How would would one approximately reconstruct the branches in a photo of a tree, where portions of the branches are covered by leaves?
I can extract the visible portions of the branches by threshholding then opening with line segments at a few different angles. But how would I then (approximately) fill in the spaces that were covered by leaves?
Suppose we start with this drawing of a tree:
load the image as grayscale
uu = mmreadgray('tree2.jpg')
threshold the darker colors; convert to binary; remove connected regions under 200px area
vv = mmareaopen(mmbinary(mmthreshad(mmneg(uu), 200)), 20)
open vv with 10px line segments at 90 degrees, 180 degrees, 135 degrees and 45 degrees; add these images together to form a marker image zz
zz = mmaddm(mmaddm(mmaddm(mmopen(vv, mmseline(10, 90)), mmopen(vv, mmseline(10, 180))), mmopen(vv, mmseline(10, 135))), mmopen(vv, mmseline(10, 45)))
reconstruct the visible limb portions in vv from marker image zz
aa = mminfrec(zz, vv)
display result aa on top of original image uu; a reasonable extraction of limbs is achieved
I would appreciate any thoughts on how to now approximately reconstruct the entire limb. (Or improvements to the steps given above). Thank you!