Ripple remover

[JasonGellis]

Exploring using morphological operations(i.e., erosions - cv2.erode() and dilations - cv2.dilate()) for removing ripples. So far this approach works well with images which have thinner ripple lines than scars.

2 erosions:

However, an opening - an erosion followed by a dilation (cv2.MORPH_OPEN) seems like the most promissing option.

This approach works best when the ripples are of 'thinner' line quality than the rest of the illustration. For example, this image has fairly homogenous line quality, and thus poor(ish) results:

Images with poorly connected lines do not work:

Images with lower than 300 dpi also perform very poorly (image is 200dpi).

[JasonGellis]

@crangelsmith This and issues with arrows may best be addressed by designing custom kernels derived from image proportions. I believe this data is already stored in teh algo that seperates profile, platform, and dorsal surface. We've briefly discussed this. I will open a new issu for this.