I've been trying to implement this paper from Boris Epshtein, Eyal Ofek, and Yonatan Wexler, the pioneers of Stroke Width Transform .
Having a simple image with random texts, that underwent gray scaling. Then I have produced two edge maps using two different algorithms for output comparison (for later) , Sobel and Canny (I'm also planning on Prewwit or other edge detection algorithms). I also have gradient maps x and y, using sobel.
on the segment of computing the gradient direction, given the equation:
- theta = is the resulting angle
- Gx = is the X gradient component
- Gy = is the Y gradient component
(both Gx and Gy are from the gradient maps)
I got a bit confused. If the value of Gx is 0 (zero), and we all know dividing by zero is undefined (some say it's infinity), so are we going to make theta infinity or just 0 (zero)?