Posts made by whiskeytangofoxtrot

Thanks Gulcan.

Unfortunately I can't try till I get off work later.

The sensor size info I found online is listed as "6.17mm x 4.55mm"...do these dimensions correspond to Length and Width, respectively?

B

also, the image info box, when I click on an image filename, has my camera make and model, and "6.5 mm" under focal length, and "35mm camera" under sensor size.

The info I found online had my sensor size listed as 6.17 x 4.55mm, and my focal length as "equivalent to 35mm camera: 36-108mm"

Hi Gulcan,

Thanks for the help.

This is the file path that is shown in my preferences dialog box:

C:\Documents and Settings\Administrator\Application Data\Tgi3D SU Photoscan Camera Calibration Tool\camera.db

I don't know what this tells us.

When I try to manually put in the sensor dimensions under edit -> camera info, the information does not save, apparently. When I re-open this dialog box after trying to input my sensor size it is blank.

Thanks
B

Rich,

Just watched the video...very helpful.

Still, it seemed that when the project was imported into photoshop, the axes were positioned as they should be.

Maybe mine was off because of matching inaccuracy. I had some that were way off. Ill try again.

So Im trying out the cgi3d photoscan product.

Im having problems with the camera calibration tool. Once I set up all my matched points and try to run the camera calibration, it tells me that it doesnt recognize my camera sensor size, and prompts me to put it in manually.

I do this, and click save on the camera settings dialog box - but it does not save the setting. The dialog box is blank again when I re-open it.

Also, when I calibrated the camera (apparently without saving my sensor size), and build the model in the calibration program, I get a warning that some points are "behind the camera", and this will cause inaccuracy.

When I export the project and open it in SU, there is a weird axis alingment. The manual doesnt talk about how to align the axes once you import the project from the calibration program.

Is this (axis alignment) supposed to be done via view locking?

sorry for the barrage...

Thanks so much for the help. I asked the same question at the google sketchup forums and got no response.

This Tgi3d photoscan tool looks amazing. Im going to have to try it out.

Does it correct the lens distortions you mentioned?

I am trying to model buildings from multiple matched photos.

It's obviously possible to do, but my question is: how accurate can we expect to be with this?

I have tried multiple times, and have learned a good bit about repositioning the axes, saving each matched photo as a different scene with its own origin location, only using corner photos, etc.

Every time I try, however, features end up not matching between the photos.

At this point I THINK the key is to have the different origin points related dimensionally in space as they are on the actual building. In other words, I think you need to establish the real spatial relationship of the origin points before trying to "trace" over the matched photos.

Before I buy a laser level and rangefinder, what I want to know is this:

Is it a fool's errand to try to model complex building exteriors using this tool? Are there other variables (focal length, depth of field, etc.) that make it inherently inaccurate?

I really love the feature, so I'm hoping I can get this figured out.

Thanks

B