CN116503564A - Method and system for acquiring three-dimensional model of building - Google Patents
Method and system for acquiring three-dimensional model of building Download PDFInfo
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Abstract
The invention discloses a method and a system for acquiring a three-dimensional model of a building, which belong to the technical field of building model acquisition, wherein the method for acquiring the three-dimensional model of the building comprises the following specific steps: step one: building data are collected: shooting an appearance diagram of a building through shooting equipment to form two-dimensional picture data, simultaneously acquiring the geographic position of any point on the building, and splicing and combining the two-dimensional picture data into a floor plan according to house renting websites or house type plan issued by property; step two: building a three-dimensional top surface of a building: according to the geographic position in the first step, the plane top surface characteristic point group and the cambered surface top surface characteristic point group are selected, so that the characteristic points can be selected more simply and conveniently, the construction process of the three-dimensional top surface of the building is simplified, the construction calculation amount of the white mould of the building is reduced, the construction cost is reduced, the construction efficiency is improved, and the three-dimensional model of the building has an internal structure, so that the three-dimensional model is enriched.
Description
Technical Field
The invention relates to the technical field of building model acquisition, in particular to a method and a system for acquiring a three-dimensional model of a building.
Background
The digital city, also called digital city or intelligent city, refers to comprehensive digital acquisition and processing of the infrastructure and functional mechanism of the city by comprehensively utilizing computer digital means, has powerful functions of digitalization, networking and decision optimization of complex systems such as urban geography, resources, ecological environment, population, economy, society and the like, and is a technical system for previewing the effect of important decisions and predicting future development. City modeling is an important content and necessary step of digital city, and city model construction is based on building three-dimensional model construction, therefore, in the prior art, a three-dimensional model acquisition technology of a building is proposed, the three-dimensional model acquisition of the building generally comprises two parts of building white mold construction and texture acquisition, the three-dimensional model of the building is obtained by mapping the texture of the building on the building white mold, wherein the three-dimensional model used for mapping is called white mold, the existing three-dimensional model acquisition method of the building is purely manual, and after the building white mold is built, the texture of the building is pasted on the surface of the white mold by the manual method, so that the three-dimensional model of the building is obtained.
Through searching, chinese patent No. CN103886640B discloses a method and a system for obtaining a three-dimensional model of a building, which can obtain a three-dimensional model of a building with the side texture and the top texture, so as to simplify the mapping process, improve the automation degree, and shorten the modeling period.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method and a system for acquiring a three-dimensional model of a building.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the method for acquiring the three-dimensional model of the building comprises the following specific steps of:
step one: building data are collected: shooting an appearance diagram of a building through shooting equipment to form two-dimensional picture data, simultaneously acquiring the geographic position of any point on the building, and splicing and combining the two-dimensional picture data into a floor plan according to house renting websites or house type plan issued by property;
step two: building a three-dimensional top surface of a building: selecting a plane top surface characteristic point group and an arc surface top surface characteristic point group according to the geographic position in the first step, constructing a plane top surface and an arc surface top surface according to the plane top surface characteristic point group and the arc surface top surface characteristic point group, and smoothing the plane top surface and the arc surface top surface through a smoothing algorithm to form a three-dimensional top surface of the building;
step three: building a building white mold: selecting an extreme value of an X-axis value and an extreme value of a Y-axis value in a plane top surface characteristic point group, extracting the characteristic points to form a perimeter characteristic point, so that the circumference of the building top surface can be formed, selecting characteristic points corresponding to the plane top surface characteristic points to form a termination characteristic point group, selecting the extreme value of the X-axis value and the extreme value of the Y-axis value under the condition that the Z-axis values are the same, extracting the characteristic points to form the perimeter characteristic points, so that a termination circumference is constructed, starting with the circumference of the building top surface, ending with the termination circumference, downwards generating a building side surface, finally forming a building white mold pre-mold according to the three-dimensional top surface of the building, enabling a vertical wall top view in a floor plan to correspond to the plane top surface characteristic point group, forming a floor vertical wall characteristic point group, further forming the circumference of the floor vertical wall, ending with the plane where the termination circumference is located, repeatedly generating an inner surface of the building, and obtaining a building white mold;
step four: building a three-dimensional building model: and extracting the side texture and the top texture of the building in the two-dimensional picture data, and mapping the side texture and the top texture of the building on the building white mold to obtain the three-dimensional building model.
Further, the specific process of selecting the plane top surface characteristic point group and the cambered surface top surface characteristic point group in the second step is as follows: under the condition that the X-axis value and the Y-axis value are the same, extracting the maximum value and the minimum value of the Z-axis, combining the X-axis value and the Y-axis value to form a pair of characteristic points, establishing a mapping relation, repeating the operation to form a first group of characteristic points, selecting the characteristic points with the same Z-axis value from the first group of characteristic points, forming a plane top characteristic point group if the number of the characteristic points is more than 1, and selecting the characteristic point closest to the X-axis value, the Y-axis value and the Z-axis value of the characteristic points to form a cambered surface top characteristic point group if the number of the characteristic points is less than 1.
The system for acquiring the three-dimensional model of the building comprises a data acquisition end and a model construction end; the data acquisition end comprises a camera module, a coordinate acquisition module, a characteristic point selection module, a house type acquisition module and a sending module; the model building end comprises a white model generation module, a texture extraction module and a three-dimensional model generation module;
the camera module is used for shooting an appearance image of a building to form two-dimensional image data; the coordinate acquisition module is used for acquiring the geographic position of any point on the building and sending the geographic position to the characteristic point selection module; wherein, the specific operation of obtaining the geographic position of any point on the building is as follows:
s1, obtaining geographic coordinates of shooting equipment to form origin coordinates;
s2, establishing a space coordinate system with an origin coordinate as an initial point according to a shooting range of shooting equipment, selecting a geographic coordinate point in the space coordinate system as a control point, enabling the control point to correspond to a pixel point in an imaging matrix of the shooting equipment, guiding the control point and the pixel point into a geographic coordinate conversion unit, and further obtaining geographic coordinates of other pixel points in the imaging matrix according to projection transformation and coordinate conversion;
s3, deriving the geographic coordinates of each point of the building according to the pixel point of the building, and obtaining the geographic position of any point on the building;
the characteristic point selection module is used for selecting characteristic points, and comprises the following specific operation steps:
SS1, under the condition that X-axis and Y-axis values are the same, extracting a maximum value and a minimum value of a Z-axis, combining the X-axis and Y-axis values to form a pair of characteristic points, establishing a mapping relation, repeating the operations, and forming a first group of characteristic points;
and SS2, selecting characteristic points with the same Z-axis value from the first group of characteristic points, forming a plane top surface characteristic point group if the number of the characteristic points is more than 1, and selecting the characteristic point closest to the X-axis, Y-axis and Z-axis values of the characteristic points to form a cambered surface top surface characteristic point group if the number of the characteristic points is=1.
Further, the house type acquisition module is spliced and combined into a floor plan according to house type plan issued by a house renting website or a property; the transmitting module transmits the plane top surface characteristic point group, the cambered surface top surface characteristic point group and the floor plan to the white mold generating module, and transmits the two-dimensional picture data to the texture extracting module.
Further, the white mold generating module is used for generating a building white mold, specifically:
i, constructing a plane top surface and a cambered surface top surface according to the plane top surface characteristic point group and the cambered surface top surface characteristic point group, and smoothing the plane top surface and the cambered surface top surface through a smoothing algorithm to form a three-dimensional top surface of the building;
II, selecting an extreme value of an X-axis value and an extreme value of a Y-axis value in the plane top surface characteristic point group, extracting the characteristic points to form a perimeter characteristic point, so that the perimeter of the top surface of the building can be formed, selecting the characteristic point corresponding to the plane top surface characteristic point according to the mapping relation in the step SS1 to form a termination characteristic point group, selecting the extreme value of the X-axis value and the extreme value of the Y-axis value under the condition that the Z-axis values are the same, extracting the characteristic points to form the perimeter characteristic point, and thus constructing the termination perimeter;
III, taking the perimeter of the top surface of the building as the beginning and the ending perimeter as the ending, generating a side surface of the building downwards, and finally forming a white building pre-mold according to the three-dimensional top surface of the building;
and IV, corresponding the vertical wall top view in the floor plan to the plane top surface characteristic point group, so as to form a floor vertical wall characteristic point group, further forming the perimeter of the floor vertical wall, and repeating the step III to generate the inner surface of the building by taking the plane where the termination perimeter is located as the end, thus obtaining the building white mould.
Further, the texture extraction module is used for extracting side textures and top textures of the building in the two-dimensional picture data; and the three-dimensional model generating module maps the side texture and the top texture of the building to the building white model to obtain the three-dimensional model of the building.
Further, the basic method of projective transformation and coordinate transformation in step S2 employs a numerical analysis transformation method.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the geographic position of any point on the building is obtained, and the plane top surface characteristic point group and the cambered surface top surface characteristic point group are selected according to the geographic position, so that the characteristic points are easy and convenient to select, the construction process of the three-dimensional top surface of the building is simplified, the construction calculation amount of the building white mould is reduced, the construction cost is reduced, and the construction efficiency is improved.
2. According to the invention, the vertical wall top view in the floor plan corresponds to the plane top surface characteristic point group, so that the floor vertical wall characteristic point group is formed, the floor vertical wall perimeter is further formed, the plane where the termination perimeter is located is used as the end, the inner surface of the building is repeatedly generated, and the building white mold is obtained, so that the three-dimensional model of the building has an inner structure, and the three-dimensional model is enriched.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
Fig. 1 is a schematic diagram of an acquisition flow of a method for acquiring a three-dimensional model of a building according to the present invention;
fig. 2 is a schematic block flow diagram of a system for acquiring a three-dimensional model of a building according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1:
referring to fig. 1, the present invention provides a technical solution: the method for acquiring the three-dimensional model of the building comprises the following specific steps of:
step one: building data are collected: shooting an appearance diagram of a building through shooting equipment to form two-dimensional picture data, simultaneously acquiring the geographic position of any point on the building, and splicing and combining the two-dimensional picture data into a floor plan according to house renting websites or house type plan issued by property;
step two: building a three-dimensional top surface of a building: selecting a plane top surface characteristic point group and an arc surface top surface characteristic point group according to the geographic position in the first step, constructing a plane top surface and an arc surface top surface according to the plane top surface characteristic point group and the arc surface top surface characteristic point group, and smoothing the plane top surface and the arc surface top surface through a smoothing algorithm to form a three-dimensional top surface of the building; the specific process for selecting the plane top surface characteristic point group and the cambered surface top surface characteristic point group comprises the following steps: under the condition that the X-axis value and the Y-axis value are the same, extracting the maximum value and the minimum value of the Z-axis, combining the X-axis value and the Y-axis value to form a pair of characteristic points, establishing a mapping relation, repeating the operation to form a first group of characteristic points, selecting the characteristic points with the same Z-axis value from the first group of characteristic points, forming a plane top characteristic point group if the number of the characteristic points is more than 1, and selecting the characteristic point closest to the X-axis value, the Y-axis value and the Z-axis value of the characteristic points to form a cambered surface top characteristic point group if the number of the characteristic points is less than 1;
step three: building a building white mold: selecting an extreme value of an X-axis value and an extreme value of a Y-axis value in a plane top surface characteristic point group, extracting the characteristic points to form a perimeter characteristic point, so that the circumference of the building top surface can be formed, selecting characteristic points corresponding to the plane top surface characteristic points to form a termination characteristic point group, selecting the extreme value of the X-axis value and the extreme value of the Y-axis value under the condition that the Z-axis values are the same, extracting the characteristic points to form the perimeter characteristic points, so that a termination circumference is constructed, starting with the circumference of the building top surface, ending with the termination circumference, downwards generating a building side surface, finally forming a building white mold pre-mold according to the three-dimensional top surface of the building, enabling a vertical wall top view in a floor plan to correspond to the plane top surface characteristic point group, forming a floor vertical wall characteristic point group, further forming the circumference of the floor vertical wall, ending with the plane where the termination circumference is located, repeatedly generating an inner surface of the building, and obtaining a building white mold;
step four: building a three-dimensional building model: and extracting the side texture and the top texture of the building in the two-dimensional picture data, and mapping the side texture and the top texture of the building on a building white mold to obtain the three-dimensional building model.
Specifically, in the process of building a white mold pre-mold of a building, a two-dimensional picture data is formed by shooting a building appearance picture through shooting equipment, the geographic position of any point on the building is obtained, the floor plan is formed by splicing and combining the floor plan according to house renting websites or house type plan issued by the building industry, the plane top characteristic point group and the cambered surface top characteristic point group are selected according to the geographic position, the plane top surface and the cambered surface top surface are built according to the plane top characteristic point group and the cambered surface top surface characteristic point group, smoothing processing is carried out on the plane top surface and the cambered surface top surface through a smoothing algorithm to form a three-dimensional top surface of the building, the extreme value of an X-axis value and the extreme value of a Y-axis value in the plane top surface characteristic point group are selected, the characteristic point is extracted, the perimeter of the building top surface can be formed, the characteristic point corresponding to the characteristic point of the plane top surface is selected, the extreme value of the X-axis value and the extreme value of the Y-axis value are selected under the condition that the Z-axis value is the same, the characteristic point is formed, the perimeter of the periphery of the building is formed, the building top surface is used as the initial perimeter of the building top surface, the building is not ended, the three-dimensional perimeter is reduced, the building perimeter is not formed, and the building perimeter is not is simply constructed, and the building perimeter is reduced, and the building perimeter is not is simply is formed, and the building is simply is constructed.
Example 2:
referring to fig. 2, the present invention provides a technical solution: the system for acquiring the three-dimensional model of the building comprises a data acquisition end and a model construction end; the data acquisition end comprises a camera module, a coordinate acquisition module, a characteristic point selection module, a house type acquisition module and a sending module; the model building end comprises a white model generating module, a texture extracting module and a three-dimensional model generating module;
the camera module is used for shooting an appearance image of a building to form two-dimensional image data; the coordinate acquisition module is used for acquiring the geographic position of any point on the building and sending the geographic position to the characteristic point selection module; wherein, the specific operation of obtaining the geographic position of any point on the building is as follows:
s1, obtaining geographic coordinates of shooting equipment to form origin coordinates;
s2, establishing a space coordinate system with an origin coordinate as an initial point according to a shooting range of shooting equipment, selecting a geographic coordinate point in the space coordinate system as a control point, enabling the control point to correspond to a pixel point in an imaging matrix of the shooting equipment, guiding the control point and the pixel point into a geographic coordinate conversion unit, and further obtaining geographic coordinates of other pixel points in the imaging matrix according to projection transformation and coordinate conversion; the basic method of projection transformation and coordinate transformation adopts a numerical analysis transformation method;
s3, deriving the geographic coordinates of each point of the building according to the pixel point of the building, and obtaining the geographic position of any point on the building;
the characteristic point selection module is used for selecting characteristic points, and comprises the following specific operation steps:
SS1, under the condition that X-axis and Y-axis values are the same, extracting a maximum value and a minimum value of a Z-axis, combining the X-axis and Y-axis values to form a pair of characteristic points, establishing a mapping relation, repeating the operations, and forming a first group of characteristic points;
SS2, selecting characteristic points with the same Z-axis value from the first group of characteristic points, forming a plane top surface characteristic point group if the number of the characteristic points is more than 1, and selecting characteristic points with the nearest X-axis, Y-axis and Z-axis values of the characteristic points to form a cambered surface top surface characteristic point group if the number of the characteristic points is=1;
the house type obtaining module is spliced and combined into a floor plan according to house type plan issued by a house renting website or a property; the transmitting module transmits the plane top surface characteristic point group, the cambered surface top surface characteristic point group and the floor plan to the white mold generating module, and transmits the two-dimensional picture data to the texture extracting module;
the white mold generating module is used for generating a building white mold, and specifically comprises the following steps:
i, constructing a plane top surface and a cambered surface top surface according to the plane top surface characteristic point group and the cambered surface top surface characteristic point group, and smoothing the plane top surface and the cambered surface top surface through a smoothing algorithm to form a three-dimensional top surface of the building;
II, selecting an extreme value of an X-axis value and an extreme value of a Y-axis value in the plane top surface characteristic point group, extracting the characteristic points to form a perimeter characteristic point, so that the perimeter of the top surface of the building can be formed, selecting the characteristic point corresponding to the plane top surface characteristic point according to the mapping relation in the step SS1 to form a termination characteristic point group, selecting the extreme value of the X-axis value and the extreme value of the Y-axis value under the condition that the Z-axis values are the same, extracting the characteristic points to form the perimeter characteristic point, and thus constructing the termination perimeter;
III, taking the perimeter of the top surface of the building as the beginning and the ending perimeter as the ending, generating a side surface of the building downwards, and finally forming a white building pre-mold according to the three-dimensional top surface of the building;
IV, the vertical wall top view in the floor plan corresponds to the plane top surface characteristic point group, so that a floor vertical wall characteristic point group is formed, the circumference of the floor vertical wall is formed, the plane where the circumference is terminated is the end, and the step III is repeated to generate the inner face of the building, and the building white mould is obtained;
the texture extraction module is used for extracting side textures and top textures of the building in the two-dimensional picture data; and the three-dimensional model generating module maps the side texture and the top texture of the building to the white model of the building to obtain the three-dimensional model of the building.
Specifically, in the process of building a three-dimensional model of a building, a vertical wall top view in a floor plan view corresponds to a plane top surface characteristic point group, so that a floor vertical wall characteristic point group is formed, the circumference of the floor vertical wall is formed, the plane where the circumference is terminated is used as the end, the inner face of the building is repeatedly generated, and the white model of the building is obtained, so that the three-dimensional model of the building has an inner structure, the three-dimensional model is enriched, meanwhile, the side texture and the top texture of the building in two-dimensional picture data are extracted, and then the side texture and the top texture of the building are mapped on the white model of the building, so that the three-dimensional model of the building is obtained.
The working principle and the using flow of the invention are as follows: the two-dimensional picture data are formed by shooting the appearance picture of the building through shooting equipment, the geographic position of any point on the building is obtained, the selection of the subsequent characteristic points is simpler and more convenient, the construction process of the three-dimensional top surface of the building is simplified, the construction calculation amount of the white mould of the building is reduced, the construction cost is reduced, the construction efficiency is improved, the floor plan is spliced and combined according to the house type plan issued by a house renting website or property, the characteristic point group of the top surface and the characteristic point group of the cambered surface are selected according to the geographic position, the top surface and the cambered surface are constructed according to the characteristic point group of the top surface and the characteristic point group of the cambered surface, the top surface and the cambered surface are subjected to smoothing processing through a smoothing algorithm to form the three-dimensional top surface of the building, the extreme value of the X-axis numerical value and the extreme value of the Y-axis numerical value in the characteristic point group of the top surface are selected, extracting the characteristic points to form perimeter characteristic points so as to form the perimeter of the top surface of the building, selecting characteristic points corresponding to the characteristic points of the top surface of the plane to form a termination characteristic point group, selecting extreme values of X-axis values and extreme values of Y-axis values under the condition that the Z-axis values are the same, extracting the characteristic points to form the perimeter characteristic points so as to construct termination perimeter, taking the perimeter of the top surface of the building as the starting point and the termination perimeter as the ending point, generating the side surface of the building downwards, finally forming a white building mold pre-mold according to the three-dimensional top surface of the building, enabling the top view of the vertical wall in the floor plan to correspond to the characteristic point group of the top surface of the plane so as to form a floor vertical wall characteristic point group, forming the perimeter of the floor vertical wall, repeatedly generating the inner surface of the building with the plane where the termination perimeter is located as the ending point, thus obtaining the white building mold, the three-dimensional model is enriched, meanwhile, the side texture and the top texture of the building in the two-dimensional picture data are extracted, and then the side texture and the top texture of the building are mapped on the building white mold, so that the three-dimensional model of the building is obtained, and the operation is completed.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The method for acquiring the three-dimensional model of the building is characterized by comprising the following specific steps of:
step one: building data are collected: shooting an appearance diagram of a building through shooting equipment to form two-dimensional picture data, simultaneously acquiring the geographic position of any point on the building, and splicing and combining the two-dimensional picture data into a floor plan according to house renting websites or house type plan issued by property;
step two: building a three-dimensional top surface of a building: selecting a plane top surface characteristic point group and an arc surface top surface characteristic point group according to the geographic position in the first step, constructing a plane top surface and an arc surface top surface according to the plane top surface characteristic point group and the arc surface top surface characteristic point group, and smoothing the plane top surface and the arc surface top surface through a smoothing algorithm to form a three-dimensional top surface of the building;
step three: building a building white mold: selecting an extreme value of an X-axis value and an extreme value of a Y-axis value in a plane top surface characteristic point group, extracting the characteristic points to form a perimeter characteristic point, so that the circumference of the building top surface can be formed, selecting characteristic points corresponding to the plane top surface characteristic points to form a termination characteristic point group, selecting the extreme value of the X-axis value and the extreme value of the Y-axis value under the condition that the Z-axis values are the same, extracting the characteristic points to form the perimeter characteristic points, so that a termination circumference is constructed, starting with the circumference of the building top surface, ending with the termination circumference, downwards generating a building side surface, finally forming a building white mold pre-mold according to the three-dimensional top surface of the building, enabling a vertical wall top view in a floor plan to correspond to the plane top surface characteristic point group, forming a floor vertical wall characteristic point group, further forming the circumference of the floor vertical wall, ending with the plane where the termination circumference is located, repeatedly generating an inner surface of the building, and obtaining a building white mold;
step four: building a three-dimensional building model: and extracting the side texture and the top texture of the building in the two-dimensional picture data, and mapping the side texture and the top texture of the building on the building white mold to obtain the three-dimensional building model.
2. The method for obtaining a three-dimensional model of a building according to claim 1, wherein the specific process of selecting the set of planar top surface feature points and the set of cambered top surface feature points in the second step is as follows: under the condition that the X-axis value and the Y-axis value are the same, extracting the maximum value and the minimum value of the Z-axis, combining the X-axis value and the Y-axis value to form a pair of characteristic points, establishing a mapping relation, repeating the operation to form a first group of characteristic points, selecting the characteristic points with the same Z-axis value from the first group of characteristic points, forming a plane top characteristic point group if the number of the characteristic points is more than 1, and selecting the characteristic point closest to the X-axis value, the Y-axis value and the Z-axis value of the characteristic points to form a cambered surface top characteristic point group if the number of the characteristic points is less than 1.
3. The system for acquiring the three-dimensional model of the building is characterized by comprising a data acquisition end and a model construction end; the data acquisition end comprises a camera module, a coordinate acquisition module, a characteristic point selection module, a house type acquisition module and a sending module; the model building end comprises a white model generation module, a texture extraction module and a three-dimensional model generation module;
the camera module is used for shooting an appearance image of a building to form two-dimensional image data; the coordinate acquisition module is used for acquiring the geographic position of any point on the building and sending the geographic position to the characteristic point selection module; wherein, the specific operation of obtaining the geographic position of any point on the building is as follows:
s1, obtaining geographic coordinates of shooting equipment to form origin coordinates;
s2, establishing a space coordinate system with an origin coordinate as an initial point according to a shooting range of shooting equipment, selecting a geographic coordinate point in the space coordinate system as a control point, enabling the control point to correspond to a pixel point in an imaging matrix of the shooting equipment, guiding the control point and the pixel point into a geographic coordinate conversion unit, and further obtaining geographic coordinates of other pixel points in the imaging matrix according to projection transformation and coordinate conversion;
s3, deriving the geographic coordinates of each point of the building according to the pixel point of the building, and obtaining the geographic position of any point on the building;
the characteristic point selection module is used for selecting characteristic points, and comprises the following specific operation steps:
SS1, under the condition that X-axis and Y-axis values are the same, extracting a maximum value and a minimum value of a Z-axis, combining the X-axis and Y-axis values to form a pair of characteristic points, establishing a mapping relation, repeating the operations, and forming a first group of characteristic points;
and SS2, selecting characteristic points with the same Z-axis value from the first group of characteristic points, forming a plane top surface characteristic point group if the number of the characteristic points is more than 1, and selecting the characteristic point closest to the X-axis, Y-axis and Z-axis values of the characteristic points to form a cambered surface top surface characteristic point group if the number of the characteristic points is=1.
4. The system for acquiring the three-dimensional model of the building according to claim 3, wherein the house type acquisition module is spliced and combined into a floor plan according to house type plan issued by a house renting website or a property; the transmitting module transmits the plane top surface characteristic point group, the cambered surface top surface characteristic point group and the floor plan to the white mold generating module, and transmits the two-dimensional picture data to the texture extracting module.
5. A system for obtaining a three-dimensional model of a building according to claim 3, wherein the white mould generating module is configured to generate a white mould of the building, specifically:
i, constructing a plane top surface and a cambered surface top surface according to the plane top surface characteristic point group and the cambered surface top surface characteristic point group, and smoothing the plane top surface and the cambered surface top surface through a smoothing algorithm to form a three-dimensional top surface of the building;
II, selecting an extreme value of an X-axis value and an extreme value of a Y-axis value in the plane top surface characteristic point group, extracting the characteristic points to form a perimeter characteristic point, so that the perimeter of the top surface of the building can be formed, selecting the characteristic point corresponding to the plane top surface characteristic point according to the mapping relation in the step SS1 to form a termination characteristic point group, selecting the extreme value of the X-axis value and the extreme value of the Y-axis value under the condition that the Z-axis values are the same, extracting the characteristic points to form the perimeter characteristic point, and thus constructing the termination perimeter;
III, taking the perimeter of the top surface of the building as the beginning and the ending perimeter as the ending, generating a side surface of the building downwards, and finally forming a white building pre-mold according to the three-dimensional top surface of the building;
and IV, corresponding the vertical wall top view in the floor plan to the plane top surface characteristic point group, so as to form a floor vertical wall characteristic point group, further forming the perimeter of the floor vertical wall, and repeating the step III to generate the inner surface of the building by taking the plane where the termination perimeter is located as the end, thus obtaining the building white mould.
6. A system for obtaining a three-dimensional model of a building according to claim 3, wherein the texture extraction module is configured to extract side texture and top texture of the building in two-dimensional picture data; and the three-dimensional model generating module maps the side texture and the top texture of the building to the building white model to obtain the three-dimensional model of the building.
7. A system for obtaining a three-dimensional model of a building according to claim 3, wherein the basic method of projective transformation and coordinate transformation in step S2 employs a numerical analysis transformation method.
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| CN117272491A (en) * | 2023-11-21 | 2023-12-22 | 广东广宇科技发展有限公司 | Rapid modeling method, equipment and medium based on AI drawing model |
| CN117272491B (en) * | 2023-11-21 | 2024-05-31 | 广东广宇科技发展有限公司 | Rapid modeling method, equipment and medium based on AI drawing model |
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| CN117272491A (en) * | 2023-11-21 | 2023-12-22 | 广东广宇科技发展有限公司 | Rapid modeling method, equipment and medium based on AI drawing model |
| CN117272491B (en) * | 2023-11-21 | 2024-05-31 | 广东广宇科技发展有限公司 | Rapid modeling method, equipment and medium based on AI drawing model |
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