CN112060087A - Point cloud collision detection method for robot to grab scene - Google Patents

Point cloud collision detection method for robot to grab scene Download PDF

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CN112060087A
CN112060087A CN202010885649.1A CN202010885649A CN112060087A CN 112060087 A CN112060087 A CN 112060087A CN 202010885649 A CN202010885649 A CN 202010885649A CN 112060087 A CN112060087 A CN 112060087A
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coordinate system
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robot
bounding box
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CN112060087B (en
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汪良红
王辉
陈新
许藤
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Foshan Longshen Robot Co Ltd
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    • G06T7/00—Image analysis
    • G06T7/70—Determining position or orientation of objects or cameras
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J9/00—Programme-controlled manipulators
    • B25J9/16—Programme controls
    • B25J9/1628—Programme controls characterised by the control loop
    • B25J9/163—Programme controls characterised by the control loop learning, adaptive, model based, rule based expert control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J9/00—Programme-controlled manipulators
    • B25J9/16—Programme controls
    • B25J9/1674—Programme controls characterised by safety, monitoring, diagnostic
    • B25J9/1676—Avoiding collision or forbidden zones
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0014—Image feed-back for automatic industrial control, e.g. robot with camera
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10028—Range image; Depth image; 3D point clouds
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30108—Industrial image inspection
    • G06T2207/30164—Workpiece; Machine component
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2210/00—Indexing scheme for image generation or computer graphics
    • G06T2210/12—Bounding box
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    • G06T2210/21—Collision detection, intersection

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Abstract

The invention provides a point cloud collision detection method for a robot to grab a scene, which comprises the following steps: s1: constructing an enclosure model of a robot clamping jaw, and acquiring point cloud data of a workpiece area; s2: establishing a robot coordinate system, a vertex coordinate system and a point coordinate system, and acquiring a homogeneous transformation matrix; s3: respectively acquiring the coordinates of each vertex of the bounding box model and each point of the point cloud under a robot coordinate system according to the homogeneous transformation matrix; s4: judging the relation between each point of the point cloud and the bounding box model to obtain the number of the points of the point cloud in the bounding box model; s5: and comparing the number of points of the point cloud in the bounding box model with a preset threshold value, thereby detecting whether the clamping jaw collides with an actual object in advance. The invention provides a point cloud collision detection method for a robot to grab a scene, which solves the problem that the grabbing is unstable due to collision conflict caused by the fact that a clamping jaw touches other workpieces in the process of grabbing workpieces by the existing robot.

Description

Point cloud collision detection method for robot to grab scene
Technical Field
The invention relates to the technical field of robot vision, in particular to a point cloud collision detection method for a robot to grab a scene.
Background
With the reduction of labor cost and the development of robotics and computer vision technology, robots will be used in higher and higher proportion in the production process. The 3D vision guide robot grabbing is a key technology for realizing intelligent production of the robot. At present, due to the complexity of a production environment and the instability of 3D vision recognition, in the actual production process, the 3D vision can recognize that bottom workpieces or workpiece clamping positions interfere with each other, so that a clamping jaw can touch other workpieces to generate collision conflict in the grabbing process, and the grabbing is unstable.
In the prior art, as a chinese patent disclosed in 2019, 7, 12, a method and a device for controlling robot motion, a storage medium and a robot, the publication number is CN110000793A, a three-dimensional model of a workpiece is constructed according to a three-dimensional point cloud image set corresponding to the workpiece; planning a motion track on line according to the three-dimensional model of the workpiece; when the robot moves along the motion track, whether the robot collides or not is detected, but collision detection is not carried out by detecting the number of point clouds in a certain range.
Disclosure of Invention
The invention provides a point cloud collision detection method for a robot grabbing scene, aiming at overcoming the technical defect that grabbing is unstable due to collision caused by the fact that a clamping jaw touches other workpieces in the process of grabbing workpieces by the existing robot.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a point cloud collision detection method for a robot to grab a scene comprises the following steps:
s1: constructing an enclosure box model of a robot clamping jaw, and collecting point cloud data of a workpiece area through a robot camera;
s2: establishing a robot coordinate system, a vertex coordinate system of each vertex of the bounding box model and a point coordinate system of each point in the point cloud, and acquiring homogeneous transformation matrixes of each vertex coordinate system and each point coordinate system in the robot coordinate system;
s3: respectively acquiring the coordinates of each vertex of the bounding box model and each point of the point cloud under a robot coordinate system according to the homogeneous transformation matrix;
s4: judging the relation between each point of the point cloud and the bounding box model according to each vertex of the bounding box model and the coordinates of each point of the point cloud under the robot coordinate system to obtain the number of the points of the point cloud in the bounding box model;
s5: comparing the number of points of the point cloud in the bounding box model with a preset threshold value;
if the number of the points of the point cloud in the bounding box model is smaller than a preset threshold value, the clamping jaw cannot collide with an actual object; otherwise, the jaws may collide with the actual object.
Preferably, in step S1, the bounding box model of the robot gripping jaw is specifically constructed as follows: n clamping fingers of the robot clamping jaw are simplified into N cuboid models by adopting a bounding box method, and N bounding box models are correspondingly obtained, wherein N is more than or equal to 2.
Preferably, step S2 further includes establishing a jaw coordinate system and a camera coordinate system.
Preferably, in step S2, the method further includes the steps of:
acquiring a homogeneous transformation matrix of a clamping jaw coordinate system under a robot coordinate system through a robot demonstrator;
acquiring a homogeneous transformation matrix of a camera coordinate system in a robot coordinate system through a hand-eye calibration matrix of the robot;
acquiring a homogeneous transformation matrix of each vertex coordinate system under a clamping jaw coordinate system through actual measurement;
and photographing by a robot camera to obtain a homogeneous transformation matrix of each point coordinate system in a camera coordinate system.
Preferably, in step S2, a homogeneous transformation matrix of each vertex coordinate system in the robot coordinate system is obtained according to the homogeneous transformation matrix of each vertex coordinate system in the jaw coordinate system and the homogeneous transformation matrix of the jaw coordinate system in the robot coordinate system;
and obtaining a homogeneous transformation matrix of each point coordinate system in the robot coordinate system according to the homogeneous transformation matrix of each point coordinate system in the camera coordinate system and the homogeneous transformation matrix of the camera coordinate system in the robot coordinate system.
Preferably, step S3 specifically includes: obtaining the coordinates of each vertex of the bounding box model in the robot coordinate system according to the homogeneous transformation matrix of each vertex coordinate system in the robot coordinate system; and acquiring the coordinates of each point of the point cloud in the robot coordinate system according to the homogeneous transformation matrix of each point coordinate system in the robot coordinate system.
Preferably, in step S4, the relationship between the point cloud and the bounding box model is determined by the relationship between the point cloud and the three pairs of parallel planes of the bounding box model;
if the point of the point cloud is in three pairs of parallel planes of the bounding box model, the point of the point cloud is in the bounding box model; otherwise, the points of the point cloud are outside the bounding box model.
Preferably, the relation between the point of the point cloud and the parallel plane is obtained by calculating the normal included angle between the vector formed by the point of the point cloud and the vertex of the bounding box model and the parallel plane of the bounding box model;
if the included angles between the vector formed by the point of the point cloud and the vertex of the bounding box model and the normal lines of a pair of parallel planes are both acute angles or obtuse angles, the point is outside the pair of planes; otherwise the point is in the pair of planes.
Preferably, the step of determining the relationship between the point of the point cloud and the parallel plane by calculating the angle between the vector formed by the point of the point cloud and the vertex of the bounding box model and the normal of the parallel plane of the bounding box model is as follows:
s4.1: selecting a vertex in the bounding box model, setting the vertex as a first vertex, and setting three vertexes connected with the vertex as a second vertex, a third vertex and a fourth vertex respectively;
the three pairs of parallel planes of the bounding box model are respectively a pair of parallel x planes, a pair of parallel y planes and a pair of parallel z planes, the first vertex and the second vertex belong to different z planes, the first vertex and the third vertex belong to different y planes, and the first vertex and the fourth vertex belong to different x planes;
s4.2: acquiring the coordinates of the first vertex, the second vertex, the third vertex and the fourth vertex in a robot coordinate system
Figure BDA0002655491150000031
S4.3: calculating the vector v of the second vertex and the first vertex12：
Figure BDA0002655491150000032
Calculating the vector v of the third vertex and the first vertex13：
Figure BDA0002655491150000033
Calculating the vector v of the fourth vertex and the first vertex14：
Figure BDA0002655491150000034
S4.4: v is to be12、v13、v14Multiplying each two by two to respectively obtain a normal vector v of the x plane of the bounding box model under the robot coordinate systemxY normal vector of plane vyNormal vector v of z planez：
vx＝v12×v13；
vy＝v12×v14；
vz＝v13×v14；
S4.5: setting the coordinate of a point A in the point cloud under the robot coordinate system as p15Calculating the vector of the point A and the first vertex:
Figure BDA0002655491150000035
calculate the vector of point a and the second vertex:
Figure BDA0002655491150000036
calculate the vector of point a and the third vertex:
Figure BDA0002655491150000037
calculate the vector of point a and the fourth vertex:
Figure BDA0002655491150000041
s4.6: calculating vxAnd vp1、vp4The dot-product of (a) is,
Figure BDA0002655491150000042
Figure BDA0002655491150000043
if it is
Figure BDA0002655491150000044
And
Figure BDA0002655491150000045
with the same sign, point A is outside the parallel x-plane, if
Figure BDA0002655491150000046
And
Figure BDA0002655491150000047
the number of the opposite signs is different,point a is in the parallel x-plane;
calculating vyAnd vp1、vp3The dot-product of (a) is,
Figure BDA0002655491150000048
Figure BDA0002655491150000049
if it is
Figure BDA00026554911500000410
And
Figure BDA00026554911500000411
with the same sign, point A is outside the parallel y-plane, if
Figure BDA00026554911500000412
And
Figure BDA00026554911500000413
the opposite sign, point A is in the parallel y plane;
calculating vzAnd vp1、vp2The dot-product of (a) is,
Figure BDA00026554911500000414
Figure BDA00026554911500000415
if it is
Figure BDA00026554911500000416
And
Figure BDA00026554911500000417
with the same sign, point A is outside the parallel z-plane, if
Figure BDA00026554911500000418
And
Figure BDA00026554911500000419
opposite sign, point a is in the parallel z-plane.
Preferably, in step S5, if the number of points of the point cloud in the N bounding box models is less than the preset threshold, the clamping jaw will not collide with the actual object; otherwise, the jaws may collide with the actual object.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a point cloud collision detection method for a robot to grab a scene, which is characterized in that the number of points of a point cloud in an enclosing box model is obtained by judging the relation between the points of the point cloud and the enclosing box model under a robot coordinate system, so that whether a clamping jaw collides with an actual object or not is detected in advance.
Drawings
FIG. 1 is a flow chart of the steps for implementing the technical solution of the present invention;
fig. 2 is a schematic diagram of the relationship between the normal line included angle determination point and the parallel plane in step S4.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, a point cloud collision detection method for robot grabbing scene includes the following steps:
s1: constructing an enclosure box model of a robot clamping jaw, and collecting point cloud data of a workpiece area through a robot camera;
s2: establishing a robot coordinate system, a vertex coordinate system of each vertex of the bounding box model and a point coordinate system of each point in the point cloud, and acquiring homogeneous transformation matrixes of each vertex coordinate system and each point coordinate system in the robot coordinate system;
s3: respectively acquiring the coordinates of each vertex of the bounding box model and each point of the point cloud under a robot coordinate system according to the homogeneous transformation matrix;
s4: judging the relation between each point of the point cloud and the bounding box model according to each vertex of the bounding box model and the coordinates of each point of the point cloud under the robot coordinate system to obtain the number of the points of the point cloud in the bounding box model;
s5: comparing the number of points of the point cloud in the bounding box model with a preset threshold value;
if the number of the points of the point cloud in the bounding box model is smaller than a preset threshold value, the clamping jaw cannot collide with an actual object; otherwise, the jaws may collide with the actual object.
In the specific implementation process, a grabbing point is selected for detection, the number of points of the point cloud in the bounding box model is obtained by judging the relation between the point of the point cloud and the bounding box model under a robot coordinate system, and therefore whether the clamping jaw collides with an actual object or not when the grabbing point grabs is detected in advance.
More specifically, in step S1, constructing a bounding box model of the robot gripping jaw is specifically: n clamping fingers of the robot clamping jaw are simplified into N cuboid models by adopting a bounding box method, and N bounding box models are correspondingly obtained, wherein N is more than or equal to 2.
In the implementation process, the robot clamping jaw is generally a two-finger clamping jaw, and two clamping fingers of the robot clamping jaw are parallel.
More specifically, in step S2, establishing a jaw coordinate system and a camera coordinate system is further included.
In the specific implementation process, the clamping jaw coordinate system and the camera coordinate system are both established by the robot according to the self setting condition.
More specifically, in step S2, the method further includes the steps of:
acquiring a homogeneous transformation matrix of a clamping jaw coordinate system under a robot coordinate system through a robot demonstrator;
acquiring a homogeneous transformation matrix of a camera coordinate system in a robot coordinate system through a hand-eye calibration matrix of the robot;
acquiring a homogeneous transformation matrix of each vertex coordinate system under a clamping jaw coordinate system through actual measurement;
and photographing by a robot camera to obtain a homogeneous transformation matrix of each point coordinate system in a camera coordinate system.
In the implementation process, the rotating part of the homogeneous transformation matrix of each vertex coordinate system in the clamping jaw coordinate system is an identity matrix, and the rotating part of the homogeneous transformation matrix of each point coordinate system in the camera coordinate system is also an identity matrix.
More specifically, in step S2, a homogeneous transformation matrix of each vertex coordinate system in the robot coordinate system is obtained according to the homogeneous transformation matrix of each vertex coordinate system in the jaw coordinate system and the homogeneous transformation matrix of the jaw coordinate system in the robot coordinate system;
and obtaining a homogeneous transformation matrix of each point coordinate system in the robot coordinate system according to the homogeneous transformation matrix of each point coordinate system in the camera coordinate system and the homogeneous transformation matrix of the camera coordinate system in the robot coordinate system.
In the implementation process, a homogeneous transformation matrix of a vertex coordinate system under a clamping jaw coordinate system is assumed to be T42The homogeneous transformation matrix of the clamping jaw coordinate system under the robot coordinate system is T12Then the homogeneous transformation matrix of the vertex coordinate system under the robot coordinate system is T14＝T12*T24(ii) a Similarly, assume a homogeneous transformation matrix of a point coordinate system in the camera coordinate system as T35The homogeneous transformation matrix of the camera coordinate system under the robot coordinate system is T13Then the homogeneous transformation matrix of the point coordinate system in the robot coordinate system is T15＝T13*T35。
More specifically, step S3 specifically includes: obtaining the coordinates of each vertex of the bounding box model in the robot coordinate system according to the homogeneous transformation matrix of each vertex coordinate system in the robot coordinate system; and acquiring the coordinates of each point of the point cloud in the robot coordinate system according to the homogeneous transformation matrix of each point coordinate system in the robot coordinate system.
More specifically, in step S4, the relationship between the point cloud and the bounding box model is determined by the relationship between the point cloud and the three pairs of parallel planes of the bounding box model;
if the point of the point cloud is in three pairs of parallel planes of the bounding box model, the point of the point cloud is in the bounding box model; otherwise, the points of the point cloud are outside the bounding box model.
In the specific implementation process, the six planes which enclose the bounding box model are divided into three pairs of parallel planes.
More specifically, the relation between the point of the point cloud and the parallel plane is obtained by calculating the normal included angle between the vector formed by the point of the point cloud and the vertex of the bounding box model and the parallel plane of the bounding box model;
if the included angles between the vector formed by the point of the point cloud and the vertex of the bounding box model and the normal lines of a pair of parallel planes are both acute angles or obtuse angles, the point is outside the pair of planes; otherwise the point is in the pair of planes.
In the specific implementation process, the point and the parallel plane are judged by calculating the included angle of the normal line, so that the calculation process is simplified, and the detection efficiency is improved.
More specifically, the step of determining the relationship between the point of the point cloud and the parallel plane by calculating the angle between the vector formed by the point of the point cloud and the vertex of the bounding box model and the normal of the parallel plane of the bounding box model is as follows:
s4.1: selecting a vertex in the bounding box model, setting the vertex as a first vertex, and setting three vertexes connected with the vertex as a second vertex, a third vertex and a fourth vertex respectively;
the three pairs of parallel planes of the bounding box model are respectively a pair of parallel x planes, a pair of parallel y planes and a pair of parallel z planes, the first vertex and the second vertex belong to different z planes, the first vertex and the third vertex belong to different y planes, and the first vertex and the fourth vertex belong to different x planes;
as shown in fig. 2, the rectangular parallelepiped is a bounding box model, vertices 1, 2, 3, 4 correspond to a first vertex, a second vertex, a third vertex, and a fourth vertex of the bounding box model, respectively, point a1 is in a parallel plane y, and point a2 is outside the parallel plane y;
s4.2: acquiring the coordinates of the first vertex, the second vertex, the third vertex and the fourth vertex in a robot coordinate system
Figure BDA0002655491150000071
S4.3: calculating the vector v of the second vertex and the first vertex12：
Figure BDA0002655491150000072
Calculating the vector v of the third vertex and the first vertex13：
Figure BDA0002655491150000073
Calculating the vector v of the fourth vertex and the first vertex14：
Figure BDA0002655491150000074
S4.4: v is to be12、v13、v14Multiplying each two by two to respectively obtain a normal vector v of the x plane of the bounding box model under the robot coordinate systemxY normal vector of plane vyNormal vector v of z planez：
vx＝v12×v13；
vy＝v12×v14；
vz＝v13×v14；
S4.5: setting a point A in a point cloud on a machineThe coordinate in the human coordinate system is p15Calculating the vector of the point A and the first vertex:
Figure BDA0002655491150000075
calculate the vector of point a and the second vertex:
Figure BDA0002655491150000076
calculate the vector of point a and the third vertex:
Figure BDA0002655491150000081
calculate the vector of point a and the fourth vertex:
Figure BDA0002655491150000082
s4.6: calculating vxAnd vp1、vp4The dot-product of (a) is,
Figure BDA0002655491150000083
Figure BDA0002655491150000084
if it is
Figure BDA0002655491150000085
And
Figure BDA0002655491150000086
with the same sign, point A is outside the parallel x-plane, if
Figure BDA0002655491150000087
And
Figure BDA0002655491150000088
the opposite sign, point a is in the parallel x plane;
calculating vyAnd vp1、vp3The dot-product of (a) is,
Figure BDA0002655491150000089
Figure BDA00026554911500000810
if it is
Figure BDA00026554911500000811
And
Figure BDA00026554911500000812
with the same sign, point A is outside the parallel y-plane, if
Figure BDA00026554911500000813
And
Figure BDA00026554911500000814
the opposite sign, point A is in the parallel y plane;
calculating vzAnd vp1、vp2The dot-product of (a) is,
Figure BDA00026554911500000815
Figure BDA00026554911500000816
if it is
Figure BDA00026554911500000817
And
Figure BDA00026554911500000818
with the same sign, point A is outside the parallel z-plane, if
Figure BDA00026554911500000819
And
Figure BDA00026554911500000820
opposite sign, point a is in the parallel z-plane.
In the implementation process, if
Figure BDA00026554911500000821
And
Figure BDA00026554911500000822
and
Figure BDA00026554911500000823
and
Figure BDA00026554911500000824
if the products of the three pairs of points are different signs, the point A is in three pairs of parallel planes, namely the point A is in the bounding box model; otherwise, point a is outside the bounding box model.
More specifically, in step S5, if the number of points of the point cloud in the N bounding box models is less than the preset threshold, the clamping jaw will not collide with the actual object; otherwise, the jaws may collide with the actual object.
In the specific implementation process, if the number of the point cloud points in at least one bounding box model is greater than or equal to a preset threshold value, the corresponding clamping fingers collide with an actual object, namely the clamping jaws collide with the actual object; only when the number of the points of the point cloud in all the bounding box models is smaller than a preset threshold value, all the clamping fingers cannot collide with the actual object, and the clamping jaws cannot collide with the actual object.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A point cloud collision detection method for a robot to grab a scene is characterized by comprising the following steps:
s1: constructing an enclosure box model of a robot clamping jaw, and collecting point cloud data of a workpiece area through a robot camera;
s2: establishing a robot coordinate system, a vertex coordinate system of each vertex of the bounding box model and a point coordinate system of each point in the point cloud, and acquiring homogeneous transformation matrixes of each vertex coordinate system and each point coordinate system in the robot coordinate system;
s3: respectively acquiring the coordinates of each vertex of the bounding box model and each point of the point cloud under a robot coordinate system according to the homogeneous transformation matrix;
s4: judging the relation between each point of the point cloud and the bounding box model according to each vertex of the bounding box model and the coordinates of each point of the point cloud under the robot coordinate system to obtain the number of the points of the point cloud in the bounding box model;
s5: comparing the number of points of the point cloud in the bounding box model with a preset threshold value;
if the number of the points of the point cloud in the bounding box model is smaller than a preset threshold value, the clamping jaw cannot collide with an actual object; otherwise, the jaws may collide with the actual object.
2. The method for detecting point cloud collision of robot-grabbed scene as recited in claim 1, wherein in step S1, constructing a bounding box model of the robot jaws is specifically: n clamping fingers of the robot clamping jaw are simplified into N cuboid models by adopting a bounding box method, and N bounding box models are correspondingly obtained, wherein N is more than or equal to 2.
3. The method of claim 2, further comprising establishing a jaw coordinate system and a camera coordinate system in step S2.
4. The method of claim 3, further comprising the step of, in step S2:
acquiring a homogeneous transformation matrix of a clamping jaw coordinate system under a robot coordinate system through a robot demonstrator;
acquiring a homogeneous transformation matrix of a camera coordinate system in a robot coordinate system through a hand-eye calibration matrix of the robot;
acquiring a homogeneous transformation matrix of each vertex coordinate system under a clamping jaw coordinate system through actual measurement;
and photographing by a robot camera to obtain a homogeneous transformation matrix of each point coordinate system in a camera coordinate system.
5. The method for detecting point cloud collision of robot grabbing scene as claimed in claim 4, wherein in step S2, a homogeneous transformation matrix of each vertex coordinate system in the robot coordinate system is obtained according to the homogeneous transformation matrix of each vertex coordinate system in the jaw coordinate system and the homogeneous transformation matrix of the jaw coordinate system in the robot coordinate system;
and obtaining a homogeneous transformation matrix of each point coordinate system in the robot coordinate system according to the homogeneous transformation matrix of each point coordinate system in the camera coordinate system and the homogeneous transformation matrix of the camera coordinate system in the robot coordinate system.
6. The method for detecting point cloud collision in a robot-captured scene according to claim 5, wherein step S3 specifically comprises: obtaining the coordinates of each vertex of the bounding box model in the robot coordinate system according to the homogeneous transformation matrix of each vertex coordinate system in the robot coordinate system; and acquiring the coordinates of each point of the point cloud in the robot coordinate system according to the homogeneous transformation matrix of each point coordinate system in the robot coordinate system.
7. The method of claim 1, wherein in step S4, the relationship between the point cloud and the bounding box model is determined by the relationship between the point cloud and the three pairs of parallel planes of the bounding box model;
if the point of the point cloud is in three pairs of parallel planes of the bounding box model, the point of the point cloud is in the bounding box model; otherwise, the points of the point cloud are outside the bounding box model.
8. The method of claim 7, wherein the relationship between the point cloud and the parallel plane is determined by calculating a normal angle between a vector formed by the point cloud and the vertex of the bounding box model and the parallel plane of the bounding box model;
if the included angles between the vector formed by the point of the point cloud and the vertex of the bounding box model and the normal lines of a pair of parallel planes are both acute angles or obtuse angles, the point is outside the pair of planes; otherwise the point is in the pair of planes.
9. The method according to claim 8, wherein the step of determining the relationship between the point of the point cloud and the parallel plane by calculating the normal angle between the vector formed by the point of the point cloud and the vertex of the bounding box model and the parallel plane of the bounding box model is as follows:
s4.1: selecting a vertex in the bounding box model, setting the vertex as a first vertex, and setting three vertexes connected with the vertex as a second vertex, a third vertex and a fourth vertex respectively;
the three pairs of parallel planes of the bounding box model are respectively a pair of parallel x planes, a pair of parallel y planes and a pair of parallel z planes, the first vertex and the second vertex belong to different z planes, the first vertex and the third vertex belong to different y planes, and the first vertex and the fourth vertex belong to different x planes;
s4.2: acquiring the coordinates of the first vertex, the second vertex, the third vertex and the fourth vertex in a robot coordinate system
Figure FDA0002655491140000021
S4.3: calculating the vector v of the second vertex and the first vertex12：
Figure FDA0002655491140000031
Calculating the vector v of the third vertex and the first vertex13：
Figure FDA0002655491140000032
Calculating the vector v of the fourth vertex and the first vertex14：
Figure FDA0002655491140000033
S4.4: v is to be12、v13、v14Multiplying each two by two to respectively obtain a normal vector v of the x plane of the bounding box model under the robot coordinate systemxY normal vector of plane vyNormal vector v of z planez：
vx＝v12×v13；
vy＝v12×v14；
vz＝v13×v14；
S4.5: setting the coordinate of a point A in the point cloud under the robot coordinate system as p15Calculating the vector of the point A and the first vertex:
Figure FDA0002655491140000034
calculate the vector of point a and the second vertex:
Figure FDA0002655491140000035
calculate the vector of point a and the third vertex:
Figure FDA0002655491140000036
calculate the vector of point a and the fourth vertex:
Figure FDA0002655491140000037
s4.6: calculating vxAnd vp1、vp4The dot-product of (a) is,
Figure FDA0002655491140000038
Figure FDA0002655491140000039
if it is
Figure FDA00026554911400000310
And
Figure FDA00026554911400000311
with the same sign, point A is outside the parallel x-plane, if
Figure FDA00026554911400000312
And
Figure FDA00026554911400000313
the opposite sign, point a is in the parallel x plane;
calculating vyAnd vp1、vp3The dot-product of (a) is,
Figure FDA00026554911400000314
Figure FDA00026554911400000315
if it is
Figure FDA00026554911400000316
And
Figure FDA00026554911400000317
with the same sign, point A is outside the parallel y-plane, if
Figure FDA00026554911400000318
And
Figure FDA00026554911400000319
the opposite sign, point A is in the parallel y plane;
calculating vzAnd vp1、vp2The dot-product of (a) is,
Figure FDA0002655491140000041
Figure FDA0002655491140000042
if it is
Figure FDA0002655491140000043
And
Figure FDA0002655491140000044
with the same sign, point A is outside the parallel z-plane, if
Figure FDA0002655491140000045
And
Figure FDA0002655491140000046
opposite sign, point a is in the parallel z-plane.
10. The method for detecting point cloud collision of robot-grabbed scene as claimed in claim 2, wherein in step S5, if the number of points of the point cloud in the N bounding box models is less than a preset threshold, the clamping jaw will not collide with the actual object; otherwise, the jaws may collide with the actual object.
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