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line.rho()返回霍夫变换后的直线p值。我看到在小车巡线上用到了这个值，用来判断返回直线（中线）的偏离中央的程度。但是这个值得具体物理意义是什么？能不能画图解释一下？
直线比如y=ax+b，一个是斜率，一个偏移。
line.theta()和line.rho()对应的。
但是我忘了原点什么。
