Stereo Vision and Projected Light

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!
Solved!
Go to 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
https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."
Attachments:
stereo.zip ‏229 KB

Similar Messages

Stereo Vision and Light Projection (or structured light)

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!

Hi gbbalint,
Please do not post duplicate posts. You can find the second post on http://forums.ni.com/t5/Machine-Vision/Stereo-Vision-and-Projected-Light/td-p/2481264 .
Martin

What is the difference when bouncing a Logic Pro X project to Stereo Mode and Normal Mode?

I was was working on a Logic Pro X Project which I am using as a Sequence for a band. When I completed my project, I mixed for left side to hear the Click track and I panned everything else to the right side. After I completed my project, I bounced to Mp3 in Normal Stereo Mode and after opening in iTunes I discovered that I am hearing the click on the right track. I again bounced and tried the Joint Stereo Mode thinking that would fix it but I still get the click track on both left and right. What is the difference between bouncing to Normal and Joint Stereo.
My goal is to produce a 2 track Mp3 Sequence so that all my click track is only heard on the left side and the produced audio is heard only on the right side.
Any suggestions?

FIrst, try to bounce to uncompressed aiff or wave and see if you get perfectL-R separation.
The compression algorithm does its voodoo and maybe some of the left right separation gets messed up with it.
About Joint Stereo.
The idea behind is to save data. The algorithm analyzes the stereo signal, when it sees signals/frequencies that are in the left and right channel, then it says, "having the same signal on the left and right channel is the same as storing only one channel (mono ), and when played back send that one channel to the left and right speaker. it saves you half the storage/transmission". However, you have to trust the voodoo again to think that if what comes out is the same as what went in.
If size and transmission speed isn't an issues, don't use Joint Stereo.
Hope that helps
Edgar Rothermich
http://DingDingMusic.com/Manuals/
'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

Stereo vision calibration failed

Hi guys,
I'm using the Calibrate stereo vision.vi (NI Vision development module 2013) to calibrate my stereo vision system but I failed and I don't know why. My experimental setup is as follows:
2 aviator 1600gc cameras, with 16mm focal lenses and a baseline of 1 cm;
a calibration grid of 16*16 dots (dx=dy=4 cm), at a distance of 2 meters;
2 light projector of 500 W.
I followed the VI instructions and made a lot of trials for 2 days, but i never succedeed in calibration. More specific, in the grid coverage control i always obtain NaN %, as showed in the picture in the attachment.
In continued to acquire images as long as all gride coverage control below are all to 100% but the VI doesn't proceed into grid vertex calibration.
Can someone help me?
Thanks in advance

Hi there,
I got exactly the same problem! I hope it's okay posting in this topic.
I followed the instructions on http://zone.ni.com/reference/en-XX/help/370281U-01/imaqvision/stereo_vision_example/ but my top grid coverage just won't show any values.
The grid is from the NI folder, so actually it should be okay.
cams: 2x DMK 23F618 from ImagingSource
lenses: 2x 8mm F1.2
Furthermore, at most attempts I won't even get any values at all.
Even if all points are detected it won't show any values. This mostly happens when I use external light sources (tried it with infrared and a common 20W halogen lamp running on DC)
I hope you can help me out here! Thanks

How do I import AVI video with stereo audio (and keep it that way)?

Today I just discovered that all the AVI video with stereo audio I've ever imported into a Premiere Pro CS6 project has been mysteriously converted to mono. And I can't find any import setting anywhere that enable me to change this.
Here's the deal...
I've have an AVI file with stereo audio (the file is actually a stereo sound test that I downloaded to prove that I wasn't imagining things). On my hard drive, I right-click and view the properties:
Video
Length: 00:00:36
Frame width: 320
Frame height: 240
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Channels: 2 (stereo)
Audio sample rate: 44 kHz
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Type: AVI Movie
File Size: 1.1 MB
Image Size: 320 x 240
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Source Audio Format: 44100 Hz - 16 bit - Stereo
Project Audio Format: 44100 Hz - 32 bit floating point - Stereo
What is going on here with AVIs? Am I doing something wrong? Are there settings I'm missing somewhere?
(And before anyone suggests I only use MOV in the future... that's not exactly the answer I'm looking for.)

Thank you for that info.
For video, the codec is MPEG-4 Video (XVID) and for audio it says MPEG Audio Layer 1/2/3 (mpga).
There are two issues with that file:
The first is the Xvid CODEC (not meant for editing), and then the MPEG Audio/MPGA. I would convert that file, to something that is more editable.
Good luck,
Hunt

Mac Mini, Front Row and projection TV?

I am wondering whether our plan to get a new MacMini with Front Row to be the heart of our entertainment system is a good idea. We want to use the Mac as our DVD player and stereo (music) source. We also want to get a fairly high resolution projector (like the ones used for presentations) instead of a TV, probably for ~ $1500.
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Where is original point of Z axis in a stereo vision system?

Hello, everyone
I use LabVIEW Stereo Vision module. After I calibrate my stereo vision system, I want to verify the accuracy of my system. I can get every point`s depth in my picture, but where is my original point of Z axis?
In the newest NI Vision Concepts Help, it is written that NI Vision renders 3D information with respect to the left rectified image such that the new optical center will be at (0, 0, Z) position. Is the original point of Z axis is on the CCD of left camera or the optical center of my left camera`s lens?
So anyone can help me ?
CLAD
CAU
Solved!
Go to Solution.
Attachments:
未命名.jpg ‏63 KB

Hello,
I would say that the coordinate system origin is at the optical centre, that is the camera's projection centre.
So, yes, the optical centre of the left camera's lense. This seems most logical to me...
Best regards,
K
https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

Stereo Vision Calibration

Hello Everyone...
Can any one plese explain the GRID Calibration procedure for a Stero Vision Application in LabVIEW along with the following queries realted to the same.
1) Would Grid Calibration will provide the 3D Position information of a Object?
2) Is it possible to prepare a test Srereo setup for Stereo Vision using USB Cameras(WEB Cams)?
3) How to confind the Field of View of the Camera to a certain Area of e.g 100x100x100 mm ?
Thanks

Hello,
perhaps the following links can help you a bit:
https://decibel.ni.com/content/blogs/kl3m3n/2014/07/24/stereovision-in-labview-based-on-correspondin...
https://decibel.ni.com/content/blogs/kl3m3n/2013/07/26/stereo-setup-parameters-calculation-and-labvi...
Best regards,
K
https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

Match EQ Learn buttons disabled and project deadline is today!

Hi Folks
I've got a MacBook Pro with FCP 5.1.1.
I'm trying to use Soundtrack Pro's Match EQ plugin to finish a project but the Learn buttons are both disabled (grayed out).
I've looked at the documentation and googled for this but can't find any info on it. Anybody have any ideas what's going wrong? I've reinstalled STP but the problem persists.
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http://PoliceBeatMovie.com
Seattle WA
206-290-8482
"In many ways editing is trying to understand the director's vision and then to surprise the director by going further than their vision."
Jill Bilcock, ACE

Hi Jill,
I was in the process of learning about the Match EQ plug-in when I saw your post. I was having the same problem until I realized that you must first play the clip within the plug-in interface before the learn buttons are available.
Hope it works for you,
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Using NI-Vision and NI-IMAQ libraries without MSVC

Hello
As part of the developpment of an application with the Qt framework, we need to use the NI Vision and NI-IMAQ libraries. It seems that they have been compiled with MSVC, and they do seem to work only when using an MSVC compiler with Qt. However, in order to ensure an easier installation and maintenance of the program, we would like to avoid having to rely on Visual Studio. We would like to be able to use these libraries with another compiler (like MinGW).
Is there a way to make these libraries work with minGW instead of MSVC ? Is it possible to ask NI to provide us with MinGW-friendly libraries ?
Kind regards,
The ASCLEPIOS Project team
le2i Research Laboratory, Dijon, France

Hi, Greg,
In the thread which you have found nothing related to NI VIsion.
In general behind of NI Vision is just few windows DLLs. They was partially optimized in Vision 8.6 for MultiCore processing (only some functions).
Refer to NI Vision 8.6 Development Module Readme.
I have compared several functions, and got following results:
So, if you needed faster processing, there are different possibilities, how to do this:
1. Use other high performance Library, for example, Intel Integrated Performance Primitives
2. Develop your own DLL for simple operations (compile it with Intel Compiler).
3. Use GPU (in this case I will suggest to try NVidia CUDA, but there are no "ready for use" solution. You should found how to prepare DLL with CUDA compiler, then call it from LabVIEW. I tried this, it works in general).
Andrey.

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Choosing between BT Vision and Youview - help?

Hi everyone, I've got a BT Vision box (black one) and am on PAYG with the old style EPG. I installed a BT Vision box this weekend and it had a lovely new EPG on it. So I have some questions:
1. can I get the new EPG on my box?
2. I'm debating moving back into contract. Do I get a new Vision box or Youview?
The reason I ask is that I saw online recently that Vision is getting the FX channel but Youview isn't. I'd quite like to watch Walking Dead on FX! I'd also like Freeview HD.
final bit of info, I like the Box Office service on Vision and the ability to rent current movies on the odd occasion without having to visit Blockbuster. Lovefilm is all well and good but the films are not current. I want the same movies as I can get in Blockbuster, albeit maybe a month or so after release (as I get with Vision at the moment)
Can anyone shed any light on the pros and cons, taking into account my desire for FX and HD?
I'm an IT Support Geek by day so feel free to get technical if you like

This should probably of on YouView board.
The new software will arrive on your box in due course along with linear channels when they launch assuming you name meet whatever criteria is laid down at the time.
Personally apart from HD channels - all four of them - I see no reason to rush to a YouView box. As I understand it and I may be wrong you won't be able to record things like the Walking Dead on the YouView box in its present configuration - bear in mind BT only issued the Humax box because PACE weren't ready with their supposedly superior box.
Finally there is no guarantee that re contracting will get you a new box but there is a fair possibility.
Whatever there is a choice and that choice has to be personal. I am staying with the BTVision box. In time the two options will merge in to one.
ps there is quite a lot of HD On Demand
Life | 1967 Plus Radio | 1000 Classical Hits | Kafka's World
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Video with stereo track and click track for live performance

Hello,
I have a video that was created in FCP sync'd with a stereo sound track and a click track. I need to play this video live (using projection) with the stereo track routed to the main outs and the click routed to the in-ear monitors for a performer to sync with. I have not done this before and am trying to wrap my brain around it. I'm also hoping to come up with the easiest and most reliable solution. As I understand it, this video will not be able to play back from a burned DVD, but rather will need to play back in Logic with 2 audio tracks (L/R) for the sound track and then 1 track for the click. These 3 tracks can then be routed to their required destinations from a soundcard or mixer.
Does this seem to be the best and most reliable method? I've only burned audio to video (never using a click) in FCP before and have always played back from a DVD. Now I have this live player/syncing component and am not sure of the best way to do it. I have some experience with Logic, but limited.
I really appreciate any suggestions/tips any one might have.
Thanks.

I've opened the movie (with stereo track) in QT Pro and then added the click - and now the 2 audio files are there, sync'd up.
When you say you opened the movie in QT Pro, I assume you mean the QT Pro version of Quicktime Player 7. So let's say you have the movie open in Quicktime Player 7, and you press ⌘J (Window > Show Movie Properties). And in the window that appears, hopefully you see several items listed, including Sound Track 1 and Sound Track 2. These are your two audio files, that are now part of the movie file. One of those files is your stereo soundtrack, and the other is your click. So let's assume that this is a total of 3 channels of sound (because I understand your click is mono).
Select Sound Track 1, and select the tab Audio Settings. Let's assume this is the stereo soundtrack. In the scrolling area at the bottom right of the window, under the heading Assignment, you should see Left and Right. Let's leave it that way.
Now select Sound Track 2. Under Assignment, there should be just one item listed (that is, there is only one channel in this Sound Track, if the click is mono). Under Assignment, it probably says Mono. Change that to Center.
Save the movie. We're done with Quicktime Player for now. Launch Audio MIDI Setup. It's here:
Macintosh HD/Applications/Utilities/Audio MIDI Setup
I assume you have an audio interface connected that supports at least 3 channels. In AMS, find the window (or tab, depending on your OS version) for Audio Devices. Select your audio interface. Select the Output tab, and press the button Configure Speakers. In the window that appears, select Multichannel, and change the menu selection from Stereo to 5.1 Surround.
You will probably see that "left front," "right front," and "center" are assigned to outputs 1, 2 and 3, respectively, of your audio interface. If not, make it so, and press the button Apply.
Now when you play your movie, the stereo soundtrack will appear at outputs 1 and 2 of your audio interface, and the click will appear at output 3. Now you can cable your stereo mains to 1/2 and your in-ear monitors to 3.

Stereo vision using commercial DSLR

Hi. I'm a Phd student in CE.
I'm going to build stereographic equipment setup using two comercial dslr cameras and labveiw.
The specific application is accurate target position estimation using stereoscopic (stereo vision system).
I know there are SDK package in Nikon and Canon for controling camera with computer. However, they don't provide multi-camera control solution so it is hard to construct it. Would it be possible to control cameras using Labview? Here, "control" means the camera control functions (such as live-viewing, zoom in/out, etc) , which are provided by commercial camera tethering software like 'Nikon Camera Control Pro 2'.
I heard that HYTEK (http://www.hytekautomation.ca/ ) made Laview VI's for Nikon cameras but I'm not sure it works for my setup or suitable for stereo vision. I hope use the software that NI provides.
Does anyone know about this topic? All suggestions/comments are welcom

dear chulminy
you can use usb camera or gige vision camera, much chiper than DSLR, and LabVIEW support those camera, you can install Vision Acquisition Software, then the camera can be config in max, and used in LabVIEW.
CLAD
CAU

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Stereo Vision and Projected Light

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