kind of pole view of threedimensional model
Take method.
Background technology
With the fast development of computer hardware and software, and threedimensional model modeling technique and the processing of GPU high speed graphics
The development of technology, the quantity sharp increase of threedimensional model promotes the fast development of threedimensional model treatment technology.Threedimensional model conduct
4th kind of multimedia data type, the application field of threedimensional model is also increasingly wider, in Design of Industrial Product, medical biotechnology, mould
Intend being widely used in the fields such as emulation, virtual reality, 3D game, 3D video display and multimedia education system.
The sharp increase of threedimensional model quantity and the application demand of threedimensional model increasingly increase, for the three-dimensional of stereochemical structure
How the expression and feature extraction of model, analyze exactly and scientifically processing threedimensional model becomes urgent problem to be solved.
In recent years, the threedimensional model analysis method based on view has obtained substantial amounts of utilization.By the entity structure of analyzing three-dimensional model,
The two dimension view of threedimensional model is extracted, then two dimension view is analyzed and handled.The extraction of traditional view will generally be carried
The view of multiple angles is taken, needs to spend computing resource and the time of a large amount of computers in extraction process, just can guarantee that multiple
Two dimension view is to the expressed intact of threedimensional model, and multiple views have substantial amounts of information redundancy.Therefore, current view
Extracting method is also far from enough for handling large batch of threedimensional model, so needing at this stage by entering to view extracting method
Row is improved, or combines new theory, studies new threedimensional model view extracting method, for solving current threedimensional model point
Analysis and the problem of feature extraction, have very important significance and are worth.
The content of the invention
It is an object of the invention to overcome shortcoming and deficiency of the prior art to be carried there is provided a kind of pole view of threedimensional model
Take method, the pole view extracting method avoid traditional multi-angle view extracting method cause computationally intensive, view redundancy and
The problem of EMS memory occupation is more；This method, which extracts obtained threedimensional model pole view, can express the global space geometry spy of threedimensional model
Levy, good view feature basis is provided so as to be analyzed for threedimensional model.
In order to achieve the above object, the technical scheme is that：A kind of pole view of threedimensional model
Extracting method, it is characterised in that：
First, three-dimensional point cloud model is pre-processed, calculates the barycenter and yardstick of three-dimensional point cloud model, and by three-dimensional
Point cloud model is moved in rectangular coordinate system and zoomed in and out, and realizes that three-dimensional point cloud model fastens normalization in rectangular co-ordinate；
Secondly, spherical coordinates is transformed into by the three-dimensional point cloud model of scaling by being fastened in rectangular co-ordinate, and obtain three-dimensional point
The direction of each point of cloud model and distance property；
Again, the spherical coordinates of point set is mapped on the location of pixels of pole view, calculates each pixel sampling distance set
Ultimate range, is used as the ray sampled value of Direction interval；
Finally, the ultimate range of each pixel sampling distance set is arranged in two-dimentional sample graph, is that extracted pole is regarded
Figure.
In such scheme, the pole view extracting method of threedimensional model of the present invention avoids traditional multi-angle view and extracted
The problem of method causes computationally intensive, view redundancy and many EMS memory occupations.This method is to be located at the direct origin of coordinates to barycenter
What threedimensional model was extracted, the mapping that direction to the pole view coordinate of a cloud are done on spherical coordinates goes to extract maximum sampled value,
The pole view that this method is extracted can express the global space structure of threedimensional model, so as to provide good for threedimensional model analysis
Good view feature basis.Wherein, pole view refers to outwards launch one group of sampling ray, ray and mould from the barycenter of threedimensional model
The two-dimentional sample graph that the distance of the intersection point of type to barycenter is arranged in.
Specifically, comprise the following steps：
Step S101：Three-dimensional point cloud model is inputted, the yardstick of the three-dimensional point cloud model is P={ pi(xi,yi,zi) | i=1,
2,...,N}；
Step S102：Barycenter g (the g of three-dimensional point cloud model are calculated according to the following equationx, gy, gz), pass through obtained barycenter g
(gx, gy, gz) fasten three-dimensional point cloud model translation transformation to rectangular co-ordinate, then chi of the three-dimensional point cloud model in rectangular coordinate system
Spend for p 'i=pi- g, i=1,2 ..., N；Three-dimensional point cloud model p ' after translation transformationiBarycenter be located at rectangular coordinate system original
Point；
Step s103：The zoom factor s of three-dimensional point cloud model is calculated, three-dimensional point cloud model is zoomed into Unit Scale isOn, wherein, zoom factor s is
Step s104：Spherical coordinates Q is transformed into by the three-dimensional point cloud model of scaling by being fastened in rectangular co-ordinate, it is now three-dimensional
Yardstick of the point cloud model on spherical coordinates beConversion formula is as follows：
Wherein θ ∈ [0, π], it is 0 that the elevation angle is born on semiaxis in Z axis；
Step s105：Spherical coordinates Q is mapped on the location of pixels (u, v) of pole view, mapping relations areThen three-dimensional point cloud model is calculated according to the following equation on the location of pixels (u, v) of pole view；Wherein,
There is spherical coordinates point, multiple spherical coordinates point on one location of pixels (u, v) or in the absence of there is spherical coordinates point；
Wherein nuAnd nvRespectively pole view is wide and long；
Step s106：Each the sampled distance collection of pixel (u, v) isGo out each picture according to the following formula
The maximum of plain sampled distance collection, to obtain pixel sampling value in the view of pole, and is arranged in two-dimentional collection figure and made as ultimate range
For pole view I；
Above-mentioned preprocessing process needs to carry out Pan and Zoom conversion to threedimensional model, it is ensured that threedimensional model is in gauge
Normalization and standardization on degree.Threedimensional model point cloud is converted into spherical coordinate system, two dimension is mapped to beneficial to by spherical coordinates point
The respective pixel position of pole view, by mapping, counts the maximum of the distance set of point on the location of pixels, by maximum sampling
Value forms two-dimentional sample graph, is the new pole view of threedimensional model.
Compared with prior art, the invention has the advantages that and beneficial effect：The pole view of the threedimensional model of the present invention
Extracting method, which avoids traditional multi-angle view extracting method, causes asking more than computationally intensive, view redundancy and EMS memory occupation
Topic；This method, which extracts obtained threedimensional model pole view, can express the global space geometric properties of threedimensional model, so as to be three-dimensional
Model analysis provides good view feature basis.
Brief description of the drawings
Fig. 1 is the flow chart of the pole view extracting method of threedimensional model of the present invention；
Fig. 2 is to be extracted in the pole view extracting method of threedimensional model of the present invention to obtain the signal of pole view by threedimensional model
Figure；
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
Embodiment
As depicted in figs. 1 and 2, the pole view extracting method of threedimensional model of the invention is such：
First, three-dimensional point cloud model is pre-processed, calculates the barycenter and yardstick of three-dimensional point cloud model, and by three-dimensional
Point cloud model is moved in rectangular coordinate system and zoomed in and out, and realizes that three-dimensional point cloud model fastens normalization in rectangular co-ordinate；
Secondly, spherical coordinates is transformed into by the three-dimensional point cloud model of scaling by being fastened in rectangular co-ordinate, and obtain three-dimensional point
The direction of each point of cloud model and distance property；
Again, the spherical coordinates of point set is mapped on the location of pixels of pole view, calculates each pixel sampling distance set
Ultimate range, is used as the ray sampled value of Direction interval；
Finally, the ultimate range of each pixel sampling distance set is arranged in two-dimentional sample graph, is that extracted pole is regarded
Figure.
In such scheme, the pole view extracting method of threedimensional model of the present invention avoids traditional multi-angle view and extracted
The problem of method causes computationally intensive, view redundancy and many EMS memory occupations.This method is to be located at the direct origin of coordinates to barycenter
What threedimensional model was extracted, the mapping that direction to the pole view coordinate of a cloud are done on spherical coordinates goes to extract maximum sampled value,
The pole view that this method is extracted can express the global space structure of threedimensional model, so as to provide good for threedimensional model analysis
Good view feature basis.Wherein, pole view refers to outwards launch one group of sampling ray, ray and mould from the barycenter of threedimensional model
The two-dimentional sample graph that the distance of the intersection point of type to barycenter is arranged in.
Specifically, comprise the following steps：
Step S101：Three-dimensional point cloud model is inputted, the yardstick of the three-dimensional point cloud model is P={ pi(xi,yi,zi) | i=1,
2,...,N}；
Step S102：Barycenter g (the g of three-dimensional point cloud model are calculated according to the following equationx, gy, gz), pass through obtained barycenter g
(gx, gy, gz) fasten three-dimensional point cloud model translation transformation to rectangular co-ordinate, then chi of the three-dimensional point cloud model in rectangular coordinate system
Spend for p 'i=pi- g, i=1,2 ..., N；Three-dimensional point cloud model p ' after translation transformationiBarycenter be located at rectangular coordinate system original
Point；
Step s103：The zoom factor s of three-dimensional point cloud model is calculated, three-dimensional point cloud model is zoomed into Unit Scale isOn, wherein, zoom factor s is
Step s104：Spherical coordinates Q is transformed into by the three-dimensional point cloud model of scaling by being fastened in rectangular co-ordinate, it is now three-dimensional
Yardstick of the point cloud model on spherical coordinates beConversion formula is as follows：
Wherein θ ∈ [0, π], it is 0 that the elevation angle is born on semiaxis in Z axis；
Step s105：Spherical coordinates Q is mapped on the location of pixels (u, v) of pole view, mapping relations areThen three-dimensional point cloud model is calculated according to the following equation on the location of pixels (u, v) of pole view；Wherein,
There is spherical coordinates point, multiple spherical coordinates point on one location of pixels (u, v) or in the absence of there is spherical coordinates point；
Wherein nuAnd nvRespectively pole view is wide and long；
Step s106：Each the sampled distance collection of pixel (u, v) isGo out each picture according to the following formula
The maximum of plain sampled distance collection, to obtain pixel sampling value in the view of pole, and is arranged in two-dimentional collection figure and made as ultimate range
For pole view I；
Above-mentioned preprocessing process needs to carry out Pan and Zoom conversion to threedimensional model, it is ensured that threedimensional model is in gauge
Normalization and standardization on degree.Threedimensional model point cloud is converted into spherical coordinate system, two dimension is mapped to beneficial to by spherical coordinates point
The respective pixel position of pole view, by mapping, counts the maximum of the distance set of point on the location of pixels, by maximum sampling
Value forms two-dimentional sample graph, is the new pole view of threedimensional model.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (2)
1. a kind of pole view extracting method of threedimensional model, it is characterised in that：
First, three-dimensional point cloud model is pre-processed, calculates the barycenter and yardstick of three-dimensional point cloud model, and by three-dimensional point cloud
Model is moved in rectangular coordinate system and zoomed in and out, and realizes that three-dimensional point cloud model fastens normalization in rectangular co-ordinate；
Secondly, spherical coordinates is transformed into by the three-dimensional point cloud model of scaling by being fastened in rectangular co-ordinate, and obtain three-dimensional point cloud mould
The direction of each point of type and distance property；
Again, the spherical coordinates of point set is mapped on the location of pixels of pole view, calculates the maximum of each pixel sampling distance set
Distance, is used as the ray sampled value of Direction interval；
Finally, the ultimate range of each pixel sampling distance set is arranged in two-dimentional sample graph, is extracted pole view.
2. the pole view extracting method of threedimensional model according to claim 1, it is characterised in that：Comprise the following steps：
Step S101：Three-dimensional point cloud model is inputted, the yardstick of the three-dimensional point cloud model is P={ pi(xi,yi,zi) | i=1,
2,...,N}；
Step S102：Barycenter g (the g of three-dimensional point cloud model are calculated according to the following equationx, gy, gz), pass through obtained barycenter g (gx,
gy, gz) fasten three-dimensional point cloud model translation transformation to rectangular co-ordinate, then three-dimensional point cloud model is in the yardstick of rectangular coordinate system
p′i=pi- g, i=1,2 ..., N；Three-dimensional point cloud model p after translation transformationi' barycenter be located at rectangular coordinate system origin；
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Step s103：The zoom factor s of three-dimensional point cloud model is calculated, three-dimensional point cloud model is zoomed into Unit Scale is
On, wherein, zoom factor s is
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</mrow>
Step s104：Spherical coordinates Q is transformed into by the three-dimensional point cloud model of scaling by being fastened in rectangular co-ordinate, now three-dimensional point cloud
Yardstick of the model on spherical coordinates beConversion formula is as follows：
Wherein θ ∈ [0, π], it is 0 that the elevation angle is born on semiaxis in Z axis；
Step s105：Spherical coordinates Q is mapped on the location of pixels (u, v) of pole view, mapping relations are
Then three-dimensional point cloud model is calculated according to the following equation on the location of pixels (u, v) of pole view；Wherein, location of pixels (u,
V) there is spherical coordinates point, multiple spherical coordinates point on or in the absence of there is spherical coordinates point；
Wherein nuAnd nvRespectively pole view is wide and long；
Step s106：Each the sampled distance collection of pixel (u, v) isGo out each pixel sampling according to the following formula
The maximum of distance set is as ultimate range to obtain pixel sampling value in the view of pole, and be arranged in two-dimentional collection figure to regard as pole
Scheme I；
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Cited By (2)
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| CN108230242A (en) * | 2018-01-10 | 2018-06-29 | 大连理工大学 | A kind of conversion method from panorama laser point cloud to video flowing |
| WO2019042028A1 (en) * | 2017-09-01 | 2019-03-07 | 叠境数字科技（上海）有限公司 | All-around spherical light field rendering method |
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| CN102411794A (en) * | 2011-07-29 | 2012-04-11 | 南京大学 | Output method of two-dimensional (2D) projection of three-dimensional (3D) model based on spherical harmonic transform |
| CN105243637A (en) * | 2015-09-21 | 2016-01-13 | 武汉海达数云技术有限公司 | Panorama image stitching method based on three-dimensional laser point cloud |
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Cited By (5)
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| WO2019042028A1 (en) * | 2017-09-01 | 2019-03-07 | 叠境数字科技（上海）有限公司 | All-around spherical light field rendering method |
| GB2584753A (en) * | 2017-09-01 | 2020-12-16 | Plex Vr Digital Tech Shanghai Co Ltd | All-around spherical light field rendering method |
| US10909752B2 (en) | 2017-09-01 | 2021-02-02 | Plex-Vr Digital Technology (Shanghai) Co., Ltd. | All-around spherical light field rendering method |
| GB2584753B (en) * | 2017-09-01 | 2021-05-26 | Plex Vr Digital Tech Shanghai Co Ltd | All-around spherical light field rendering method |
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