Hough transform and openCV

Question

I am having doubt in understanding hough transform. Does in hough transform the angel theta means the lines in which lines needs to be detected like if I want to detect lines in 30 or 50 or 60 or 70 or 80, then should I just change the value of theta?

Answer 1

Have a look at this tutorial. The angle theta is drawn in the first figure. It actually is a parameter of the expression of the line in the polar coordinate system.