grow line from a point on both sides along angles with x axis
I have a portrait picture as input. After pre-processing, I only keep the region of hair as what I need. After convolved with Gabor filter banks, I get estimated orientation at every pixels.
Here's my problem. I have a set of seed pixels, and I want grow 2D hair strand segments from seed pixel along its orientation on both sides.
If the seed point is
p(x,y) ,
forward tracing is
p1 = (x+step*sin(theta), y-step*cos(theta)) ,
backward tracing is
p0 = (x-step*sin(theta), y0+step*cos(theta)) ,
the step is 75% unit pixel width. In order to get smooth line segment, the orientation of new position is bilinear interpolated by its nearest 4 neighbors. But unfortunately, I didn't get good results. Can anybody help me to check out what's happening? Thanks a lot.
Input image:
Traced line segments:
I just want to implement the 2D hair generation method of this paper: Single-View Hair Modeling for Portrait Manipulation
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