阅读说明：本技术 分体式双目摄像头的安装方法及装置 (Installation method and device of split type binocular camera ) 是由 雷馥玥 孙正伟 李英龙 于 2020-11-20 设计创作，主要内容包括：本发明提供一种分体式双目摄像头的安装方法及装置,该安装方法包括：确定车辆的中心对称面；通过位于前挡风玻璃的第一水平仪确定目标水平线；通过位于前挡风玻璃的第二和第三水平仪确定安装特征点；第二和第三水平仪位于中心对称面的两侧,当第二和第三水平仪发出的水平标定线与目标水平线重合,且第二和第三水平仪与中心对称面的距离均为双目摄像头目标基线的一半时,第二和第三水平仪发出的竖直标定线与目标水平线的交点即为安装特征点。本发明可提高双目摄像头的安装精度。(The invention provides a method and a device for installing a split binocular camera, wherein the method for installing the split binocular camera comprises the following steps: determining a central symmetry plane of the vehicle; determining a target horizontal line by a first level gauge located on a front windshield; determining installation characteristic points through a second level gauge and a third level gauge which are positioned on the front windshield; the second level meter and the third level meter are positioned on two sides of the central symmetry plane, and when the horizontal calibration lines sent by the second level meter and the third level meter are overlapped with the target horizontal line and the distances between the second level meter and the central symmetry plane are half of the target base line of the binocular camera, the intersection point of the vertical calibration lines sent by the second level meter and the third level meter and the target horizontal line is the installation characteristic point. The invention can improve the installation precision of the binocular camera.)

1. The mounting method of the split type binocular camera is characterized by comprising the following steps:

determining a central symmetry plane of the vehicle;

determining a target level line by a first level gauge located on a front windshield of the vehicle; when the vertical calibration line sent by the first level meter is coincident with the central symmetry plane, the horizontal calibration line sent by the first level meter is the target horizontal line;

determining installation feature points through a second level gauge and a third level gauge located on the front windshield; the second gradienter and the third gradienter are positioned on two sides of the central symmetry plane; when the horizontal calibration line sent by the second level meter and the third level meter is coincident with the target horizontal line, and the distance between the second level meter and the central symmetry plane and the distance between the third level meter and the central symmetry plane are half of the target base line of the binocular camera, the intersection point of the vertical calibration line sent by the second level meter and the third level meter and the target horizontal line is the installation characteristic point.

2. The installation method of claim 1, wherein after determining the installation feature points, the installation method further comprises: and installing a binocular camera on the installation characteristic points.

3. The mounting method according to claim 1, wherein a calibration ruler is arranged on a station for parking the vehicle, the length of the calibration ruler is equal to the wheel track of the vehicle, two ends of the calibration ruler are aligned with two front wheels of the vehicle, and a photosensitive element is arranged at the midpoint of the calibration ruler;

the step of determining the central symmetry plane comprises: a fourth level gauge located above the calibration scale is operated; when the photosensitive element senses that the fourth level instrument sends out a vertical calibration line, the surface where the fourth level instrument sends out the vertical calibration line is the central symmetry plane.

4. The installation method of claim 3 wherein, in the step of determining a target horizontal line, when the first level emitting vertical calibration line coincides with the fourth level emitting vertical calibration line, the first level emitting horizontal calibration line is the target horizontal line.

5. The method of installation of claim 3, wherein the first level, the second level, the third level, and the fourth level are laser levels.

6. The utility model provides a split type binocular camera's installation device which characterized in that includes:

a central symmetry plane determining component for determining a central symmetry plane of the vehicle;

the first level gauge is arranged at the front windshield of the vehicle; when the vertical calibration line sent by the first level meter is coincident with the central symmetry plane, the horizontal calibration line sent by the first level meter is a target horizontal line;

the second level gauge and the third level gauge are arranged at the front windshield of the vehicle and are positioned on two sides of the central symmetry plane; when the horizontal calibration line sent by the second level meter and the third level meter is coincident with the target horizontal line, and the distance between the second level meter and the central symmetry plane and the distance between the third level meter and the central symmetry plane are half of the target base line of the binocular camera, the intersection point of the vertical calibration line sent by the second level meter and the third level meter and the target horizontal line is the installation characteristic point.

7. The mounting device of claim 6, further comprising: and the mounting assembly is used for mounting the binocular camera on the mounting characteristic points.

8. The mounting apparatus of claim 6, wherein the central symmetry plane determining assembly comprises: the calibration scale is arranged on the station, and the fourth level gauge is positioned above the calibration scale; the length of the calibration ruler is equal to the wheel track of the vehicle, two ends of the calibration ruler are aligned with two front wheels of the vehicle, and a photosensitive element is arranged at the middle point of the calibration ruler; when the photosensitive element senses that the fourth level instrument sends out a vertical calibration line, the surface where the fourth level instrument sends out the vertical calibration line is the central symmetry plane.

9. The mounting apparatus of claim 8 wherein the target horizontal line is the first level's vertical alignment line when the first level's vertical alignment line coincides with the fourth level's vertical alignment line.

10. The mounting device of claim 8, wherein the first level, the second level, the third level, and the fourth level are laser levels.

Technical Field

The invention relates to the field of unmanned driving, in particular to a method and a device for installing a split binocular camera.

Background

With the development of the unmanned technology and the upgrading and updating of the visual recognition technology, more and more unmanned schemes adopt a scheme that a binocular camera is used as a sensor.

Different from a monocular camera which firstly identifies obstacles and then carries out distance measurement, a binocular camera can determine the distance according to parallax calculation of two images. Because the monocular camera adopts the mode of measuring distance after the obstacle identification, a large amount of data training needs to be carried out, and the operation cost can be increased by the collection and the labeling of a large amount of data. Therefore, the method of using the binocular camera for distance measurement has a great cost advantage, and then the binocular-based visual distance measurement and recognition are increasingly and widely applied to the field of unmanned driving.

Based on the characteristics of the binocular camera, the longer the baseline is arranged, the larger the detectable depth value is. At present, the base line of an integrated binocular camera on the market is mostly 12cm, the depth detection distance is about 100m, and the detection distance required by unmanned driving is difficult to meet (at present, the detection distance required by unmanned driving is generally more than 250 m). The method is suitable for unmanned driving scenes such as trucks and the like with large loads and longer braking distance, and the required detection depth distance is longer. Therefore, in order to achieve the requirement of depth detection of 1000m for later iterative update, a binocular camera with a large baseline (up to 1.2m) is currently used.

The binocular camera has higher requirements on the installation consistency of the left camera and the right camera, and the pitch angle, the yaw angle and the height of the wide center are required to be within a very small deviation range. Although the current better calibration procedure can calibrate some angles, there are very high accuracy requirements for factory installation accuracy. Based on the requirement, the binocular cameras with relatively mature small baselines on the market are mostly installed subsequently in the form of left and right camera integrated modules.

However, for a binocular camera which is suitable for a truck and the like and requires a large baseline, due to space limitations of a front windshield and an instrument panel, reduction of view shielding for a driver and reduction of manufacturing cost of a corresponding bracket are considered, and an installation mode of an integrated module which is mature in the market at present is difficult to apply, and only split installation is adopted.

However, the installation of the split binocular camera needs to consider the problem of the installation accuracy as described above. That is, how to reduce the installation accuracy error of the split binocular camera is a technical problem to be solved urgently.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and an apparatus for mounting a split binocular camera, which can improve the mounting accuracy of the binocular camera.

In order to achieve the above object, the present invention provides the following technical solutions.

A method for installing a split binocular camera comprises the following steps:

determining a central symmetry plane of the vehicle;

determining a target level line by a first level meter located on a front windshield of a vehicle; when the vertical calibration line sent by the first level meter is coincident with the central symmetry plane, the horizontal calibration line sent by the first level meter is the target horizontal line;

determining installation feature points through a second level gauge and a third level gauge located on the front windshield; the second gradienter and the third gradienter are positioned on two sides of the central symmetry plane; when the horizontal calibration line sent by the second level meter and the third level meter is coincident with the target horizontal line, and the distance between the second level meter and the central symmetry plane and the distance between the third level meter and the central symmetry plane are half of the target base line of the binocular camera, the intersection point of the vertical calibration line sent by the second level meter and the third level meter and the target horizontal line is the installation characteristic point.

Preferably, after determining the installation feature points, the installation method further includes: and installing a binocular camera on the installation characteristic points.

Preferably, a calibration ruler is arranged on a station for parking the vehicle, the length of the calibration ruler is equal to the wheel track of the vehicle, two ends of the calibration ruler are aligned with two front wheels of the vehicle, and a photosensitive element is arranged at the middle point of the calibration ruler;

the step of determining the central symmetry plane comprises: a fourth level gauge located above the calibration scale is operated; when the photosensitive element senses that the fourth level instrument sends out a vertical calibration line, the surface where the fourth level instrument sends out the vertical calibration line is the central symmetry plane.

Preferably, in the step of determining the target horizontal line, when the vertical calibration line sent by the first level meter coincides with the vertical calibration line sent by the fourth level meter, the horizontal calibration line sent by the first level meter is the target horizontal line.

Preferably, the first level, the second level, the third level and the fourth level are all laser levels.

A split binocular camera mounting apparatus, comprising:

a central symmetry plane determining component for determining a central symmetry plane of the vehicle;

the first level gauge is arranged at the front windshield of the vehicle; when the vertical calibration line sent by the first level meter is coincident with the central symmetry plane, the horizontal calibration line sent by the first level meter is a target horizontal line;

the second level gauge and the third level gauge are arranged at the front windshield of the vehicle and are positioned on two sides of the central symmetry plane; when the horizontal calibration line sent by the second level meter and the third level meter is coincident with the target horizontal line, and the distance between the second level meter and the central symmetry plane and the distance between the third level meter and the central symmetry plane are half of the target base line of the binocular camera, the intersection point of the vertical calibration line sent by the second level meter and the third level meter and the target horizontal line is the installation characteristic point.

Preferably, the method further comprises the following steps: and the mounting assembly is used for mounting the binocular camera on the mounting characteristic points.

Preferably, the central symmetry plane determining assembly comprises: the calibration scale is arranged on the station, and the fourth level gauge is positioned above the calibration scale; the two ends of the calibration ruler are aligned with the two front wheels of the vehicle, and a photosensitive element is arranged at the middle point of the calibration ruler; when the photosensitive element senses that the fourth level instrument sends out a vertical calibration line, the surface where the fourth level instrument sends out the vertical calibration line is the central symmetry plane.

Preferably, when the vertical calibration line sent by the first level meter coincides with the vertical calibration line sent by the fourth level meter, the horizontal calibration line sent by the first level meter is the target horizontal line.

Preferably, the first level, the second level, the third level and the fourth level are all laser levels.

By means of the technical scheme, the invention has the beneficial effects that:

the installation method and the installation device of the split binocular camera provided by the embodiment of the invention can improve the installation precision of the binocular camera. Practice proves that when the installation method of the embodiment of the invention is adopted to install the binocular camera, the included angle between the camera and the ground relative to the optical center connecting line is less than 0.2 degree, and the error of the installation height of the left camera and the right camera is less than 2 mm. Moreover, the consistency of the mounting positions of the binocular camera support relative to the front windshield is not influenced by the mounting consistency of the whole vehicle, so that the front-looking binocular camera with the large base line can be accurately mounted.

Drawings

Fig. 1 is a schematic structural view of a split binocular camera according to an embodiment of the present invention applied to a truck;

fig. 2 is a flowchart of an installation method of a split binocular camera according to an embodiment of the present invention.

Detailed Description

The invention discloses a split binocular camera mounting method and a device for implementing the mounting method. As shown in fig. 1 and 2, the mounting device includes: a central symmetry plane determining assembly for determining a central symmetry plane of a vehicle, a first level 1, a second level 2 and a third level 3.

In an alternative embodiment, the mounting device further comprises a station for parking the vehicle. When the vehicle needs to install the binocular camera, the vehicle drives in and parks on the station, and the setting of station makes when the installation binocular camera, and the vehicle is located and predetermines the position. The central symmetry plane determining assembly comprises a calibration scale 8 arranged on the station and a fourth level 4 located above the calibration scale 8. In this embodiment, the calibration ruler 8 is specially made for a vehicle to be equipped with a binocular camera, the length of the calibration ruler is equal to the wheel track of the vehicle, and a photosensitive element such as an LED strip is arranged at the midpoint position. When the vehicle enters the station, the two ends of the calibration ruler 8 are aligned with the two front wheels of the vehicle. The fourth level 4 may be a laser level and may emit a horizontal calibration line and a vertical calibration line 5 perpendicular to each other. When the photosensitive element senses that the fourth level device 4 emits the vertical calibration line 5, the photosensitive element emits light, and a plane where the vertical calibration line 5 emitted by the fourth level device 4 is located is a central symmetry plane. The central symmetry plane passes through the front windshield of the vehicle.

The first level meter 1 is arranged at the front windscreen of the vehicle for determining a target level 9. The first level meter 1 may also be a laser level meter, and when the vertical calibration line sent by the first level meter 1 coincides with the central symmetry plane, specifically, when the vertical calibration line sent by the first level meter 1 coincides with the vertical calibration line sent by the fourth level meter 4, the horizontal calibration line sent by the first level meter 1 is the target horizontal line 9. The target horizontal line 9 may be set as a height position line of the left and right cameras of the split type binocular camera.

The second level 2 and the third level 3 are arranged at the front windshield of the vehicle and are positioned on both sides of the central symmetry plane. The second level 2 and the third level 3 may also be laser levels, when the horizontal calibration lines sent by the second level 2 and the third level 3 coincide with the horizontal calibration line sent by the first level 1, that is, the target horizontal line 9 (that is, the second level 2, the third level 3 and the first level 1 are located at the same height), and the distance between the second level 2 and the central symmetry plane and the distance between the third level 3 and the central symmetry plane are both half of the target baseline of the binocular camera (that is, the distances between the second level 2 and the third level 3 and the first level 1 are equal to each other and are both equal to each other), the intersection points of the vertical calibration lines 7 and 6 sent by the second level 2 and the third level 3 and the target horizontal line 9 are installation feature points. The number of mounting features is two, one on each side of the central symmetry plane, i.e. substantially where the second level 2 and the third level 3 are located.

In this embodiment, the target baseline may be set according to actual conditions, which is not limited in this embodiment. For example, in one particular embodiment, the target baseline is 1.2m, and the distance between the second 2, third 3 and first 1 levels is 600 mm.

After the installation characteristic points are determined, the left camera and the right camera of the binocular camera can be installed on the installation characteristic points. Wherein, the installation of binocular camera can be for artificial manual installation. Of course, the mounting device of this embodiment may further include a mounting assembly for mounting the binocular camera on the mounting feature point, and the mounting assembly may be a mechanical arm, so as to implement automatic mounting of the binocular camera.

In some embodiments, the level may be a laser level, and in other embodiments, the level may be an infrared level, an ultrasonic level, or other level, for example.

Based on the installation device, the installation method of the split binocular camera provided by the embodiment of the invention comprises the following steps:

step S10: determining a central symmetry plane of the vehicle;

step S20: the target level 9 is determined by a first level meter 1 located on the front windshield of the vehicle. When the vertical calibration line sent by the first level meter 1 coincides with the central symmetry plane, the horizontal calibration line sent by the first level meter 1 is the target horizontal line 9;

step S30: the installation feature points are determined by the second level 2 and the third level 3 located in the front windshield. The second gradienter 2 and the third gradienter 3 are positioned at two sides of the central symmetry plane; when the horizontal calibration line sent by the second level instrument 2 and the third level instrument 3 coincides with the target horizontal line 9, and the distance between the second level instrument 2 and the central symmetry plane and the distance between the third level instrument 3 and the central symmetry plane are half of the target base line of the binocular camera, the intersection point of the vertical calibration line sent by the second level instrument 2 and the third level instrument 3 and the target horizontal line 9 is the installation characteristic point.

After the installation feature points are determined, the installation method further includes step S40: and installing the binocular camera on the installation characteristic points.

Bearing the above description, a station for parking the vehicle is provided with a calibration ruler 8, the length of the calibration ruler 8 is equal to the wheel track of the vehicle, and when the vehicle drives into the station, two ends of the calibration ruler 8 are aligned with two front wheels of the vehicle. The light-sensitive element is arranged at the middle point of the calibration scale 8. The step of determining the central symmetry plane comprises: the fourth level 4, which is located above the scale 8, is operated. When the photosensitive element senses that the fourth level gauge 4 sends out a vertical calibration line, the plane where the fourth level gauge 4 sends out the vertical calibration line is the central symmetry plane.

In the step of determining the target horizontal line 9, when the vertical calibration line emitted by the first level meter 1 coincides with the vertical calibration line emitted by the fourth level meter 4, the horizontal calibration line emitted by the first level meter 1 is the target horizontal line 9.

When the installation method of the split binocular camera provided by the embodiment of the invention is utilized, the fourth level 4 is arranged at a specific height value, so that the vertical calibration line sent by the fourth level can be shot on the ground, the centering is confirmed through the calibration ruler 8, and the driving of a vehicle is not influenced. The second level 2 is centered at a particular height offset from the fourth level 4 and emits a vertical alignment line parallel to the vertical alignment line emitted by the fourth level 4. The third level 3 is horizontally offset from the second level 2 by half the base line and emits a horizontal calibration line which coincides with the horizontal calibration line emitted by the first level 1. After the horizontal height of the second level meter 2 is confirmed to be accurate and have no deflection angle, the plane formed by the vertical calibration line sent by the second level meter can be ensured to be parallel to the central symmetry plane of the vehicle. The plane offset distances from the second level gauge 2 and the third level gauge 3 to the central symmetry plane of the vehicle can be automatically set to be half of the base line, and the intersection points of the horizontal calibration line sent by the second level gauge 2 and the third level gauge 1 are respectively the installation characteristic points of the left camera and the right camera, so that the left camera and the right camera are positioned. The horizontal calibration line sent by the first level meter 1 coincides with the markers on the left side and the right side of the front windshield, and the vertical calibration line sent by the first level meter 1 coincides with the markers on the upper side and the lower side of the front windshield, so that the windshield can be accurately installed simultaneously.

The installation method of the embodiment of the invention is not only suitable for installation of the split binocular camera, but also suitable for precise installation of other split sensors to the front windshield and a detection procedure of the precise installation.

If the binocular camera needs accurate distance measurement, the installation of the left camera and the right camera has very high requirements. The front windshield of a commercial vehicle is not hand mounted, and therefore, creates some consistency problems. The mounting method can ensure that the front windshield is mounted with very high precision. This is unacceptable for a binocular camera because if the front windshield is fitted with a 0.5 degree error, an error in height of 10.5mm would occur with a 1.2m long baseline. Practice proves that the installation method of the embodiment of the invention is adopted to install the front windshield and the binocular camera, the included angle between the camera and the ground relative to the optical center connecting line is less than 0.2 degree, and the error of the installation height of the left camera and the right camera is less than 2 mm. Moreover, the consistency of the mounting positions of the binocular camera support relative to the front windshield is not influenced by the mounting consistency of the whole vehicle, so that the front-looking binocular camera with the large base line can be accurately mounted.

It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.