Vehicle view blind area measuring device
By simulating the driver's line of sight through the supporting components and projector combination device, the problem of inefficient measurement of blind spots in front of the vehicle in the prior art is solved, and efficient and accurate three-dimensional blind spot measurement is achieved, which is suitable for a variety of vehicle models and reduces costs.
Patent Information
- Application Number
- CN202422292246.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-19
AI Technical Summary
The prior art cannot efficiently and accurately measure the blind spots in front of the vehicle, and the measurement process is cumbersome and inefficient. The seat needs to be removed and there are large errors.
A combination device of support components, eye point simulation components and projectors is used to simulate the driver's line of sight in the vehicle, identify the visual range boundaries, and generate the vehicle's three-dimensional blind spot range through perspective conversion to avoid manual operation.
No need to remove the seats, which improves measurement accuracy and efficiency, reduces economic costs, is suitable for different models and reduces venue demand.
Smart Images
Figure CN223077892U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of road traffic safety, and particularly relates to a measuring device for the visual blind area of a vehicle. Background Art
[0002] The forward field of view of a vehicle driver is an important performance index in the field of active vehicle safety. A good forward field of view of the driver is of great significance for ensuring the driving safety of the vehicle. For the forward visual blind area of a vehicle, especially large and medium-sized vehicles, due to the high cab, large body, and narrow window field of view range, the field of view range of the driver is severely limited. And the accidents caused by the vehicle blind area account for a high proportion every year, and the problem of frequent occurrence of blind area accidents is prominent. During the compulsory certification process of automotive products, the forward field of view performance of M1 category vehicles is one of the items that must be detected. At present, the existing technical solutions cannot directly generate the three-dimensional blind area of the vehicle's forward field of view, and the measurement usually requires removing the vehicle seat, and the operations such as manual measurement and manual marking are cumbersome, error-prone, and have low work efficiency. Summary of the Utility Model
[0003] In view of this, the utility model provides a measuring device for the visual blind area of a vehicle to solve the problems of low efficiency, cumbersome operation, and large error when measuring the visual blind area of a vehicle in the prior art.
[0004] The utility model provides a measuring device for the visual blind area of a vehicle, including: a support assembly, adapted to be arranged above a predetermined measurement position and bent corresponding to the outer peripheral contour of the predetermined measurement position; an eye point simulation assembly, the first end of the eye point simulation assembly is slidably connected with the support assembly, and the second end of the eye point simulation assembly is adapted to extend into the measurement vehicle and is rotatably arranged; a projection member, arranged below the support assembly and detachably connected with the support assembly.
[0005] Beneficial effects: By installing the support assembly at the predetermined measurement position, fixing the projection member on the support assembly, extending the eye point simulation assembly into the eye point position in the measurement vehicle, rotating to simulate different fields of view of the driver's head rotation, and identifying the image to form the boundary of the vehicle visible range, connecting the visible coordinate points in the eye point and the projection member, and obtaining the projection of the visible coordinate points on the ground through perspective transformation, finally forming the three-dimensional blind area range of the vehicle, without removing the vehicle seat, avoiding manual operation, and improving the measurement accuracy and measurement efficiency.
[0006] In an optional embodiment, the eye point simulation assembly includes an adjustable structure and an image acquisition part, the first end of the adjustable structure is slidably connected with the support assembly, the second end of the adjustable structure is rotatably connected with the image acquisition part, and the image acquisition part is rotatably arranged along the horizontal direction.
[0007] In an alternative embodiment, the adjustable structure includes a sliding part and a telescopic part. The first end of the sliding part is slidably connected to the support assembly. The second end of the sliding part extends vertically downward. The first end of the telescopic part is connected to the second end of the sliding part. The second end of the telescopic part extends horizontally and is adapted to be close to the measurement vehicle. The image acquisition part is rotatably connected to the second end of the telescopic part.
[0008] In an alternative embodiment, the support assembly includes a slide table and a support frame. The support frame is disposed below the slide table and connected to the slide table. The projection member is detachably connected to the support frame.
[0009] Beneficial effects: By detachably connecting the projection member to the support frame, it is convenient to quickly replace the projection member, which is beneficial to further improving the measurement efficiency of the vehicle vision blind area measurement device.
[0010] In an alternative embodiment, the vehicle vision blind area measurement device further includes a sliding member. The slide table is provided with a sliding groove. The sliding member is disposed in the sliding groove and slidably connected to the slide table. The first end of the sliding part is slidably connected to the slide table through the sliding member.
[0011] Beneficial effects: By providing the sliding member, the quick movement of the eye point simulation component is realized, which is convenient to adjust the position of the eye point simulation component, and further improves the measurement efficiency of the vehicle vision blind area measurement device.
[0012] In an alternative embodiment, the sliding part further includes a plurality of sliding rods. The plurality of sliding rods are inserted into each other to make the height of the image acquisition part adjustable.
[0013] Beneficial effects: By inserting the sliding rods into each other, the height of the image acquisition part is adjustable, so as to measure the vision blind area of measurement vehicles with different heights, and improve the applicability of the vehicle vision blind area measurement device.
[0014] In an alternative embodiment, the telescopic part includes a plurality of plug-in rods. The plurality of plug-in rods are inserted into each other to make the length of the telescopic part adjustable.
[0015] Beneficial effects: By setting the length of the plug-in part to be adjustable, it can adapt to measurement vehicles with different widths for measurement, and improve the applicability of the vehicle vision blind area measurement device.
[0016] In an alternative embodiment, the vehicle vision blind area measurement device further includes a motor. The motor is drivingly connected to the sliding member.
[0017] Beneficial effects: By controlling the movement of the sliding member with a motor, manpower is further saved and the working efficiency of the vehicle vision blind area measuring device is improved.
[0018] In an alternative embodiment, the adjustable structure further includes a strengthening portion, and the strengthening portion is connected to both the sliding portion and the telescopic portion.
[0019] Beneficial effects: By providing the strengthening portion, the strength and stability of the adjustable structure are further enhanced.
[0020] In an alternative embodiment, the sliding table is adapted to be disposed more than 5 m above the predetermined measurement position.
[0021] Beneficial effects: By disposing the sliding table more than 5 m above the predetermined measurement position, the measurement of the vision blind area of vehicles with different heights is satisfied, and the applicability of the vehicle vision blind area measuring device is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0023] Figure 1 The front view schematic diagram of the vehicle vision blind area measuring device according to the embodiment of the present invention;
[0024] Figure 2 The top view schematic diagram of the vehicle vision blind area measuring device according to the embodiment of the present invention;
[0025] Figure 3 is Figure 1 The partial enlarged schematic diagram of A in
[0026] Figure 4 The connection schematic diagram of the image acquisition part and the telescopic part of the vehicle vision blind area measuring device according to the embodiment of the present invention;
[0027] Figure 5 The working principle schematic diagram of the vehicle vision blind area measuring device according to the embodiment of the present invention.
[0028] Description of the reference numerals:
[0029] 1. Support component; 101. Slide table; 1011. Slide groove; 102. Support frame; 2. Eye point simulation component; 201. Adjustable structure; 2011. Sliding part; 2012. Telescopic part; 2013. Reinforcement part; 202. Image acquisition part; 3. Projection part; 4. Sliding part; 5. Measuring vehicle. Detailed implementation manner
[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0031] In GB11562 "Requirements and Measuring Methods for the Forward Vision of Vehicle Drivers", only the test principles and limits of the forward vision of drivers are specified and required, but the specific test methods and implementation details are not clearly proposed. Moreover, currently, most testing institutions measure the forward vision of vehicle drivers by manually recording the data obtained by three coordinates and calculating test items such as the windshield reference point and the binocular obstacle angle of the A-pillar using a calculator, and then manually filling in the test records and inspection reports; or removing the seat of the existing vehicle, placing the mounting seat, and using a light source to simulate the vision range, but there is no description on how to record and generate the vision range subsequently. In previous studies, there have been few domestic studies on measuring the three-dimensional blind area of the vehicle's forward vision. Some scholars have proposed using a flashlight or a laser pen to draw points on the ground to measure the vision range and construct a three-dimensional blind area. This method requires a relatively large site area and has a low manual measurement efficiency. And the methods used internationally to measure the forward vision (direct vision) of vehicles, such as the measurement method for the three-dimensional blind area of the forward vision in Regulation No. 167 of the United Nations "Regulations on Vehicle Direct Vision", also use manual marking and other methods.
[0032] The following will be combined with Figures 1 to 5 , to describe the embodiments of the present utility model.
[0033] According to an embodiment of the present utility model, as Figure 1 and Figure 2 shown, a vehicle vision blind area measuring device is provided, including: a support component 1, an eye point simulation component 2, and a projection component 3. The support component 1 is adapted to be disposed above a predetermined measurement position and is bent corresponding to the outer peripheral contour of the predetermined measurement position. The first end of the eye point simulation component 2 is slidably connected to the support component 1, and the second end of the eye point simulation component 2 is adapted to extend into the measuring vehicle 5 and is rotatably disposed. The projection component 3 is disposed below the support component 1 and is detachably connected to the support component 1.
[0034] By installing the support assembly 1 at a predetermined measurement position, fixing the projection member 3 on the support assembly 1, and extending the eye point simulation assembly 2 into the eye point position inside the measurement vehicle 5, rotating different fields of view simulating the rotation of the driver's head, and performing image recognition to form the boundary of the vehicle's visible range, connecting the eye point and the visible coordinate points in the grid curtain, and obtaining the projection of the visible coordinate points on the ground through perspective transformation, finally forming the three-dimensional blind area range of the vehicle, without removing the vehicle seat, avoiding manual operation, and improving the measurement accuracy and efficiency.
[0035] Specifically, in this embodiment, the support assembly 1 is bent into a U shape, and the projection member 3 is suspended in a U shape below the support assembly 1, so that the projection member 3 is provided on the left, front, and right of the measurement vehicle 5. The eye point simulation assembly 2 can form a projection on the projection member 3 when rotating in the horizontal direction to fully calculate the blind area of the measurement vehicle 5.
[0036] Specifically, in this embodiment, the projection member 3 is a measurement curtain with a size of 5m * 5m, and a grid with a size of 0.1m * 0.1m and numbers is drawn on the measurement curtain to make the measurement result more accurate.
[0037] In an alternative embodiment, the measurement curtain for position calibration can also be other vertical grid plates. The grid spacing of 0.1m * 0.1m is a recommended spacing and can be adjusted according to actual needs.
[0038] It should be noted that using a light source to simulate the eye point line-of-sight area is a commonly used eye point simulation method in the prior art. However, this method is affected by the quality of the light source and light propagation, and there will often be a certain measurement error. The instability of the light source and the influence of the output efficiency will cause differences in the light intensity of different parts of the light source, thus affecting the accuracy of the measurement result; in addition, when light passes through the vehicle window glass, certain scattering and refraction will occur, and the temperature, humidity, etc. of the environment will also affect light propagation, resulting in a certain deviation from the range actually observed by the driver from the eye point. The vehicle blind area measurement device of the present invention avoids the above drawbacks, and through the grid with a size of 0.1m * 0.1m and numbers, the visible range can be effectively calibrated, thereby increasing the accuracy of blind area measurement.
[0039] It should be further noted that when using the present utility model for three-dimensional blind area measurement of the front view of a vehicle, it can quickly and effectively generate the three-dimensional visual blind areas of various vehicle models on the premise of minimizing the site area, and there is no need to remove the vehicle seats, which is fast, convenient, reduces the blind area measurement cost, and improves the economy. Most traditional measurement methods need to locate the measurement points on the ground, often requiring a large area. Taking a heavy truck as an example, the position of the right blind area projected onto the ground is more than 10m from the vehicle edge. Therefore, a large site area is required for blind area measurement, and the test site requirements are high. It often requires an open and flat site with a slope less than 1%. While the present utility model uses a 5m * 5m measurement curtain, which reduces the site usage area and economic cost while adapting to all common vehicle models; in addition, traditional solutions often need to remove the vehicle seats, install an eye point simulator at the seat position, and reinstall the seats after the measurement, with a relatively high measurement cost. However, the present utility model does not need to remove the seats, and uses the support component 1, the projection component 3 and the eye point simulation component 2 to simulate the line of sight range of the driver at the eye point position, having the advantages of flexibility and economy.
[0040] In one embodiment, as Figures 1 to 4 shown, the eye point simulation component 2 includes an adjustable structure 201 and an image acquisition part 202. The first end of the adjustable structure 201 is slidably connected to the support component 1, the second end of the adjustable structure 201 is rotatably connected to the image acquisition part 202, and the image acquisition part 202 is rotatably arranged along the horizontal direction.
[0041] It should be noted that the image acquisition part 202 includes a camera, a GPS module, a central processor, etc. Image acquisition is carried out through the camera, and the eye point position is determined through the built-in GPS module, so as to determine the relative position between the image acquisition part 202 and the projection area of the visible range on the curtain. Image recognition is carried out through the central processor, and the visible grid coordinate points are mapped to the ground through perspective transformation. The three-dimensional area projected onto the ground by the eye point part is the three-dimensional visual area of the front view of the measurement vehicle 5, and the invisible part blocked by the vehicle body structure is the three-dimensional blind area range.
[0042] In one embodiment, as Figure 1 and Figure 2 shown, the adjustable structure 201 includes a sliding part 2011 and a telescopic part 2012. The first end of the sliding part 2011 is slidably connected to the support component 1, the second end of the sliding part 2011 extends vertically downward, the first end of the telescopic part 2012 is connected to the second end of the sliding part 2011, the second end of the telescopic part 2012 extends horizontally and is adapted to be close to or far from the measurement vehicle 5, and the image acquisition part 202 is rotatably connected to the second end of the telescopic part 2012.
[0043] In one embodiment, as Figure 1 andFigure 2 As shown in the figure, the support assembly 1 includes a sliding table 101 and a support frame 102. The support frame 102 is arranged below the sliding table 101 and connected to the sliding table 101. The projection member 3 is detachably connected to the support frame 102. By detachably connecting the projection member 3 to the support frame 102, it is convenient to quickly replace the projection member 3, which is beneficial to further improving the measurement efficiency of the vehicle vision blind area measuring device.
[0044] It should be noted that the sliding table 101 can be fixed above the predetermined measurement position in the form of grooving, anchoring, etc., or the sliding table 101 can be supported above the predetermined measurement position by building a frame body, which is not limited here.
[0045] Specifically, in this embodiment, the projection member 3 is connected to the support frame 102 through an iron ring, and the support frame 102 is connected to the lower bottom surface of the sliding table 101 by means of anchoring.
[0046] In one embodiment, as Figure 1 and Figure 3 shown, the vehicle vision blind area measuring device further includes a sliding member 4. The sliding table 101 is provided with a sliding groove 1011. The sliding member 4 is arranged in the sliding groove 1011 and slidably connected to the sliding table 101. The first end of the sliding part 2011 is slidably connected to the sliding table 101 through the sliding member 4. By providing the sliding member 4, the quick movement of the eye point simulation assembly 2 is realized, which is convenient to adjust the position of the eye point simulation assembly 2, and further improves the measurement efficiency of the vehicle vision blind area measuring device.
[0047] Specifically, in this embodiment, as Figure 1 and Figure 3 shown, the sliding table 101 is provided with two relatively spaced sliding grooves 1011. There are two sliding members 4, and the two sliding members 4 are respectively arranged in the two sliding grooves 1011. The first end of the sliding part 2011 is arranged between the two relatively spaced sliding grooves 1011. The vehicle vision blind area measuring device is further provided with a connecting member, and the connecting member connects the two sliding members 4 and the first end of the sliding part 2011 at the same time, so that the sliding part 2011 moves along with the sliding member 4.
[0048] Specifically, the sliding member 4 can be a member that can slide in the sliding groove 1011, such as a slider, which is not limited here.
[0049] In an alternative embodiment, the sliding member 4 can be replaced by a rolling member, such as a roller or other members that can roll in the sliding groove 1011, which is not limited here.
[0050] In one embodiment, as Figure 1As shown, the sliding part 2011 further includes a plurality of sliding rods, and the plurality of sliding rods are inserted into each other so that the height of the image acquisition part 202 is adjustable. By inserting the sliding rods into each other, the height of the image acquisition part 202 is adjustable, so as to measure the blind area of vehicles 5 with different heights, improving the applicability of the vehicle blind area measurement device.
[0051] Specifically, in this embodiment, the sliding rods are inserted into each other in the vertical direction. In the vertical direction, the overall length of the sliding part 2011 is adjustable, that is, the height of the image acquisition part 202 can be adjusted.
[0052] In one embodiment, as Figure 1 shown, the telescopic part 2012 includes a plurality of plug-in rods, and the plurality of plug-in rods are inserted into each other so that the length of the telescopic part 2012 is adjustable. By setting the length of the plug-in part to be adjustable, it is possible to adapt to vehicles with different widths for measurement, improving the applicability of the vehicle blind area measurement device.
[0053] Specifically, in this embodiment, the plug-in rods are inserted into each other in the horizontal direction. In the horizontal direction, the overall length of the plug-in part is adjustable, so that the image acquisition part 202 extends into the measurement vehicle 5 and is arranged at the eye point simulation position.
[0054] In one embodiment, the vehicle blind area measurement device further includes a motor, and the motor is drivingly connected to the sliding member 4. By controlling the movement of the sliding member 4 through the motor, manpower is further saved, and the working efficiency of the vehicle blind area measurement device is improved.
[0055] It should be noted that, in this embodiment, the motor can receive the position signal sent by the remote control and control the output of its own power, so as to drive the sliding member 4 to move in the chute 1011.
[0056] In one embodiment, as Figure 1 shown, the adjustable structure 201 further includes a strengthening part 2013, and the strengthening part 2013 is connected to both the sliding part 2011 and the telescopic part 2012 at the same time. By providing the strengthening part 2013, the strength and stability of the adjustable structure 201 are further enhanced.
[0057] It should be noted that the lowermost sliding rod is the sliding rod inserted on the outermost side among the plurality of sliding rods, and the plug-in rod connected to the lowermost sliding rod is the plug-in rod inserted on the outermost side among the plurality of plug-in rods. Therefore, the strengthening part 2013 is connected to both the lowermost sliding rod and the plug-in rod connected to the lowermost sliding rod at the same time, and thus will not affect the telescopic movement of the sliding part 2011 and the telescopic part 2012.
[0058] In one embodiment, the sliding table 101 is adapted to be disposed more than 5 m above a predetermined measurement position. By disposing the sliding table 101 more than 5 m above the predetermined measurement position, the measurement of the blind area of vehicles with different heights is satisfied, and the applicability of the vehicle blind area measurement device is improved.
[0059] It should be noted that the vehicle blind area measurement device uses the image acquisition unit 202 to simulate the line of sight range of the driver, determines the recognition area of the driver by using vertical grid calibration, and quickly forms a three-dimensional blind area model of the vehicle front vision through the central processor, so as to realize the construction of the three-dimensional blind area of the vehicle front vision for different vehicle models, making the measurement process of the vehicle front vision blind area simple, convenient and fast. The utility model can not only assist in realizing the front vision check of the factory vehicles, but also check the coverage space area of the blind area monitoring and warning equipment. In addition, it can conduct numerical comparative analysis on the occlusion of the visible range by the layout of various equipment in the vehicle instrument panel, etc., which helps to reduce the vehicle front vision blind area and is of great significance for reducing blind area accidents, and has high cost performance and high reliability.
[0060] When using the vehicle blind area measurement device of this embodiment, first, the sliding table 101 is disposed above the predetermined measurement position, and the projection member 3 is fixed on the support frame 102; then, the measurement vehicle 5 is driven into the predetermined measurement position, and an indication area is drawn on the ground to ensure that the driver's cab enters the predetermined measurement position; then, the positions of the telescopic part 2012 and the sliding part 2011 are adjusted to make the image acquisition unit 202 extend into the cab through the window to simulate the rotational posture of the head of the driver during driving and the internal vision area within a range of 180° in front, and pictures of the visual field ranges at various angles are obtained; finally, through the central processor in the image acquisition unit 202, the calibration grid curtain captured in the image is recognized, so that the grid coordinates within the visible range can be automatically obtained, and through perspective transformation, the projection coordinates of the visible grid curtain coordinate points on the ground are generated.
[0061] The specific working principle of the vehicle blind area measurement device of the utility model is as Figure 5 shown. The coordinate points of the image acquisition unit 202 (X1, Y1, Z1) and the visible point coordinates of the projection member 3 (X2, Y2, Z2) are known. According to the similar triangle transformation relationship, the projection coordinates of the visible point on the ground (that is, when Z = 0, the projection of the visible point of the projection member 3 on the XOY plane) can be obtained:
[0062]
[0063] Although the embodiments of the utility model are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A vehicle blind spot measurement device, characterized in that, Comprising: A support component (1), adapted to be disposed above a predetermined measurement position and bent corresponding to the outer peripheral contour of the predetermined measurement position; An eye point simulation component (2), a first end of the eye point simulation component (2) is slidably connected to the support component (1), and a second end of the eye point simulation component (2) is adapted to extend into a measurement vehicle (5) and is rotatably disposed; A projection member (3), disposed below the support component (1) and detachably connected to the support component (1).
2. The vehicle blind spot measurement device according to claim 1, wherein The eye point simulation component (2) includes an adjustable structure (201) and an image acquisition unit (202), a first end of the adjustable structure (201) is slidably connected to the support component (1), a second end of the adjustable structure (201) is rotatably connected to the image acquisition unit (202), and the image acquisition unit (202) is rotatably disposed along the horizontal direction.
3. The vehicle vision blind area measuring device according to claim 2, wherein The adjustable structure (201) includes a sliding portion (2011) and a telescopic portion (2012), a first end of the sliding portion (2011) is slidably connected to the support component (1), a second end of the sliding portion (2011) extends vertically downward, a first end of the telescopic portion (2012) is connected to the second end of the sliding portion (2011), a second end of the telescopic portion (2012) extends horizontally and is adapted to be close to or away from the measurement vehicle (5), and the image acquisition unit (202) is rotatably connected to the second end of the telescopic portion (2012).
4. The vehicle blind spot measurement device according to claim 3, characterized in that The support component (1) includes a sliding table (101) and a support frame (102), the support frame (102) is disposed below the sliding table (101) and connected to the sliding table (101), and the projection member (3) is detachably connected to the support frame (102).
5. The vehicle blind spot measurement device according to claim 4, characterized in that, The vehicle vision blind area measurement device further includes a sliding member (4), the sliding table (101) is provided with a sliding groove (1011), the sliding member (4) is disposed in the sliding groove (1011) and slidably connected to the sliding table (101), and a first end of the sliding portion (2011) is slidably connected to the sliding table (101) through the sliding member (4).
6. The vehicle blind spot measurement device according to any one of claims 3 to 5, characterized in that, The sliding portion (2011) further includes a plurality of sliding rods, and the plurality of sliding rods are inserted into each other to enable the height of the image acquisition unit (202) to be adjustable.
7. The vehicle blind spot measurement device according to any one of claims 3 to 5, characterized in that, The telescopic portion (2012) includes a plurality of insertion rods, and the plurality of insertion rods are inserted into each other to enable the length of the telescopic portion (2012) to be adjustable.
8. The vehicle blind spot measurement device according to claim 5, characterized in that, The vehicle vision blind area measurement device further includes a motor, and the motor is drivingly connected to the sliding member (4).
9. The vehicle blind spot measurement device according to any one of claims 3 to 5, characterized in that, The adjustable structure (201) further includes a strengthening portion (2013), and the strengthening portion (2013) is simultaneously connected to the sliding portion (2011) and the telescopic portion (2012).
10. The vehicle blind spot measurement device according to claim 4, wherein, The sliding table (101) is adapted to be disposed more than 5 m above the predetermined measurement position.