Shelf Detection Code

[Perseus14]

I have implemented line segment detection using Hough Transform. As you can see from the below images, cross lines (which are not present) are detected. One idea to remove them is to take only parallel lines (might not work in cases where cross lines are more), or some angle based method.

Goal is to detect horizontal and vertical lines (preferably able to differentiate them using diff colours)

[Perseus14]

Updated code.

Find canny edge and run hough transform.
As hough only finds the line, I did a bitwise and of canny edge and hough transform output.
I did a LSD on the output and results look like these. Output is slightly better.

If intelligent merging of line segments is possible, proper edges for the shelves can be found out!!

Thoughts?