David,
I am curious of the algorithm you use to determine the seams. The code is well
organized but not well documented.
Does Multiblend look at the masks of the input images, or just the rectangular
bounding box the image? Once it has been determined that a pixel should come
from a particular image is there preference given to the adjacent pixels to come
from the same image?
The example from Kay looks like it alternates from one image to the next, giving
horizontal lines in the lake and vertical lines in the nadir. The two nadir
images don't have the exact yrp, but even so, preference has to be given to one
image over the other.
Jim
On 2012-01-03 6:47 AM, Monkey wrote:
A little more info on the bug Kay found:
It happens when an area of the mosaic is covered by two or more
images, and the particular layout of images around that area means
that multiblend decides that an image which doesn't actually cover
that area is the correct choice. I think (looking at the PTO) the
problem with Kay's nadir is that there are two nadir images, so there
is no area which is exclusively one image or the other from which the
seam can grow.
Possible workarounds could be to remove overlapped images from
consideration if the problem is detected and recalculate the seams
(though there may still be ambiguous cases that will cause the
problem, or you'd be losing out on images that should be kept, such as
one of the two nadir images above), or arbitrarily choosing an image
to represent the area (which then re-introduces the Enblend issue I
was trying to address with multiblend, that there is not a unique
solution). Perhaps there could be some semi-intelligent grouping done,
so the nadirs are seamed first, then the middle images, then the two
groups are seamed together (though again, there may be cases with no
unique solution).
Or maybe multiblend is only suited to narrower-FOV mosaics :(
David
--
Jim Watters
http://photocreations.ca
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