CN111915711A - Method and device for acquiring stereoscopic images of three-tone ground-type patches supporting virtual VR - Google Patents

Abstract

The invention relates to the technical field of image processing, and discloses a method and a device for obtaining a stereoscopic image of a three-tone ground-type patch supporting virtual VR. The method includes: acquiring vector tile block data corresponding to the three-tone ground-type patch; The vector tile block data is processed to obtain multiple initial geometric figures, and the corresponding geographic types are obtained; the corresponding initial geometric figures are color-rendered according to the geographic types to obtain multiple terrain patches; the terrain patches are combined Obtain a two-dimensional texture map, determine the target ground pattern, stretch the target ground pattern, and generate a three-tone ground pattern stereo image. The present invention obtains a plurality of initial geometric figures by processing the vector tile block data, then performs color rendering on each initial geometric figure, and obtains the target ground pattern, and finally stretches the target ground pattern to obtain the target ground pattern. Generate three-dimensional stereoscopic images with strong three-dimensional sense and support virtual VR display.

Description

Method and device for acquiring stereoscopic images of three-tone ground-type patches supporting virtual VR

technical field

The invention relates to the technical field of image processing, and in particular, to a method, device, device and storage medium for obtaining a three-tone ground-type spot stereo image that supports virtual VR.

Background technique

With the development of society and the progress of science, 3D stereo images are gradually applied in all aspects of life, for example, watching 3D movies or 3D terrain images. The main form is the form, and the vector rasterized image is used as a terrain texture to fit on the terrain surface, but the image obtained is essentially a two-dimensional raster image. In this way, the boundaries of the types of patches are not obvious, and the attributes of different types of patches can only be distinguished by configuring the color or symbol style. The three-dimensional sense is not strong, and the virtual VR display cannot be supported. Therefore, it is an urgent technical problem to be solved how to obtain a stereoscopic image of three-tone ground-type spots that has a strong three-dimensional sense and supports virtual VR display.

The above content is only used to assist the understanding of the technical solutions of the present invention, and does not mean that the above content is the prior art.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a method, device, device and storage medium for obtaining a three-tone stereoscopic image of a spot pattern that supports virtual VR. Technical Problems of Geo-pattern Stereo Imagery.

In order to achieve the above object, the present invention provides a method for obtaining a stereoscopic image of a three-tone ground-type patch supporting virtual VR, and the method for obtaining a three-tone ground-type stereoscopic image supporting virtual VR includes the following steps:

Obtaining vector tile data corresponding to the three-tone ground pattern, and processing the vector tile data to obtain an initial geometric image, where the initial geometric image includes a plurality of initial geometric figures;

Get the geographic type corresponding to each initial geometry;

Color rendering is performed on the corresponding initial geometric figures according to the geographic types, respectively, to obtain a plurality of geographic map spots;

combining the ground pattern patches to obtain a two-dimensional texture map;

The target ground pattern is determined according to the two-dimensional texture map, and the target ground pattern is stretched to generate a three-tone ground pattern three-dimensional image.

Preferably, the step of processing the vector tile data to obtain an initial geometric image includes:

converting the vector tile data into spatial data, the spatial data including point data, line data and area data;

An initial geometric image is generated from the point data, the line data and the area data.

Preferably, the step of performing color rendering on the corresponding initial geometric figures according to the geographic types to obtain a plurality of geographic patches includes:

Obtain the triangulation corresponding to each initial geometric figure through the triangulation construction algorithm;

generating a basic graphics drawing unit according to the triangulation;

Find the style configuration files corresponding to the geographic types respectively;

Color rendering is performed on the corresponding initial geometric figures according to the style configuration file and the basic figure drawing unit to obtain a plurality of terrain patches.

Preferably, the step of determining the target ground pattern according to the two-dimensional texture map includes:

Using the geographic type as a key object, and obtaining a target style identifier corresponding to the key object according to a preset key-value pair;

Determine the target ground type patch according to the target style identifier and the two-dimensional texture map.

Preferably, the step of stretching the target ground pattern to generate a stereoscopic image of the three-tone ground pattern includes:

Obtain the reference vertex coordinate set of the target ground pattern;

According to the preset coordinate height threshold, longitudinally stretch the target terrain patch to obtain the stretched target terrain patch;

Obtain the stretched vertex coordinate set corresponding to the stretched target ground pattern;

A three-tone ground-like patch stereo image is generated according to the reference vertex coordinate set and the stretched vertex coordinate set.

Preferably, the step of generating a stereoscopic image of three-tone ground pattern spots according to the reference vertex coordinate set and the stretched vertex coordinate set includes:

Constructing a side hollow figure area according to the reference vertex coordinate set and the stretch vertex coordinate set;

performing color rendering on the side cavity graphic area to obtain a side texture map;

According to the stretched target terrain patch and the side texture map, a three-tone terrain patch stereo image is generated.

Preferably, after the step of determining the target terrain patch according to the two-dimensional texture map and stretching the target terrain patch to generate a three-tone stereoscopic image of the terrain patch, the method further includes:

Obtain the position information corresponding to the logical camera and the stereo image of the three-tone ground pattern;

Determine the position distance of the rendering camera group according to the position information, the rendering camera group includes a first rendering camera and a second rendering camera;

respectively setting a first rendering viewport corresponding to the first rendering camera and a second rendering viewport corresponding to the second rendering camera according to the position distance;

using the first rendering viewport and the second rendering viewport as target rendering viewports;

A virtual VR display is performed on the three-tone ground-like patch stereoscopic image through the target rendering viewport.

In addition, in order to achieve the above object, the present invention also proposes a three-tone ground-type patch stereo image acquisition device supporting virtual VR, and the three-tone ground-type patch stereo image acquisition device supporting virtual VR includes:

an acquisition module, configured to acquire vector tile data corresponding to the three-tone ground pattern, and process the vector tile data to obtain an initial geometric image, where the initial geometric image includes a plurality of initial geometric figures;

The obtaining module is also used to obtain the geographic type corresponding to each initial geometric figure;

a rendering module, configured to perform color rendering on the corresponding initial geometric figures according to the geographic types, respectively, to obtain a plurality of geographic map spots;

a combination module, used for combining the ground pattern patches to obtain a two-dimensional texture map;

The generating module is configured to determine the target ground pattern according to the two-dimensional texture map, and stretch the target ground pattern to generate a three-tone ground pattern three-dimensional image.

In the present invention, the vector tile block data corresponding to the three-tone ground pattern is first obtained. In order to speed up the data processing efficiency, the vector tile block data can be processed to obtain a plurality of initial geometric figures, and then the corresponding initial geometric figures are obtained. Geographic type, and color-render the corresponding initial geometric figures according to the geographic type, so as to obtain multiple ground-type patches that are easy to distinguish geographic types, and then combine the ground-type patches to obtain a two-dimensional texture map. The texture map determines the target ground pattern, and stretches the target ground pattern to generate a three-dimensional three-dimensional ground pattern stereo image with strong three-dimensional sense and support for virtual VR display.

Description of drawings

FIG. 1 is a schematic flowchart of a first embodiment of a method for obtaining a three-tone ground-type spot stereoscopic image that supports virtual VR according to the present invention;

2 is a scatter diagram of a set of pixel coordinates of preset orientations according to the first embodiment of a method for obtaining a stereoscopic image of three-tone ground-type spots supporting virtual VR according to the present invention;

FIG. 3 is a side view of a hollow figure area of a first embodiment of a method for obtaining a stereoscopic image of three-tone ground-type spots supporting virtual VR according to the present invention;

FIG. 4 is a schematic flowchart of a second embodiment of a method for obtaining a stereoscopic image of a three-tone ground pattern spot supporting virtual VR according to the present invention;

FIG. 5 is a structural block diagram of a first embodiment of an apparatus for obtaining a stereoscopic image of three-tone ground-type patches supporting virtual VR according to the present invention.

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Referring to FIG. 1, FIG. 1 is a schematic flowchart of a first embodiment of a method for obtaining a stereoscopic image of a three-tone ground type spot that supports virtual VR according to the present invention. Example.

In the first embodiment, the method for obtaining a stereoscopic image of a three-tone ground pattern spot supporting virtual VR includes the following steps:

Step S10 : obtaining vector tile data corresponding to the three-tone ground pattern, and processing the vector tile data to obtain an initial geometric image, where the initial geometric image includes a plurality of initial geometric figures.

It should be noted that the execution body of this embodiment is a three-tone ground-type patch stereo image acquisition device that supports virtual VR, wherein the device is a virtual VR that supports functions such as image processing, data processing, network communication, and program running. The device for obtaining the stereoscopic image of the three-tone ground pattern spot can also be other devices, which is not limited in this embodiment.

Among them, "the third national land survey" is abbreviated as "three surveys". One of the results of the three surveys is the land classification data, that is, the land classification map. That is to say, the land classification data of the third national land survey is called the land classification data. The three-tone earth pattern pattern is then obtained according to the three-tone earth pattern pattern, and the three-tone earth pattern pattern data is stored in the database in the form of vector data.

In order to speed up the display efficiency of data, these vector data are cut into blocks according to certain rules to form vector tiles. It can be understood that, according to the camera frustum in the 3D scene to obtain the current required vector tile coverage, calculate the required vector tile block row and column number according to the vector tile coverage, and obtain the corresponding vector tile block , and then request the corresponding vector tile block data from the database through the data service, and save it to the system for caching.

In addition, the vector tile data is converted into spatial data, the spatial data includes point data, line data and area data, and then the point data, line data and area data are combined to obtain an initial geometric image, that is , the vector tile data is stored in the database in the form of json_encode, and the client needs to parse the json_encode data after loading, convert the string into the memory organization of points, lines and surfaces, and then combine the points, lines and surfaces to An initial geometric image is obtained, where the initial geometric image includes a plurality of initial geometric figures.

Step S20: Obtain the geographic type corresponding to each initial geometric figure.

The geographic types corresponding to each initial geometric figure may be the same or different. Assuming that the initial geometric image includes multiple initial geometric figures, the initial geometric figures are triangles, diamonds, rectangles, etc. If it is set to mountain, the geographic type corresponding to the diamond can be set to land, or the geographic type corresponding to the rectangle can be set to river, etc. In this scheme, the geographic type corresponding to the triangle can also be set to mountain, or the geographic type corresponding to the diamond can be set to For mountains, etc., this solution can also pre-set the geographic type corresponding to the initial geometric figure in the database, and match the initial geometric figure in the database to obtain the corresponding geographic type, which is not limited in this embodiment.

Step S30: Perform color rendering on the corresponding initial geometric figures according to the geographic types, respectively, to obtain a plurality of geographic patches.

Find the style configuration file corresponding to the geographic type respectively, then obtain the triangulation corresponding to each initial geometric figure through the triangulation network construction algorithm, and then generate the basic graphics drawing unit according to the triangular net, and finally, according to the style configuration file and the basic graphics drawing unit, the corresponding initial Geometry is color-rendered to obtain multiple terrain patches.

That is to say, the three-tone ground pattern is expressed in the form of polygons, and the parsed vector tile data of the vector tiles is stored in the initial geometric figures generated by points, lines and surfaces. These initial geometric figures cannot be Color rendering is performed directly through the 3D Application Programming Interface API. Therefore, it is necessary to generate the corresponding triangular network for each initial geometric figure through the Delaunay triangulation network construction algorithm, and then form the corresponding triangular network according to the triangular network. Basic graphics drawing unit for 3D drawing API calls for color rendering.

It can be understood that, assuming that the initial geometric figure is a rectangle, a triangle network is generated from the rectangle through the Delaunay triangle network construction algorithm, and the triangle network corresponds to two triangles, and then the basic graphics drawing unit corresponding to the rectangle is formed according to the obtained triangle network. The initial geometric figure is a triangle, and a triangular net is generated from the triangle through the Delaunay triangular net construction algorithm, and then a basic figure drawing unit corresponding to the triangle is formed according to the obtained triangular net, which is not limited in this embodiment.

The geographic types corresponding to the initial geometric figures all have corresponding style identifiers, and the style identifiers have corresponding style configuration files. The style configuration files are user-defined settings, which may include colors, symbols, and transparency that need to be rendered.

The geographic type corresponding to the initial geometric figure is used as the key object, and then the style identifier corresponding to the key object is obtained according to a preset key-value pair, where the preset key-value pair includes a geographic type and a style identifier, and the geographic type and style identifier The corresponding relationship is stored in the database in the form of key-value pairs in advance for subsequent retrieval and use. Assuming that the geographic type corresponding to the initial geometric figure is mountain and the corresponding style identifier is 1, the style configuration file corresponding to the value 1 is obtained. That is to say, each geographic type has a corresponding style configuration file, that is, the rendering color and transparency corresponding to the mountain. It can also be assumed that the geographic type corresponding to the initial geometric figure is water, and the corresponding style identifier is 1, then Configuration information such as rendering colors corresponding to water is selected from a style configuration file (the style configuration file contains configuration information corresponding to various geographic types) according to the style identifier, which is not limited in this embodiment.

Step S40 : combining the ground pattern patches to obtain a two-dimensional texture map.

The ground-type patch is the initial geometric figure that has been rendered in color. The initial geometric figures after color rendering are combined graphically to obtain the initial geometric image with color, and then the initial geometric image with color is called two-dimensional. texture map.

Assuming that the initial geometric image includes triangles, rectangles and rhombus, triangles, rectangles and rhombus are all colorless shapes, and then the triangles are rendered in yellow to form yellow triangles, and the rectangles are rendered in blue to generate blue rectangles, and the rhombus is rendered as red to generate a red rhombus, and then graphically combine the yellow triangle, the blue rectangle, and the red rhombus to obtain a two-dimensional texture map, which is the final complete land-type patch image.

Step S50: Determine a target ground patch according to the two-dimensional texture map, and stretch the target ground patch to generate a three-tone ground patch stereo image.

The geographic type is used as a key object, and a target style identifier corresponding to the key object is obtained according to a preset key-value pair, and a target land type patch is determined according to the target style identifier and the two-dimensional texture map.

Pre-store the geographic types and style identifiers corresponding to the initial geometric figures in the database, and make a one-to-one correspondence between geographic types and style identifiers in the form of key-value pairs, that is, each geographic type has a corresponding style identifier. Assuming that the initial geometric figure is a triangle, the corresponding geographic type is mountain, and the corresponding style identifier is 1. If the initial geometric figure is a rectangle, the corresponding geographic type is water, and the corresponding style identifier is 2, etc.

The way to determine the target ground type patch according to the two-dimensional texture map can be based on the style identifier or the color. If the user selects the target ground type patch with the style identifier of 1, it corresponds to a triangle. If the user selects yellow, the initial geometric figure with yellow, that is, the terrain patch, will be used as the target terrain patch, etc.

Acquire the vertex pixel coordinate set of the preset orientation corresponding to each initial geometric figure according to the vector tile data, and obtain the normal coordinate set corresponding to the target ground type patch according to the vertex pixel coordinate set, and obtain the The reference vertex coordinate set of the target terrain patch, and the target terrain patch is stretched according to the preset coordinate height threshold, that is, the polygons corresponding to different terrain patches in the same vector tile block are stretched. , respectively set the non-elevation values of the vertices, so that the different types of patches can be staggered. Because only the elevation value is modified, the polygon of the patch is always kept in the same plane, so the normal information does not need to be adjusted, which can reduce the amount of calculation and improve the work efficiency. The stretched vertex coordinate set of the target ground pattern spot after being stretched, and a three-tone ground pattern three-dimensional image is generated according to the reference vertex coordinate set and the stretched vertex coordinate set.

Further, the step of obtaining the normal coordinate set corresponding to each initial geometric figure according to the vertex pixel coordinate set of the first preset orientation includes: the vector tile block data coordinate is a pixel whose origin is the upper left corner of the tile. The coordinate set is the vertex pixel coordinate set of the preset orientation, as shown in FIG. 2 . 2 is a scatter diagram of a set of preset orientation pixel coordinates according to the first embodiment of the method for obtaining a stereoscopic image of three-tone ground-type spots supporting virtual VR according to the present invention, wherein the preset orientation pixel coordinate set can only satisfy the requirements of a two-dimensional base. It is used for drawing in the figure. In the three-dimensional scene, it needs to be drawn with a depth of field effect, so it needs to be converted into real geographic coordinates. Wherein, the coordinate conversion method may be, through the layer row and column number of the vector tile block, calculate the latitude and longitude corresponding to the east, west, north and south of the vector tile block through the first preset formula, and then according to the pixel coordinates of each vertex in the vector tile block , the latitude and longitude coordinates of each vertex can be obtained by interpolation, and then the latitude and longitude coordinates are converted into space rectangular coordinates according to the second preset formula, so that the space rectangular coordinates are used for three-dimensional scene rendering. That is, coordinate transformation is performed on the vertex pixel coordinate set of the first preset orientation to obtain a spatial rectangular coordinate set, and a normal coordinate set corresponding to each initial geometric figure is obtained according to the spatial rectangular coordinate set.

The first preset formula is:

In the formula, L is the level of the vector tile, Col is the column number of the vector tile, Row is the row number of the vector tile, TileSize is the longitude and latitude, West is the west longitude, East is the east longitude, South is the south latitude, North is the northern latitude.

The second preset formula is:

In the formula, Latitude Degree is the latitude coordinate, Longitude Degree is the longitude coordinate, x, y, z are Cartesian space Cartesian coordinates, radCosLat is the defined intermediate variable, and radius is the radius of the earth (value 6378137).

The step of obtaining the normal coordinate set corresponding to the target ground type patch according to the vertex pixel coordinate set is as follows: performing coordinate transformation on the vertex pixel coordinate set to obtain a space rectangular coordinate set, and obtaining a space rectangular coordinate set according to the spatial rectangular coordinate set. The set of normal coordinates corresponding to the target ground type patches.

In order to make the solid-color vector tiles have a three-dimensional sense in the three-dimensional scene, it is necessary to add lighting information, and the brightness and shade changes formed by the ups and downs of the terrain make the three-dimensional sense stronger. The premise of using lighting is that vertices need to have normal information. First, calculate the surface normal information of each triangle. The calculation method is to select two sides of the triangle to construct a direction vector, and perform the cross product of these two vectors to obtain the surface normal of the surface. Second, assign the value of the surface normal of the triangle. For each vertex of the triangle, a vertex may be shared by multiple triangles, then the normal of the vertex is recorded as the cumulative value of the normals of all shared triangle faces, and finally, the cumulative normal value of the vertex is normalized, Converted to a unit normal vector and passed to the GPU for use in lighting calculations.

Referring to FIG. 3 , said FIG. 3 is a side hole graphic area diagram of the first embodiment of the three-tone ground-type stereo image acquisition method supporting virtual VR of the present invention, and then color rendering is performed on the side side hole graphic area to obtain a side view A texture map, generating a three-tone three-dimensional image of the terrain patch according to the stretched target terrain patch and the side texture map.

Color rendering is performed on the side cavity graphic area, and the step of obtaining the side texture map is to generate a plurality of triangular nets from the rectangle through the Delaunay triangulation network construction algorithm, and then form the basis corresponding to the side cavity graphic area according to the obtained triangular net. The graphics drawing unit finally performs color rendering on the side hollow graphic area according to the style configuration file corresponding to the side hollow graphic area and the basic graphics drawing unit to obtain a side texture map, and the color in the style configuration file corresponding to the side hollow graphic area is To make the three-dimensional image more three-dimensional, it can be set to gray, etc., which is not limited in this embodiment.

In this solution, a stepped three-dimensional triangular mesh can also be generated from different terrain patterns in each tile block, and the top and side surfaces need to be mapped separately. In order to speed up the rendering efficiency, an integrated map can be used. Specifically, in the process described in the above embodiment, according to a grid texture that has been generated by rendering, the texture can be mapped as a whole to the undulating triangle mesh to complete the mapping. The specific mapping relationship needs to be calculated for each The texture coordinates of the vertex. That is to say, the reserved pixel coordinate value with the upper left corner of the tile as the origin, divided by the size of the vector tile, to get the normalized coordinates, and the changed coordinates are used as the texture coordinates of the vertex to complete the texture coordinates and triangle. The mapping of the network, and then through the filter condition setting, can achieve the elevation of different types of patches to different heights, but the sudden elevation is abrupt. Therefore, the height value set by the filter condition and the current height value of the terrain patch can be directly interpolated, and the height value can be adjusted in each frame of rendering to approach the set target value, so as to achieve the animation effect of height rising or falling. Makes the terrain patch have a lifting animation process, making the interaction smoother.

In addition, after the step of determining the target ground pattern according to the two-dimensional texture map, and stretching the target ground pattern to generate a three-tone ground pattern three-dimensional image, obtain the corresponding ground pattern of the logical camera. position information and a three-tone ground-like patch stereo image, determine the position distance of the rendering camera group according to the position information, the rendering camera group includes a first rendering camera and a second rendering camera, and set the said position and distance respectively according to the position distance The first rendering viewport corresponding to the first rendering camera and the second rendering viewport corresponding to the second rendering camera, the first rendering viewport and the second rendering viewport are used as the target rendering viewport, that is It is said that a virtual VR display is performed on the stereoscopic image of the three-tone ground-type patch through the target rendering viewport. The specific implementation manner of this embodiment can complete the normal rendering operation in the 3D scene, but in order to support the virtual VR display, in addition, the rendering capability of supporting stereo image pairs needs to be extended. Therefore, three cameras, one logical camera and two rendering cameras, can be set up in the 3D scene. In the virtual VR display mode, the application can only control the logical camera, and the 3D interaction and animation process in the above steps are only linked to the logical camera; the orientation of the two rendering cameras and the logical camera are consistent, and the positions are offset from left to right. Move a certain distance to simulate the interpupillary distance of the human eye. The rendering camera sets the corresponding rendering viewports, where the height of the rendering viewport is the height of the screen, and the width is half the width of the screen. The two viewports are combined to cover the entire rendering screen. When the virtual VR mode is turned off, the rendering camera is removed, and the logical camera is switched to the only rendering camera, which renders normally on the screen.

In this embodiment, the vector tile data corresponding to the three-tone ground pattern is obtained first. In order to speed up the data processing efficiency, the vector tile data can be processed to obtain a plurality of initial geometric figures, and then each initial geometric figure can be obtained. Corresponding geographic types, and color rendering the corresponding initial geometric figures according to the geographic types to obtain multiple geographic patches that are easy to distinguish geographic types, then combine the geographic patches to obtain a two-dimensional texture map, and finally according to The two-dimensional texture map determines the target ground pattern, and stretches the target ground pattern. While improving work efficiency, it can generate a three-dimensional ground pattern with strong three-dimensional sense and support for virtual VR display. image.

In addition, referring to FIG. 4 , FIG. 4 shows the first embodiment of the above-mentioned method for obtaining a stereoscopic image of a three-tone ground pattern supporting virtual VR, and a second implementation of the method for obtaining a three-tone ground pattern stereoscopic image supporting virtual VR according to the present invention is proposed. example.

In the second embodiment, the step S50 described in the method for obtaining a stereoscopic image of a three-tone ground pattern that supports virtual VR further includes:

Step S501: Acquire a reference vertex pixel coordinate set of the target ground type patch.

The geographic type is used as a key object, and a target style identifier corresponding to the key object is obtained according to a preset key-value pair, and a target land type patch is determined according to the target style identifier and the two-dimensional texture map.

Pre-store the geographic types and style identifiers corresponding to the initial geometric figures in the database, and make a one-to-one correspondence between geographic types and style identifiers in the form of key-value pairs, that is, each geographic type has a corresponding style identifier. Assuming that the initial geometric figure is a triangle, the corresponding geographic type is mountain, and the corresponding style identifier is 1. If the initial geometric figure is a rectangle, the corresponding geographic type is water, and the corresponding style identifier is 2, etc.

The way to determine the target ground type patch according to the two-dimensional texture map can be based on the style identifier or the color. If the user selects the target ground type patch with the style identifier of 1, it corresponds to a triangle. If the user selects yellow, the initial geometric figure with yellow, that is, the terrain patch, will be used as the target terrain patch, etc.

The vector tile block data coordinates are a set of pixel coordinates with the upper left corner of the tile as the origin, that is, a set of vertex pixel coordinates in a preset orientation, as shown in FIG. 2 . 2 is a scatter diagram of preset orientation pixel coordinates according to the first embodiment of the method for obtaining a three-tone ground-type stereoscopic image for virtual VR in accordance with the present invention. In the 3D scene, it needs to be drawn with a depth of field effect, so it needs to be converted to real geographic coordinates. Wherein, the coordinate conversion method may be, through the layer row and column number of the vector tile block, calculate the latitude and longitude corresponding to the east, west, north and south of the vector tile block through the first preset formula, and then according to the pixel coordinates of each vertex in the vector tile block , the latitude and longitude coordinates of each vertex can be obtained by interpolation, and then the latitude and longitude coordinates are converted into space rectangular coordinates according to the second preset formula, so that the space rectangular coordinates are used for three-dimensional scene rendering. That is, coordinate transformation is performed on the vertex pixel coordinate set of the first preset orientation to obtain a spatial rectangular coordinate set, and a normal coordinate set corresponding to each initial geometric figure is obtained according to the spatial rectangular coordinate set.

That is to say, the step of obtaining the normal coordinate set corresponding to the target ground type patch according to the vertex pixel coordinate set is to perform coordinate transformation on the vertex pixel coordinate set to obtain a space rectangular coordinate set, and according to the space The rectangular coordinate set obtains the normal coordinate set corresponding to the target ground type patch.

Referring to FIG. 3 , FIG. 3 is a side view of the hollow figure area of the first embodiment of the method for obtaining a stereoscopic image of three-tone ground-type spots supporting virtual VR according to the present invention, and the reference vertex pixel coordinate set is B0, B1, B2, B3, B4, B5, B6, that is to say, the target ground type patch is a two-dimensional patch, and the reference vertex pixel coordinate set also refers to the corresponding polygon vertex pixel coordinates in the target ground type patch.

Step S502 : longitudinally stretching the target terrain patch according to a preset coordinate height threshold to obtain a stretched target terrain patch.

The target terrain patch is stretched according to the preset coordinate height threshold, that is to say, for the polygons corresponding to different terrain patches in the same vector tile block, the non-elevation values of the vertices are set respectively, so that different Terrain patches can be staggered. Since only the elevation value is modified, the patch polygons are always kept in the same plane, so the normal information does not need to be adjusted, which can reduce the amount of calculation and improve the work efficiency. Finally, after the stretching is completed, the stretched target ground pattern patches are obtained.

Step S503: Acquire a set of stretched vertex coordinates corresponding to the stretched target ground pattern.

Further, referring to FIG. 3 , the stretched vertex coordinate sets are T0, T1, T2, T3, T4, T5 and T6, that is to say, the stretched target terrain patch has changed the elevation of the vertices. value, according to the coordinates B0, B1, B2, B3, B4, B5 and B6 to obtain the stretched vertex coordinate values T0, T1, T2, T3, T4, T5 and T6 corresponding to the stretched target terrain patch.

The stretched target ground type patch and the target ground type patch are the same type of patch, but the height position has changed.

Step S504: Generate a three-tone ground-type patch stereo image according to the reference vertex coordinate set and the stretched vertex coordinate set.

Set the reference vertex coordinates and the stretch vertex coordinates, that is, the coordinates B0, B1, B2, B3, B4, B5 and B6 and the coordinates T0, T1, T2, T3, T4, T5 and T6 in turn. Corresponding connections are made to obtain the side hole figure area, and then the side hole figure is generated by the Delaunay triangle network construction algorithm to generate multiple triangle nets, or it can be a coordinate cross connection, B0 is connected with T0 and T1 respectively, B1 is connected with T1 and T1 and T2 is connected, B2 is connected with T2 and T3 respectively, B3 is connected with T3 and T4, B4 is connected with T4 and T5 respectively, B5 is connected with T5 and T6 respectively, and B6 is connected with T6, and then according to the obtained triangular network forming a basic graphics drawing unit corresponding to the side cavity graphic area, and finally performing color rendering on the side hollow graphic area according to the style configuration file corresponding to the side hollow graphic area and the basic graphics drawing unit to obtain a side texture map, the side hollow graphic area corresponding to In order to make the three-dimensional image more stereoscopic, finally, according to the stretched target ground pattern and the side texture map, a three-tone ground pattern three-dimensional image is generated.

In this embodiment, first obtain the reference vertex coordinate set of the target ground pattern, and then in order to improve work efficiency, the target ground pattern is stretched according to a preset coordinate height threshold to obtain the stretched The target ground class map spot, and the stretched vertex coordinate set corresponding to the stretched target ground class map spot is obtained, and finally the target ground class map is generated according to the reference vertex coordinate set and the stretched vertex coordinate set. The patch is stretched to generate a three-tone ground-type patch stereo image with a strong three-dimensional sense.

In addition, referring to FIG. 5 , FIG. 5 is a structural block diagram of a first embodiment of an apparatus for obtaining a stereoscopic image of three-tone ground-type spots that supports virtual VR according to the present invention. As shown in FIG. 5 , an apparatus for obtaining a stereoscopic image of a three-tone ground patch that supports virtual VR according to an embodiment of the present invention includes: an acquisition module 5001, configured to acquire vector tile block data corresponding to the three-tone ground patch, and to The vector tile data is processed to obtain an initial geometric image, and the initial geometric image includes a plurality of initial geometric figures; the obtaining module 5001 is further configured to obtain the geographic type corresponding to each initial geometric figure; the rendering module 5002, It is used to perform color rendering on the corresponding initial geometric figures according to the geographic type respectively, and obtain a plurality of terrain patches; the combining module 5003 is used to combine the terrain patches to obtain a two-dimensional texture map; the generating module 5004, for determining a target ground patch according to the two-dimensional texture map, and stretching the target ground patch to generate a three-tone ground patch stereo image.

The obtaining module 5001 is configured to obtain the vector tile data corresponding to the three-tone ground pattern, and process the vector tile data to obtain an initial geometric image, where the initial geometric image includes a plurality of initial geometric figures.

It should be noted that the execution body of this embodiment is a three-tone ground-type patch stereo image acquisition device that supports virtual VR, wherein the device is a virtual VR that supports functions such as image processing, data processing, network communication, and program running. The device for obtaining the stereoscopic image of the three-tone ground pattern spot can also be other devices, which is not limited in this embodiment.

Among them, "the third national land survey" is abbreviated as "three surveys". One of the results of the three surveys is the land classification data, that is, the land classification map. That is to say, the land classification data of the third national land survey is called the land classification data. The three-tone earth pattern pattern is then obtained according to the three-tone earth pattern pattern, and the three-tone earth pattern pattern data is stored in the database in the form of vector data.

In order to speed up the display efficiency of data, these vector data are cut into blocks according to certain rules to form vector tiles. It can be understood that, according to the camera frustum in the 3D scene to obtain the current required vector tile coverage, calculate the required vector tile block row and column number according to the vector tile coverage, and obtain the corresponding vector tile block , and then request the corresponding vector tile block data from the database through the data service, and save it to the system for caching.

In addition, the vector tile data is converted into spatial data, the spatial data includes point data, line data and area data, and then the point data, line data and area data are combined to obtain an initial geometric image, that is , the vector tile data is stored in the database in the form of json_encode, and the client needs to parse the json_encode data after loading, convert the string into the memory organization of points, lines and surfaces, and then combine the points, lines and surfaces to An initial geometric image is obtained, where the initial geometric image includes a plurality of initial geometric figures.

The obtaining module 5001 is further configured to obtain the geographic type corresponding to each initial geometric figure.

The geographic types corresponding to each initial geometric figure may be the same or different. Assuming that the initial geometric image includes multiple initial geometric figures, the initial geometric figures are triangles, diamonds, rectangles, etc. If it is set to mountain, the geographic type corresponding to the diamond can be set to land, or the geographic type corresponding to the rectangle can be set to river, etc. In this scheme, the geographic type corresponding to the triangle can also be set to mountain, or the geographic type corresponding to the diamond can be set to For mountains, etc., this solution can also pre-set the geographic type corresponding to the initial geometric figure in the database, and match the initial geometric figure in the database to obtain the corresponding geographic type, which is not limited in this embodiment.

The rendering module 5002 is configured to perform color rendering on the corresponding initial geometric figures according to the geographic types, respectively, to obtain a plurality of geographic patches.

Find the style configuration file corresponding to the geographic type respectively, then obtain the triangulation corresponding to each initial geometric figure through the triangulation network construction algorithm, and then generate the basic graphics drawing unit according to the triangular net, and finally, according to the style configuration file and the basic graphics drawing unit, the corresponding initial Geometry is color-rendered to obtain multiple terrain patches.

That is to say, the three-tone ground pattern is expressed in the form of polygons, and the parsed vector tile data of the vector tiles is stored in the initial geometric figures generated by points, lines and surfaces. These initial geometric figures cannot be Color rendering is performed directly through the 3D Application Programming Interface API. Therefore, it is necessary to generate the corresponding triangular network for each initial geometric figure through the Delaunay triangulation network construction algorithm, and then form the corresponding triangular network according to the triangular network. Basic graphics drawing unit for 3D drawing API calls for color rendering.

It can be understood that, assuming that the initial geometric figure is a rectangle, a triangle network is generated from the rectangle through the Delaunay triangle network construction algorithm, and the triangle network corresponds to two triangles, and then the basic graphics drawing unit corresponding to the rectangle is formed according to the obtained triangle network. The initial geometric figure is a triangle, and a triangular net is generated from the triangle through the Delaunay triangular net construction algorithm, and then a basic figure drawing unit corresponding to the triangle is formed according to the obtained triangular net, which is not limited in this embodiment.

The geographic types corresponding to the initial geometric figures all have corresponding style identifiers, and the style identifiers have corresponding style configuration files. The style configuration files are user-defined settings, which may include colors, symbols, and transparency that need to be rendered.

The geographic type corresponding to the initial geometric figure is used as the key object, and then the style identifier corresponding to the key object is obtained according to a preset key-value pair, where the preset key-value pair includes a geographic type and a style identifier, and the geographic type and style identifier The corresponding relationship is stored in the database in the form of key-value pairs in advance for subsequent retrieval and use. Assuming that the geographic type corresponding to the initial geometric figure is mountain and the corresponding style identifier is 1, the style configuration file corresponding to the value 1 is obtained. That is to say, each geographic type has a corresponding style configuration file, that is, the rendering color and transparency corresponding to the mountain. It can also be assumed that the geographic type corresponding to the initial geometric figure is water, and the corresponding style identifier is 1, then Configuration information such as rendering colors corresponding to water is selected from a style configuration file (the style configuration file contains configuration information corresponding to various geographic types) according to the style identifier, which is not limited in this embodiment.

The combining module 5003 is used for combining the ground type patches to obtain a two-dimensional texture map.

The ground-type patch is the initial geometric figure that has been rendered in color. The initial geometric figures after color rendering are combined graphically to obtain the initial geometric image with color, and then the initial geometric image with color is called two-dimensional. texture map.

Assuming that the initial geometric image includes triangles, rectangles and rhombus, triangles, rectangles and rhombus are all colorless shapes, and then the triangles are rendered in yellow to form yellow triangles, and the rectangles are rendered in blue to generate blue rectangles, and the rhombus is rendered as red to generate a red rhombus, and then graphically combine the yellow triangle, the blue rectangle, and the red rhombus to obtain a two-dimensional texture map, which is the final complete land-type patch image.

A generating module 5004 is configured to determine a target ground patch according to the two-dimensional texture map, and stretch the target ground patch to generate a three-tone ground patch stereo image.

The geographic type is used as a key object, and a target style identifier corresponding to the key object is obtained according to a preset key-value pair, and a target land type patch is determined according to the target style identifier and the two-dimensional texture map.

Pre-store the geographic types and style identifiers corresponding to the initial geometric figures in the database, and make a one-to-one correspondence between geographic types and style identifiers in the form of key-value pairs, that is, each geographic type has a corresponding style identifier. Assuming that the initial geometric figure is a triangle, the corresponding geographic type is mountain, and the corresponding style identifier is 1. If the initial geometric figure is a rectangle, the corresponding geographic type is water, and the corresponding style identifier is 2, etc.

The way to determine the target ground type patch according to the two-dimensional texture map can be based on the style identifier or the color. If the user selects the target ground type patch with the style identifier of 1, it corresponds to a triangle. If the user selects yellow, the initial geometric figure with yellow, that is, the terrain patch, will be used as the target terrain patch, etc.

Acquire the vertex pixel coordinate set of the preset orientation corresponding to each initial geometric figure according to the vector tile data, and obtain the normal coordinate set corresponding to the target ground type patch according to the vertex pixel coordinate set, and obtain the The reference vertex coordinate set of the target terrain patch, and the target terrain patch is stretched according to the preset coordinate height threshold, that is, the polygons corresponding to different terrain patches in the same vector tile block are stretched. , respectively set the non-elevation values of the vertices, so that the different types of patches can be staggered. Because only the elevation value is modified, the polygon of the patch is always kept in the same plane, so the normal information does not need to be adjusted, which can reduce the amount of calculation and improve the work efficiency. The stretched vertex coordinate set of the target ground pattern spot after being stretched, and a three-tone ground pattern three-dimensional image is generated according to the reference vertex coordinate set and the stretched vertex coordinate set.

Further, the step of obtaining the normal coordinate set corresponding to each initial geometric figure according to the vertex pixel coordinate set of the first preset orientation includes: the vector tile block data coordinate is a pixel whose origin is the upper left corner of the tile. The coordinate set is the vertex pixel coordinate set of the preset orientation, as shown in FIG. 2 . 2 is a scatter diagram of a set of preset orientation pixel coordinates according to the first embodiment of the method for obtaining a stereoscopic image of three-tone ground-type spots supporting virtual VR according to the present invention, wherein the preset orientation pixel coordinate set can only satisfy the requirements of a two-dimensional base. It is used for drawing in the figure. In the three-dimensional scene, it needs to be drawn with a depth of field effect, so it needs to be converted into real geographic coordinates. Wherein, the coordinate conversion method may be, through the layer row and column number of the vector tile block, calculate the latitude and longitude corresponding to the east, west, north and south of the vector tile block through the first preset formula, and then according to the pixel coordinates of each vertex in the vector tile block , the latitude and longitude coordinates of each vertex can be obtained by interpolation, and then the latitude and longitude coordinates are converted into space rectangular coordinates according to the second preset formula, so that the space rectangular coordinates are used for three-dimensional scene rendering. That is, coordinate transformation is performed on the vertex pixel coordinate set of the first preset orientation to obtain a spatial rectangular coordinate set, and a normal coordinate set corresponding to each initial geometric figure is obtained according to the spatial rectangular coordinate set.

The first preset formula is:

In the formula, L is the level of the vector tile, Col is the column number of the vector tile, Row is the row number of the vector tile, TileSize is the longitude and latitude, West is the west longitude, East is the east longitude, South is the south latitude, North is the northern latitude.

The second preset formula is:

In the formula, Latitude Degree is the latitude coordinate, Longitude Degree is the longitude coordinate, x, y, z are Cartesian space Cartesian coordinates, radCosLat is the defined intermediate variable, and radius is the radius of the earth (value 6378137).

The step of obtaining the normal coordinate set corresponding to the target ground type patch according to the vertex pixel coordinate set is as follows: performing coordinate transformation on the vertex pixel coordinate set to obtain a space rectangular coordinate set, and obtaining a space rectangular coordinate set according to the spatial rectangular coordinate set. The set of normal coordinates corresponding to the target ground type patches.

In order to make the solid-color vector tiles have a three-dimensional sense in the three-dimensional scene, it is necessary to add lighting information, and the brightness and shade changes formed by the ups and downs of the terrain make the three-dimensional sense stronger. The premise of using lighting is that vertices need to have normal information. First, calculate the surface normal information of each triangle. The calculation method is to select two sides of the triangle to construct a direction vector, and perform the cross product of these two vectors to obtain the surface normal of the surface. Second, assign the value of the surface normal of the triangle. For each vertex of the triangle, a vertex may be shared by multiple triangles, then the normal of the vertex is recorded as the cumulative value of the normals of all shared triangle faces, and finally, the cumulative normal value of the vertex is normalized, Converted to a unit normal vector and passed to the GPU for use in lighting calculations.

Referring to FIG. 3 , said FIG. 3 is a side hole graphic area diagram of the first embodiment of the three-tone ground-type stereo image acquisition method supporting virtual VR of the present invention, and then color rendering is performed on the side side hole graphic area to obtain a side view A texture map, generating a three-tone three-dimensional image of the terrain patch according to the stretched target terrain patch and the side texture map.

Color rendering is performed on the side cavity graphic area, and the step of obtaining the side texture map is to generate a plurality of triangular nets from the rectangle through the Delaunay triangulation network construction algorithm, and then form the basis corresponding to the side cavity graphic area according to the obtained triangular net. The graphics drawing unit finally performs color rendering on the side hollow graphic area according to the style configuration file corresponding to the side hollow graphic area and the basic graphics drawing unit to obtain a side texture map, and the color in the style configuration file corresponding to the side hollow graphic area is To make the three-dimensional image more three-dimensional, it can be set to gray, etc., which is not limited in this embodiment.

In this solution, a stepped three-dimensional triangular mesh can also be generated from different terrain patterns in each tile block, and the top and side surfaces need to be mapped separately. In order to speed up the rendering efficiency, an integrated map can be used. Specifically, in the process described in the above embodiment, according to a grid texture that has been generated by rendering, the texture can be mapped as a whole to the undulating triangle mesh to complete the mapping. The specific mapping relationship needs to be calculated for each The texture coordinates of the vertex. That is to say, the reserved pixel coordinate value with the upper left corner of the tile as the origin, divided by the size of the vector tile, to get the normalized coordinates, and the changed coordinates are used as the texture coordinates of the vertex to complete the texture coordinates and triangle. The mapping of the network, and then through the filter condition setting, can achieve the elevation of different types of patches to different heights, but the sudden elevation is abrupt. Therefore, the height value set by the filter condition and the current height value of the terrain patch can be directly interpolated, and the height value can be adjusted in each frame of rendering to approach the set target value, so as to achieve the animation effect of height rising or falling. Makes the terrain patch have a lifting animation process, making the interaction smoother.

In addition, after the step of determining the target ground pattern according to the two-dimensional texture map, and stretching the target ground pattern to generate a three-tone ground pattern three-dimensional image, obtain the corresponding ground pattern of the logical camera. position information and a three-tone ground-like patch stereo image, determine the position distance of the rendering camera group according to the position information, the rendering camera group includes a first rendering camera and a second rendering camera, and set the said position and distance respectively according to the position distance The first rendering viewport corresponding to the first rendering camera and the second rendering viewport corresponding to the second rendering camera, the first rendering viewport and the second rendering viewport are used as the target rendering viewport, that is It is said that a virtual VR display is performed on the stereoscopic image of the three-tone ground-type patch through the target rendering viewport. The specific implementation manner of this embodiment can complete the normal rendering operation in the 3D scene, but in order to support the virtual VR display, in addition, the rendering capability of supporting stereo image pairs needs to be extended. Therefore, three cameras, one logical camera and two rendering cameras, can be set up in the 3D scene. In the virtual VR display mode, the application can only control the logical camera, and the 3D interaction and animation process in the above steps are only linked to the logical camera; the orientation of the two rendering cameras and the logical camera are consistent, and the positions are offset from left to right. Move a certain distance to simulate the interpupillary distance of the human eye. The rendering camera sets the corresponding rendering viewports, where the height of the rendering viewport is the height of the screen, and the width is half the width of the screen. The two viewports are combined to cover the entire rendering screen. When the virtual VR mode is turned off, the rendering camera is removed, and the logical camera is switched to the only rendering camera, which renders normally on the screen.

In this embodiment, the vector tile data corresponding to the three-tone ground pattern is obtained first. In order to speed up the data processing efficiency, the vector tile data can be processed to obtain a plurality of initial geometric figures, and then each initial geometric figure can be obtained. Corresponding geographic types, and color rendering the corresponding initial geometric figures according to the geographic types to obtain multiple geographic patches that are easy to distinguish geographic types, then combine the geographic patches to obtain a two-dimensional texture map, and finally according to The two-dimensional texture map determines the target ground pattern, and stretches the target ground pattern. While improving work efficiency, it can generate a three-dimensional ground pattern with strong three-dimensional sense and support for virtual VR display. image.

For other embodiments or specific implementation manners of the apparatus for obtaining a stereoscopic image of three-tone ground-like patches supporting virtual VR according to the present invention, reference may be made to the above method embodiments, which will not be repeated here.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or system comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or system. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system that includes the element.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages or disadvantages of the embodiments. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order and may be interpreted as names.

From the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course hardware can also be used, but in many cases the former is better implementation. Based on this understanding, the technical solutions of the present invention essentially or the parts that contribute to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as a read-only memory image). Memory image, ROM)/random access memory (Random Access Memory, RAM, disk, CD), including several instructions to make a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc. ) to execute the methods described in the various embodiments of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields , are similarly included in the scope of patent protection of the present invention.

Claims (8)

1. A method for obtaining a stereoscopic image of three-tone ground-type spots supporting virtual VR, wherein the method comprises the following steps: Obtaining vector tile data corresponding to the three-tone ground pattern, and processing the vector tile data to obtain an initial geometric image, where the initial geometric image includes a plurality of initial geometric figures; Get the geographic type corresponding to each initial geometry; Color rendering is performed on the corresponding initial geometric figures according to the geographic types, respectively, to obtain a plurality of geographic map spots; combining the ground pattern patches to obtain a two-dimensional texture map; The target ground pattern is determined according to the two-dimensional texture map, and the target ground pattern is stretched to generate a three-tone ground pattern three-dimensional image. 2. The method of claim 1, wherein the step of processing the vector tile data to obtain an initial geometric image comprises: converting the vector tile data into spatial data, the spatial data including point data, line data and area data; An initial geometric image is generated from the point data, the line data and the area data. 3. The method according to claim 1, wherein the step of performing color rendering on the corresponding initial geometric figures according to the geographical type respectively to obtain a plurality of geographical map spots, comprises: Obtain the triangulation corresponding to each initial geometric figure through the triangulation construction algorithm; generating a basic graphics drawing unit according to the triangulation; Find the style configuration files corresponding to the geographic types respectively; According to the style configuration file, color rendering is performed on the initial geometric figure by the basic figure drawing unit to obtain a plurality of terrain patches. 4. The method according to claim 1, wherein the step of determining the target terrain pattern according to the two-dimensional texture map comprises: The geographic type is used as a key object to search for a corresponding target style identifier in a preset key-value pair, and the key-value pair stores the correspondence between the geographic type and the style identifier; Determine the target ground type patch according to the target style identifier and the two-dimensional texture map. 5 . The method of claim 1 , wherein the step of stretching the target ground pattern to generate a three-tone ground pattern three-dimensional image comprises: 5 . Obtain the reference vertex coordinate set of the target ground pattern; According to the preset coordinate height threshold, longitudinally stretch the target terrain patch to obtain the stretched target terrain patch; Obtain the stretched vertex coordinate set corresponding to the stretched target ground pattern; A three-tone ground-like patch stereo image is generated according to the reference vertex coordinate set and the stretched vertex coordinate set. 6. The method according to claim 5, wherein the step of generating a three-tone ground-type patch stereo image according to the reference vertex coordinate set and the stretched vertex coordinate set comprises: Constructing a side hollow figure area according to the reference vertex coordinate set and the stretch vertex coordinate set; performing color rendering on the side cavity graphic area to obtain a side texture map; According to the stretched target terrain patch and the side texture map, a three-tone terrain patch stereo image is generated. 7 . The method according to claim 1 , wherein the target ground pattern is determined according to the two-dimensional texture map, and the target ground pattern is stretched to generate a three-tone ground pattern. 8 . After the step of spotting the stereoscopic image, the method further includes: Obtain the position information corresponding to the logical camera and the stereo image of the three-tone ground pattern; Determine the position distance of the rendering camera group according to the position information, the rendering camera group includes a first rendering camera and a second rendering camera; respectively setting a first rendering viewport corresponding to the first rendering camera and a second rendering viewport corresponding to the second rendering camera according to the position distance; using the first rendering viewport and the second rendering viewport as target rendering viewports; A virtual VR display is performed on the three-tone ground-like patch stereoscopic image through the target rendering viewport. 8. A device for obtaining a stereoscopic image of a three-tone ground-type spot that supports virtual VR, wherein the device for obtaining a three-tone ground-type spot stereoscopic image supporting virtual VR comprises: an acquisition module, configured to acquire vector tile data corresponding to the three-tone ground pattern, and process the vector tile data to obtain an initial geometric image, where the initial geometric image includes a plurality of initial geometric figures; The obtaining module is also used to obtain the geographic type corresponding to each initial geometric figure; a rendering module, configured to perform color rendering on the corresponding initial geometric figures according to the geographic types, respectively, to obtain a plurality of geographic map spots; a combination module, used for combining the ground pattern patches to obtain a two-dimensional texture map; The generating module is configured to determine the target ground pattern according to the two-dimensional texture map, and stretch the target ground pattern to generate a three-tone ground pattern three-dimensional image.

Images