I am just starting out using Image modeler and am having some difficulties during the calibration step.

My project is sort of long and it was difficult to get far enough away to get a clear picture of the entire structure. I have images over corners as recommended. I took some photos looking down the sides of the structure to try to get some depth info. The result is that I will need to calibrate something like 10 views to capture the entire structure. I can easily calibrate the first few views but then it is as if the recalibration breaks down after the first 3 or so views. It is difficult to get many images with overlapping points (same feature appearing more than two images)unless I increase the number of images I use significantly.

I get good calibration and a lot of green points. Then I add some points and try to get the software to include the next view in the solution but then many points suddenly turn red and yellow and already solved views loose their solution.

Am I going about this the wrong way or is there something I am missing?

Regards,
Peder

Not sure if I should be happy or sad that you are having the same issues? Perhaps this points to the fact that it is not so easy after all? If this is the case I will be very disappointed. Hopefully someone with more expertise will have a solution or technique for this…

After all the demo video shows a building with something like 14 views all around it here:
http://download.autodesk.com/us/imagemodeler/video/imagemodeler02.mov

Perhaps the key to success is to have more than two images that share enough markers?

Is it perhaps better to use panoramic images in these kinds of situations? I suppose this would allow me to see more of the building from a single “view”
Best regards,
/Peder

Hi there.
So far I’ve done some advanced tests. I’ve created some reference points and printed them out. I choosed a testscene with a small model with a blue background. So the onliest information about 3d space the software would get from my reference points that I would place. As they have 90 degree corners and a known distance in it sould work.
And it did. I calibrated 8 images nearly perfect. So they key point seems that you must really exactly know where your locator points are.
If you guess or can’t determine the exact point because of the reference images exactly it is enough to be 2 pixels away to blow up your mesurement.
Also if you have a round corner with is a 90 degree corner but not hard. So placing there some pixels away could cause a problem. Choosing and locating locator points correct is the key.
Also be 100% sure when you create cornor constrains that the angle is exactly 90 degrees. If you are some degrees away - same as above it will be incorrect.

Hope this helps.

Regards

Regards Matthias

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