On Thu 22-Sep-2011 at 09:21 -0700, kfj wrote:
I'm working on one of my mountaintop panoramas. It's made up of two sets of images: one set of stereographic fisheye shots to cover 360X180, and one set of shots with a longer rectilinear lens for a strip around the horizon. All images are taken as brackets of two or three exposures. In the project, I've assigned stacks to the images as they are bracketed; the image positions inside the stacks are unlinked, as the brackets weren's taken with a tripod.
As I understand it, Hugin only uses the stack numbers for linking positions during optimisation.
However stitching ignores these stack numbers. With 'exposure fusion' enabled it just looks at which photos overlap at least 70% (by area) to determine which to fuse as stacks before blending.
This 70% is currently hard-coded. In detail: it selects 100 points in each photo, queries all the other photos, and if 70 of these points exist in another photo then they get combined into a stack. Cropping and masks for each photo are honored when sampling.
This does mean that small photos that overlap with large photos may get fused even if you would prefer them to be blended.
Hugin currently doesn't give any indication of these calculations in the GUI, you have to stitch to find out what will happen. It would be nice to show it somehow in the Preview, or just list the stacks in the Stitcher tab, or maybe a python plugin could list them.
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