Messages

1

General / Re: programs to edit 3d model

« on: February 04, 2014, 02:44:30 PM »

Blender is quite powerful, considering it is free.  However, the learning curve is steep.  For simple edits, you might also try Meshlab (also open source).

Harold

2

Face and Body Scanning / low-cost scanning using Kinect

« on: January 11, 2014, 03:34:15 PM »

For those who have interested in scanning of human subjects, here is an admittedly low-resolution but pretty cheap option (used Kinects are available on amazon for about $35).

The app uses some pretty sophisticated non-rigid registration algorithms.

The entire scan takes at least 30 seconds or so, I would guess.

The application doesn't allow saving the file generated by the Kinect.  But as sensors get cheaper and resolution improves, I wonder if this scheme has applications for something more than novelty "selfies."

https://shapify.me/

Disclaimer:  I don't have any financial interest in shapify.com and I don't even think I'll make use of it; just wanted Agisoft and members to know what the competition is up to...

Harold

3

General / Re: Monochromatic surfaces????

« on: November 04, 2013, 12:04:08 AM »

Have you thought considered projecting a noise pattern?
Here is a link to one thread that discusses some aspects:

http://www.agisoft.ru/forum/index.php?topic=1324.msg6851#msg6851

Best of luck!

Harold

4

General / Re: Problems with Capturing data

« on: September 24, 2013, 12:41:00 PM »

Gawin,

I can't really find the shadow that you speak about, but it may be my old age!  Do you mean the wall seems to be darker?  If that's the case, are you allowing enough time shots for the flash(s) to sufficiently recharge between shots?

Hopefully somebody else has a better solution,

Harold

5

General / Re: OBJ Splitting App?

« on: September 09, 2013, 05:02:42 PM »

Mark

I'm not sure about the automatic part, but I've used blender (open-source, free download at http://www.blender.org/download)  for similar projects.

I think the biggest technical challenge has to do with where, or if, your dividing plane(s) intersect the vertices of your original object. 

Here's a link that might be useful:

http://wiki.blender.org/index.php/Doc:2.6/Manual/Modeling/Meshes/Editing/Subdividing/Knife_Subdivide

Best of luck

Harold

6

Face and Body Scanning / Re: Samsung NX1000

« on: June 10, 2013, 04:56:12 PM »

Roberto,

I am very impressed with your results, even using two cameras.  Thank you for posting the results.

You've inspired me to work harder to finish my rig (8 canon sx130s, and sync by flash); I hop I can upload some files soon.

Keep up the good work.

Harold

7

General / Re: more detail and less noise

« on: April 24, 2013, 04:06:05 PM »

RalfH,

Thanks for a very helpful list of how to get better scanning results.
Just a clarification for item (b):  the angle between the camera and the subject should be as close to normal (90 degrees) as possible?

Harold

8

Face and Body Scanning / Re: Samsung NX1000

« on: March 31, 2013, 05:40:22 PM »

Very elegant solution!  I'd love to see some of your scans, especially how you deal with subject movement.

Congratulations!!

Harold

9

General / Re: which camera for low-altitude aerial photography (for use with PhotoScan)?

« on: March 26, 2013, 11:02:54 PM »

Here is an interesting link on a discussion on how to reduce the cycle time for CHDK enabled Canon Powershots to about 1 second per exposure. The key is to disenable auto-focus, focus, and exposure, and to have a fairly short and clean script.

http://chdk.setepontos.com/index.php?topic=9188.0

I've got a SX130 down to about 1.3 seconds.
Hope this help.

Harold

10

General / Re: OBJ pointcloud

« on: March 15, 2013, 09:02:30 PM »

Sorry, I hadn't allowed public access to the file.  Try this link:
http://rapidshare.com/files/3083928251/meshlab%20pointcloud00.png

11

General / Re: OBJ pointcloud

« on: March 12, 2013, 06:33:32 PM »

MeshLab is a free, opensource, software that opens your point cloud.
http://meshlab.sourceforge.net/

Here's a link to a screen shot, with a bit of magnification of one of the sections.
http://rapidshare.com/files/3083928251/meshlab%20pointcloud00.png
Harold

12

General / Re: How to capture the top and bottom side of a boat?

« on: February 28, 2013, 08:36:43 PM »

Yes, there is a lot to consider before putting out the money. 
By the way, I'm thinking of using the trial (free version) of the software that has a version of of Hao Li's non-rigid registration algorithm.  Lee mentioned it a few weeks ago: http://www.artec3d.com/shop/
As soon as I get some scans that look promising, I'll post the results.
Best of luck to all those engaged in this work! 

13

General / Re: How to capture the top and bottom side of a boat?

« on: February 26, 2013, 05:24:59 PM »

VTK (www.vtk.org) and ITK (www.itk.org) are free, and can convert mesh files, like OBJ, to various solid volume formats.  They are amost exclusively used in medical imaging, however, and they seem to require a fair amount of programming experience (C++, CMake, etc.) to get them to work.

The advantage is that they also have non-rigid registration tools, which I haven't yet been able to figure out (see my caveat about programming experience.)

At least they're free...

Harold 

14

Face and Body Scanning / Re: Samsung NX1000

« on: February 06, 2013, 05:31:56 AM »

That is a great plan.  I wouldn't be able to produce anything for a couple of weeks, at the earliest.
In the meantime, I'll try to figure out how to use 3d slicer as a possible back-up.

Harold

15

Face and Body Scanning / Re: Samsung NX1000

« on: February 04, 2013, 10:38:32 PM »

Very interesting discussion, Andy.

I had only briefly considered more than one pole with cameras attached, but the scenario with multiple poles, with each pole only having to travel a fraction of the 360degree path, has a lot more pros than cons, it seems.  I might have to buy a few more cameras!

I think that only with experimentation can we determine if a living subject can hold still long enough (2-4 seconds?) that a non-rigid registration can be avoided.
Can't wait to try!

Harold