The fast formation of high-precision panoramic image for the processing of borehole camera video of deep rock mass struc
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ORIGINAL PAPER
The fast formation of high-precision panoramic image for the processing of borehole camera video of deep rock mass structures Xianjian Zou 1
&
Huan Song 2
Received: 1 August 2020 / Accepted: 29 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The structural and morphological characterization of deep-buried rock mass is of great significance to the construction of deep underground engineering, and the digital panoramic camera technology is an important means to obtain the structural morphology of rock mass in the borehole quickly and effectively. Faced with the highlighted problems of the borehole camera system and its analysis software in the complex environment, a method of fast mosaic and fusion of circular image from the borehole video is proposed. In this method, the borehole video is transformed into a number of ordered narrowband images, and the image features are detected and matched, so as to realize the rapid mosaic and fusion of borehole panoramic images. The results show that this method can quickly complete the continuous mosaic and fusion of narrowband images without the help of the compass and depth encoder, and the obtained image resolution is higher than before, and also the actual working time can be half with the process of automation and intelligent. This method can quickly and effectively form a high-precision panoramic image without deviation based on the inherent characteristics of the borehole video image. It can reduce the operational burden of researchers and improve the work efficiency, which promotes the development of borehole camera technology and provides a more convenient and effective technical means for deep rock mass engineering investigation. Keywords Digital panoramic borehole camera . Image mosaic and fusion . Feature detection . Rock mass structure . Hole-wall imaging
Introduction It is necessary to know the structural characteristics and stability information of deep-buried rock mass in geotechnical engineering, hydropower engineering, petroleum exploration, and geological disaster prevention engineering. These structures (Xu et al. 2017), such as joint, fault, soft rock, and fracture zone, are important parts for rock mass and can be obtained by a digital panoramic borehole camera system with * Xianjian Zou [email protected] 1
State Key Laboratory of Geo-mechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, People’s Republic of China
2
Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, Hubei, People’s Republic of China
high-precision panoramic video images, that is, borehole camera technology (Bae et al. 2011). The obtained panoramic video images have accurately recorded the characteristics of the rock mass structures and their morphology in the borehole (Wang et al. 2016). In engineering practice, how to quickly and effectively obtain the panoramic image of the real rock mass structur
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