Nathan.Craig's Most Recent Activity On Synths

Fortaleza Cerro Colorado

Fri, 12 Feb 2010 17:03:36 Z

"First attempt making a synth of KAP images. The aim of the synth is to generate a point cloud."

jimcseke Over 1 year ago

Hello Nathan, this is jimcseke.
I am not sure if you remember me, but a while back you and I had a discussion in the Photosynth lounge about edit images for an improved point cloud.
I have been away from the actual synthing for about 2 months now, and since you and I seemed to share an interest in accuracy, density, and editability of the point cloud, I though you might find the discussion I just started interesting and useful.
try to read it in it's entirety as most of what is written is relevant.
http://photosynth.net/discussion.aspx?cat=6b63cb81-8b57-4d5d-a978-41d5509bf59a&dis=c13fd173-a14e-4edf-8350-a3c28d6fb859

Have a great weekend,
Sincerely Jim

Acaray Sector A Point Cloud for DEM test

Sun, 31 Jan 2010 17:21:05 Z

"This synth is part of my efforts to generate a point cloud for export to DEM that is in real world coordinates. The photographs were taken with a Canon G11 and downsampled to roughtly 3.8 megapixels. Cones were used as control point targets. The real world coordinates of the cones were established by a ProXRT GPS with Omnistar (10cm accuracy). IIt took about 15 minutes to set out the cones, another 15 minutes to take the photos, and another 10 minutes to collect the GPS data on the 12 cones. While the point cloud has a suitable density, I did not get very good recognition of the control point targets (the cones). If anyone has suggestoins for better photo-targets to use in these contexts, I would be very grateful for comments or suggestions. Perhaps it would have been good to take additional photos of the targets with a zoom lens?"

pdepartida Over 1 year ago

I`m thinking that you should run the pictures into PMSV2. The GCP markers will show up there.

Acaray Sector E Structure

Wed, 13 Jan 2010 14:47:16 Z

"Attempting to model a structure in Sector E using PAP."

jimcseke Over 1 year ago

You have got to check out this synth http://photosynth.net/view.aspx?cid=061d8fe5-dfc9-493a-9a45-80aae4d44f76 and my comments in the Photosynth Lounge. In regards to improving the pointcloud.
And check out some of my synth which relate to the pointcloud improvement issue. I think (I know) I may have found a way to really improve pointclouds(images and accuracy)without taking more pics. Trust me on this one.
I call it the "Jim's Zoom Cheat" or the "Cseke Cheat Zoom" (I need to leave some kind of legacy : )

cone test

Thu, 31 Dec 2009 15:51:02 Z

"a test to see how cones work for 3d targets"

Nathan.Craig Over 1 year ago

Thank you very much for your suggestions regarding the cones. For the tests I did today, I drew on some lines and small hash marks. Scuffing the cones occurred to me. I'll give that a try. Thank you for the feedback. This is very helpful.

Acaray Quebrada

Mon, 28 Dec 2009 23:55:50 Z

"Attempt to create a point cloud that includes a 3D reference point. The reference point is a water bottle with some high contrast reflective targets. The idea was that the reflective targets should be very visible in a point cloud. If these kinds of targets can be observed in a point cloud, then it should be possible to transform the model to real world coordinates. The 3d target has been added as a highlight. Stone architecture, terraces, and rampart walls are also visible in this synth."

Nathan.Craig Over 1 year ago

Dear Madeeds,

Thank you very much for these wonderful ideas, this is just the kind of feedback I am hoping for. I will try out your suggestions post the results. I think this technology holds great promise for archaeological documentation.

Regards,
Nathan