quantity vs quality of photos

[thomas83]

which approach will get me the most detailed object?

a) more pictures with less resolution
or
b) less pictures with more resolution?

i know it heavily depends on the objects characteristics how much pictures are needed, i?m just trying to understand how your software works   generally my experience with agisoft indicates "the more the better" for both quantity and quality....but i'm trying to come up with a workflow that balances processing time, file size and object resolution.

thanks for your help 
tom

[Wishgranter]

Thomas if everything go smooth, then we will test 10 Mpix, 18 Mpix and 21 Mpix cameras next week on the same objects - same FOV - different lenses. and compare in profesional CAD solution what are diference there. And yes, we will shoot 36 pic - every 10 degrees, and do test tun with 36, 24, 16 and 8 photos and compare results..... but from principle fewer hires photos give better precision output.. 

[thomas83]

that sounds great! what size objects are you covering in your test? will you publish your results in the forum?

from your posts i understand that you come from a heritage/archeological background, is that right?
i study archeology and i'm currently writing a paper on the merits of photoscan for archeological documentation, so i?m eagerly awaiting your results

i also plan to post some of my progress in the forum, but until now i have been busy developing a workflow and automatizing some aspects of it

good luck and thanks for the reply

[Wishgranter]

Yes our main interest is in building models in 1:25 scale www.mhb.sk But now is undergoing project on Digitalisation of Cultural heritage - we want be one of 8groups in our country that will make it happen. Plans is to capture in 3 years around 50.000 units, if everything go smootlhly then probably over 150.000 and afther that we will concentrate on the buildings. Now is planed tto do the smaler things, like coins, vases, smaller statues etc. - we plane for next thuesday to test few things, to "scan" a few objects with white light scanner, lasers scanner and photogrametry. we will test 3 different camesras = Canon 40D, 550D and 5D mark II. and compare outputs to reference data that come from Laser scanner http://www.zcorp.com/en/Products/3D-Scanners/ZScannerandtrade_800/spage.aspx

Outputs of this will be used as "guidelines" for that project...

sw will be used what seems to be the mostly used - Pscan, Photomodeler scanner, 123D catch and
this one http://shapecapture.com/Products.htm if they send us some sw version on that we can test


is that something that you want to see ? :-) 

[FoodMan]

Interesting link Wishgranter... I did not know ShapeCapture.. it looks like they use structured light..? How does it compare against the Mephisto Scanner which apparently uses the SL also....

http://www.4ddynamics.com/3d-scanners/mephisto-ex/

I saw a demo of it and was super impressed by the speed and quality.. but the price was very high too..

h/

[Wishgranter]

They Use structured but it can work with classical Photogrametry, im asking for a "demo" that it can be tested. will inform all what i get.

About this suite i get info just from searching - but see no whitepaper or something about it.

And Yes if we compare price for SL devices the price is too high - around 30.000+ EUR and UP. but if it can capture in seconds and the quality is good then it can be acceptable. But this solution cost just around 12-15k with cameras and sw.  My primary interest is in Quality/Speed/Price and most importantly  the EASY work with that solution. because not everyone can play with lot of settings.



 

[FoodMan]

hey thanks for the answer.

So that system cost about half as 4DDynamics... Interesting.. Please Let us know when you get the demo..

f/

[Infinite]

To answer your question I would say:

a) more pictures with less resolution

b) less pictures with more resolution?

*c) more pictures with more resolution*

But if that isn't possible:

a) more pictures with less resolution

..but nothing lower than 10-12MP really.

the more you have of everything the better the data will be but of course this has an impact on processing time.

[Steve003]

Hi,

So what was the result of the tests ?

Cheers

Steve