Search found 120 matches

by Curiousjeff
14 Jun 2017, 14:57
Forum: Photogrammetry
Topic: Can someone explain photogrammetry?
Replies: 5
Views: 14383

Re: Can someone explain photogrammetry?

I think you are correct. Indeed, uniform surfaces are not ideal. But when using RAW format, you can boost the contrast a lot, which can help the software to create a better model. I want to also try: Soft sandblasting of the model model Speckle painting the model Try polarizing filters on lamps and ...
by Curiousjeff
13 Jun 2017, 06:19
Forum: Structured light scanning
Topic: David 5.2
Replies: 5
Views: 8086

Re: David 5.2

Extended mode or stereo mode ?

If extended mode, do you still need to adjust a1 to a2 , b1 to b2, etc...

Thanks,
Jeff
by Curiousjeff
02 Jun 2017, 18:46
Forum: Structured light scanning
Topic: Grainy Scan troubleshooting
Replies: 3
Views: 5106

Re: Grainy Scan troubleshooting

1) Proceeded to fusion. This step often blends and removes some surface artifacts. Try different resolutions. 2) What happens when using the same setup on a very mat surface. Plastic can be shiny, which also induces surface artifacts. 3) Reduce brightness of projector a bit 4) Use optimal f-stop Mus...
by Curiousjeff
10 May 2017, 17:27
Forum: Photogrammetry
Topic: Testing Photoscan
Replies: 8
Views: 16323

Re: Testing Photoscan

You can view it here:

https://skfb.ly/6qB8Z
by Curiousjeff
10 May 2017, 16:45
Forum: Photogrammetry
Topic: Testing Photoscan
Replies: 8
Views: 16323

Re: Testing Photoscan

Another test with a large item. A wood mask. I think it is a good alternative to David, when the main purpose is presentation on the web or things like that. I really enjoy the time saving for the operator once the workflow is mastered. The mask against the grey background is the 3D model with textu...
by Curiousjeff
06 May 2017, 10:13
Forum: Working with scans
Topic: Online 3D Viewer
Replies: 5
Views: 13619

Re: Online 3D Viewer

Shapeways is 3D printing company. I don't think they offer something like that.

On the other hand, sketchfab does. It has a pro account that allows password protected viewing.

Jeff
by Curiousjeff
05 May 2017, 09:36
Forum: Photogrammetry
Topic: Testing Photoscan
Replies: 8
Views: 16323

Re: Testing Photoscan

It's actually scary, because the model from photoscan has no scale. I did a very rough up scale using meshlab. Highly inaccurate. Nevertheless, David was able to overlap them with "free align" (ok, the dimensions are not perfectly identical.) Yellow: Photoscan Purple: David with GH4 (full ...
by Curiousjeff
04 May 2017, 19:22
Forum: Photogrammetry
Topic: Testing Photoscan
Replies: 8
Views: 16323

Re: Testing Photoscan

@ Micr0 After a crash, I lost some of my trial scans some time ago. Here is a photo from the old forum. I will make a test with David soon. "From left to right Canon Live view Canon image grabber 21 patterns Nikon fullHD + Blackmagic Intensity Pro 4K HDMI capture card GH4 4k + Inogeni 4K HDMI c...
by Curiousjeff
04 May 2017, 09:11
Forum: Photogrammetry
Topic: Testing Photoscan
Replies: 8
Views: 16323

Testing Photoscan

I have poor memories of trying Photogrammetry before using David (HP 3D). I have now given it a try with Photoscan and my famous plastic gorilla. I modified Walter's turntable to add automatic continuous rotation and a IR emitter to trigger my Canon camera. Computing time is very long, but actual sc...
by Curiousjeff
01 May 2017, 07:50
Forum: Structured light scanning
Topic: Projecting an SLS system: Scanning precision
Replies: 53
Views: 55677

Re: Projecting an SLS system: Scanning precision

There could be some confusion about "Clean HDMI". It is usually means that the image is transferred without overlapping information like shutter speed, exposure, etc. I does not refere to the type of signal. Even though its seems obvious that a clean output should be able available, it's o...