Stereo Vision and Projected Light

[gbvbalint]

Hello!

I'm looking for examples for the technologies mentioned in the subject. Anyone has dealt with these? If yes, can he share an example about them?

I have found an example for Stereo Vision in Vision Development Module's help, but I'm looking for other ones, and so far no success finding any.

I would be helped out with a Light Projection example aswell.

Thank you!

[gbvbalint]

Hello!

I'm looking for examples for the technologies mentioned in the subject. Anyone has dealt with these? If yes, can he share an example about them?

I have found an example for Stereo Vision in Vision Development Module's help, but I'm looking for other ones, and so far no success finding any.

I would be helped out with a Light Projection example aswell.

Thank you!

[Klemen · Accepted solution]

Hello,

take a look at the following discussion:

http://forums.ni.com/t5/Machine-Vision/Stereo-library-2012-pointers/m-p/2171812/highlight/true#M3672...

Also, I am attaching a set of VI's (LV2012) that I used some time ago to obtain depth image from stereo image pair. They consist of three different stages:

1. Images acquisition,

2. Stereo calibration,

3. Measurements.

When there is enough (distinct) texture on the measured surface, the projector is not neccessary. But in low texture setups, it can greatly enhance the quality of the measured data. If the projector is used, take care that the pattern is as random as possible. This should give the correlation algorithm a good basis. Take a look at the following paper:

http://www.aurelien.plyer.fr/wp-content/uploads/2012/04/ptext.pdf

About "Light Projection" - if you are referring to structured lighting techniques take a look at the following page:

http://mesh.brown.edu/byo3d/index.html

Hope this helps you in some way.

Best regards,

K

[AECmartin]

Hi gbbalint,

The situation with examples is not really good because the support for Stereo vision was added to Vision Development Module in version 2012, so it is quite new.

I was able to find only https://www.ni.com/en/shop/data-acquisition-and-control/add-ons-for-data-acquisition-and-control/wha... but it is only some introduction, no real example. But Klemen did good job with examples he provided.

Please let us know if you are ok with provided links.

Martin

[gbvbalint]

Hello!

I'm still looking for some more examples.

I keep on searching, but thank you anyway!

[Klemen]

I am reattaching the code in one of my previous posts, since it was missing the "measurement" part.

Thanks to gbbalint that brought this to my attention.

Sorry for the mistake.

Best regards,

K

[lizhuo_lin]

Hello！Klemen

I try your code with two usb cameras, I use LabVIEW 2012 sp5+ VDM 2012 SP1+ VAS 2013.02，I renew some vi which are new in VDM 2012 SP1. But  the depth image is fragmented, so I upload the code and pictures. Could you help me to find the problem.

[Klemen]

Hello lizhuo_lin,

please see the following link:

https://forums.ni.com/t5/kl3m3n-s-blog/Stereo-setup-parameters-calculation-and-Labview-VDM-2012-ster...

I hope it helps you in some way.

I will try to check out your images also.

Best regards,

K

[Ivan0907]

Sorry, can I know why that code of calibration cannot work properly at my computer with 2012 Labview, whether i missed something installed.

Thank you for help.

B.R

Ivan

[Klemen]

Hello,

what seems to be the problem? Please describe it. Which code for calibration?

Best regards,

K

[Ivan0907]

Hello K,

Thank you for replying.

I tried the "stereo.zip" code from message 5th as attached, and got error -1074396120 occurred at IMAQ copy with code of "2 calibration".

I'm not sure whether I missed any thing in setting.

Thank you for help.

B.R

Ivan