OpenCV Python, filter edges to only include those connected to a specific pixel
The result of Hough Line transform is an array of (rho,theta) parameter pairs. The equation of the line represented by the pair is 
y + x/tan(theta) + rho/sin(theta) = 0
You can check whether the (x, y) coordinates of the point satisfy this condition, to find lines that pass throught the point (practically, use a small value instead of 0).
I've got a script that uses the Canny method and probabilistic Hough transform to identify line segments in an image. 
I need to be able to filter out all line segments that are NOT connected to a specific pixel. How would one tackle this problem?