Get Satisfaction uses Javascript and cookies.

You'll need to enable Javascript and cookies to log-in and participate.

Share Follow

Know any helpful people?
Email this to a friend
- Your Name:
- Your Email:
- Email to: Enter up to 5 email addresses separated by commas
- Add an optional message
- Optional Message:
  Character limit of 1000 characters
- Or cancel
Twitter this
Share on Facebook
Get a short URL

Share it on these other sites

3 replys made

3 persons participating

1 employee helping

The mood in here

happy 0

silly 0

indifferent 1

sad 0

Products & Services

Photosynth

Add a product

This topic is tagged

Add a tag

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

Inappropriate?

Reply to this problem

1 person has this problem

I have this problem, too! Tell me when someone solves it.
The more people who report this problem, the more it gets noticed.

The company thinks this is not a problem.

EMPLOYEE

Remove Inappropriate?
Delete or Edit

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

this solves the problem

Add a comment This solves the problem Mark as a company solution
Remove Inappropriate?
Delete or Edit

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.

this solves the problem

1 Comment Add a comment This solves the problem
Remove
bitplane commented on October 21, 2008 06:12

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