CN107103603A - A kind of Objects extraction method of inclination measurement scene - Google Patents
A kind of Objects extraction method of inclination measurement scene Download PDFInfo
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- CN107103603A CN107103603A CN201710350830.0A CN201710350830A CN107103603A CN 107103603 A CN107103603 A CN 107103603A CN 201710350830 A CN201710350830 A CN 201710350830A CN 107103603 A CN107103603 A CN 107103603A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/12—Edge-based segmentation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20112—Image segmentation details
- G06T2207/20116—Active contour; Active surface; Snakes
Abstract
The present invention discloses the Objects extraction method of inclination measurement scene, and initial dip measurement scene uses tree-like storage structured data, and whole scene is root node, is made up of multiple scenario block child nodes, this method includes：(1) setting Objects extraction region；(2) setting height filtering surface；(3) atural object triangular facet pel is extracted, is handled by the way of recombination region union operation；(4) atural object is separated, all triangular facets carried out first using contour line to the inclination measurement data triangulation network after triangulation, subdivision in contour line are atural object pel；Secondly in former scenario node, all triangular facets in current atural object profile are extracted, single atural object pel packet are stored as, and label using the ID of atural object；(5) atural object is operated, including：Obtain the addition and search operaqtion of atural object primitive data, distance calculating, ray collision detection ground object model associative operation, and terrain object attribute information.
Description
Technical field
The invention belongs to the technical field of power circuit design, more particularly to a kind of Objects extraction of inclination measurement scene
Method, it can automatically extract house tree under the premise of data precision and the atural object profile degree of accuracy is ensured from inclination measurement scene
The atural objects such as wood.
Background technology
Oblique photograph dimensional Modeling Technology and application are the focuses of survey field concern in recent years, due to its data precision
Outstanding advantages are widely used in each side such as smart city, wisdom water conservancy, smart travel to high, ground mulching comprehensively etc..The present invention
Relate generally to its application in power circuit design aspect.
Require to obtain the scissors crossing atural objects such as house, trees, road in the range of line corridor in power circuit design to believe
Breath, measures these atural objects to the distance of power line, shaft tower etc., according to measurement reasonable selection shaft tower position, shaft tower model, frame
Line parameter etc. meets the check requirement of power circuit design specification with guarantee.But the initial data of inclination measurement is typically using certainly
Dynamicization mode generates three-dimensional scenic achievement, due to its formation mechanism, and obtained model is a continuous TIN (irregular triangle
Net) to stick on figure, i.e. atural object, landform etc. be integrally provided as one, be not divided into atural object can be with not individually operated
Object, can not enter row distance calculation and check in this case.Therefore, inclination measurement scene is used in power circuit design
When, it is necessary first to singulation processing is carried out to the atural object that the power circuits such as the house in scene, trees are concerned about.
The atural object singulation mode on the market in inclination measurement scene three-dimensional applications mainly has three kinds at present：One kind is on ground
Supporting vector face is superimposed on thing, is monomer effect to the eye, actually simply building profile point is simply queried
Vector face, rather than monomer separation truly；Two be simple triangular facet packet, and original triangular facet in scene is direct
Atural object or landform are divided into, but such processing can cause atural object border that zigzag, and the atural object side of different accuracy grade is presented
Boundary is inconsistent, and pole unsightly, and can not be with terrain scene when needing to replace with atural object the high-precision model of manual manufacture
Realize seamless spliced；Three be that artificial setting atural object border carries out triangular facet cutting separation atural object, and such a method atural object border is compared
Neat appearance, different accuracy level boundaries are consistent, and do not damage original data precision.But this method operation is comparatively laborious, both takes
Manpower, is extremely difficult to atural object profile and accurately matches again.
The content of the invention
The technology of the present invention solves problem：Overcoming the deficiencies in the prior art, there is provided a kind of atural object of inclination measurement scene
Extracting method, it has higher automaticity, it is only necessary to which simple operations can obtain atural object precise boundary, with house, tree
The function that the atural objects such as wood are really separated with inclination measurement scene, it is ensured that atural object has the accuracy of initial data, Ke Yifang
Atural object is just replaced with to the model of artificial fine modeling, edge is accurately spliced, can be in the case of retention data be high-precision
Realize rapid loading display.
The present invention technical solution be：The Objects extraction method of this inclination measurement scene, initial dip measurement field
Scape use tree-like storage structured data, whole scene be root node, be made up of multiple scenario block child nodes, each child node except
Possess the triangular facet pel collection of itself, also comprising several higher precision grade scenario block child nodes, the inclination measurement scene
Objects extraction method comprises the following steps：
(1) setting Objects extraction region, Objects extraction region is will extract the scope of atural object, and the region is taken turns by some borders
Profile and some empty contour line compositions, boundary contour define the foreign range boundary line for extracting region, empty contour line definition
Extract the internal range boundary line in region, for the part that need not be extracted in exclusionary zone, within border beyond cavity for ground
Thing extracts region；
(2) setting height filtering surface, highly filtered face is such a curved surface, and its horizontal extent is limited by Objects extraction region
System, just change rises and falls (or being constant) physical features of the elevation in the range of, and the filtering surface is higher than background terrain and is less than and to carry
The minimum altitude of atural object main part is taken, atural object forms isolated island triangular facet set one by one higher than the part of filtering surface, by institute
Some isolated island triangular facets take out and project to horizontal plane, and it projects the boundary line that outline is atural object；
(3) atural object triangular facet pel is extracted, all atural object triangular facets obtained according to step (2) calculate atural object boundary profile
Line, is handled by the way of recombination region union operation here；
(4) atural object is separated, using the atural object contour line obtained by step (3) calculating from inclination measurement extracting data atural object,
All triangular facets after triangulation, subdivision in contour line are carried out to the inclination measurement data triangulation network using contour line first
For atural object pel；Secondly in former scenario node, all triangular facets in current atural object profile are extracted, are stored as individually
The packet of atural object pel, and labelled using the ID of atural object；
(5) atural object is operated, and atural object operation includes：Atural object primitive data is obtained, distance is calculated, ray collision detection atural object mould
Type associative operation, and terrain object attribute information addition and search operaqtion.
, only need to be to original because the present invention retains Raw scene data, it is possible to easily change or delete atural object
Contextual data is cut again according to amended all relative profiles.Because the present invention saves all atural object number of contours
According to when needing to change the contextual data of higher precision, only need to reading all outline datas automatically and cut again, it is not necessary to again
Secondary setting atural object profile by hand.The present invention obtains atural object border using atural object contour extraction method, simple to operate, and accuracy is high,
And multiple atural objects can be extracted simultaneously, also substantially increase operating efficiency while accuracy is improved.Due to present invention use
The method of actual separation initial dip measurement scene pel carries out singulation, realizes singulation truly.Singulation
Atural object afterwards can be individually operated to its as independent individual, such as sets the colors different from background, individually chooses, and obtains summit
Data etc., meet power circuit design requirement.The present invention, will be with wheel by the way of atural object profile wire cutting triangle primitives
The intersecting triangle of profile is rebuild as the combination of multiple triangles, then chooses triangle in contour line as atural object number
According to not only ensure that the neat in edge of atural object profile is attractive in appearance, and conveniently replace with higher precision, more attractive artificial model.
All accuracy class primitive datas of the original scene of present invention cutting, the atural object primitive data after cutting retains in pel group form
In former scenario node, identified by atural object ID.Before the accuracy class and precision switchover policy and singulation of line map tuple
Do not change, so as to ensure that higher atural object display precision and rendering speed.Ensure that with any zoom state simultaneously
Thing border is constant.Therefore, the present invention has higher automaticity, it is only necessary to which simple operations can obtain atural object precise boundary,
The function being really separated with atural objects such as house, trees with inclination measurement scene, it is ensured that atural object has the essence of initial data
Exactness, can facilitate the model that atural object is replaced with to artificial fine modeling, and edge is accurately spliced, can be high-precision in retention data
Rapid loading display is realized in the case of degree.
Brief description of the drawings
Fig. 1 is the main flow chart of the Objects extraction method of the inclination measurement scene according to the present invention.
Fig. 2 is the schematic diagram of the recombination region of the present invention.
Fig. 3 is the flow chart of the atural object contours extract of the present invention.
Embodiment
As shown in figure 1, the Objects extraction method of this inclination measurement scene, initial dip measurement scene uses tree-like storage
Structured data, whole scene is root node, is made up of multiple scenario block child nodes, triangle of each child node except possessing itself
Face pel collection, also comprising several higher precision grade scenario block child nodes, the Objects extraction method bag of the inclination measurement scene
Include following steps：
(1) setting Objects extraction region, Objects extraction region is will extract the scope of atural object, and the region is taken turns by some borders
Profile and some empty contour line compositions, boundary contour define the foreign range boundary line for extracting region, empty contour line definition
Extract the internal range boundary line in region, for the part that need not be extracted in exclusionary zone, within border beyond cavity for ground
Thing extracts region；
(2) setting height filtering surface, highly filtered face is such a curved surface, and its horizontal extent is limited by Objects extraction region
System, just change rises and falls (or being constant) physical features of the elevation in the range of, and the filtering surface is higher than background terrain and is less than and to carry
The minimum altitude of atural object main part is taken, atural object forms isolated island triangular facet set one by one higher than the part of filtering surface, by institute
Some isolated island triangular facets take out and project to horizontal plane；
(3) atural object triangular facet pel is extracted, all atural object triangular facets obtained according to step (2) calculate atural object boundary profile
Line, is handled by the way of recombination region union operation here；
(4) atural object is separated, using the atural object contour line obtained by step (3) calculating from inclination measurement extracting data atural object,
All triangular facets after triangulation, subdivision in contour line are carried out to the inclination measurement data triangulation network using contour line first
As atural object pel；Secondly in former scenario node, all triangular facets in current atural object profile is extracted, list is stored as
Only atural object pel packet, and labelled using the ID of atural object；
(5) atural object is operated, and atural object operation includes：Atural object primitive data is obtained, distance is calculated, ray collision detection atural object mould
Type associative operation, and terrain object attribute information addition and search operaqtion.
, only need to be to original because the present invention retains Raw scene data, it is possible to easily change or delete atural object
Contextual data is cut again according to amended all relative profiles.Because the present invention saves all atural object number of contours
According to when needing to change the contextual data of higher precision, only need to reading all outline datas automatically and cut again, it is not necessary to again
Secondary setting atural object profile by hand.The present invention obtains atural object border using atural object contour extraction method, simple to operate, and accuracy is high,
And multiple atural objects can be extracted simultaneously, also substantially increase operating efficiency while accuracy is improved.Due to present invention use
The method of actual separation initial dip measurement scene pel carries out singulation, realizes singulation truly.Singulation
Atural object afterwards can be individually operated to its as independent individual, such as sets the colors different from background, individually chooses, and obtains summit
Data etc., meet power circuit design requirement.The present invention, will be with wheel by the way of atural object profile wire cutting triangle primitives
The intersecting triangle of profile is rebuild as the combination of multiple triangles, then chooses triangle in contour line as atural object number
According to not only ensure that the neat in edge of atural object profile is attractive in appearance, and conveniently replace with higher precision, more attractive artificial model.
All accuracy class primitive datas of the original scene of present invention cutting, the atural object primitive data after cutting retains in pel group form
In former scenario node, identified by atural object ID.Before the accuracy class and precision switchover policy and singulation of line map tuple
Do not change, so as to ensure that higher atural object display precision and rendering speed.Ensure that with any zoom state simultaneously
Thing border is constant.Therefore, the present invention has higher automaticity, it is only necessary to which simple operations can obtain atural object precise boundary,
The function being really separated with atural objects such as house, trees with inclination measurement scene, it is ensured that atural object has the essence of initial data
Exactness, can facilitate the model that atural object is replaced with to artificial fine modeling, and edge is accurately spliced, can be high-precision in retention data
Rapid loading display is realized in the case of degree.
In addition, in the step (1), setting Objects extraction region includes：Boundary contour and empty profile are chosen by hand
Line, by choosing intersecting point one by one in three-dimensional scenic during first extraction atural object, defines some closing multi-line sections, closes multi-line section
For contour line, each contour line represents a border or cavity in region, and a border and its internal some cavities define one
Continuum, all contour lines are simple polygon, and phase friendship is not present between same polygonal any two lines section
Condition, any two contour line is non-intersect；Two be that the area data prestored is loaded from file, and the extraction area data of manual definition is protected
It is stored in file, it is necessary to be loaded when reusing from file and directly act on inclination measurement scene.
In addition, in the step (2), highly filtered face burns sth to the ground two kinds of the highly filtered face in highly filtered face and mountain region；
If landform residing for atural object be level land or atural object main part far above the microrelief on ground and ground, using horizontal plane conduct
Filtering surface, constructs all summits on the triangulation network, and the triangulation network according to zone boundary contour line and empty contour line and is all set to same
One height, the plane is to extract the highly filtered face in level land in region；If landform is not smooth enough residing for atural object, or atural object main body
Highly relatively low, it is not easy to mutually to be distinguished with earth bulge, using the highly filtered face in the mountain region being defined by the user, the filtering surface is with physical features
Fluctuations, first define previous step the boundary contour and empty contour line that extract region by certain horizontal interval progress
Interpolation processing, then the elevation of each point of inclination measurement data acquisition is inquired about, added by operating personnel by way of mouse is clicked
Plus some ground points, ground point is evenly distributed in extraction region planted agent and covers all ground as far as possible, for wanting what is filtered out
Microspike, also gathers its summit, and it is irregular that above-mentioned all contour line interpolation points and discrete ground point are merged together into construction
The triangulation network, this triangulation network is the highly filtered face in mountain region.
In addition, for the highly filtered face in level land, directly comparing summit elevation and horizontal plane elevation；It is highly filtered for mountain region
Face, height is inquired about using the apex horizontal coordinate of inclination measurement data on this filtering surface, if apex height is more than filtering surface height
Angle value, then this point is atural object summit, otherwise it is assumed that being ground point, is ignored；If all summits of a triangular facet are all higher than
Filtering surface, then be labeled as atural object triangular facet by this triangular facet.
In addition, in the step (3), use the mode of recombination region union operation for：
(a) recombination region A and B are made into standardization processing respectively, boundary contour is processed as summit by arranged counterclockwise
Closing multi-line section, empty contour line is processed as closing multi-line section of the summit by arranged clockwise；
(b) intersection point of each contour line in the A of zoning and each contour line in the B of region, and each handing over
Point is separately recorded in two profile cable architectures, and each intersection point is identified using globally unique intersection point number；
(c) every contour line is split as some multi-line sections according to intersection point, every multi-thread segment record its start-stop intersection point number, institute
There is multi-line section to be included into two multi-line section groups of A, B respectively by its original affiliated area；
(d) multi-line section is filtered, A group multi-line sections are filtered using region B, the multi-line section being in the B of region is rejected, reservation is in
Multi-line section outside B；B group multi-line sections are similarly filtered using region A；
(e) alternately take out multi-line section from two groups of AB according to start-stop intersection point number to be spliced, the new contour line of formation；
(f) union recombination region C is constructed, the contour line that step (e) is obtained adds this region, the profile of arranged counterclockwise
Wire tag is border, and the contour line of arranged clockwise is labeled as cavity；
(g) all outermost layer boundary contours in recombination region C are obtained, atural object boundary line is used as.
In addition, in the step (4), for a triangular facet to be split, triangle and current outline line are calculated first
Intersection point, this triangle is ignored if without intersection point；Contour line is split as by some multi-line sections according to intersection point, retains triangle scope
Interior multi-line section, deletes other multi-line sections；The summit for some multi-line sections that 3 summits of former triangle and step (3) are obtained
Reconfigure the triangulation network, it is ensured that each multi-line section is appeared in as the side of triangle in the triangulation network of neotectonics, these broken lines
Some sections can be divided into, but there can not be missing；After the completion of triangle subdivision, former triangle is deleted from the scene triangulation network
Remove, instead all new triangles of triangulation generation.
In addition, in the step (4), each triangle in being grouped for scene pel calculates triangle level first
Central point, the plane coordinates (XY) on Atria summit is separately summed again divided by 3, triangle center point coordinates is obtained；Secondly
Judge triangle center point whether in atural object profile；Atural object pel is finally separating, if current triangle is in outline polygon
It is interior, then removed during it is grouped from the landform of world subdivision, and be added in current atural object packet, if not in outline polygon
It is interior, then ignore.
In addition, in the step (5), the primitive information of atural object, atural object primitive information is obtained from three-dimensional scenic to be needed to refer to
Determine the accuracy class of atural object ID and model, inquired about step by step since root node, the node until reaching given level, if node
Primitive data is not loaded, then is loaded from corresponding data file, and the pel group specified is obtained according to ID, is packaged as the lattice needed
Formula, returns to root node step by step.
In addition, in the step (5), ray collision detection is：First by the mouse click location in 3-D graphic window
The ray in three dimensions is converted to, then ray is touched with the atural object packet in each visible elements in inclination measurement scene
Detection is hit, if collision distance is less than current minimum collision distance, the atural object belonging to the triangular facet of current point and hit is recorded
ID, has handled the inclination measurement atural object that all visible elements are just hit.
In addition, in the step (5), distance is calculated as：The distance between the electrical bodies such as power line and atural object are calculated, is used
The full accuracy pel of atural object is calculated, and for each atural object, obtains its full accuracy grade triangle network data, these are calculated successively
The distance of triangular facet and electric wire simultaneously takes minimum value.
The present invention is described in detail with reference to embodiment.
Initial dip measurement scene uses tree-like storage structured data.Whole scene is root node, by multiple scenario blocks
Node is constituted.Each triangular facet pel collection of the child node except possessing itself, also comprising several higher precision grade scenario blocks
Child node.So successively subdivision is gone down, until highest ranking child node.Scenario node accuracy class is higher, and its details is abundanter,
And areal extent is smaller.It is according to the decision of the distance of node to video camera (representing the observer in three-dimensional scenic) during render scenes
Render present node pel collection and still render child node.
The inclination measurement scene house trees extracting method that the present invention is provided, the inclination for above tree-like storage structure is surveyed
Measure contextual data and carry out atural object cutting lock out operation, referring to Fig. 1, comprise the following steps：
1) setting Objects extraction region
Objects extraction region defines the scope of atural object to be extracted, and the region is by some boundary contours and some empty profiles
Line is constituted.Boundary contour defines the foreign range boundary line for extracting region, and empty contour line defines the internal range for extracting region
Boundary line, for need not be extracted in exclusionary zone part (exclusion be not required to part to be processed can improve subsequent treatment speed
Degree), i.e., within border beyond cavity for Objects extraction region.Can be using two ways setting Objects extraction region, one is hand
Work chooses boundary contour and empty contour line, and two be that the area data prestored is loaded from file.
(1) manual definition Objects extraction region
Some closing multi-line sections can be defined by choosing intersecting point one by one in three-dimensional scenic during first extraction atural object, that is, taken turns
Profile.Each contour line represents a border or cavity in region, and a border and its internal some cavities define one continuously
Region.All contour lines should be simple polygon, i.e., phase friendship is not present between same polygonal any two lines section
Condition.Any two contour line should not intersect.Each contour line answers adeditive attribute, is border or cavity to distinguish.
Generally, the extraction region of definition should surround the institute of atural object floor projection a little and area is as far as possible small, to protect
Card obtains the complete and correct atural object in border, but in order to shorten the artificial treatment time, can also define relatively rough extraction area
Domain, and fine processing is carried out by the follow-up link that automatically processes.In addition, in power circuit design for reduce atural object and electric wire it
Between distance amount of calculation, improve check speed, can also only choose the nearer part of distance line in atural object, this is to meet electricity
Line of force road design actual conditions.
(2) using existing Objects extraction area data
The extraction area data of manual definition can be saved in file, it is necessary to be loaded and direct from file when reusing
Act on inclination measurement scene.It is particularly suitable for use in original contextual data being replaced by the situation of higher precision contextual data, saves
Again the troublesome operation in manual definition Objects extraction region one by one.Area data in file saves atural object ID, during establishment
Between etc. information, identical order is carried out when should be created with last time when choosing atural object again.
2) setting height filtering surface
Highly filtered face is such a curved surface, and its horizontal extent is limited by Objects extraction region, and elevation is in the range of
Physical features height change rises and falls (or being constant).(including ground and attachment are on the ground higher than background terrain for the overanxious face
Short vegetation, vehicle etc.), and less than to extract the minimum altitude of atural object main part, then atural object is higher than the part of filtering surface
" isolated island " one by one is formed, all isolated island triangular facets are taken out and horizontal plane is projected to, it projects outline as
The boundary line of thing.The atural objects such as the trees that such a algorithm caves inward for the building with vertical wall face and bottom are accurate
Degree is particularly high.
To take into account efficiency and the degree of accuracy of Objects extraction, highly filtered face is burnt sth to the ground and two kinds of mountain region.If atural object institute
Locate landform be level land or atural object main part far above the microrelief (vegetation, vehicle etc.) on ground and ground, water can be used
Plane is used as filtering surface.The benefit of horizontal plane is that the summit for differentiating triangular facet is in filtering surface top or lower section and its simple fast
Speed, as long as the height value of triangle vertex of surface is directly compared with overanxious face height value as size.Specific practice is according to upper
All summits on zone boundary contour line and empty contour line the construction triangulation network, and the triangulation network that one step is defined all are set to same
Individual height, the i.e. plane are to extract the horizontal plane in region.
If landform is not smooth enough residing for atural object, such as hillside river levee, or atural object body height are relatively low, it is not easy to ground
Projection is mutually distinguished, then should be using the highly filtered face in mountain region being defined by the user, and the filtering surface is with physical features fluctuations.Such a method
Speed is slower, but the degree of accuracy is high, can save adjustment correction time of the later stage to wrong data, generally efficiency is higher.Specifically
Way is that the boundary contour and empty contour line that previous step is defined into extraction region first are inserted by certain horizontal interval
Value processing, then the elevation of each point of inclination measurement data acquisition is inquired about, this step is automatically performed, and is intervened without operating personnel；
Some ground points are added by way of mouse is clicked by operating personnel, ground point is evenly distributed in extraction region planted agent and to the greatest extent may be used
All ground can be covered, for wanting the microspike filtered out, its summit should be also gathered.By above-mentioned all contour line interpolation points and
Discrete ground point is merged together construction TIN, and this triangulation network is the highly filtered face in mountain region.
After filtering surface construction complete, operating personnel's manual setting this filtering surface height, until meeting following require：(1) institute
The atural object main part to be extracted is located on filtering surface；(2) ground and earth bulge are all located under filtering surface.If can not reach
To this requirement, then the part that region is allowed to avoid filtering out is extracted in modification, or addition ground point reconfigures filtering surface, directly
Untill meeting and requiring.
For horizontal filtering face, directly compare summit elevation and horizontal plane elevation；For mountain region filtering surface, surveyed using tilting
The apex horizontal coordinate of amount data inquires about height on this filtering surface.If apex height is more than filtering surface height value, this point is
Atural object summit, otherwise it is assumed that being ground point, is ignored.If all summits of a triangular facet are all higher than filtering surface, by this
Triangular facet is labeled as atural object triangular facet.
3) atural object border is calculated
All atural object triangular facets obtained according to previous step calculate atural object boundary contour automatically.Here recombination region is used
The mode of union operation is handled.Recombination region refers to a kind of such region (see Fig. 2)：
(1) recombination region is made up of at least one independent subregion；
(2) independent subregion refers to the region surrounded by a continuous outermost layer boundary contour；
(3) outermost layer border refers to the boundary contour not surrounded by other any contour lines；
(4) each boundary contour (being not limited to outermost layer boundary contour) can surround some empty contour lines, empty
Hole contour line necessarily be in boundary contour；
(5) some boundary contours can be surrounded in each empty contour line；
(6) cannot be directly nested between boundary contour；
(7) cannot be directly nested between empty contour line；
(8) all contour lines should be simple polygon, and all contour lines must not intersect.
Two recombination region (setting respectively A and B) union operation rules are following (referring to Fig. 3)：
(1) recombination region A and B are made into standardization processing respectively, boundary contour is processed as summit by arranged counterclockwise
Closing multi-line section, empty contour line is processed as closing multi-line section of the summit by arranged clockwise；
(2) intersection point of each contour line in the A of zoning and each contour line in the B of region, and each handing over
Point is separately recorded in two profile cable architectures.Each intersection point is identified using globally unique intersection point number, additionally needs point coordinates,
Serial number in current outline line intersection point etc.；
(3) every contour line is split as some multi-line sections according to intersection point, every multi-thread segment record its start-stop intersection point number.Institute
There is multi-line section to be included into two multi-line section groups of A, B respectively by its original affiliated area；
(4) multi-line section is filtered.A group multi-line sections are filtered using region B, rejected at the multi-line section inside the B of region, reservation
Multi-line section outside B；B group multi-line sections are similarly filtered using region A；
(5) splice multi-line section, form new contour line.Specific practice is that a multi-line section is taken out from A group multi-line sections
a1, searched in the B of region with multi-line section a1Period is terminated as the multi-line section b of starting period1, spliced in current multi-line section
Afterwards, and terminating point period is changed for b1Terminating point period, form new multi-line section a1b1；Searched again from the A of region with a1b1
Terminate multi-line section a of the period for starting period2And splice in thereafter, form multi-line section a1b1a2.Such cycle alternation is carried out, directly
Multi-line section, the contour line after as one merging are closed to forming one.Every used multi-line section will be deleted from former group
Remove.Repeat aforesaid operations, all multi-line sections until having handled；
(6) union recombination region C is constructed, the contour line that step (5) is obtained adds this region, the profile of arranged counterclockwise
Wire tag is border, and the contour line of arranged clockwise is labeled as cavity；
(7) all outermost layer boundary contours in recombination region C, as atural object boundary line are obtained.
Specifically in this patent, an empty recombination region A is first initialized, then each triangular facet is regard as recombination region
Domain B and A carries out union operation, obtains union refion C.Region C is done as new region A with next triangular facet region B again
Union operation, so circulation, all triangular facets until having handled.Extract all ragged edges in final operation result region C
Boundary's contour line, as atural object envelope.
4) Objects extraction
Using step 3) calculate obtained by atural object contour line from inclination measurement extracting data atural object.Contour line is used first
All triangular facets carried out to the inclination measurement data triangulation network after triangulation, subdivision in contour line are atural object pel.
(1) triangulation
For a triangular facet to be split, the intersection point of triangle and current outline line is calculated first, is neglected if without intersection point
Omit this triangle.Contour line is split as by some multi-line sections according to intersection point.Retain the multi-line section in the range of triangle, delete other
Multi-line section.
The summit for some multi-line sections that 3 summits of former triangle and previous step are obtained reconfigures the triangulation network.Construction
The triangulation network can use popular De Luonai Triangulation Methods (Delaunay triangulation).It should be noted that
Ensure in the triangulation network that each multi-line section appears in neotectonics as the side of triangle, if these broken lines can be divided into
Dry section, but can not have missing.
After the completion of triangle subdivision, former triangle is deleted from the scene triangulation network, instead the institute of triangulation generation
There is new triangle.
The situation of one triangle of processing be these are only, it is necessary to handle other all triangles of current scene piecemeal successively
Shape.It is expanded to other world subdivisions of current accuracy grade, the inclination measurement contextual data of other accuracy classes successively again.
Can be non-intersect as quick rejecting means using profile encirclement frame and world subdivision encirclement frame during subdivision, without every
Individual triangle is all calculated in detail.
(2) atural object is separated
In former scenario node, all triangular facets in current atural object profile are extracted, single atural object is stored as
Pel is grouped, and is labelled using the ID of atural object.The packet of this pel is pel packet of the atural object in current scene node.
Each triangle in being grouped for scene pel, performs following operation：
Triangle horizontal center point is calculated first.By the plane coordinates (XY) on Atria summit be separately summed again divided by
3, you can obtain triangle center point coordinates.
Secondly judge triangle center point whether in atural object profile.Rudimentary algorithm is：One origin of construction is triangle
Central point, and direction is the ray of (1,0).Calculate ray situation about intersecting with atural object outline polygon, whenever ray with it is polygon
When a line of shape is intersecting, with regard to carrying out conversion or opposite conversion once from inside to outside.Record is tracked through polygon
Several parities, illustrates that triangle center point is located in polygon through odd-times, and even-times explanation is located at outside polygon.
It is finally separating atural object pel.If current triangle is in outline polygon, by it from the landform of world subdivision
Remove, and be added in current atural object packet in packet.If not in outline polygon, ignored.
The every other triangle of current scene piecemeal is handled successively.Pel quilt after the completion of processing in original scenario node
It is divided into a landform packet and multiple atural objects packet (being belonging respectively to multiple atural objects).Atural object pel packet atural object ID marks, and
Pel extraction can be carried out by atural object ID or the operation such as color is set.
Aforesaid operations are expanded to other scenario nodes of present level, to ensure atural object integrality；It is expanded to other again
Level data, so as to ensure the precision uniformity of atural object and terrain data.
5) atural object is operated
Atural object operation is mainly calculated including obtaining atural object primitive data, distance, ray collision detection ground object model is related grasps
Make, and terrain object attribute information addition and search operaqtion.
1. primitive information is obtained
The primitive information of atural object is needed to use in some cases, and ground object model is such as exported as to the file of specified format for other
Program use.Atural object primitive information is obtained from three-dimensional scenic to be needed to specify the accuracy class of atural object ID and model.From
Root node starts to inquire about step by step, the node until reaching given level.If node primitive data is not loaded, from corresponding data
File is loaded.The pel group specified is obtained according to ID, the form needed is packaged as, root node is returned to step by step.
2. ray collision detection
It is frequently necessary to choose atural object with mouse in three-dimensional circuits design to perform other operations.First by 3-D graphic window
In mouse click location be converted to ray in three dimensions, then by each visible elements in ray and inclination measurement scene
Atural object packet carry out collision detection, if collision distance is less than current minimum collision distance, record current point and hit
Atural object ID belonging to triangular facet, the inclination measurement atural object that having handled all visible elements can be hit (may also be hit
Any object in landform or no point).
3. distance is calculated
The main purpose that atural object is imported in power circuit design is to calculate the distance between the electrical bodies such as power line and atural object,
And make comparisons to differentiate whether current design reasonable with the safe distance in design specification.It is high due to electrically checking precision prescribed,
Therefore it should be calculated using the full accuracy pel of atural object, i.e., for each atural object, obtain its full accuracy grade triangle netting index
According to calculating the distance of these triangular facets and electric wire successively and take minimum value.
4. adeditive attribute information
An attribute data structures are created for each atural object, are identified using atural object ID.Terrain object attribute can be divided into shared category
Property and the class of privately owned attribute two, have attribute be applied to each atural object, comprising atural object classification, atural object title, atural object color, whether
Display etc.；Privately owned attribute is applied to a certain or several atural objects, such as height of house, the owner, trees height.Terrain object attribute can
Merge with atural object profile and be saved in data file, so as to reading next time.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not made to the present invention, it is every according to
Any simple modification, equivalent variations and the modification made according to the technical spirit of the present invention to above example, still belong to the present invention
The protection domain of technical scheme.
Claims (10)
1. a kind of Objects extraction method of inclination measurement scene, it is characterised in that：Initial dip measurement scene uses tree-like storage
Structured data, whole scene is root node, is made up of multiple scenario block child nodes, triangle of each child node except possessing itself
Face pel collection, also comprising several higher precision grade scenario block child nodes, the Objects extraction method bag of the inclination measurement scene
Include following steps：
(1) setting Objects extraction region, Objects extraction region is will extract the scope of atural object, and the region is by some boundary contours
Constituted with some empty contour lines, boundary contour defines the foreign range boundary line for extracting region, empty contour line definition is extracted
The internal range boundary line in region, for the part that need not be extracted in exclusionary zone, being carried for atural object beyond cavity within border
Take region；
(2) setting height filtering surface, highly filtered face is such a curved surface, and its horizontal extent is limited by Objects extraction region,
Physical features height change of the elevation in the range of rises and falls, and the filtering surface, which is higher than background terrain and is less than, will extract atural object main part
Minimum altitude, atural object forms isolated island triangular facet set one by one higher than the part of filtering surface, and all isolated island triangular facets are taken
Go out and project to horizontal plane, it projects the boundary line that outline is atural object；
(3) atural object triangular facet pel is extracted, all atural object triangular facets obtained according to step (2) calculate atural object boundary contour,
Here handled by the way of recombination region union operation；
(4) separate atural object, using step (3) calculate obtained by atural object contour line from inclination measurement extracting data atural object, first
It is ground that all triangular facets after triangulation, subdivision in contour line are carried out to the inclination measurement data triangulation network using contour line
Thing pel；Secondly in former scenario node, all triangular facets in current atural object profile is extracted, are stored as individually
Thing pel is grouped, and is labelled using the ID of atural object；
(5) atural object is operated, and atural object operation includes：Atural object primitive data is obtained, distance is calculated, ray collision detection ground object model phase
Close operation, and terrain object attribute information addition and search operaqtion.
2. the Objects extraction method of inclination measurement scene according to claim 1, it is characterised in that：In the step (1),
Setting Objects extraction region includes：Boundary contour and empty contour line are chosen by hand, by three-dimensional during first extraction atural object
Intersecting point is chosen in scene one by one, some closing multi-line sections are defined, closing multi-line section is contour line, and each contour line represents region
A border or cavity, a border and its internal some cavities define a continuums, and all contour lines are simple
Intersecting situation is not present between polygon, same polygonal any two lines section, any two contour line is non-intersect；Two are
Load the area data that prestores from file, the extraction area data of manual definition be saved in file, it is necessary to when reusing from
File loads and directly acts on inclination measurement scene.
3. the Objects extraction method of inclination measurement scene according to claim 2, it is characterised in that：In the step (2),
Highly filtered face burns sth to the ground two kinds of the highly filtered face in highly filtered face and mountain region；If landform residing for atural object is level land or ground owner
Body portion is far above the microrelief on ground and ground, using horizontal plane as filtering surface, according to zone boundary contour line and
All summits on empty contour line the construction triangulation network, and the triangulation network are all set to same height, and the plane is extraction region
The highly filtered face in level land；If landform is not smooth enough residing for atural object, or atural object body height is relatively low, it is not easy to earth bulge phase
Distinguish, using the not contour filtering surface being defined by the user, previous step is defined extract first by the filtering surface with physical features fluctuations
The boundary contour in region and empty contour line carry out interpolation processing by certain horizontal interval, then inquire about inclination measurement data and obtain
The elevation for taking each to put, some ground points are added by operating personnel by way of mouse is clicked, and ground point is extracting region
Planted agent is evenly distributed and covers all ground as far as possible, for wanting the microspike filtered out, also gathers its summit, by above-mentioned institute
There are contour line interpolation point and discrete ground point to be merged together construction TIN, this triangulation network is that mountain region is highly filtered
Face.
4. the Objects extraction method of inclination measurement scene according to claim 3, it is characterised in that：Spent for level land height
Filtering surface, directly compares summit elevation and horizontal plane elevation；For the highly filtered face in mountain region, using the summit water of inclination measurement data
Flat seat, which is marked on this filtering surface, inquires about height, if apex height is more than filtering surface height value, and this point is atural object summit, is otherwise recognized
To be ground point, ignored；If all summits of a triangular facet are all higher than filtering surface, this triangular facet is labeled as atural object
Triangular facet.
5. the Objects extraction method of inclination measurement scene according to claim 4, it is characterised in that：In the step (3),
Use the mode of recombination region union operation for：
(a) recombination region A and B are made into standardization processing respectively, boundary contour is processed as envelope of the summit by arranged counterclockwise
Multi-line section is closed, empty contour line is processed as closing multi-line section of the summit by arranged clockwise；
(b) intersection point of each contour line in the A of zoning and each contour line in the B of region, and each intersection point is divided
Do not record in two profile cable architectures, each intersection point is identified using globally unique intersection point number；
(c) every contour line is split as some multi-line sections according to intersection point, every multi-thread segment record its start-stop intersection point number, Suo Youduo
Line segment is included into two multi-line section groups of A, B respectively by its original affiliated area；
(d) multi-line section is filtered, A group multi-line sections are filtered using region B, the multi-line section inside the B of region is rejected, retains and is in B
Outside multi-line section；B group multi-line sections are similarly filtered using region A；
(e) alternately take out multi-line section from two groups of AB according to start-stop intersection point number to be spliced, the new contour line of formation；
(f) union recombination region C is constructed, the contour line that step (e) is obtained adds this region, the contour line mark of arranged counterclockwise
Border is designated as, the contour line of arranged clockwise is labeled as cavity；
(g) all outermost layer boundary contours in recombination region C are obtained, atural object boundary line is used as.
6. the Objects extraction method of inclination measurement scene according to claim 5, it is characterised in that：In the step (4),
For a triangular facet to be split, the intersection point of triangle and current outline line is calculated first, this triangle is ignored if without intersection point
Shape；Contour line is split as by some multi-line sections according to intersection point, retains the multi-line section in the range of triangle, deletes other multi-line sections；
The summit for some multi-line sections that 3 summits of former triangle and step (3) are obtained reconfigures the triangulation network, it is ensured that each is multi-thread
The side of Duan Zuowei triangles is appeared in the triangulation network of neotectonics, and these broken lines can be divided into some sections, but can not have
Missing；After the completion of triangle subdivision, former triangle is deleted from the scene triangulation network, instead triangulation generation is all new
Triangle.
7. the Objects extraction method of inclination measurement scene according to claim 6, it is characterised in that：In the step (4),
Each triangle in being grouped for scene pel, calculates triangle horizontal center point first, by the flat of Atria summit
Areal coordinate (XY) is separately summed again divided by 3, obtains triangle center point coordinates；Secondly judge triangle center point whether in atural object wheel
In wide；Atural object pel is finally separating, if current triangle is in outline polygon, it is grouped from the landform of world subdivision
It is middle to remove, and be added in current atural object packet, if not in outline polygon, ignored.
8. the Objects extraction method of inclination measurement scene according to claim 7, it is characterised in that：In the step (5),
The primitive information of atural object, atural object primitive information is obtained from three-dimensional scenic to be needed to specify the accuracy class of atural object ID and model,
Inquired about step by step since root node, the node until reaching given level, if node primitive data is not loaded, from corresponding number
Loaded according to file, the pel group specified is obtained according to ID, be packaged as the form needed, root node is returned to step by step.
9. the Objects extraction method of inclination measurement scene according to claim 7, it is characterised in that：In the step (5),
Ray collision detection is：Mouse click location in 3-D graphic window is converted to the ray in three dimensions first, then will
Atural object packet in ray and inclination measurement scene in each visible elements carries out collision detection, if collision distance is less than currently most
Small collision distance, then record the atural object ID belonging to the triangular facet of current point and hit, having handled all visible elements must
To the inclination measurement atural object of hit.
10. the Objects extraction method of inclination measurement scene according to claim 7, it is characterised in that：The step (5)
In, distance is calculated as：The distance between the electrical bodies such as power line and atural object are calculated, is calculated using the full accuracy pel of atural object,
For each atural object, its full accuracy grade triangle network data is obtained, the distance of these triangular facets and electric wire is calculated successively and is taken
Minimum value.
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