Finally, the coal-rock mass in the arch angle and apex is slided, and causes the distortion of local rock pressure, even induces dynamic hazards around working face.

拱角与拱顶煤岩滑落失稳，造成工作面局部压力畸变并诱发动力学灾害。

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Because of the illumination, geometry distortion and the Angle of camera, it results in getting multiple geometry centers in the process of template match to the images which are shot by the camera.

由于光照、几何形变、摄像头角度等原因，在对拍摄得到的图像进行模板匹配的过程中发现图形的几何中心不唯一。

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To conduct a large scale measurement, wide-angle lens is used in the camera and at the same time image distortion is introduced.

为了实现在大范围内的测量，摄像机采用了广角镜头摄像，同时也引入了比较大的图像畸变。

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