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Why do some image pairs have incorrec...

The Panorama Factory Forum » The Panorama Factory FAQ » Why do some image pairs have incorrect (very small) overlap? « Previous Next »

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Posted on Tuesday, October 26, 1999 - 10:56 am:   Edit PostDelete Post

I have attempted five different panoramas using Pan Factory. Two of them resulted in good quality panoramas. However, in the three other cases, Pan Factory stitches (one or more pair of images in each of the three) with only a few degrees of overlap, when there is 50% overlap in the images.
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John Strait
Posted on Tuesday, October 26, 1999 - 11:11 am:   Edit PostDelete Post

What's happening is that the automatic alignment routine is failing to find a good alignment. I don't know why, but it has trouble with some image pairs that seem obvious to us.

See Step 4 -- Fine tune the stitched image under Making a panorama, step by step in the help for instructions on correcting the overall alignment. You need to start by opening the overlap region. You click on its top or bottom edge (see the Stitch command in the Help).

Small problem is that your overlap region may be very narrow, making it hard to click on the top or bottom edge. You can give the overlap region a little width by stretching one side or the other. This will make it easier to click on the top or bottom.

The automatic aligner is not perfect. Rather than trying to get it to work perfectly on all images (an impossible task I think), I settled for making it work well on most images.

I think that people and computers should each do what they are good at. People are very good at the kind of pattern matching required for the alignment problem-- much better (and faster) than computer software (mine at least). Computers are good at the tedium. So the software should do all the easy image pairs while you do something else (read the paper, drink coffee, etc.) and you can step in to correct its mistakes. It is a very hard problem to write software that can do as good a job as you can at this particular task.

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