Abstract
Abstract. Recently, 3D measurements using small unmanned aerial vehicles (UAVs) have increased in Japan, because small type UAVs is easily available at low cost and the analysis software can be created the easily 3D models. However, small type UAVs have a problem: they have very short flight times and a small payload. In particular, as the payload of a small type UAV increases, its flight time decreases. Therefore, it is advantageous to use lightweight sensors in small type UAVs. A mobile camera is lightweight and has many sensors such as an accelerometer, a magnetic field, and a gyroscope. Moreover, these sensors can be used simultaneously. Therefore, the authors think that the problems of small UAVs can be solved using the mobile camera. The authors executed camera calibration using a test target for evaluating sensor values measured using a mobile camera. Consequently, the authors confirmed the same accuracy with normal camera calibration.
Highlights
Unmanned aerial vehicles (UAVs) have been noticed for periodic inspection to maintain and preserve Japanese civil engineering buildings
Experimental results using the consumer grade digital camera and sensor value measured by the Android device are shown in figure 5, in which “Normal” is the result of normal camera calibration and “Sensor Angle” is the result of camera calibration using the sensor value as the initial value measured by the Android device
This paper evaluated the camera calibration techniques using images and the orientation parameter of sensor values from mobiles device for unmanned aerial vehicles (UAVs)
Summary
Unmanned aerial vehicles (UAVs) have been noticed for periodic inspection to maintain and preserve Japanese civil engineering buildings. Inspection work in structures such as bridges and under the elevated road, was performed by humans in dangerous environments. The use of high-performance and lightweight mobile devices (e.g., Android and iOS devices) has progressively and rapidly spread in Japan (Figure 1). These mobile devices have a digital camera as well as GPS and several sensors such as an accelerometer, a gyroscope, and a digital compass. Mobile devices are lightweight at approximately 0.15 kg, and it is presumed to be capable of solving the problems of UAVs. In this study, the authors described and evaluated camera calibration techniques for UAVs using images and orientation parameters of sensor values from mobile devices
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