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Messages - Mfranquelo

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Face and Body Scanning / First Face Scan, need tips
« on: September 16, 2013, 01:15:00 PM »
Hello  :)

I'd be really gratefull if anyone could answer these questions:
Taking account that im using one camera for tests purposes, and different views :

- Does it matter if the subject moves slightly from the first photo, till the last photo ? (this is important)

- Can photoscan take advantage of a pre-set photo-order ? for aligning purposes, more or like the ptgui templates or position xml's.
- How many photo's are needed to reduce the noise till its merely noticeable ? using a canon 600d 100 iso 50mm lens
- I?ve read that you need atleast 3 cameras pointing 45 degrees - 90 degrees for accurate point depth calculation, anyone had any experience with the minimum number of cameras needed to scan a face with quite reasonable accuracy and noise ratio ?

Thanks in advance.


General / Re: Artifacts / Noise on 3d Model
« on: September 11, 2013, 12:15:14 PM »
Thank you a lot, i sent a response  :)

General / Re: Artifacts / Noise on 3d Model
« on: September 10, 2013, 04:26:48 PM »
7eicher > Yes, the next step is to try this to see the results :)
Wishgranter> Thank you, that would be great. Ill contact you!

I dont want to go offtopic but my possibilities or tests relay on what i want to achieve:

Im trying to obtain a fairly good 3d model of a face (probably until the ears + chin) for surgery purposes.
The system needs to be "cheap". So i need to find a good mix between budget, quality and time.

- I thought that maybe 6, Canon600d would be sufficient to achieve this (maybe more cameras but cheaper ones ?)  (Any ideas?)
- Before this, im trying to get familiar with pasive stereophotogrammetry. (This is why i did this short test with "36" cameras)

Again, thank you for your kind support. :)

General / Re: Artifacts / Noise on 3d Model
« on: September 10, 2013, 02:53:12 PM »
Here are the results:
- Noise is still there, however its smoothed out leading to loose of detail or innacurate forms

- I notice that noise is present in shadow zones, or cavities of the sculpture facsimil. (but theyre seen zones by the cameras) so it shouldnt be a problem of overlap shouldnt it ?

- A colleague of me processed this same object with a different set up he did, i remember seeing less noise, maybe i did something wrong ?

Thank you!

General / Re: Artifacts / Noise on 3d Model
« on: September 10, 2013, 01:42:17 PM »
Thank you for the kind support  :)

> Wishgranter - I already used Arbitrary mode on mesh generation, sorry for not pointing that out.
> Alexey - I?ll try that, thank you!

General / Artifacts / Noise on 3d Model
« on: September 10, 2013, 10:59:59 AM »

Im getting some strange noise / artifacts on my 3d model, i dont know what may be the source of this.
-> i shot this white matte object using diffuse / constant lighting
-> Canon MarkII 50mm lens
-> Fixed camera position, rotating the object on a tripod. 36 photos.
-> (I used mask from background)

Settings: Mild
Quality: High
Geometry type: Sharp
No decimation

Any ideas ?

Thank you,

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