CN110096143B - Method and device for determining attention area of three-dimensional model - Google Patents
Method and device for determining attention area of three-dimensional model Download PDFInfo
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- CN110096143B CN110096143B CN201910269921.0A CN201910269921A CN110096143B CN 110096143 B CN110096143 B CN 110096143B CN 201910269921 A CN201910269921 A CN 201910269921A CN 110096143 B CN110096143 B CN 110096143B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
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Abstract
The embodiment of the invention discloses a method and a device for determining a region of interest of a three-dimensional model, wherein the method comprises the following steps: acquiring the current camera observation point position and the camera sight line direction according to the current display interface of the three-dimensional model; determining a current view center point according to the camera observation point position and the camera sight line direction; acquiring the geometric center position of a target sub-model, and calculating the spacing distance between the camera observation point position and the geometric center position; and determining a region of interest of the current three-dimensional model according to the interval distance and the view center point. The misjudgment rate of the user attention area is greatly reduced, the user attention content is displayed in the interface, and the resource utilization rate is further improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of computers, in particular to a method and a device for determining a region of interest of a three-dimensional model.
Background
In a scene of browsing a three-dimensional model, a position of a user's viewpoint and a direction of sight can be freely changed according to a given interactive mode, sometimes it is necessary to intelligently identify a user's region of interest according to an image finally presented on a user's screen, and dynamically modify rendering contents according to the user's region of interest.
In identifying the region of interest, existing methods detect whether the center of the model of interest is in the current field of view. For example: when the observation point of the user is far away from the concerned model, the details of the model are not visible, the concerned area when the user observes for a long distance is in the peripheral information, and the concerned area is misjudged as the model because the center of the model is still in the visual field; when a user observation point outwards observes the model in the model, the attention area can be mistakenly judged as other peripheral information because the center point of the model is not in the visual field behind the visual line direction; when the user magnifies and observes a part of the model from the outside of the model, the region of interest may be erroneously determined as the periphery because the center point of the model is not in the field of view.
Therefore, in the prior art, a large error exists in the identification of the attention area at certain specific angles, which causes a judgment error of the attention area of the user, thereby causing a waste of resources due to the fact that contents which are not concerned by the user are displayed in an interface.
Disclosure of Invention
Because the existing method has the problems, the embodiment of the invention provides a method and a device for determining a region of interest of a three-dimensional model.
In a first aspect, an embodiment of the present invention provides a method for determining a region of interest of a three-dimensional model, including:
acquiring the current camera observation point position and the camera sight line direction according to the current display interface of the three-dimensional model;
determining a current view center point according to the camera observation point position and the camera sight line direction;
acquiring the geometric center position of a target sub-model, and calculating the spacing distance between the camera observation point position and the geometric center position;
determining a region of interest of the current three-dimensional model according to the interval distance and the view center point;
wherein the target sub-model is a sub-model of the three-dimensional model.
In a second aspect, an embodiment of the present invention further provides an apparatus for determining a region of interest of a three-dimensional model, including:
the position acquisition module is used for acquiring the current camera observation point position and the camera sight line direction according to the current display interface of the three-dimensional model;
the visual field determining module is used for determining the current visual field central point according to the camera observation point position and the camera sight line direction;
the distance calculation module is used for acquiring the geometric center position of the target sub-model and calculating the spacing distance between the camera observation point position and the geometric center position;
the attention area determining module is used for determining an attention area of the current three-dimensional model according to the interval distance and the view center point;
wherein the target sub-model is a sub-model of the three-dimensional model.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, which when called by the processor are capable of performing the above-described methods.
In a fourth aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium storing a computer program, which causes the computer to execute the above method.
According to the technical scheme, the geometric center position of the current view center point and the target sub-model is determined, the interval distance between the camera observation point position and the geometric center position is calculated, and the attention area of the current three-dimensional model is determined according to the interval distance and the view center point, so that the misjudgment rate of the attention area of the user is greatly reduced, the attention content of the user is displayed in the interface, and the utilization rate of resources is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for determining a region of interest of a three-dimensional model according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a position of a three-dimensional model according to an embodiment of the present invention;
FIG. 3 is a rendering diagram of a three-dimensional model according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for determining a region of interest of a three-dimensional model according to an embodiment of the present invention;
fig. 5 is a logic block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows a flowchart of a method for determining a region of interest of a three-dimensional model according to this embodiment, which includes:
s101, acquiring the current camera observation point position and the current camera sight line direction according to the current display interface of the three-dimensional model.
Specifically, the three-dimensional model is a model that can perform operations such as three-dimensional rotation, movement, and the like, and includes, for example, a three-dimensional map model of a street, a house, and the like.
The camera observation point position is the position of the observation point in the three-dimensional model corresponding to the display interface of the current three-dimensional model obtained according to the three-dimensional modeling theory.
And the sight direction of the camera is the sight direction corresponding to the display interface of the current three-dimensional model obtained according to a three-dimensional modeling theory.
For example, in the real world, the coordinates corresponding to the position of the camera viewing point are photographed along the direction of the camera line of sight, and the obtained image is the same as the current display interface.
And S102, determining the current center point of the view according to the camera observation point position and the camera sight line direction.
Specifically, a point projected to the current display interface from the camera viewpoint position along the camera sight line direction is a current view center point.
S103, acquiring the geometric center position of the target sub-model, and calculating the separation distance between the camera observation point position and the geometric center position.
The target sub-model is a sub-model of the three-dimensional model, and the target sub-model is a current concerned object and can be a cell, a building or a suite.
The geometric center position of the target sub-model is the center position of the current concerned object. For example, if the current object of interest is a cell, the footprint of the cell is a rectangle, the highest floor height is 50 meters, and the geometric center position is 25 meters from the center point of the rectangle.
The separation distance between the camera viewpoint position and the geometric center position is the Euclidean distance between the two points.
And S104, determining a region of interest of the current three-dimensional model according to the interval distance and the view center point.
Specifically, the distance is judged, and the position relationship between the view center point and the target sub-model is judged, so that the attention area of the current three-dimensional model is determined.
According to the method and the device, the separation distance between the position of the camera observation point and the geometric center position is calculated by determining the current visual field center point and the geometric center position of the target sub-model, and the attention area of the current three-dimensional model is determined according to the separation distance and the visual field center point, so that the misjudgment rate of the attention area of the user is greatly reduced, the attention content of the user is displayed in an interface, and the utilization rate of resources is further improved.
Further, on the basis of the above method embodiment, S102 specifically includes:
and acquiring a ray of the camera observation point position along the sight line direction of the camera, acquiring an intersection point of the ray and the ground in the three-dimensional model, and determining the intersection point as the view center point.
Specifically, firstly, a ray is emitted along the sight line direction of the camera by taking the observation point position of the camera as a starting point, and the intersection point of the ray and the ground is taken, and the intersection point is the center point of the field of view.
By acquiring the intersection point of the ray and the ground, the central point of the visual field can be conveniently and accurately determined.
Further, on the basis of the above method embodiment, the acquiring the geometric center position of the target sub-model in S103 specifically includes:
and constructing a cube packing box for the target submodel, as shown in fig. 2, calculating the central position of the cube packing box, and taking the central position of the cube packing box as the geometric central position of the target submodel.
Specifically, when the target sub-model is a cell, the cube wrapping box may be a smallest cube that can wrap the entire cell.
By constructing the cube wrapping box, the geometric center position of the target sub-model is conveniently and quickly determined, namely the geometric center position of the target sub-model is the center point of the cube.
Further, on the basis of the above method embodiment, after S102, the method further includes:
and S1023, judging whether the view center point is outside the current screen, and if so, determining that the attention area of the current three-dimensional model is a model distant area.
S104 specifically comprises the following steps:
s1041, if the interval distance is judged to be smaller than a first preset value and the view center point is in the cube packaging box, determining the concerned area of the current three-dimensional model as the target sub-model;
s1042, if the interval distance is judged to be smaller than the first preset value and the view center point is not in the cube packaging box, determining that the attention area of the current three-dimensional model is the surrounding environment;
s1043, if the interval distance is judged to be larger than the first preset value and smaller than the second preset value, determining that the attention area of the current three-dimensional model is the surrounding environment;
and S1044, if the interval distance is judged to be larger than the second preset value, determining that the concerned area of the current three-dimensional model is far away from the model.
The first preset value and the second preset value are preset distance values.
Specifically, the attention area of the current three-dimensional model is divided into three categories: model remote, target sub-model and surrounding environment.
The concerned region is a model far distance and represents that the current concerned content of the user is a place away from a preset distance of the target sub-model, for example, a place away from the target sub-model by 100 meters; the concerned area is a target sub-model which represents that the content concerned by the user is the target sub-model; the focus area is a surrounding environment indicating that the content currently focused on by the user is a place within a preset distance from the target sub-model, for example, a place within 100 meters from the target sub-model.
According to the relation between the spacing distance and the first preset value/the second preset value, the distance condition between the observation point and the observed target sub-model can be determined; whether the target submodel can be observed or not can be determined according to the relation between the view center point and the target submodel. And combining the two conditions, the current attention area of the user can be accurately determined.
Taking a certain cell as an example, as shown in fig. 2, when actually determining a region of interest of a three-dimensional model, the method includes the following steps:
a1, constructing a cube package box with the smallest cell, for example, acquiring the highest point of the cell and four outermost points (the most east point, the most south point, the most west point and the most north point) in the four directions of the east, the south, the most west point and the most north point, and constructing the smallest cube package box by using the horizontal plane with the highest point, the two south and north faces with the most east point and the most west point, the two east and west faces with the most south point and the most north point, and the ground;
a2, obtaining the camera observation point position P of the current three-dimensional model0；
A3, obtaining the camera sight line direction v of the current three-dimensional model, and calculating P according to the conventional geometric calculation formula0The point of intersection with the ground in the v-direction, i.e. the centre point of view position P1；
A4, obtaining the geometric center position P of the cubic parcel box2；
A5, calculating to obtain P0And P2The distance value between is d;
a6, discussed in terms of the value of d:
if d is<1000 and center point of view position P1If the center of the cube packaging box or the model is in the visual field, the area concerned by the user is judged to be the cell;
if d is<1000 and center point of view position P1If the user is not in the cubic packaging box or the center of the model is not in the visual field, the user attention area is judged to be the surrounding environment of the cell;
if d > is 1000 and d <2000, determining that the user attention area is the surrounding environment of the cell;
if d > is 2000, the user attention area is determined to be the model distant of the cell.
In the embodiment, the attention area of the user can be conveniently and accurately analyzed and judged by comprehensively considering the factors of the position of the center point of the visual field, the position of the geometric center of the target sub-model, the position of the camera observation point and the interval distance between the position of the camera observation point and the position of the geometric center.
Further, on the basis of the above embodiment of the method, the method further comprises:
and S105, determining corresponding rendering contents according to the attention area, and rendering the current display interface according to the rendering contents.
Specifically, when the attention area of the user is far away from the model, the rendering content of the current display interface can select the whole situation around the cell, such as a key landmark of a park, a subway line, a city, and the like; when the attention area of the user is the surrounding environment, the rendering content of the current display interface can select the traffic condition, road name, market and the like around the cell, as shown in fig. 3; when the concerned area of the user is the target sub-model, the rendering content of the current display interface can select the information of the greening area, the building height, the supporting facilities of the current cell, or the area, the house type and the like of the current house, so that the user can conveniently check the information.
Fig. 4 shows a schematic structural diagram of an apparatus for determining a region of interest of a three-dimensional model according to this embodiment, the apparatus includes: a position acquisition module 401, a field of view determination module 402, a distance calculation module 403, and a region of interest determination module 404, wherein:
the position obtaining module 401 is configured to obtain a current camera viewpoint position and a current camera sight line direction according to a current display interface of the three-dimensional model;
the view determination module 402 is configured to determine a current view center point according to the camera viewpoint position and the camera sight line direction;
the distance calculation module 403 is configured to obtain a geometric center position of a target sub-model, and calculate a separation distance between the camera viewpoint position and the geometric center position;
the attention area determining module 404 is configured to determine an attention area of the current three-dimensional model according to the separation distance and the center point of the field of view;
wherein the target sub-model is a sub-model of the three-dimensional model.
Specifically, the position obtaining module 401 obtains a current camera viewpoint position and a camera sight line direction according to a current display interface of the three-dimensional model; the view determination module 402 determines a current view center point according to the camera viewpoint position and the camera gaze direction; the distance calculation module 403 obtains the geometric center position of the target sub-model, and calculates the separation distance between the camera viewpoint position and the geometric center position; the region-of-interest determination module 404 determines a region of interest of the current three-dimensional model according to the separation distance and the center point of the field of view.
According to the method and the device, the separation distance between the position of the camera observation point and the geometric center position is calculated by determining the current visual field center point and the geometric center position of the target sub-model, and the attention area of the current three-dimensional model is determined according to the separation distance and the visual field center point, so that the misjudgment rate of the attention area of the user is greatly reduced, the attention content of the user is displayed in an interface, and the utilization rate of resources is further improved.
Further, on the basis of the above apparatus embodiment, the field-of-view determining module 402 is specifically configured to emit a ray from the camera viewpoint position along the camera sight line direction, acquire an intersection point of the ray and the ground in the three-dimensional model, and determine the intersection point as the field-of-view center point.
Further, on the basis of the above embodiment of the apparatus, the apparatus further comprises:
and the view field judging module is used for determining the attention area of the current three-dimensional model as the model distance if the view field central point is judged and known to be out of the current screen.
Further, on the basis of the above apparatus embodiment, the distance calculating module 403 is specifically configured to construct a cube parcel box for the target sub-model, and calculate a central position of the cube parcel box as a geometric central position of the target sub-model.
Further, on the basis of the above apparatus embodiment, the region of interest determining module 404 is specifically configured to:
if the interval distance is judged to be smaller than a first preset value and the view center point is in the cube packaging box, determining the concerned area of the current three-dimensional model as the target sub-model;
if the interval distance is judged to be smaller than the first preset value and the view center point is not in the cube packaging box, determining that the attention area of the current three-dimensional model is the surrounding environment;
if the interval distance is judged to be larger than the first preset value and smaller than the second preset value, determining that the attention area of the current three-dimensional model is the surrounding environment;
and if the interval distance is judged to be larger than the second preset value, determining that the attention area of the current three-dimensional model is the model far distance.
Further, on the basis of the above apparatus embodiment, the target submodel includes: a community, a building or a suite of houses.
Further, on the basis of the above embodiment of the apparatus, the apparatus further comprises:
and the interface rendering module is used for determining corresponding rendering content according to the attention area and rendering the current display interface according to the rendering content.
The apparatus for determining a region of interest of a three-dimensional model according to this embodiment may be used to implement the method embodiments, and the principle and technical effect are similar, which are not described herein again.
Referring to fig. 5, the electronic device includes: a processor (processor)501, a memory (memory)502, and a bus 503;
wherein the content of the first and second substances,
the processor 501 and the memory 502 are communicated with each other through the bus 503;
the processor 501 is used to call program instructions in the memory 502 to perform the methods provided by the above-described method embodiments.
The present embodiments disclose a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided by the above-described method embodiments.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the method embodiments described above.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
It should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for determining a region of interest of a three-dimensional model, comprising:
acquiring the current camera observation point position and the camera sight line direction according to the current display interface of the three-dimensional model;
determining a current view center point according to the camera observation point position and the camera sight line direction;
acquiring the geometric center position of a target sub-model, and calculating the spacing distance between the camera observation point position and the geometric center position; the obtaining of the geometric center position of the target sub-model specifically includes: constructing a cube wrapping box for the target submodel, calculating the central position of the cube wrapping box, and taking the central position of the cube wrapping box as the geometric central position of the target submodel;
determining a region of interest of the current three-dimensional model according to the interval distance and the view center point; the determining the attention area of the current three-dimensional model according to the interval distance and the view center point specifically comprises:
if the interval distance is judged to be smaller than a first preset value and the view center point is in the cube packaging box, determining the concerned area of the current three-dimensional model as the target sub-model;
if the interval distance is judged to be smaller than the first preset value and the view center point is not in the cube packaging box, determining that the attention area of the current three-dimensional model is the surrounding environment;
if the interval distance is judged to be larger than the first preset value and smaller than the second preset value, determining that the attention area of the current three-dimensional model is the surrounding environment;
if the interval distance is judged to be larger than the second preset value, determining that the attention area of the current three-dimensional model is the model distance;
wherein the target sub-model is a sub-model of the three-dimensional model.
2. The method according to claim 1, wherein determining a current center point of view from the camera viewpoint position and the camera gaze direction comprises:
and acquiring a ray of the camera observation point position along the sight line direction of the camera, acquiring an intersection point of the ray and the ground in the three-dimensional model, and determining the intersection point as the view center point.
3. The method of claim 2, wherein after determining a current center point of view from the camera viewpoint location and the camera gaze direction, further comprising:
and judging whether the view center point is outside the current screen, if so, determining that the attention area of the current three-dimensional model is a model remote area.
4. The method of claim 1, wherein the target sub-model comprises: a community, a building or a suite of houses.
5. The method of claim 1, further comprising:
and determining corresponding rendering content according to the attention area, and rendering the current display interface according to the rendering content.
6. An apparatus for determining a region of interest of a three-dimensional model, comprising:
the position acquisition module is used for acquiring the current camera observation point position and the camera sight line direction according to the current display interface of the three-dimensional model;
the visual field determining module is used for determining the current visual field central point according to the camera observation point position and the camera sight line direction;
the distance calculation module is used for acquiring the geometric center position of the target sub-model and calculating the spacing distance between the camera observation point position and the geometric center position;
the distance calculation module is specifically used for constructing a cube packing box for the target submodel, and calculating the central position of the cube packing box as the geometric central position of the target submodel;
the attention area determining module is used for determining an attention area of the current three-dimensional model according to the interval distance and the view center point;
the concerned area determining module is specifically used for determining the concerned area of the current three-dimensional model as the target sub-model if the interval distance is smaller than a first preset value and the view center point is in the cube packaging box; if the interval distance is judged to be smaller than the first preset value and the view center point is not in the cube packaging box, determining that the attention area of the current three-dimensional model is the surrounding environment; if the interval distance is judged to be larger than the first preset value and smaller than the second preset value, determining that the attention area of the current three-dimensional model is the surrounding environment; if the interval distance is judged to be larger than the second preset value, determining that the attention area of the current three-dimensional model is the model distance;
wherein the target sub-model is a sub-model of the three-dimensional model.
7. An electronic device, comprising:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 5.
8. A non-transitory computer-readable storage medium storing a computer program that causes a computer to perform the method according to any one of claims 1 to 5.
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| 一种视线方向的三维估计方法;王长元等;《计算机与数字工程》;20160320(第03期);全文 * |
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| CN110096143A (en) | 2019-08-06 |
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