I have some images of a background, and of steam that I am subtracting to extract just the steam. Unfortunately, because the camera conditions are not perfect the differenced image is always a few pixels off generating sharp lines where features in the background don't match up pixel-by-pixel like so
I'm interested in segmenting out the steam (foreground noise), from the background. I think if I can automatically remove the continuous lines from this image it would be sufficient for my purposes.
Unfortunately it's been almost ten years since my image analysis work and I don't remember what you do to detect continuous lines. What are some simple well preforming algorithms to do this?