CN109191557A - The image texture mapping method and device of relief map - Google Patents
The image texture mapping method and device of relief map Download PDFInfo
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Abstract
The present invention provides the image texture mapping methods and device of a kind of relief map, wherein this method comprises: according to the digital complex demodulation data of relief map and with the digital orthophoto map DOM data of the relief map isospace range, the dem data is drawn high；According to the dem data after drawing high, multiple inclination triangular facets are constructed；Determine data texturing corresponding in each inclination triangular facet；It is mapped on the relief map according to the spatial position of dem data pixel and the data texturing using DOM data as texture.Three-dimensional landform image texture can be more subtly mapped on the solid landform by the present invention, the defect for overcoming the texture mapping of Local terrain changes large area to deform, finer relief map is produced convenient for production, is of great significance for presenting and expressing topography and geomorphology minutia.
Description
Technical field
The present invention relates to spatial information field more particularly to the image texture mapping methods and dress of a kind of relief map
It sets.
Background technique
Currently, relief map is the ground for directly or indirectly indicating surface three-dimensional topography and geomorphology form in the form of 3 D stereo
Figure.By taking the moon as an example, in order to preferably protrude the up-and-down pattern of moonscape, the vertical scale of moon relief map
Several times usually bigger than horizontal scale, show three dimension realistic, have the characteristics that intuitive is strong.Moon relief map can be with
Data decision support is provided for moon pattern tectonic cycle period, the planning of moon exploration task path, is visited in scientific lunar exploration, engineering
Using very extensive in survey.Therefore, high-precision moon relief map is made with important science and engineering value.
The moon relief map of early stage uses indirect stereo display method more, by using existing relief shading
Method, illuminated contour method, perspective describe the scenery method, birds-eye view method, blocky perspective view method, statistics perspective view method etc. on plane map
Map subject indirectly generates stereoscopic effect.And nearest moon relief map, then it is mainly to utilize DEM digital elevation mould
Type data directly show that the three-dimensional of menology landform rises and falls, while using the moon DOM image of same position range as texture,
Corresponding image texture is found based on pixel position, dimensional topography surface is mapped to one by one, to more truly show menology
Three-dimensional appearance.What is showed due to the dimensional topography of dem data expression is three-dimensional configuration that height rises and falls, and DOM data are general
It is rendered as the Two-dimensional morphology of plane, traditional relief map drafting method often has ignored between pixel and deposits in texture mapping
Inclined surface, the mapping of texture is directly controlled by drawing high for DOM pixel itself, in this way on certain ground changed greatly
Shape region is easy to appear texture and draws high deformation or crack occur.When making high-resolution moon relief map, due to
On vertical scale (elevation direction) to draw high ratio usually more much larger than horizontal scale (4 times or so), thus more
Increase the surface on the inclined direction of landform；If the texture that the surface mapping of these inclined directions arrives will without processing
It will appear more serious deformation or crack, influence the expression of menology solid landform.
Summary of the invention
(1) technical problems to be solved
It is above-mentioned to solve the purpose of the present invention is to provide the image texture mapping method and device of a kind of relief map
At least one of technical problem.
(2) technical solution
The one side of the embodiment of the present invention provides a kind of image texture mapping method of relief map, comprising:
Number according to the digital complex demodulation data of relief map and with the relief map isospace range
Word orthophotoquad DOM data, draw high the dem data；
According to the dem data after drawing high, multiple inclination triangular facets are constructed；
Determine data texturing corresponding in each inclination triangular facet；
Institute is mapped to using DOM data as texture according to the spatial position of dem data pixel and the data texturing
It states on relief map.
In some embodiments of the invention, the dem data is drawn high, is specifically included:
According to the requirement that the relief map charts, determine vertical direction scale bar draws high coefficient N, thus to described
Dem data is drawn high.
In some embodiments of the invention, multiple inclination triangular facets are constructed, are specifically included:
By pixel inclined direction surface developing algorithm, centered on pixel, 8 by pixel are constructed with eight neighborhood range
Tilt triangular facet.
In some embodiments of the invention, it determines data texturing corresponding in each inclination triangular facet, specifically includes:
Institute in each inclination triangular facet is successively calculated in clockwise direction based on weighting reconciliation texture-mapping algorithm
Corresponding data texturing.
In some embodiments of the invention, by pixel inclined direction surface developing algorithm, centered on pixel, with eight
Contiguous range by pixel constructs 8 inclination triangular facets, specifically includes:
Dem data pixel is traversed, pixel center and pixel eight neighborhood center are connected, along clockwise direction, connection eight
A centre of neighbourhood, so that connection obtains nine particles and using it as 8 triangular facets on vertex, building obtains the inclined direction of pixel
All surface, i.e. inclination triangular facet.
In some embodiments of the invention, it after constructing 8 inclination triangular facets, further comprises the steps of: and calculates each inclination three
The ratio of edged surface area and unit pixel area, and it is rounded determining integer ratios K, and K meets formula: K=[S1/(0.5*S2)],
Wherein, S1For sloped triangular shape area, S2For unit pixel area.
In some embodiments of the invention, based on weighting reconciliation texture-mapping algorithm, in clockwise direction, successively
Data texturing corresponding in each inclination triangular facet is calculated, is specifically included:
The each pixel of the dem data and its field pixel are traversed, each pixel is found in DOM data according to plane coordinates
Corresponding texture pixel；
Build on dem data 8 inclination triangular facets are respectively corresponded into 8 plane trigonometry faces in DOM data,
K point is inserted into the inclination triangular facet after drawing high；
The plane coordinates and elevation for calculating sloped triangular shape interpolation points, if the inclined-plane Atria picture on dem data
Member is P1、P2And P3, acquirement interpolation point is P0, the texture pixel of corresponding 3 DOM data is Q1、Q2And Q3If P0Point and inclination
The distance a, b, c on each vertex of triangle, the inclination alpha of sloped triangular shape calculate its texture value Q taken in DOM data0, Q0Meter
Calculate formula are as follows:
Q0=(a/ (a+b+c) * Q1+b/(a+b+c)*Q2+c/(a+b+c)*Q3)*cosα。
In some embodiments of the invention, the point sampling method of the K point is the interior angle bisection along inclination triangular facet
Line, the point is the inner interweaver intersection point of the inclination triangular facet when K=1, and when K > 1, multiple points are the interior angle of the inclination triangular facet
The point determined between bisector intersection point and triangular apex according to ratio value.
It in some embodiments of the invention, will according to the spatial position of dem data pixel and the data texturing
DOM data are mapped on the relief map as texture, comprising steps of
It is three-dimensional according to its corresponding DEM by the corresponding data texturing of the central point of the data texturing and each dem data
Surface is mapped on entire relief map three-dimensional surface, forms the relief map for being mapped with texture information.
The another aspect of the embodiment of the present invention additionally provides a kind of image texture mapping device of relief map, wherein
It is stored with executable instruction, and the executable instruction when executed by one or more processors, makes one or more of
Processor executes following operation:
Number according to the digital complex demodulation data of relief map and with the relief map isospace range
Word orthophotoquad DOM data, draw high the dem data；
According to the dem data after drawing high, multiple inclination triangular facets are constructed；
Determine data texturing corresponding in each inclination triangular facet；
Institute is mapped to using DOM data as texture according to the spatial position of dem data pixel and the data texturing
It states on relief map.
(3) beneficial effect
The image texture mapping method and device of relief map of the invention, compared to the prior art, at least have with
Lower advantage:
1, after being drawn high by calculating vertical direction, inclined direction surface situation of change utilizes weighting reconciliation mapping method weight
The new texture for calculating inclined direction, optimizes processing to texture mapping, so that image texture mapping is finer, has taken into account
The texture mapping in inclined direction face when vertically drawing high can overcome the problems, such as image texture mapping stretcher strain and rupture；
2, moon relief map image can be improved in the method that two-dimentional DOM image is mapped to three-dimensional DEM topographical surface
The quality and precision of texture mapping, for making higher resolution, being more nearly true relief map, convenient for production production
Finer relief map out is of great significance for presenting and expressing solid landform landscape details feature.
Detailed description of the invention
Fig. 1 is the step schematic diagram of the image texture mapping method of the relief map of the embodiment of the present invention；
Fig. 2A is the three-dimensional terrain data of the dem data of 1.5m resolution ratio；
Fig. 2 B is the flat image data texturing of the DOM data for the 1.5m resolution ratio that Fig. 2A corresponds to range
Fig. 2 C is that plane DOM texture is directly corresponded the line for mapping directly to three-dimensional topographical surface and being formed by pixel
Reason maps three-dimensional landform effect picture；
Fig. 3 A to Fig. 3 C is that pixel inclined direction surface constructs schematic diagram.
Fig. 4 is the schematic diagram of the inclined surface triangle of composition using three pixels as endpoint；
Fig. 5 is based on the three-dimensional landform effect picture that progress texture mapping obtains after present invention processing.
Specific embodiment
(elevation direction) draws high usually more much larger than horizontal scale (4 times of ratio on vertical scale in the prior art
Left and right), thus more increase the surface on the inclined direction of landform；If without processing, the table of these inclined directions
The texture that face is mapped to will will appear more serious deformation or crack, influence the expression of three-dimensional landform.In view of this, this
Invention provides the image texture mapping method and device of a kind of relief map, is retaining original pixel position textural characteristics
Simultaneously, moreover it is possible to respect to, due to the texture mapping for the inclined surface that vertical direction is drawn high and is generated, realization is higher between pixel
The texture mapping of the three-dimensional landform (such as the moon or other celestial bodies) of precision, obtains more true relief map.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
The one side of the embodiment of the present invention provides a kind of image texture mapping method of relief map, as shown in Figure 1,
This method comprises:
S1, according to the digital complex demodulation data of relief map and with the relief map isospace range
Digital orthophoto map DOM data, draw high the dem data.
S2, according to the dem data after drawing high, construct multiple inclination triangular facets；
S3, data texturing corresponding in each inclination triangular facet is determined；
S4, it is mapped to according to the spatial position and the data texturing of dem data pixel using DOM data as texture
On the relief map.
In step S1, the dem data is drawn high, is specifically included:
According to the requirement that the relief map charts, determine vertical direction scale bar draws high coefficient N, thus to described
Dem data is drawn high.
In step S2, multiple inclination triangular facets are constructed, are specifically included:
By pixel inclined direction surface developing algorithm, centered on pixel, 8 by pixel are constructed with eight neighborhood range
Tilt triangular facet.More specifically, dem data pixel can be traversed first, pixel center and pixel eight neighborhood center are connected, then edge
Clockwise direction, connect eight centres of neighbourhood, so that connection obtains nine particles and using it as 8 triangular facets on vertex,
Building obtains the inclined direction all surface of pixel, i.e. inclination triangular facet.
After constructing 8 inclination triangular facets, further comprises the steps of: and calculate each inclination triangular facet area and unit pixel area
Ratio, and be rounded determining integer ratios K, and K meets formula: K=[S1/(0.5*S2)], wherein S1For sloped triangular shape face
Product, S2For unit pixel area, a little prepare for taking in step S3.
In step S3, determines data texturing corresponding in each inclination triangular facet, specifically includes:
Institute in each inclination triangular facet is successively calculated in clockwise direction based on weighting reconciliation texture-mapping algorithm
Corresponding data texturing, specifically includes:
The each pixel of the dem data and its field pixel are traversed, each pixel is found in DOM data according to plane coordinates
Corresponding texture pixel；
Build on dem data 8 inclination triangular facets are respectively corresponded into 8 plane trigonometry faces in DOM data,
K point is inserted into the inclination triangular facet after drawing high；
The plane coordinates and elevation for calculating sloped triangular shape interpolation points, if the inclined-plane Atria picture on dem data
Member is P1、P2And P3, acquirement interpolation point is P0, the texture pixel of corresponding 3 DOM data is Q1、Q2And Q3If P0Point and inclination
The distance a, b, c on each vertex of triangle, the inclination alpha of sloped triangular shape calculate its texture value Q taken in DOM datao, Q0Meter
Calculate formula are as follows:
Q0=(a/ (a+b+c) * Q1+b/(a+b+c)*Q2+c/(a+b+c)*Q3)*Cosα。
The point sampling method of K point therein is the inner interweaver along sloped triangular shape, and the point is the inclination when K=1
The inner interweaver intersection point of triangle, when K > 1, multiple points are inner interweaver intersection point and the triangle top of the sloped triangular shape
The point determined between point according to ratio value.
In step S4, by the inclination triangular facet corresponding data texturing being calculated in step S3 and each dem data
It is three-dimensional to be mapped to entire relief map according to the corresponding DEM three-dimensional surface of these data texturings for the corresponding data texturing of central point
On surface, the relief map for being mapped with texture information is formed.
With that by taking moon relief map as an example, each step is described in detail in conjunction with Fig. 2 to Fig. 5.
Fig. 2A is the three-dimensional terrain data of the dem data of 1.5m resolution ratio, and Fig. 2 B is the 1.5m resolution that Fig. 2A corresponds to range
The flat image data texturing of the DOM data of rate, Fig. 2 C are directly to correspond plane DOM texture by pixel directly to map
The texture mapping solid landform effect picture formed to three-dimensional topographical surface, in figure pit edge keep left upper area can see it is very bright
There are deformations for aobvious texture.
Fig. 3 A to Fig. 3 C is that pixel inclined direction surface constructs schematic diagram, and the central point in Fig. 3 A plan view is pixel point,
Eight stains of surrounding are its neighborhood points, two neighborhood points that connection central point is western and the northwestward is adjacent may make up one three
Edged surface, and so on, clockwise, eight inclination triangular facets of the pixel peripheral neighborhood can be obtained, Fig. 3 B is then opened up
Show that the triangular facet of left figure shows situation in perspective view, Fig. 3 C is illustrated when vertical direction draws high increasing, and triangular facet exists
Display situation in perspective view.
Fig. 4 is the newly-increased inclined surface of composition, according to the fixed-point texture numerical value of triangular facet, three using three pixels as endpoint
The line of slope of edged surface, the side length on each side of triangular facet calculate the corresponding texture of each point on triangular facet in the way of oriented weighting
Numerical value.
Fig. 5 is based on the three-dimensional landform effect picture that progress texture mapping obtains after present invention processing, as shown in Figure 5, the figure
After increasing inclined surface texture mapping compared to Fig. 2 C, the case where deformation texture, is improved, moon relief map effect
Fruit has been significantly improved.
It unless there are known entitled phase otherwise anticipates, the numerical parameter in this specification and appended claims is approximation, energy
Characteristic changing needed for the content of enough bases through the invention is resulting.Specifically, all be used in specification and claim
The middle content for indicating composition, the number of reaction condition etc., it is thus understood that repaired by the term of " about " in all situations
Decorations.Under normal circumstances, the meaning expressed refers to include by specific quantity ± 10% variation in some embodiments, some
± 5% variation in embodiment, ± 1% variation in some embodiments, in some embodiments ± 0.5% variation.
The another aspect of the embodiment of the present invention additionally provides a kind of image texture mapping device of relief map, wherein
It is stored with executable instruction, and the executable instruction when executed by one or more processors, makes one or more of
Processor executes following operation:
Number according to the digital complex demodulation data of relief map and with the relief map isospace range
Word orthophotoquad DOM data, draw high the dem data；
According to the dem data after drawing high, multiple inclination triangular facets are constructed；
Determine data texturing corresponding in each inclination triangular facet；
Institute is mapped to using DOM data as texture according to the spatial position of dem data pixel and the data texturing
It states on relief map.
To sum up, the image texture mapping method and device of relief map of the invention, by will weight reconcile interpolation it
The texture mapping of DOM data afterwards is on the dem data to after drawing high, the relief map after the texture mapping of formation,
Its texture is more uniform neat, the defect that the texture mapping of Local terrain changes large area can be overcome to deform, preferable table
The real features for having reached relief map are of great significance for presenting and expressing topography and geomorphology minutia.
Furthermore "comprising" does not exclude the presence of element or step not listed in the claims." one " located in front of the element
Or "one" does not exclude the presence of multiple such elements.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of image texture mapping method of relief map, comprising:
According to the digital complex demodulation data of relief map and with the relief map isospace range number just
Striograph DOM data are penetrated, the dem data is drawn high；
According to the dem data after drawing high, multiple inclination triangular facets are constructed；
Determine data texturing corresponding in each inclination triangular facet；
It is mapped to described vertical according to the spatial position of dem data pixel and the data texturing using DOM data as texture
On body topographic map.
2. according to the method described in claim 1, wherein, drawing high, specifically including to the dem data:
According to the requirement that the relief map charts, determine vertical direction scale bar draws high coefficient N, thus to the DEM
Data are drawn high.
3. according to the method described in claim 1, wherein, constructing multiple inclination triangular facets, specifically including:
By pixel inclined direction surface developing algorithm, centered on pixel, 8 inclinations by pixel are constructed with eight neighborhood range
Triangular facet.
4. according to the method described in claim 1, wherein it is determined that data texturing corresponding in each inclination triangular facet, specific to wrap
It includes:
Based on weighting reconciliation texture-mapping algorithm, in clockwise direction, successively calculate corresponding in each inclination triangular facet
Data texturing.
5. according to the method described in claim 3, wherein, by pixel inclined direction surface developing algorithm, centered on pixel,
8 inclination triangular facets by pixel are constructed with eight neighborhood range, are specifically included:
Dem data pixel is traversed, pixel center and pixel eight neighborhood center is connected along clockwise direction and connects eight neighbours
Domain center, so that connection obtains nine particles and using it as 8 triangular facets on vertex, the inclined direction that building obtains pixel is all
Surface, i.e. inclination triangular facet.
6. according to the method described in claim 5, wherein, after constructing 8 inclination triangular facets, further comprising the steps of: calculating and respectively inclining
The ratio of oblique triangular facet area and unit pixel area, and it is rounded determining integer ratios K, and K meets formula: K=[S1/(0.5*
S2)], wherein S1For sloped triangular shape area, S2For unit pixel area.
7. according to the method described in claim 4, wherein, texture-mapping algorithm is reconciled based on weighting, in clockwise direction,
Data texturing corresponding in each inclination triangular facet is successively calculated, is specifically included:
The each pixel of the dem data and its field pixel are traversed, it is corresponding in DOM data to find each pixel according to plane coordinates
Texture pixel；
Build on dem data 8 inclination triangular facets are respectively corresponded into 8 plane trigonometry faces in DOM data, are being drawn
K point is inserted into inclination triangular facet after rising；
The plane coordinates and elevation for calculating sloped triangular shape interpolation points, if the inclined-plane Atria pixel on dem data is
P1、P2And P3, acquirement interpolation point is P0, the texture pixel of corresponding 3 DOM data is Q1、Q2And Q3If P0Point and inclination triangle
The distance a, b, c on each vertex of shape, the inclination alpha of sloped triangular shape calculate its texture value Q taken in DOM data0, Q0Calculating it is public
Formula are as follows:
Q0=(a/ (a+b+c) * Q1+b/(a+b+c)*Q2+c/(a+b+c)*Q3)*cosα。
8. according to the method described in claim 7, wherein, the point sampling method of the K point is the interior angle along inclination triangular facet
Bisector, the point is the inner interweaver intersection point of the inclination triangular facet when K=1, and when K > 1, multiple points are the inclination triangular facet
The point determined between inner interweaver intersection point and triangular apex according to ratio value.
9. according to the method described in claim 1, wherein, according to the spatial position of dem data pixel and the data texturing,
Using DOM data as texture, it is mapped on the relief map, comprising steps of
By the corresponding data texturing of the central point of the data texturing and each dem data, according to its corresponding DEM three-dimensional table
Face is mapped on entire relief map three-dimensional surface, forms the relief map for being mapped with texture information.
10. a kind of image texture mapping device of relief map, wherein it is stored with executable instruction, the executable finger
It enables when executed by one or more processors, one or more of processors is made to execute following operation:
According to the digital complex demodulation data of relief map and with the relief map isospace range number just
Striograph DOM data are penetrated, the dem data is drawn high；
According to the dem data after drawing high, multiple inclination triangular facets are constructed；
Determine data texturing corresponding in each inclination triangular facet；
It is mapped to described vertical according to the spatial position of dem data pixel and the data texturing using DOM data as texture
On body topographic map.
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| CN112184900A (en) * | 2019-07-04 | 2021-01-05 | 北京四维图新科技股份有限公司 | Method and device for determining elevation data and storage medium |
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