说明：  hough 变换实现直线检测 在噪声服从高斯分布的背景中构造信噪比为2、长度为34像素的目标线段；在找出线段所在直线后，在采用固定长线段滑动的方法，确定线段的起始点，最终确定线段的确切位置。
(hough transform line detection in the noise to obey Gaussian distribution of the background-noise ratio for the structure 2, with a length of 34 pixels of the target segment at to find out where the straight line segment after the introduction of fixed long-term method of sliding paragraph to determine the segment of starting point, and ultimately determine the exact location of line segments.)