Hough is working better but not there yet

The change I made was first taking the gradient of the image before running edge.m on it (and finally the hough transform). This seemed to get rid of a lot of the extra lines towards the top of the image without sacrificing the lines on the bottom of the image.

I still have the problem that the lines that are detected seemed to not be oriented correctly - perhaps the angle is off.

Here is what I get now just looking at the vertical gradient and thresholding at 50% of the accumulator:



The next step is to get the lines detected on target (have the right angle) and also detect the vertical lines (which has proven to be significantly more difficult).