professor_rumsdiegeige

Hello everybody, has someone managed to install Labview 8.x on an ASUS Eee PC? If so, I need some help, because it looks like the default installation script doesn't work with the Xandros OS. Any experience reports welcome.

Hi! Can anybody help me in how far it would work to write an own USB driver for the real-time Labview environment to connect to a special USB camera? Does Labview RT have a USB stack, and would it be difficult to port an existing Windows driver to this environment? Unfortunately I do not have experience in this field, so excuse me if the questions are quite unprecise... Thanks in advance! cu sabine

Hi out there! I've got a very newbie-question. When I want to use variables in Labview, do I really always have to create a front panel object for that? An example: I retrieve a two-dimensional array out of the Capture-Image-From-Camera Function. Next, I want to process this image etc. This means I need to store the array somewhere, and currently I do so by creating a front panel object and read / write the values from / to there. Is this the right way? But then I always need to hide this object from the user, because in this form, the array is of no interest to the user… confused… Can anybody help me?

QUOTE (Neville D @ Apr 4 2008, 06:41 PM) Thanks, now I got it. I mixed it up with a simultaneous call to an external DLL and it got mangled up… QUOTE (Neville D @ Apr 4 2008, 06:41 PM) Like I said, make a mask apply it and then your in business. It is always very slow (with IMAQ) to extract pixel or pt data and act on that. Use masks or ROI's to mark out a region and then process the region. As to this point, I am still confused. I agree with your mask idea, but still I would need to know which pixels have to be masked. I only know the boundary pixels, and I could mask them. But how do I know which pixels lie inside this boundary? Thank you very much again for your help. I appreciate that!

QUOTE (Neville D @ Apr 4 2008, 06:04 PM) Hi, thank you for your answer. I tried IMAQ Symmetry, but evidently I got it wrong. When I use as parameter "Horizontal", it keeps on mirroring the image both in the horizontal AND in the vertical sense, which is quite weird. With "compute" I mean that I need a list of the indices or the X/Y-coordinates of the pixels inside the boundary, for instance to display all pixels inside in red color in a segmentation map.

Hello! Maybe this is an awkward question, but it seems to me as if Labview IMAQ doesn't have a function to mirror an image. Am I right? I've got another question, though, and that is: assuming that one has a set of pixels that describe the boundary of an object in an image (i.e. one has the border pixels, e.g. obtained by a Sobel filter with subsequent thresholding), is it possible to compute the set of pixels "inside" this boundary? Thanks a lot for your help. best regards

Thanks, decimate array was exactly what I was looking for… regards QUOTE (Louis Manfredi @ Mar 20 2008, 02:46 PM)

Hi! Is there a built-in function in Labview to extract every n-th element out of a one-dimensional array? If not, how would you create a fast (!) replacement? Thanx in advance.

Hi! I've got a problem to install Labview. Everytime I need to install Labview on a computer on which Visual Studio 2005 is already installed, the Labview Installer comes up "Installing Part 1 of 8" and hangs there for ever. Has anybody faced similar problems?

Hi! After a .NET constructor node, I use the the Invoke Node to call the following function public void TestFunction_LoadImageFile(ref string filepath) { Debug.WriteLine("TestFunction is called - make sure to use it only in debug mode !"); SrcImage = new System.Drawing.Bitmap(filepath); } where SrcImage is of Type System.Drawing.Bitmap. As soon as this invoke node is reached, Labview crashes. If I debug it, I get a stack overflow is mscore lib... Anyone got an idea why? Thank you very much in advance for your help.

Hi! Suppose one creates a .NET DLL to use it from within Labview. Then I can use the external library call functions of Labview. But if I detect an error in the DLL, and decide to replace it, I recompile the DLL but I always have to close down Labview completely before I can exchange the file, otherwise it is in use. Is there no other way than shutting down Labview completely to exchange an external DLL? Why does it keep references to the DLL open all the time? Thank you!

Thank you. And how can I query those ROIs from the code behind? Currently, I use a refernce to the image display control, use the property "ROI", but with that I only get the first one, right?

Hello forum! I'm using Labview 8.2.1 and the Vision toolbox. I create an image display control on the frontpanel, und I would like to define more than one ROI using this image display control. Is this possible, and if so, how? Thank you in advance.