How to compute the angle of the lines of an image in matlab?

Hi guys

I need to find all the angles of the line of an image. I found a Standard Hough Transform (SHT) function in matlab,

[H, theta, rho] = hough(BW, ParameterName, ParameterValue)

Will theta be the angles of the lines? I need to represent all the angles in a histogram. I appreciate if someone could help me with this. Thanks in advance.

Marcus

Answer 1

[Walter Roberson]

No, theta and rho will correspond to the range of angles used to generate H. See the example http://www.mathworks.com/help/images/ref/hough.html and note that T (theta) and R (rho) are used as XData and YData for imshow() and so correspond to the range of values rather than individual line angles.

For line detection using hough() see http://www.mathworks.com/help/images/analyzing-images.html#f11-27827

[Marcus]

Hi

thanks for the quick reply. If that is the case, could you provide a way to measure the angle of the lines in the image? I really appreciate your help as I am still new to Matlab

Marcus