中文说明：
可实现答题卡阅卷系统中的图像倾斜矫正，采用Hough进行直线检测，并根据所定位的特征直线位置计算倾斜角度，再进行图像旋转，得到校正结果
English Description：
It can realize the image tilt correction in the answer card marking system. Hough is used to detect the line, and calculate the tilt angle according to the position of the characteristic line, and then rotate the image to get the correction result