说明：  Hough变换利用图像空间和Hough参数空间的点－线对偶性，把图像空间中的检测问题转换到参数空间。通过在参数空间里进行简单的累加统计，然后在Hough参数空间寻找累加器峰值的方法检测直线。
(Hough transform image space and Hough parameter space points- line detection problem in image space to parameter space duality. Through the simple accumulation of statistics in the parameter space, then the accumulator peak detection in Hough parameter space to find a straight line.)