Calibration avec Labview IMAQ Vision

Bonjour,
Nous sommes étudiants en première année à Polytech' Clermont-Ferrand, université Blaise Pascal.
Nous utilisons le module de traitement d'image du logiciel Labview depuis plusieurs mois avec M.Lafon afin de repérer les coordonnées en centimètres des centres de gravité de particules.
Pour cela nous utilisons une grille de calibrage constituée de 4 points disposés en carré, espacés entre eux de 13cm. Or lorsqu'on lance le programme de calibrage (bloc « Learn Calibration Template »), l'origine du repère choisit par Labview change régulièrement. A savoir que certaines fois Labview choisit le point en haut à gauche en tant qu'origine et d'autres fois il s'agit du point en haut à droite, par contre nous avons remarqué que l'orientation des axes ne change pas.
Nous avons effectué plusieurs tests afin de comprendre le processus utilisé dans le choix de l'origine, cela sans résultats, nous ne comprenons toujours pas comment le logiciel la choisit.
Pouvez-vous nous aider à répondre à cette question, ou nous dire comment l'obliger à toujours choisir le point en haut à gauche en tant qu'origine ?
Merci d'avance.
Cordialement.

Bonjour,
Merci d'avoir posté sur le forum NI. Vous avez déjà posté votre question ici des personnes ont déjà commencées à vous répondre. Je vous invite donc par la suite à poster uniquement une fois votre problématique
Cordialement
Mathieu B
National Instruments France
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Lire l écran LCD avec Labview(NI Vision)

Salut,
je suis étudiante et en faite nouvelle dans le traitement de l image avec labview. Dans mon Projet a l' uni je dois pouvoir lire les chiffres qui s affiche sur un écran (la photo est en pièce jointe) et qui change après 5 minutes. Après recherche j ai trouve un exemple dans les Exemples propose par Labview qui pourrait peut être m aider mais la différence avec mon image c est les chiffres dans l exemples sont en segment et les miens sont composes de points. Mes Problèmes sont les suivants:
- j aimerai tout d abord remédier aux distorsion de non linéarité qui apparaissent sur l image
- ensuite adapter l exemple LCD ou Classification a mon problème de manière a pouvoir lire les chiffres de tous les nombres possible (allant de 000-999).
- enfin j aimerai aussi un tutoriel qui détail comment les exemples cités plus haut ont été construit.
Bien de choses à vous
Carine
Pièces jointes :
display.JPG ‏187 KB
LCD Example.vi ‏57 KB
Classification.llb ‏120 KB

Bonjour,
Je vous conseille d'utiliser NI Vision Assistant pour voir quelles sont les différentes étapes pour améliorer le contraste de votre image.
Voici le lien vers la documentation (elle n'est pas à jour mais les fonctionnalités sont presques les mêmes)
http://www.ni.com/pdf/manuals/372228h.pdf
Cordialement
David S.| Certified LabVIEW Associate Developer
National Instruments France
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Journées Techniques LabVIEW 2012 : du 27 septembre au 22 novembre
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What happens to a 12-bit image in LabVIEW/IMAQ Vision?

I'm using the DALSA DALSTAR 1M30 camera, and we are building a cable for it, and have not yet got it up and running, but I am already programming our application for it. I was wondering, since the IMAQ Vision VI's seem to pertain to 8-bit, 16-bit, and floating point images, I was wondering if they will work fine with a 12-bit image like the one from the 1M30 camera. I was also wondering, if they do work fine, what format the output of a VI like IMAQ ImageToArray will be. Will the 12-bit pixel values be converted into 16-bit?
Thanks for the help.

A 12 bit image is stored within IMAQ as a 16 bit image. Only routines that accept 16 bit images can be used for manipulating the image.
The IMAQ WindDraw converts 16 bit images to 8 bit images for display, using the selected method. You can also manually convert to an 8 bit image for automatic thresholding and other routines that don't accept 16 bit images. For most applications, you will want to shift it 4 bits during conversion so the most significant bits are preserved.
Bruce
Bruce Ammons
Ammons Engineering

Labview IMAQ Vision

Bonjour,
Nous sommes étudiants en première année à Polytech' Clermont-Ferrand, université Blaise Pascal.
Nous utilisons le module de traitement d'image du logiciel Labview depuis plusieurs mois avec M.Lafon afin de repérer les coordonnées en centimètres des centres de gravité de particules.
Pour cela nous utilisons une grille de calibrage constituée de 4 points disposés en carré, espacés entre eux de 13cm. Or lorsqu'on lance le programme de calibrage (bloc « Learn Calibration Template »), l'origine du repère choisit par Labview change régulièrement. A savoir que certaines fois Labview choisit le point en haut à gauche en tant qu'origine et d'autres fois il s'agit du point en haut à droite, par contre nous avons remarqué que l'orientation des axes ne change pas.
Nous avons effectué plusieurs tests afin de comprendre le processus utilisé dans le choix de l'origine, cela sans résultats, nous ne comprenons toujours pas comment le logiciel la choisit.
Pouvez-vous nous aider à répondre à cette question, ou nous dire comment l'obliger à toujours choisir le point en haut à gauche en tant qu'origine ?
Merci d'avance.

C'est vrai que c'est mieux avec le code source !
Ci-joint le programme utilisé, ainsi qu'une image dont nous nous servons pour tester notre traitement. Il faut donc charger l'image jointe lors des deux demandes.
Le bloc de calibration qui pose problème est situé étape 2.
Pièces jointes :
notrecalibrage.vi ‏103 KB
Picture 118.jpg ‏125 KB

Is it possible to use numerical camera with Imaq Vision?

For the price and because my application is static I want to use a numerical camera for take photos

If you mean by numerical camera, a commercial camera, there are several possibilities. If the camera has an analog video output (NTSC, PAL), then an NI analog image acquisition card (1407, 1411 or 1409) can be used. It may be possible to import images to LabVIEW/IMAQ Vision if the camera has a TWAIN driver. Alliance Vision sells a TWAIN driver for LabVIEW/IMAQ Vision. Note, IMAQ Vision is able to retrieve images from file for analysis, so as long as you can store the image on the PC in an acceptable file format (.bmp, .tif, .jpg, .png, .avi), then you will be able to process your images using IMAQ.
Robert Eastlund
Graftek Imaging, Inc.
Phone: (512) 416-1099 x101
Email: [email protected]

Speeding up LabVIEW scripts generated by IMAQ Vision Builder

Hi,
I am an experienced c++ software developer, I have mainly used Microsoft's Visual Studio for development. Now, I am developing a real time application using LabView and IMAQ Vision Builder. The LabView application I developed calls a script that was generated by IMAQ vision builder...the application works, but it is too slow for the processing I need to do. In C++ I wouldn't have any trouble speeding the application up, but I am still learning how labview handles threads etc. Does anyone have any ideas?

Your question is very difficult to answer. Without knowing anything about the processing you are doing, I can't suggest anything to increase the speed.
Vision Builder does not produce the most efficient code possible. It is likely that the algorithm could be improved, but this really depends on what you are doing. It is also possible that your acquisition could be what is slowing you down, especially if you are using Snap.
Perhaps if you post the code generated by Vision Builder it will be possible to help you more.
Bruce
Bruce Ammons
Ammons Engineering

Functions in IMAQ Vision for Labview same as those in Vision Builder?

Hi all...
i just have a simple question..Does IMAQ Vision for Labview has the same functions of Vision Builder?
I know that with Vision Builder you can develop an application interactively...but does it has more functions than IMAQ Vision?
So if i buy IMAQ Vision can i develop the same kind of applications that i would make with Vision Builder?
I´m specially interested in color matching and color analisys functions.
Thanks

IMAQ Vision has much more than Vision Builder. Basically, VB was created using Vision and they implemented a good number of the functions in a menu driven format. However, there are many more functions available that were not integrated into VB.
Vision does have some good color matching and analysis tools.
Bruce
Bruce Ammons
Ammons Engineering

Could I use the square grid for calibration in IMAQ vision?

In IMAQ vision 6.0, NI provide the circular grid for system calibration.But now for some reasons,we need to use the square grid for calibration.Could the square grid be used with the calibration functions in the IMAQ vision for system calibration? What special things do we need to consider when we use the square grid for calibration?

Are you talking about the layout of the points that make up the grid, or the shape of the points, or something else?
Using dots in a rectangular grid with regular X and Y spacing is the standard grid for the NI calibration routines.
I don't think the shape of the dots is critical. They could be small squares instead of circles.
If you are talking about making a grid using lines instead of dots, like a tic-tac-toe board, I think you will have problems with the NI routines. You could probably do some processing on the grid image to reduce it to dots at the intersections, but it doesn't seem like it would be worth the effort. I would just use a grid made of dots instead.
If this doesn't help, explain your problem more clearly.
Bruce
Bruce Ammons
Ammons Engineering

Certified LabVIEW Assosiate Developer worked with DIAdem in Aerospace domain using technologies FBG, SHM. Also knows vision concepts & IMAQ vision.

Hello,
I'm in aerospace domain from past 1.3 years. I have 2 years of LabVIEW experience & 1 year of DIAdem experience.
Measurement of strain, load & other flight parameters are being done in my Structural Health Monitoring Lab using Fiber Bragg Grating (FBG) sensor.
Working in IMAQ vision & Image processing fields from 3 months.
Looking for a challenging technical opening.!
Attachments:
amith_vasista.doc ‏55 KB

When IMAQ vision that is compatible with labview 8.0 is going to be released?

Hi, i got labview 8.0 but it is not compatible with imaq vision 7.x series. I am wondering when the new version of IMAQ vision that will be compatible with labview 8.0 is going to be released.
Thank you,
Christos

Hey Matt,
There is also a great knowledgebase document called How do I install my IMAQ software/drivers with LabVIEW 8?, which has an update on it that takes care of moving everything that you need to move in order to get Vision 7.x.x to work with LabVIEW 8.0. Of course nothing extra has to be done with the IMAQ Vision 8.0 software to work with LabVIEW 8.0. One more thing, similarily to LabVIEW 8.0, you can now download the Vision Development Module Version 8.0 software from NI's website in case you wanted to try out (30-day trial) the Vision 8.0 software before upgrading.
I hope this helps. Have a great day.
Regards,
DJ L.

Problems with IMAQ Vision after upgrading from Labview 6i to Labview 6.1

Hi,
We just upgraded from Labview 6i to 6.1.To do this,we uninstalled the 6i version as was suggested by NI and then installed the 6.1 version.Later when we tried to run the old vi's written using Imaq vision, we ran into different problems.Has anyone experienced any similar problems with IMaq vision after upgrading?If so please help me solve this issue.
Thanx
deepak

What kind of problems?
I would strongly suggest that you uninstall IMAQ (all elements) and reinstall them. They register with Windows, probably docked to 6i, and also must be recompiled, which I believe is done in installation.
This is your best bet.
If you still have problems, contact NI and ni.com/ask and start a support inquiry.

Concept Question - IMAQ Vision

Hi everyone,
Before I start cranking away at code and seeing if I can do this, I just kinda want to see if anyone has done anything similiar or just knows if it IS possible to do with IMAQ Vision.
So what I want to do is take the output of a ccd camera which is recording a flat target plate, but from an angle, and make it appear as if it's head-on onscreen. Ie; the camera is viewing a flat plate from a 45 degree angle below the plate so the resulting image is skew like so /_\ but i would like to make it square again |_|. It will be a video feed from a ccd, as near live as possible.
                         /-----------------\                                          |---------------------------|
                        /                        \                                        |                                  |
                       /                          \                      =               |                                  |    ????
                      /                            \                                      |                                  |
                     /                              \                                     |                                  |
                    /________________\                                    |_________________|
Like my ansi art?

Can do it but CPU intensive. Look at image calibration functions in IMAQ. You basically shot a picture of a calibrated image then let IMAQ figure out how to make it square again. We tied it, it worked nice, but cost too much CPU for our application. We used it to take the bend out of a wide angle lens. You are better off shooting it straight on if possible.
http://digital.ni.com/public.nsf/allkb/5FC615E2B4CFE8FA86256AC4007C9A42
Matthew Fitzsimons
Certified LabVIEW Architect
LabVIEW 6.1 ... 2013, LVOOP, GOOP, TestStand, DAQ, and Vison

Image processing with imaq vision with 2 webcams on the same computer

Hi,
I'm currently trying to set up 2 usb webcams (logitech quickcam for notebooks pro). I want to be able to have them both run simultaneously and do some image processing with the images that I get from both cameras with labview and imaq vision.
As of right now, I'm having trouble getting both cameras to run at the same time. Any help would be gladly appreciated. Thanks.

The USB IMAQ driver will not support running 2 USB cameras at a time (I believe it is a limitation of the DirectShow interface). You could open one camera, acuqire an image, close the reference to that camera and then do the same for the second camera.
If you need simultaneous acquisition, look at possibly moving to 1394 cameras or analog cameras.

I don't have IMAQ vision, where can I get some super basic easy VI's for IMAQ?

Hello,
I don't have IMAQ vision, where can I get some super basic easy VI's to get images from my IMAQ PCI-1424 board, without Vision?? is there some kind of tutorial that will help me get started from the ground up in designing VI's? Also I am trying to run the HL Snap in picture control.vi and I keep getting an error that says:
-1074397150 occured at IMAQ snap.vi
Possible reasons,
NI-IMAQ (Hex 0xBFF6022) wait timed out; aquisition not complete.
Why am I getting this??? it is driving me nuts, I don't know how to get a image on my computer from the IMAQ board. I can get one in MAX. Also in MAX I try to change the camera driver to Kodak because that is the boar
d that I have KLI-2113, but when I try to change anything under properties like the window size and then apply it, it says error removing old camera. why does that do that? Some of the other drivers sort of work and let me change the settings. I don't know if they work right though. I can get atleast some response to light from the CCD chip.
Anyways, thanks,
Brian

Brian;
There is an example on how to display images in LabVIEW without having the full IMAQ application.
You can always convert the images to bitmaps (flattening) and display them in a picture indicator. If you are going to do some image processing within LabVIEW, this may be the way to go.
About the error you are getting, hopefully the above example will help you in resolving the issue. If the problem persist, it will be more beneficial if you can post the code. Also, you may get better answers if you post your question in the Vision forum.
Regards;
Enrique
www.vartortech.com

Why I can't subtract two images in imaq vision builder?

Hi,
I have many times tried but failed to get the objects in a image by subtraction with another image which is background, in imaq vision builder(ver. 6.0). I totally can't use the "operators" command under "greyscale" to subtract the two images becauee all commands under the "greyscale" are always unactivated after two images have been stored in 2 idfferent buffers. I really don't know why and this vision builder is so difficult to use, unbelievable! I followed the instructions in its Help and it's quite simple but I totally failed to make this operation!
Two samples of images have been attached and maybe it's very ease for you to filter out objects(fibers) by subtraction each other. Show me your scrip
t if you can. It's urgent to me.
Or the idea of the way I thought for filtering the objects is wrong? Point out please if you know.
Thanks and Merry Christmas and Happy New year!!
Swedlin
Attachments:
10Img0.jpg ‏27 KB
123Img0.jpg ‏25 KB

Okay, this is not quite as straightforward as it could be, but you can do image subtraction in Vision Builder. The basic idea is as follows:
- select first object image and copy it to buffer 1
- select "image >> get new image" and load your background image from a file.
- put this in buffer 2
- retrieve object image from buffer 1
- perform subtraction. Even though these images appear to be greyscale, they are actually saved as 24-bit RGB images, so you need to use the color operators instead. Vision Builder will only allow you to select steps that are valid for the image you have loaded. You could extract the luminance plane from all of your images to work with 8-bit images if you like.
I have attached below a background image, several object i
mages, my script, and the results of batch processing. You will need to edit the "get new image" step with the correct path to the background image on your machine.
Bruce is right though. This is a bit easier in LabVIEW.
Regards,
Brent R.
Applications Engineer
National Instruments

Calibration avec Labview IMAQ Vision

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