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International Conference Data Mining, Civil and Mechanical Engineering (ICDMCME’2015) Feb. 1-2, 2015 Bali (Indonesia)
A Camera installation Scheme for Wide Front View of Automobile’s Black Box Jaemyoung Lee
Abstract—We propose a wide view camera installation scheme for automobile’s black box. The proposed scheme extends the view angle of a black box to about 200 ◦ by using two camera lenses of which view angles are about 120◦. To extend the front view angle, we employ the two camera lenses at the front in the proposed scheme which enable us to get images around side mirrors of an automobile. Keywords—Black Box, View Angle, Automobile, Camera, Lens. I. INTRODUCTION
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black box is an indispensable gadget to record audio and video files for not only automobile collisions, but sudden breaking, cutting in, traffic violation, etc. Some nations have been preparing bills for mandatory installation of black boxes in automobiles [1]. Recent developments for black boxes are focused on improving image qualities obtained from cameras [2]-[4], or adapting other multimedia functions in black boxes [5]-[7]. The main purpose of the black box is recording images around cars in accidents. However, the black box cannot record the whole accident scenes around the accident due to blind spots of black box cameras of which lenses have limited view angles. Most black boxes employ one camera lens fixed to catch front images of which view angle is about 120◦. If an accident occurs beyond the range of the front camera, for example at a side of the automobile, we cannot trace down the cause of the accident using recorded black box images, Fig.1. To overcome these kinds of situations, some black boxes are sold with two cameras (2 channels) to get front side and back side views, some other black boxes are equipped with four cameras (4 channels) to record images of front, back, left and right sides, Fig. 2. However, employing more cameras means more labor to install the cameras, more power consumption, and higher cost. Since the view angle of the black box is determined by the view angle of the camera lens which is currently about 120◦, to extend the front view angle, we need to develop a wide view angle camera lens that requires advanced lens design and manufacturing technologies. Rather than following this method, we propose a new camera lens installation scheme in which two camera lenses at the front side to extend the front view angle to more than 200◦. This scheme enables us to obtain even the images around side view mirrors. UTOMOBILE
Fig. 1 Automobile collision which occurs outside the view angle of a black box
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Fig. 2 Camera installation schemes (a) 1 channel (b) 2 channels (c) 4 channels
We believe that the proposed camera installation scheme is advantageous over conventional black boxes in terms of view angle, power consumption, cost, size, etc. II. THE PROPOSED CAMERA SCHEME IN A BLACK BOX The front view angle of commercially available camera lens in a black box is about 120◦, which is not wide enough to get side images around the side mirrors. Recording of left and right side images is necessary, because, in accidents at intersections, many cars are collided with other cars from sides, of which images can not be caught by conventional black boxes. In this paper, we propose a new camera lens installation
Jaemyoung Lee is with the Korea Polytechnic University, 2121 Jungwang Shihung Kyunggi Korea(ROK) (corresponding author’s phone: 82-31-8041-0483; e-mail:
[email protected]). http://dx.doi.org/10.15242/IIE.E0215019
(b)
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International Conference Data Mining, Civil and Mechanical Engineering (ICDMCME’2015) Feb. 1-2, 2015 Bali (Indonesia)
scheme in a black box to extend the view angle of the black box up to around side view mirrors, more than 200 ◦, Fig. 3. Two front camera lenses are installed at oblique angles in the proposed camera scheme, which can catch the side images at around 180◦.
Fig. 3 The proposed black box scheme with two camera lenses
By fine arrangement, the proposed scheme can theoretically extend the view angle up to 240◦, including images around the side view mirrors of both sides, Fig.4. Considering the overlapped region of the two front camera lenses in the proposed camera lens scheme, the actual view angle of our implemented black box is approximately 200◦. Fig. 5 compares the view range of the proposed scheme with the range of the conventional black box. While the view angle of the conventional black box is about 120◦, the view angle of the proposed scheme is larger than 200◦.
Fig. 5 The proposed black box view compared with the view of a conventional black box
Fig. 6 shows the proposed black box which has two front camera lenses to get wide view angle. In the proposed scheme, two camera lenses are located at each side of the front part with oblique angles. The distance between the two lenses and the oblique installation angles of each lens from the front determine the overall view angle of the proposed scheme. Larger distance between the two lenses and larger oblique lens angles means larger missing region just around the front part from the bonnet of a car. On the other, less missing region from the bonnet of a car and larger overlapped area of two images from the two camera lenses are expected by making smaller distance between the two lenses and smaller oblique angles.
Fig. 6 The proposed black box with two front camera lenses
To record the whole situation of an accident, the proposed black box can also be equipped with other sensors such as acceleration, speed, and tilt sensors, sound recording system, global positioning system (GPS), etc.
Fig. 4 The proposed black box view angle with two camera lenses
Fig. 5 shows a vague line around the center of the image which is made by locating left and right images from each camera side by side on the same display. Adequate image processing can remove the center line. Though our scheme realizes the view angle of 200◦, we can further extend the front view angle by adjusting the locations and angles of two camera lenses.
http://dx.doi.org/10.15242/IIE.E0215019
III. CONCLUSION We propose a new black box camera lens scheme to extend the black box view angle larger than 200◦. In the proposed scheme, we employ two camera lenses to get wide front view, by locating the two camera lenses at the front distanced from each other with oblique angles. Further extension of the view angle could be made by adjusting the distance between the two lenses and the angles of lenses installed at the front. The proposed scheme can theoretically extend the view angle up to 240◦, which is wide enough to get two side images with two cameras. Instead of using three cameras in conventional black boxes, the
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International Conference Data Mining, Civil and Mechanical Engineering (ICDMCME’2015) Feb. 1-2, 2015 Bali (Indonesia)
proposed black box camera installation scheme reduces the number of camera lenses to catch side images with less power consumption, cost, size of the black box. Further research is required to get wider view angle through device development and image processing. REFERENCES [1] [2]
[3]
[4]
[5]
[6]
[7]
IACP Research Center, The Impact on Video Evidence on Modern Policing , International Association of Chiefs of Police, 2004. A. Kassem, R. Jabr, G, Salamouni, and Z. K. Maalouf, “ Vehicle Black Box System,” SysCon-IEEE International Systems Conference, 2008, pp. 1-6. S. Saha, S. Basu, M. Nasipuri, and D. K. Basu, “License Plate Localization from Vehicle Images: An Edge Based Multi-stage Approach,” International Journal of Recent Trends in Engineering, vol. 1, 2009, pp. 284-288. P. Karasev, P. Vela, and A. Tannenbaum, “IMU-Compensated Image Segmentation for Improved Vision-Based Control Performance, “ SysCon-IEEE International Systems Conference, 2013, pp. 251-257. D. Pawar, and P. Poddar, “Car Black Box with Speed Con- trol in Desired Areas for Collision Avoidance,” Engineering, Technology and Applied Science Research, vol. 2, 2012, pp. 281-284. S. Alfatihi, S. Chihab, and Y. Salih Alj, “Intelligent Parking System for Car Parking Guidance and Damage Notification,” International Conference on Intelligent Systems, Modelling and Simulation, 2013, pp. 24-29. C. Patil, Y. Marathe, K. Amoghimath, and S.S. David, “Low Cost Black Box for Cars,” India Educators’ Conference, 2013, pp. 49-55.
http://dx.doi.org/10.15242/IIE.E0215019
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