System for calibrating a motor vehicle driver assistance system comprising an optical device and a calibration device

Abstract

The invention relates to an optical measurement system (12, 12a, 12b) which can be mounted on various types of calibration devices (2, 2a, 2b) for motor vehicle driver assistance systems (20), said system comprising: a mechanical connection device (16, 16a, 16b) which is designed to mechanically connect the optical measurement system (12, 12a, 12b) to a calibration device (2, 2a, 2b); and an identification interface (28, 28a, 28b) which allows the optical measurement system (12, 12a, 12b) to determine the type of calibration device (2, 2a, 2b) on which the optical measurement system (12, 12a, 12b) is mounted.

Description

[0001] Description

[0002] title

[0003] System for calibrating a vehicle driver assistance system with an optical device and a calibration device

[0004] The invention relates to an optical measuring system and a calibration device for calibrating driver assistance systems in motor vehicles, which are referred to below as motor vehicle driver assistance systems.

[0005] State of the art

[0006] Calibration devices are used, particularly in workshops, to calibrate sensors of driver assistance systems installed in motor vehicles. These calibration devices each have at least one measuring plate with at least one predefined optical pattern, which is detected by a sensor of a motor vehicle driver assistance system to be calibrated in order to calibrate the sensor.

[0007] To calibrate the sensor with the required accuracy, the position and orientation of the measuring plate relative to the motor vehicle must be known with high precision. Calibration devices therefore often have optical measuring systems designed to optically detect a motor vehicle arranged in front of the calibration device in order to determine the position and orientation of the motor vehicle relative to the calibration device, and thus also relative to a measuring plate attached to the calibration device.

[0008] Due to the accuracy required, the optical measuring systems designed to determine the position and / or orientation of the motor vehicle relative to the calibration device are complex and expensive.

[0009] Different calibration devices are often used for different sensors that, for example, monitor different areas of the vehicle's environment and / or that are based on different technologies.

[0010] It is therefore an object of the invention to reduce the costs for calibration devices which are provided for calibrating motor vehicle driver assistance systems, in particular for calibrating the sensors of motor vehicle driver assistance systems, and which are equipped with optical measuring systems.

[0011] The solution to the problem according to the invention comprises providing an optical measuring system for a calibration device for calibrating motor vehicle driver assistance systems, in particular for calibrating the sensors of motor vehicle driver assistance systems, which can be combined with various calibration devices.

[0012] An optical measuring system according to the invention, which can be combined with various calibration devices, which can in particular be mounted on various types of calibration devices for motor vehicle driver assistance systems, comprises a mechanical connecting device which is designed to mechanically connect the optical measuring system to a calibration device, and an identification interface which enables the optical measuring system to determine the type of calibration device on which the optical measuring system is mounted.

[0013] The invention also encompasses a calibration device for calibrating motor vehicle driver assistance systems, in particular for calibrating the sensors of motor vehicle driver assistance systems, comprising a mechanical connection device designed to mechanically connect the calibration device to an optical measuring system designed according to the invention. The calibration device further comprises an identification interface designed to interact with an identification interface of an optical measuring system designed according to the invention, which is mechanically connected to the calibration device, in order to enable the optical measuring system to determine the type of calibration device.

[0014] The invention also encompasses a system for calibrating motor vehicle driver assistance systems, in particular for calibrating the sensors of motor vehicle driver assistance systems, wherein the system comprises at least two different calibration devices designed according to the invention and at least one optical measuring system designed according to the invention. The identification interfaces of the at least two calibration devices are designed such that they enable the at least one optical measuring system to distinguish between the at least two different calibration devices.

[0015] The invention further comprises a method for calibrating motor vehicle driver assistance systems, in particular for calibrating the sensors of motor vehicle driver assistance systems, using a calibration device according to the invention and an optical measuring system according to the invention. The method comprises mechanically connecting the optical measuring system to the calibration device using the mechanical connection device, identifying the calibration device to which the optical measuring system is connected using the identification interface of the optical measuring system and the identification interface of the calibration device, and determining the position of a motor vehicle positioned in front of the calibration device using the optical measuring system.

[0016] The invention enables an optical measuring system, which is designed for mounting on a calibration device for calibrating motor vehicle driver assistance systems, to independently and unambiguously determine on which type of calibration device the optical measuring system is mounted.

[0017] This information can be taken into account when evaluating the images of the motor vehicle taken by the optical measuring system in order to be able to determine the position and orientation of the calibration device relative to the motor vehicle with high accuracy using the taken images.

[0018] An optical measuring system designed according to the invention can therefore be flexibly combined with different types of calibration devices.

[0019] A system according to the invention for calibrating a motor vehicle driver assistance system, which comprises several calibration devices that enable the calibration of different sensors or sensor types of motor vehicle driver assistance systems, can thus be operated with a single optical measuring system, or with a single pair of optical measuring systems, which can be alternately attached to different calibration devices. The effort and costs for providing a system for calibrating motor vehicle driver assistance systems with different sensors can thus be significantly reduced compared to conventional systems in which each of the calibration devices is equipped with its own optical measuring system, which is permanently installed on the respective calibration device.

[0020] In one embodiment, the identification interface comprises an electrical interface that enables the optical measuring system to electrically determine the type of calibration device to which the optical measuring system is mounted.

[0021] In one embodiment, the identification interface of a calibration device according to the invention is an electrical interface designed to interact with a corresponding electrical identification interface formed on an optical measuring system that is mechanically connected to the calibration device.

[0022] Identification interfaces and identification interfaces designed as electrical interfaces make it possible to implement a reliable combination of identification interface and corresponding identification interface at low cost.

[0023] In one embodiment, the electrical interface comprises a plurality of electrical contacts, and the optical measuring system is configured to identify the type of calibration device to which the optical measuring system is mounted based on electrical connections established between the electrical contacts by the calibration device's identification interface. An electrical interface comprising a plurality of electrical contacts enables a reliable combination of identification interface and identification interface to be implemented at low cost.

[0024] In one embodiment, the identification interface has at least one electrical connector designed to electrically connect at least two electrical contacts of the identification interface. By selectively connecting electrical contacts of the identification interface, different types of calibration devices can be easily encoded in the identification interface.

[0025] In one embodiment, the optical measuring system comprises at least one sensor configured to detect an electrical voltage applied to at least one of the electrical contacts or an electrical current flowing through at least two of the electrical contacts in order to electrically determine the type of calibration device on which the optical measuring system is mounted.

[0026] In one embodiment, the electrical contacts are arranged in a matrix or along a polygon.

[0027] An embodiment of the invention is described below with reference to the accompanying figures.

[0028] Short description of the characters

[0029] Figure 1 shows a schematic representation of a plan view of a measuring station with a motor vehicle and a calibration device according to the invention.

[0030] Figure 2 shows a perspective front view of a calibration device designed according to an embodiment of the invention.

[0031] Figure 3A shows a fastening device according to the invention with a mechanical connecting device and an identification interface.

[0032] Figure 3B shows a schematic representation of an embodiment of an optical measuring system.

[0033] Figure 4A shows a schematic representation of a first embodiment of an identification interface according to the invention.

[0034] Figure 4B shows a schematic representation of a second embodiment of an identification interface according to the invention. Figure 4C shows a schematic representation of a third embodiment of an identification interface according to the invention.

[0035] Figure 1 shows a schematic plan view of a measuring station 1 with a motor vehicle 18 which is equipped with a motor vehicle driver assistance system 20. The motor vehicle driver assistance system 20 is equipped with a first, forward-looking sensor 22a and with a second, rearward-looking sensor 22b.

[0036] The two sensors 22a, 22b can be, for example, optical sensors ("image capture devices" or cameras), radar sensors, or laser sensors ("LIDAR sensors"). The two sensors 22a, 22b can be the same type of sensor, e.g., both optical sensors or radar sensors, or different types of sensors, e.g., an optical sensor and a radar sensor.

[0037] The vehicle driver assistance system 20 can also be equipped with more than two sensors 22a, 22b.

[0038] A first calibration device 2a is positioned in front of the motor vehicle 18 and is provided for calibrating the forward-facing first sensor 22a.

[0039] The first calibration device 2a comprises a calibration board 8a with an optical pattern (see Figure 2) that can be optically detected by the first sensor 22a in order to calibrate the motor vehicle driver assistance system 20 and in particular the first sensor 22a.

[0040] A second calibration device 2b is positioned diagonally behind the motor vehicle 18 and is provided for calibrating the rearward-facing second sensor 22b.

[0041] In the embodiment shown in Figure 1, the second calibration device 2b also includes a calibration plate 8b. The calibration plate 8b of the second calibration device 2b may differ from the calibration plate 8a of the first calibration device 2a. For example, a different optical pattern may be formed on the calibration plate 8b of the second calibration device 2b than on the calibration plate 8b of the second calibration device 2b.

[0042] The second calibration device 2b can also be constructed differently than the first calibration device 2b. For example, the first calibration device 2a can be designed to calibrate an optical sensor 22a, and the second calibration device 2b can be designed to calibrate a radar sensor 22b or a LIDAR sensor 22b, or vice versa.

[0043] The first calibration device 2a and the second calibration device 2b are each equipped with two optical measuring systems (OMS) 12a, 12b, which are designed to optically detect a motor vehicle 18 arranged in front of the respective calibration device 2a, 2b in order to be able to determine the position of the respective calibration device 2a, 2b with respect to the motor vehicle 18.

[0044] Figure 2 shows a perspective front view of a calibration device 2a, which is designed according to an embodiment of the invention.

[0045] The calibration device 2a comprises a frame 6 supported on several rollers 4, to which the calibration board 8a is attached. Brakes (not shown in Figure 2) can be provided on the rollers 4. The brakes can be activated to prevent the calibration device 2a from accidentally rolling away after the calibration device 2a has been positioned in front of the motor vehicle 18.

[0046] An optical pattern is formed on the calibration board 8a, which is intended to be optically detected by an optical sensor 22a of the motor vehicle driver assistance system 20 in order to enable the optical sensor 22a of the motor vehicle driver assistance system 20 to be calibrated.

[0047] The specific design of the calibration panel 8a shown in Figure 2, and in particular the optical pattern formed on the calibration panel 8a, are only examples. Depending on the requirements of the vehicle driver assistance system 20 to be calibrated, other patterns can also be formed on the calibration panel 8a and / or the calibration panel 8a can be designed to reflect the radar radiation of a radar sensor 22a or the laser radiation of a LIDAR sensor 22a.

[0048] Depending on the position and functioning of the sensor 22a to be calibrated, the calibration board 8a can also be mounted in a different position, in particular in a lower position, on the frame 6 of the calibration device 2a.

[0049] A holding device 10 is mounted on the frame 6 below the calibration panel 8a. In other embodiments not explicitly shown in the figures, the holding device 10 can also be arranged above the calibration panel 8a or behind the calibration panel 8a.

[0050] The holding device 10 can be made of metal or plastic.

[0051] The holding device 10 can in particular comprise a profile made of metal or plastic.

[0052] The holding device 10 extends in a bar-like manner along an axis A in a horizontal direction parallel to the plane of the calibration plate 8a from left to right. As shown in Figures 1 and 2, the holding device 10 extends, in particular, beyond the lateral edges of the calibration plate 8.

[0053] An optical measuring system 12a, 12b is provided in or on the two outer end regions 10a, 10b of the holding device 10.

[0054] The optical measuring systems 12a, 12b are designed to capture images of the motor vehicle 18 located in front of the calibration device 2. The optical measuring systems 12a, 12b can, for example, each comprise mono or stereo cameras. The cameras can be configured as black-and-white cameras or as color cameras.

[0055] The optical measuring systems 12a, 12b or cameras can be designed to record light in the visible range and / or to record light in the infrared range.

[0056] The distance L between the two optical measuring systems 12a, 12b in the horizontal direction is preferably greater than the maximum width B of the motor vehicles 18 whose vehicle driver assistance systems 20 can be calibrated with the aid of the calibration device 2.

[0057] The distance L between the two optical measuring systems 12a, 12b can, for example, be in the range between 180 cm and 300 cm.

[0058] The images recorded by the optical measuring systems 12a, 12b are transmitted wirelessly or by wire to an evaluation device 14, which is designed to evaluate the images transmitted by the optical measuring systems 12a, 12b in order to determine the position and / or orientation of the calibration device 2a with respect to the motor vehicle 18.

[0059] The evaluation device 14 can be designed separately from the optical measuring systems 12a, 12b, as shown in Figure 2. The evaluation device 14 can also be integrated into at least one of the two optical measuring systems 12a, 12b.

[0060] In order to be able to attach and operate the optical measuring systems 12a, 12b selectively to different calibration devices 2a, 2b, the optical measuring systems 12a, 12b are attached to the respective calibration device 2a, 2b by means of detachable fastening devices 16a, 16b.

[0061] The fastening devices 16a, 16b each comprise an easily detachable mechanical connecting device 26a, 26b, which makes it possible to attach and fasten the respective optical measuring system 12a, 12b securely but easily detachably to the respective calibration device 2a, 2b, in particular to the holding device 10 of the respective calibration device 2a, 2b.

[0062] The mechanical connecting devices 26a, 26b can, for example, be designed to form a positive connection between the respective optical measuring system 12a, 12b and the holding device 10 of the respective calibration device 2a, 2b.

[0063] The mechanical connecting devices 26a, 26b may also include locking mechanisms, e.g., locking lugs, which allow the optical measuring systems 12a, 12b to be securely locked to the holding device 10. Figure 3A shows an exemplary embodiment of a fastening device 16 according to the invention with a mechanical connecting device 26 and an identification interface 28 having two electrical contacts 30, 32.

[0064] In the embodiment shown in Figure 3A, the mechanical connecting device 26 is designed in a bayonet-like manner. An optical measuring system 12 (not shown in Figure 3A) which is equipped with such a mechanical connecting device 26 can be fastened in a rotational movement to a corresponding mechanical connecting device which is formed on the holding device 10 of a calibration device 2a.

[0065] The embodiment of a fastening device 16 shown in Figure 3A is merely exemplary. The fastening device 16 can also be constructed differently. The mechanical connecting device 26 of the fastening device 16 can, in particular, be constructed such that the optical measuring system 12 can be secured in a linear movement of the holding device 10.

[0066] The mechanical connecting device 26 can also be designed with at least one electromagnet and / or with at least one permanent magnet in order to enable the optical measuring system 12 to be fastened to the holding device 10 by means of magnetic force.

[0067] When the optical measuring system 12 is properly attached to the holding device 10 by means of the fastening device 16, the electrical contacts 30, 32 of the identification interface 28 are in electrical contact with corresponding electrical contacts 34a-34c, 36a-36c of an identification interface 29a-29c (not shown in Figure 3A) formed on the holding device 10. Various examples of identification interfaces 29a-29c are shown in Figures 4A-4C.

[0068] The configuration of the identification interface 29a-29c is characteristic of the respective calibration device 2a, 2b. The interaction of the identification interface 28 of the optical measuring system 12 with the identification interface 29a-29c formed on the holding device 10 of the calibration device 2a, 2b therefore enables the optical measuring system 12 to uniquely identify the calibration device 2a, 2b to which it is attached.

[0069] Figure 3B shows, in a simple schematic representation, an embodiment of an optical measuring system 12 with two mechanical connecting devices 26a, 26b, which are designed to mechanically connect the optical measuring system 12 to the holding device 10 of a calibration device 2a, 2b and to securely fix it to the holding device 10.

[0070] The optical measuring system 12 also includes an image recording device or camera 15 and an evaluation device 14 for evaluating the images recorded by the image recording device or camera 15.

[0071] An identification interface 28 is also formed on the optical measuring system 12. The identification interface 28 interacts with a corresponding identification interface 29a-29c (see Figures 4A-4C) formed on the holding device 10 to enable the measuring system 12 to uniquely identify the calibration device 2a, 2b or the type of calibration device 2a, 2b to which the optical measuring system 12 is attached.

[0072] The interaction of the identification interfaces 28 with the identification interface 29a-29c enables the measuring system 12, for example, to determine whether it is attached to a (first) calibration device 2a intended for calibrating a forward-facing sensor 22a, or whether it is attached to a (second) calibration device 2b intended for calibrating a rear-facing sensor 22b.

[0073] The interaction of the identification interfaces 28 with the identification interface 29a-29c can also enable the measuring system 12 to distinguish between calibration devices 2a, 2b that are designed to calibrate optical sensors 22a, 22b, to calibrate radar sensors 22a, 22b, or to calibrate LIDAR sensors 22a, 22b.

[0074] In the embodiment shown in Figure 3B, the identification interface 28 is equipped with six electrical contacts 30a-30c, 32a-32c, in particular with three electrical output contacts 30a-30c and with three electrical input contacts 32a-32c.

[0075] The electrical contacts 30a-30c, 32a-32c are connected to the evaluation device 14 by electrical lines 25. The electrical contacts 30a-30c, 32a-32c can be designed, for example, as contact pins, contact sockets, or contact surfaces.

[0076] The electrical output contacts 30a-30c are connected to an electrical voltage source 33, which applies an electrical voltage to the output contacts 30a-30c. The electrical voltage applied to the output contacts 30a-30c can be a direct voltage or an alternating voltage. The electrical voltage can be an electrical voltage in the range between 5 V and 24 V, in particular an electrical voltage in the range between 10 V and 12 V.

[0077] The input contacts 32a-32c are each connected to an electrical sensor 35a-35c, which is designed to detect a voltage applied to the input contacts 32a-32c and / or an electrical current flowing through the input contacts 32a-32c in order to identify the calibration device 2a, 2b to which the optical measuring system 12 is connected.

[0078] Figures 4A to 4C show three different examples of identification interfaces 29a-29c, each designed to interact with an identification interface 28 as shown in Figure 3B.

[0079] Each of the identification interfaces 29a-29c also has six electrical contacts 34a-34c, 36a-36c, which are designed to contact the electrical contacts 30a-30c, 32a-32c of the identification interface 28 when an optical measuring system 12, 12a, 12b is attached to a calibration device 2a, 2b.

[0080] In a first embodiment, shown in Figure 4A, the two contacts 34a, 36a of a first contact pair of the identification interface 29a are electrically connected to one another by an electrical connection 38a. This results in the voltage of the voltage source 33 being detected at the first input contact 32b of the identification interface 28, or a current flowing through the first input contact 32b of the identification interface 28 being measured when the identification interface 29a shown in Figure 4A is connected to the identification interface 28.

[0081] The contacts 34a, 34c, 36b, 36c of the second and third contact pairs of the identification interface 29a are not electrically connected to each other. As a result, no voltage is detected at the second input contact 32b and the third input contact 32c of the identification interface 28, and no current flows through the second input contact 32b and the third input contact 32c of the identification interface 28 when the identification interface 29a shown in Figure 4A is connected to the identification interface 28.

[0082] In a second embodiment of an identification interface 29a, shown in Figure 4B, the two contacts 34b, 36b of the second contact pair of the identification interface 29 are electrically connected to one another by an electrical connection 38b. This results in the voltage of the voltage source 33 being detected at the second input contact 32b of the identification interface 28, or a current flowing through the first input contact 32b of the identification interface 28 being measured when the identification interface 29b shown in Figure 4B is connected to the identification interface 28.

[0083] The contacts 34a, 34c, 36a, 36c of the first contact pair and the third contact pair of the identification interface 29b are not electrically connected to one another in the second exemplary embodiment of the identification interface 29b shown in Figure 4B. As a result, no voltage is detected at the first input contact 32a and the third input contact 32c of the identification interface 28, and no current flows through the first input contact 32b and the third input contact 32c of the identification interface 28 when the identification interface 29b shown in Figure 4B is connected to the identification interface 28.

[0084] In a third embodiment of an identification interface 29c, shown in Figure 4C, both the two contacts 34a, 34b of the first contact pair and the two contacts 36a, 36b of the second contact pair of the identification interface 29c are electrically connected to each other by electrical connections 38a, 38b. The two contacts 36a, 36b of the third contact pair of the identification interface 29c are not connected to each other.

[0085] This results in the voltage of the voltage source 33 being detected at both the first input contact 32a and the second input contact 32b of the identification interface 28, or a current flowing through both the first input contact 32a and the second input contact 32b when the identification interface 29c shown in Figure 4C is electrically connected to the identification interface 28.

[0086] The three differently designed identification interfaces 29a-29c, which are shown in Figures 4A to 4C, can thus be differentiated from one another and each uniquely identified by measuring the voltages at the input contacts 32a-32c of the identification interface 28 and / or by measuring the currents flowing through the input contacts 32a-32c of the identification interface 28.

[0087] If each of the three identification interfaces 29a-29c is assigned to a type of calibration device 2a, 2b, three different types of calibration devices 2a, 2b can be distinguished from one another and each uniquely identified.

[0088] By additionally selectively connecting the contacts 34c, 36c of the third contact pair, further identification interfaces 29a-29c and calibration devices 2a, 2b connected to these identification interfaces 29a-29c can be identified and distinguished from one another.

[0089] In further embodiments, which are not explicitly shown in the figures, further contact pairs can be formed on the identification interface 28 and on the identification interfaces 29a-29c, which make it possible to distinguish an even larger number of different identification interfaces 29a-29c from one another.

[0090] The contacts 30a-30c, 32a-32c, 34a-34c, 36a-36c may be arranged in a rectangular matrix as shown in Figures 3B and 4A to 4C.

[0091] However, the arrangement of contacts 30a-30c, 32a-32c, 34a-34c, 36a-36c in a rectangular matrix shown in Figures 3B and 4A to 4C is only exemplary. In other embodiments not explicitly shown in the figures, contacts 30a-30c, 32a-32c, 34a-34c, 36a-36c can also be arranged in other arrangements or patterns.

[0092] An optical measuring system 12, 12a, 12b equipped with an identification interface 28 according to the invention can unambiguously identify a corresponding identification interface 29a-29c connected to the identification interface 28 by detecting and evaluating the electrical voltages applied to the input contacts 32a-32c of the identification interface 28 or the electrical currents flowing through the electrical contacts 30a-30c, 32a-32c of the identification interface 28.

[0093] In this way, the optical measuring system 12, 12a, 12b can clearly determine which type of calibration device 2a, 2b it is mounted on. This information can be taken into account when evaluating the images of the motor vehicle 18 captured by the optical measuring system 12, 12a, 12b in order to determine the position and orientation of the calibration device 2a, 2b relative to the motor vehicle 18 with high accuracy.

[0094] An optical measuring system 12, 12a, 12b equipped with an identification interface 28 according to the invention can therefore be used flexibly in combination with different types of calibration devices 2a, 2b.

[0095] A system for calibrating a motor vehicle driver assistance system 20 with various sensors 22a, 22b, which comprises a plurality of calibration devices 2a, 2b which are differently designed and are provided for calibrating the various sensors 22a, 22b or sensor types of a motor vehicle driver assistance system 20, can therefore be operated with a single optical measuring system 12, or with a single pair of optical measuring systems 12a, 12b, wherein the optical measuring system 12, 12a, 12b, or the pair of optical measuring systems 12a, 12b, can be alternately attached to different calibration devices 2a, 2b.

[0096] The effort and costs for providing a system with multiple calibration devices 2a, 2b for calibrating a motor vehicle driver assistance system 20, which comprises multiple sensors 22a, 22b, can thus be significantly reduced compared to a conventional system in which each of the calibration devices 2a, 2b is equipped with its own optical measuring systems 12, 12a, 12b permanently installed on the respective calibration device 2a, 2b.

Claims

1. An optical measuring system (12, 12a, 12b) that can be mounted on various types of calibration devices (2, 2a, 2b) for motor vehicle driver assistance systems (20), the optical measuring system (12, 12a, 12b) comprising: a mechanical connecting device (16, 16a, 16b) designed to mechanically connect the optical measuring system (12, 12a, 12b) to a calibration device (2, 2a, 2b); and an identification interface (28, 28a, 28b) that enables the optical measuring system (12, 12a, 12b) to determine the type of calibration device (2, 2a, 2b) on which the optical measuring system (12, 12a, 12b) is mounted.

2. Optical measuring system (12, 12a, 12b) according to claim 1, wherein the identification interface (28, 28a, 28b) comprises an electrical interface that enables the optical measuring system (12, 12a, 12b) to electrically determine the type of calibration device (2, 2a, 2b) on which the optical measuring system (12, 12a, 12b) is mounted.

3. Optical measuring system (12, 12a, 12b) according to claim 2, wherein the electrical interface comprises a plurality of electrical contacts (30, 30a-30c, 32, 32a-32c), and wherein the optical measuring system (12, 12a, 12b) is designed to identify the type of calibration device (2, 2a, 2b) on which the optical measuring system (12, 12a, 12b) is mounted based on electrical connections (38a-38c) made by the calibration device (2, 2a, 2b) between the electrical contacts (30, 30a-30c, 32, 32a-32c).

4. Optical measuring system (12, 12a, 12b) according to claim 3 with at least one sensor (35a-35c) which is designed to detect an electrical voltage applied to at least one of the electrical contacts (30, 30a-30c, 32, 32a-32c) or an electrical current flowing through at least two of the electrical contacts (30, 30a-30c, 32, 32a-32c).

5. Optical measuring system (12, 12a, 12b) according to claim 3 or 4, wherein the electrical contacts (30, 30a-30c, 32, 32a-32c) are arranged in a matrix, in particular in a rectangular matrix.

6. Calibration device (2, 2a, 2b) for calibrating motor vehicle driver assistance systems (20), comprising: a mechanical connecting device (16, 16a, 16b) designed to mechanically connect the calibration device (2, 2a, 2b) to an optical measuring system (12, 12a, 12b) according to one of claims 1 to 5; and an identification interface (29a-29c) designed to interact with an identification interface (28, 28a, 28b) of an optical measuring system (12, 12a, 12b) that is mechanically connected to the calibration device (2, 2a, 2b) to enable the optical measuring system (12, 12a, 12b) to determine a type of calibration device (2, 2a, 2b).

7. Calibration device (2, 2a, 2b) according to claim 6, wherein the identification interface (29a-29c) is an electrical interface designed to interact with a corresponding electrical identification interface (28, 28a, 28b).

8. Calibration device (2, 2a, 2b) according to claim 7, wherein the identification interface (29a-29c) has at least one electrical connection (38a-38c) which connects at least two electrical contacts (30a-30c, 32a-32c) of the identification interface (28, 28a, 28b) to one another.

9. System for calibrating a motor vehicle driver assistance system (20) with at least two different calibration devices (2, 2a, 2b) according to one of claims 6 to 8, and at least one optical measuring system (12, 12a, 12b) according to one of claims 1 to 5, wherein the identification interfaces (29a-29c) of the at least two different calibration devices (2, 2a, 2b) are designed such that they enable the at least one optical measuring system (12, 12a, 12b) to distinguish the at least two different calibration devices (2, 2a, 2b) from one another.

10. A method for calibrating motor vehicle driver assistance systems (20) with a calibration device (2, 2a, 2b) according to one of claims 6 to 8 and an optical measuring system (12, 12a, 12b) according to one of claims 1 to 5, wherein the method comprises mechanically connecting the optical measuring system (12, 12a, 12b) to the calibration device (2, 2a, 2b) with the aid of the mechanical connecting device (16, 16a, 16b); identifying the calibration device (2, 2a, 2b) to which the optical measuring system (12, 12a, 12b) is connected with the aid of the identification interface (28, 28a, 28b) of the optical measuring system (12, 12a, 12b) and the identification interface (29a, 29c) of the calibration device (2, 2a, 2b); and to determine the position of a motor vehicle (18) positioned in front of the calibration device (2, 2a, 2b) with the aid of the optical measuring system (12, 12a, 12b).

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