Technical Support Questions

[thomas]

Please post all technical support questions in this forum.


Unless you have purchased a support plan from 3D3 Solutions, any emailed or phone support questions will be requested to be posted here to be answered. Thank you!

[IVAR]

I got prity good scanner acurasy percentage (i think): Horizontal: 99.935% Vertical 99.979% Depth 99.630%

Stil I got Vertical stripes on my scans. What typicaly causes this?

I scanned the headstock of a guitarneck and aligned the peases, but with the global alignment the hedstock 3D mesh became far from accurate, and useless for reversed engineering. I guess its only natural sins i have these vertical stripes.



(( I can allso use a HDMI cable insted of a VGA cant I? Im Using XP and I hav a graphics card with the HDMI output. The S/PDIF wouldnt work ))

Cheers

[fgalmeida]

hi Ivar how are you?

i also had sometimes a couple of small waves...

try to try to use Gamma setting 1.6 in ueye camera (advance setting on flexscan)

and 100% contrast in color setting graphic related to the output of Videoprojector.


i notice that it may be caused due camera position (to much angled camera, instead of paralel as possibled) or to many light exposure diference...
(some time if camera is to angled, the light rebound of object tend to be diferent in the camera point view, and it causes that one camera show some bright exposure, and the other more dark exposure, i think it cause diferent wave variations due contrast reading camera, causing wave error)

(if you are using ueye cameras, try to set the gamma to 1.6 value on the advance setting of camera on Flexscan)

and mainly caused due high bright average of the videoprojector (the white excess projection... and low contrast betwen dark and white)...

also try to put the videoprojector more distant from cameras and object... (videoprojector near object, can result in high brightness, due lamp difusing light)

in my particular case i have a videoprojector infocus X9 (conected to nvidia graphics), in the nvidia panel in color setting tab...
i use the 100% contrast...

hope this helped you...
please let me know if the recomended setting worked with you...

Best regards Fernando Almeida

[thomas]

If your scans are not aligning after your scan make sure your setup is 100% rigid, you can not zoom or change the focus on your cameras after you have calibrated them.

[DUCKMAN]

Hi Thomas

I like others on this thread am having issues with large amount of lines appearing on the scans
These can be vertical horizontal or a combination of both.
Some lines oddly appear on the scan photos and then are amplified many fold in the point cloud and mesh in both the flexiscan dash board and
Leios.

I have read the posts on these forums and have tried many of the sugestions.
The deflection of the hot exhaust gases from the
projector, ensure solid mounting of both projector and cameras
changed ambient lighting conditions from near darkness to metal halide lit bright and a few in between,
changed distances of object to the projector cameras to the projector and cameras to object.
The objects I have now sprayed in a flat white water based paint and they are shot on a chalk board black enviroment.

I have played endlessly with combinations of aperture and shutter speed and iso settings.

Am I missing something ?

Thanks

Hardware List -
Flexiscan 2.67 in Duoscan mode
Canon EOS 450d x 2 using 18 - 55mm lenses
Dell 4210x DLP Projector
i7 920 CPU ,ATI 5700 series Graphics Card, Windows xp 32 bit
Far more RAM than than XP 32 bit can use

[fgalmeida]

hi duckman.
i have post this a response in other old postings have you try my settings
with you slr...
(at moment i am not using the slr options i am using the ueye cameras, but i am a bit in standby with the 3d scanners, essentialy cause of my work, as this is more as an hobby)

My scanner is based on 2 Canons 400D eos and an infocus x9 videoprojector...
i also had several wave problems as you had...
i ususaly use duoscan mode...
and
to eleminate the wave problem i have tried almost every thing... i change exposure/f-stop settings on camera, and also bright/contrast/ gamma settings on videoprojector...
and always getting diferent waves... (diferent frequencys)...
i also notice that the waves depend on object colors..

i dont know if there will be diferent settings for you...
i sujest you to try this settings...
they work with my scanner...

in x9 videoprojector (in video projector machine setting) i use...
option briliant colors -> off
bright-> 0 (range -50, +50)
contrast -> +10 (-50, +50) ( i have notice that in infocus x9 a high contrast leeds to a better pixel projections, sometimes projectors mixed pixeis, if there are bad syncronize, and in my case the contrast setting seems to help)
gamma-> +2 (0 +3)

in Flexscan 3d...

i use on
F.stop -> 20 (sometimes i use values in range 18 - 32 depending on object color)
exposures -> 1/5 (sometimes i use values 1/4 -1/15)

also in canon cameras, i use
Manual mode (for camera to recognize Flexscan 3d F-stop/exposures settings...)
manual focus... and
custom bright control (not awb settings as canon default)

Sometimes i get small waves... but usualy theyt are caused of out-focus area (videoprojector/camera)

let me know if the settings worked with you...

best regards Fernando Almeida...

[DUCKMAN]

Thank you for your assistance Fernando,
I will give it a go as you suggested.

[DUCKMAN]

Hi Guys

Further to my above post -
I have tried Fernandos suggested setttings as a base and found a significant
improvement.
It seems to vary with the make/model of equipment used however with the Dell
Projector to reduce the occurance of the lines I needed to drop contrast by 15 in a scale 0 - 100
50 being default leaving brightness on default.
I increased the gamma in the ATI driver buy 10% of its range
I also went away from bright (max lamp luminancy 3500ANSI) to movie (mid setting)
this softened the image somewhat and this reduced noise as a bonus.
Anyhow the lines are not as pronounced now and are much finer but are sadly still visable

Any further suggestions will be most welcome guys.

Kindest regards
Duckman

[thomas]

Would you mind posting a screenshot? Unfortunately with scanning with DSLR cameras, getting clean data is much harder than with our MV cameras. Because these cameras have hundreds of settings, there could be any number of problems from having AWB turned on to ISO mode.

At some stage i would advise investing in the a pair of small machine vision cameras as that will provide both higher scanning speed, more accurate results as well, it should eliminate any line problems that you are having.

Thomas

[DUCKMAN]

Hi Thomas
Please find attached a screenshot of the issue
as per your request.

This is a moderate level example of the problem.
As you can see at the test exposure stage
but it translates to the point map and hence to mesh.

As I have indicated above in an earlier post I have tried numerous approaches to solving this problem
but apart from Fernandos suggestions which has given some directionand reduced the issue from earlier incarnations,
I have yet to crack the winning combo.

Could you give me your recomended brand/model and tech requirements for machine cameras
and I will purchase them as the downtime thus far is proving costly.