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Incorrect point clouds when two images are taken from the same location.

Sometimes when two or more overlapping images are taken from the same location but different angles, the point cloud gets a flat wall of points across the shared plane.

Here are a couple of examples-

1) This nearby wall shows up in the point cloud as a huge structure in the distance
http://photosynth.net/view.aspx?cid=a...
(Image: group 2, number 5)

2) Here the point cloud goes below the floor-
http://photosynth.net/view.aspx?cid=2...
(Image: column 1, row 4)

I’m not sure

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Ken, Official Rep, replied on October 17, 2008 14:27

Bitplay I couldn't find the specific flat walls in your synths. I'll confirm with our scientists but I believe the issue occurs when there are two photos where a) there isn't much movement between the camera positions and b) there isn't any 3rd photo of the same area. The rule of thumb is that all the points in your photos need to appear in 3 photos, in this case without that 3rd photo the synther doesn't have enough info to compute good depth information so it just puts the points on a plane. If you navigate the viewer to either of the original 2 images it will look correct from those perspectives but looks odd from other angles.

The synth below made from Mars rover images has a similar problem. The rovers take images with very little overlap and you can see dense points in those regions. You can see the effects of too little overlap too, the model isn't very accurate.

http://photosynth.net/view.aspx?cid=a...

It's not a bug & won't cause any problems for your synth other than an odd spot in your point cloud from some views. The solution is to include more images of the impacted region so Photosynth can accurately compute depth values.

Hope that helps,

- ken

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Nathanael Lawrence replied on October 21, 2008 03:00

Also, Bitplane, (I feel rather strange telling you this after all the highly technical things you've posted) it is quite possible to link us to the exact images you mean for us to look at by using the links provided by the envelope icon. This would save you the trouble of describing which group of photos, columns, rows, etc. things fall into.

Just a thought.

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bitplane commented on October 21, 2008 06:12

I realised this shortly after my 15 minutes editing time was up! Thanks though :-)