利用Hough transform计算图片中两条直线间的角度，同时计算图片中所有直线汇聚于某一点的坐标-Find the angle of these tow lines shown in the image by Hough transform.As you can see in the image all of such lines are going to merge to a special point (perspective or vanishing point). Find the coordinate of this point by using intersection of the two lines you obtain in part (a). (Hint: You can use mfile hcross which follows with the problem-set materials).