CN109188459A - A kind of small obstacle recognition method in ramp based on multi-line laser radar - Google Patents
A kind of small obstacle recognition method in ramp based on multi-line laser radar Download PDFInfo
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- CN109188459A CN109188459A CN201811000910.4A CN201811000910A CN109188459A CN 109188459 A CN109188459 A CN 109188459A CN 201811000910 A CN201811000910 A CN 201811000910A CN 109188459 A CN109188459 A CN 109188459A
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Abstract
The present invention relates to a kind of small obstacle recognition methods in the ramp based on multi-line laser radar, realize the small obstacle recognition on ramp road surface, quick and precisely, save calculation resources, ensure that real-time；Traditional obstacle recognition method is effectively prevented the drawbacks of road surface is identified as barrier by the missing inspection of downhill path section barrier and uphill way, improves the travel safety of intelligent driving automobile and the adaptability to complex road condition.
Description
Technical field
The present invention relates to a kind of small obstacle recognition methods in the ramp based on multi-line laser radar, belong to unmanned obstacle
Object identifies field.
Background technique
Detection of obstacles on vehicle driving road is in pilotless automobile surrounding enviroment cognition technology research field
The effect of important component, detection of obstacles is directly related to the traffic safety of pilotless automobile.Tradition is based on multi-thread thunder
The obstacle detection method reached is all the point cloud that filters out all z coordinates be less than-h rough according to the mounting height h of radar, this
Method can be identified as ramp large obstacle in the section that will be gone up a slope, and can filter out downhill path section on ramp
Small obstacle.So a kind of obstacle recognition method that can be suitably used for ramp road conditions is particularly important.
Summary of the invention
The present invention provides a kind of small obstacle recognition method in the ramp based on multi-line laser radar, is applicable not only to horizontal road
Face, and it is suitable for ramp road surface, accurately road surface and barrier can be distinguished, there is stronger practicability and wide
Application prospect.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of small obstacle recognition method in ramp based on multi-line laser radar, comprising the following steps:
The first step is carried out road-edge detection to original point cloud, filters out the region on the outside of road based on Hough transformation, obtain
In to road with the reference point cloud of obstacle recognition；
Second step is projected to the reference point cloud on the road surface of ramp with obstacle recognition and road based on projection dimension reduction method
On the vertical perpendicular XOZ in face, ramp road identify and filter out ramp road surface, Hough straight line is recycled to become
Swap-in row detection, so that all reference point clouds for belonging to road surface scanning element are accurately found out, then in the phase for belonging to road surface scanning element
It closes and all road surface points is filtered out again in point cloud；
Third step carries out outlier to the range within ten meters on the road surface of ramp and filters out, filters out road surface zero according to outlier
Scattered point cloud makes the point cloud after filtering out belong to barrier scanning element；
4th step, the barrier scanning element after being filtered out using the DBCSAN clustering algorithm based on density to outlier carry out into
One step filters out noise spot, realizes barrier cluster；
As present invention further optimization, by the region segmentation inside and outside road, the point cloud in region forms image coordinate
Space, using Hough transformation by point Cloud transform conllinear in image coordinate space into parameter space, these clouds parameter sky
Between in intersect at same point, the straight line that intersects with ramp pavement edge is excluded by Hough transformation, with this to road on the outside of
Region is filtered out, and the reference point cloud in road with obstacle recognition is obtained；
As present invention further optimization, if not finding road edge, i.e. selection two lateral extent of automobile body is each
Five meters of inner regions are as cut zone；
As present invention further optimization, based on projection dimension reduction method, by the phase on the road surface of ramp with obstacle recognition
It closes point cloud to project on the perpendicular XOZ vertical with road surface, the projection plane of reference point cloud is formed, on a projection plane from thunder
A continuous straight line is formed up to nearest stretch face, intermediate one section of ramp is the straight line of segmentation, and remaining stretch face exists
It is not shown on projection plane；Hough transformation is carried out for the point cloud number after aforementioned all projections, the length to be formed is found out and is greater than
0.5 meter of straight line, so that the straight line for road surface is found, to accurately find out all reference point clouds for belonging to road surface scanning element；
As present invention further optimization, in the range of within ten meters on the road surface of ramp, in input data to point
The range distribution of cloud to point of proximity cloud is calculated, and show that a cloud to the average distance of its point of proximity cloud, is in this average departure
From average value ranges in point cloud be barrier scanning element, incongruent cloud is rejected；
As present invention further optimization, it is circular conical surface by the region that every line of radar scans, uses
DBCSAN clustering algorithm judges this by calculating the density value in the Euclidean distance and its place sweep radius between each point
A little points are to belong to core point, boundary point either noise spot.
By above technical scheme, compared with the existing technology, the invention has the following advantages:
The present invention realizes the small obstacle recognition on ramp road surface, quick and precisely, saves calculation resources, ensure that in real time
Property；Traditional obstacle recognition method is effectively prevented road surface to be known the missing inspection of downhill path section barrier and uphill way
Not Wei barrier the drawbacks of, improve the travel safety of intelligent driving automobile and the adaptability to complex road condition.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
It is the small obstacle recognition flow chart in ramp of the preferred embodiment of the present invention shown in Fig. 1；
It is the confirmatory experiment scene figure of the preferred embodiment of the present invention shown in Fig. 2；
In Fig. 3,3a is that Hough transformation detects the straight line schematic diagram in image coordinate space, and 3b is that straight line schematic diagram is mapped to
Sine curve in parameter space；
In Fig. 4,4a is road-edge detection effect picture, and 4b filters out the related point cloud chart after Independent Point cloud；
It is the xoz projecting method schematic diagram of the preferred embodiment of the present invention shown in Fig. 5；
It is the reference point cloud xoz drop shadow effect figure of the preferred embodiment of the present invention shown in Fig. 6；
It is the road surface recognition effect figure of the preferred embodiment of the present invention shown in Fig. 7；
It is the effect picture filtered out behind road surface of the preferred embodiment of the present invention shown in Fig. 8；
It is the effect picture rejected after outlier of the preferred embodiment of the present invention shown in Fig. 9；
It is the BSDCAN algorithm principle figure of the preferred embodiment of the present invention shown in Figure 10；
Be shown in Figure 11 the preferred embodiment of the present invention cluster after point cloud effect and each class mass center position.
In figure: 1-10 indicates the multiple cone buckets being distributed on the ground as small obstacle.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figure 1, a kind of small obstacle recognition method in ramp based on multi-line laser radar of the invention, including it is following
Step:
The first step is carried out road-edge detection to original point cloud, filters out the region on the outside of road based on Hough transformation, obtain
In to road with the reference point cloud of obstacle recognition；
Second step is projected to the reference point cloud on the road surface of ramp with obstacle recognition and road based on projection dimension reduction method
On the vertical perpendicular XOZ in face, ramp road identify and filter out ramp road surface, Hough straight line is recycled to become
Swap-in row detection, so that all reference point clouds for belonging to road surface scanning element are accurately found out, then in the phase for belonging to road surface scanning element
It closes and all road surface points is filtered out again in point cloud；
Third step carries out outlier to the range within ten meters on the road surface of ramp and filters out, filters out road surface zero according to outlier
Scattered point cloud makes the point cloud after filtering out belong to barrier scanning element；
4th step, the barrier scanning element after being filtered out using the DBCSAN clustering algorithm based on density to outlier carry out into
One step filters out noise spot, realizes barrier cluster；
As present invention further optimization, by the region segmentation inside and outside road, the point cloud in region forms image coordinate
Space, using Hough transformation by point Cloud transform conllinear in image coordinate space into parameter space, these clouds parameter sky
Between in intersect at same point, the straight line that intersects with ramp pavement edge is excluded by Hough transformation, with this to road on the outside of
Region is filtered out, and the reference point cloud in road with obstacle recognition is obtained；
As present invention further optimization, if not finding road edge, i.e. selection two lateral extent of automobile body is each
Five meters of inner regions are as cut zone；
As present invention further optimization, based on projection dimension reduction method, by the phase on the road surface of ramp with obstacle recognition
It closes point cloud to project on the perpendicular XOZ vertical with road surface, the projection plane of reference point cloud is formed, on a projection plane from thunder
A continuous straight line is formed up to nearest stretch face, intermediate one section of ramp is the straight line of segmentation, and remaining stretch face exists
It is not shown on projection plane；Hough transformation is carried out for the point cloud number after aforementioned all projections, the length to be formed is found out and is greater than
0.5 meter of straight line, so that the straight line for road surface is found, to accurately find out all reference point clouds for belonging to road surface scanning element；
As present invention further optimization, in the range of within ten meters on the road surface of ramp, in input data to point
The range distribution of cloud to point of proximity cloud is calculated, and show that a cloud to the average distance of its point of proximity cloud, is in this average departure
From average value ranges in point cloud be barrier scanning element, incongruent cloud is rejected；
As present invention further optimization, it is circular conical surface by the region that every line of radar scans, uses
DBCSAN clustering algorithm judges this by calculating the density value in the Euclidean distance and its place sweep radius between each point
A little points are to belong to core point, boundary point either noise spot.
Specific operating process is as follows:
The first step shown in Fig. 2, is distributed multiple cone buckets on the ground, will be unrelated with small obstacle detection as small obstacle
Point cloud in region is first filtered out, to reduce the calculation resources consumption of points cloud processing below；Extraneous areas referred to herein
For the region on the outside of road, this system only detects the barrier on road；
Straight line is detected first with Hough transformation, searches road edge, Hough transformation detects straight line schematic diagram, in Fig. 3,3a
With shown in 3b: Hough transformation by the point transformation in image coordinate space into parameter space, conllinear point in image coordinate space
After transforming in parameter space, same point is all intersected in parameter space, at this time obtained ρ, θ, ρ, θ are required straight line
Pole coordinate parameter, the conllinear two o'clock (x of image coordinate spacei,yi) and (xj,yj), (xi,yi) and (xj,yj) it is mapped to parameter
Space is two sine curves, intersects at point (ρ0,θ0), as shown in 3b in Fig. 3；Conversely, intersecting at same point in parameter space
All sine curves have conllinear point to be corresponding to it in image coordinate space；According to this characteristic, given image coordinate space
Some marginal points, so that it may pass through Hough transformation determine connection these point linear equation；When using Hough transformation here,
Here we limit θ ∈ (- 45 °, 45 °), to exclude the straight line intersected with road edge as far as possible.
If finding road edge, as shown in 4a in Fig. 4, two straight lines in figure are the road edge detected；
Then the point cloud data on the outside of road is filtered out, as shown in 4b in Fig. 4；Wherein, the method for filtering out a cloud is, is point with road edge
Boundary line is the point cloud on the inside of road close to middle line, such as straight line " x=0 " in figure, otherwise is the point cloud on the outside of road, will put cloud
X, y, z coordinate value is set as INF, and (preset infinitely large quantity is herein 10000.0, i.e., 10000.0 meters are considered as nothing in systems
It is poor big), coordinate is that can all be ignored in operation of the point of INF below, that is, is filtered out, side point cloud is not dealt in road；
If not finding road edge, using each 5 meters of inner regions of distance at left and right sides of automobile body as relevant range (with two
Body width is safe distance)；In addition, passing through detection road edge, it is known that, there is 4.7 ° of drift angle immediately ahead of road and radar,
Radar center point is deviated to the right 0.2 meter of lane center.
Second step, general detection of obstacles is will not specially to go to filter out road surface point cloud, because of general detection of obstacles
Object be mostly large obstacle, they included point cloud signal it is more much more than the point cloud signal on the ground near them,
So road surface point cloud is very small on large obstacle detection influence；And in the process of multi-line laser radar identification small obstacle
In, road surface filtering is extremely important, it is unobvious with road surface differentiation because the point cloud quantity that small barrier itself includes is considerably less,
By 3b in Fig. 3 as it can be seen that small barrier almost combines together with ground, road surface point cloud is maximum noise in entire point cloud signal,
In order to preferably carry out further work, first have to filter out in road surface point cloud, to improve signal-to-noise ratio；But accurately filter out ground ratio
More difficult, 3b can be seen that in a top view from Fig. 3, and the point cloud shape on road surface is circular arc or ellipse, be unfavorable for unified
Feature screened, need to go out ground point cloud from new angle extraction thus, and this paper presents one kind in cloud signal
Definition goes out the new method on road surface, this process employs the method for projection dimensionality reduction and Hough transformation, projection drop herein
Dimension is different from the projection dimensionality reduction in most papers, and the projection dimensionality reduction of most papers is all that 3D point cloud is projected to 2D water
Plane forms 2D map, and herein then from new angle, all the points cloud is projected into the perpendicular perpendicular to road surface
On, it is specific as shown in Figure 4；
In Fig. 5, using the central point of multi-line laser radar as coordinate origin, cartesian coordinate system is established, wherein o ' (x0,y0,
z0) it is corresponding points of the radar center point on lane center, o ' o " is the tangent line at the place lane center o ', and θ is o ' o " in y-axis
Angle；The plane perpendicular to road surface where o ' o " is the projection plane of all the points cloud；Herein with matrix A storage region point
The three-dimensional coordinate information for cutting rear all the points cloud, then have
Enable the point cloud coordinate matrix of projectionIt indicates, then has
For the point cloud in 4b in Fig. 4, θ=4.7 °, x0=-0.2, y0=0, projection result, as shown in Figure 6；
For figure after Binding experiment projection it is found that shown in Fig. 7, road surface is approximately straight line, and nearest from radar one
Road section surface forms a continuous straight line, intermediate one section of ramp, because sweeping to road surface since radar point cloud data is than comparatively dense
Harness it is less, so be segmentation straight line, and last stretch face inherently without point cloud distribution, so from projection
It is displayed without road surface.After projection, Hough transformation is carried out herein for the 2D point cloud data, the inside length is found out and is greater than 0.5 meter
Straight line because the diameter of small barrier circumsphere be no more than 0.5 meter, find straight line herein and be only possible to be road surface；Hough
After transformation, the point cloud below the point cloud and the direction straight line z that all straight lines for meeting length include is filtered out；Effect after filtering out road surface
For fruit as shown in figure 8, after the filtering of road surface, ground point cloud has filtered out the position that completely can clearly be observed that cone bucket completely.Third
In step, how outlier filters out scattered point；
After the point cloud for having filtered out road surface and extraneous areas, still have as shown in Figure 8, in point cloud chart some very scattered
Point cloud noise, at this point, the application will filter out scattered point cloud according to outlier, to guarantee that remaining cloud is barrier institute
The point cloud for including；Specific algorithm used in this application is that statistics outlier rejects algorithm, and the analysis of this algorithm execution point cloud is simultaneously
And the point cloud for being unsatisfactory for designated statistics feature can be rejected；Statistical nature in the application is in being averaged for distance between a cloud
Within the scope of one near value, and reject the too many point of those deviation averages.One statistics is carried out to the neighborhood of each cloud
Analysis, and trim those point clouds for not meeting certain standard；
Specifically, being calculated herein each point the calculating of the range distribution of cloud to point of proximity cloud in input data
It arrives the average distance of its all point of proximity clouds.Assuming that obtain the result is that a Gaussian Profile, shape is by mean value and mark
Quasi- difference determines, point of the average distance except critical field (being defined by global distance average and variance), can be defined as from
Group puts and can get rid of from data set；After this algorithm, the point isolated in point cloud chart is also filtered out, to prevent from filtering
The cone bucket of distant place is removed, only the carry out outlier in 10 meters is filtered out, as shown in Figure 9:
In 4th step, the region of the every line scanning of multi-line laser radar is a circular conical surface, therefore even if radar scanning is arrived
The object of rule, an even plane, point cloud distribution on this plane is also non-uniform.Complicated in face of motor vehicle environment
When environment, the point cloud distribution scanned is that extremely unevenly, shape also calculate by irregular, classical Kmeans algorithm and hierarchical clustering
Method will face huge failure risk, use the BDSCAN algorithm based on density herein to adapt to such case, BDSCAN algorithm
Barrier can be effectively clustered out, and noise spot can be further filtered out, accomplishes quick and precisely, calculation resources to be saved, to protect
Demonstrate,prove real-time.The schematic diagram of BDSCAN algorithm, as shown in Figure 10:
Judge that these points belong to by calculating the density value in the Euclidean distance and its place sweep radius between each point
In core point, boundary point or noise spot.It is 1.5 that sweep radius is set in Figure 10, density threshold 3, so:
(1) P0 point is boundary point, because only there are two point P0 and P1 in the sweep radius centered on it；
(2) P1 point is core point, because there are four point P0, P1, P2, P4 in the sweep radius centered on it；
(3) P8 is noise spot, because it is neither core point nor boundary point；
(4) other are put.
After point cloud tracking BDSCAN in Fig. 9 is clustered, obtained effect is as shown in figure 11, the effect of comparative diagram 11 with
And the position in kind of Fig. 2, it is known that all cone buckets are detected.
After BDSCAN algorithm according to third step step by further cancelling noise point cloud (i.e. by the XYZ coordinate assignment of cloud
For INF).
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in the application fields.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.
The meaning of "and/or" described herein refers to that the case where respective individualism or both exists simultaneously wraps
Including including.
The meaning of " connection " described herein can be between component be directly connected to be also possible to pass through between component
Other components are indirectly connected with.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (6)
1. a kind of small obstacle recognition method in ramp based on multi-line laser radar, it is characterised in that: the following steps are included:
The first step is carried out road-edge detection to original point cloud, filters out the region on the outside of road based on Hough transformation, obtain
In road with the reference point cloud of obstacle recognition；
Reference point cloud on the road surface of ramp with obstacle recognition is projected to and is hung down with road surface based on projection dimension reduction method by second step
On straight perpendicular XOZ, to ramp road carry out identify and ramp road surface is filtered out, recycle Hough straight line convert into
Row detection, so that all reference point clouds for belonging to road surface scanning element are accurately found out, then in the reference point for belonging to road surface scanning element
All road surface points are filtered out again in cloud；
Third step carries out outlier to the range within ten meters on the road surface of ramp and filters out, and it is scattered to filter out road surface according to outlier
Point cloud, makes the point cloud after filtering out belong to barrier scanning element；
4th step, the barrier scanning element after being filtered out using the DBCSAN clustering algorithm based on density to outlier carry out further
Noise spot is filtered out, realizes barrier cluster.
2. the small obstacle recognition method in the ramp according to claim 1 based on multi-line laser radar, it is characterised in that: will
Region segmentation inside and outside road, the point cloud in region form image coordinate space, will be in image coordinate space using Hough transformation
For conllinear point Cloud transform into parameter space, these clouds intersect at same point in parameter space, are arranged by Hough transformation
Except the straight line intersected with ramp pavement edge, region on the outside of road is filtered out with this, obtains knowing in road with barrier
Other reference point cloud.
3. the small obstacle recognition method in the ramp according to claim 2 based on multi-line laser radar, it is characterised in that: if
Road edge is not found, i.e. selection each five meters of inner regions of two lateral extent of automobile body are as cut zone.
4. the small obstacle recognition method in the ramp according to claim 1 based on multi-line laser radar, it is characterised in that: base
In projection dimension reduction method, the reference point cloud on the road surface of ramp with obstacle recognition is projected into the perpendicular vertical with road surface
On XOZ, the projection plane of reference point cloud is formed, the stretch face nearest from radar forms one continuously directly on a projection plane
Line, intermediate one section of ramp are the straight line of segmentation, and remaining stretch face is not shown on a projection plane；For aforementioned all throwings
The point cloud number of movie queen carries out Hough transformation, finds out the straight line that formation length is greater than 0.5 meter, so that the straight line for road surface is found, from
And accurately find out all reference point clouds for belonging to road surface scanning element.
5. the small obstacle recognition method in the ramp according to claim 1 based on multi-line laser radar, it is characterised in that: right
On the road surface of ramp within ten meters in the range of, the range distribution of cloud to point of proximity cloud is calculated in input data, is obtained
Cloud is put out to the average distance of its point of proximity cloud, and the point cloud in the average value ranges in this average distance is that barrier is swept
Described point, incongruent cloud are rejected.
6. the small obstacle recognition method in the ramp according to claim 1 based on multi-line laser radar, it is characterised in that: logical
Crossing the region that every line of radar scans is circular conical surface, using DBCSAN clustering algorithm, passes through the Europe calculated between each point
Formula distance and its place sweep radius in density value come judge these point be belong to core point, boundary point either noise spot.
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