OpenCV in LabVIEW

Similar Questions

• How can I get a picture back to labview from opencv dll code?

  Hi, I use the vi below to acquire an image of labview, then move to opencv dll code via, first getting pointer to image pixel and then passing the result parameters to create a "carpet" in my c code ++. Up to this point, everything works. Now I make opencv image treatment final resultiing I want to bring back to LabView. That I can't understand it. (btw, the image is a binary image). How can we get this image? Help, please

  P.S. actually what I get image3 is the same image I captured of LV

  

  Hello

  a simple example:

  OpenCV code:

  
  using namespace std;
  
  use of names cv;
  extern C
  
  extern "C" {}
  __declspec (dllexport) int CannyEdges (unsigned char * imageIN, int line, int cols, double lobbyist1, double Seuil2, kernel_size int, unsigned char * imageOUT);
  
  }
  __declspec (dllexport) int CannyEdges (unsigned char * imageIN,)
  
  				     int lines,
  
  				     int cols,
  
  				     statement1 double,
  
  				     Seuil2 double,
  
  				     int kernel_size,
  
     				     unsigned char * imageOUT)
  
  {
  
  	check the size of the odd kernel
  
  	If (kernel_size % 2 == 0) return-1;
  
  	allocate memory
  
  	Matt Image_input (rows, columns, CV_8U, & imageIN [0]); IT IS THE IMAGE, THE POINTER TO THE DATA ENTRY
  
  	Matt Image_output (rows, columns, CV_8U, & imageOUT [0]); THIS IS THE OUTPUT IMAGE, POINTER TO DATA
  
  	blur before ruse
  
  	Blur (image_input, image_output, Size (3,3));
  
  	Canny
  
  	Canny (image_output, image_output, lobbyist1, Seuil2, kernel_size);
  
  	return 0;
  
  }

  You can use directly on the "imageIN" by eliminating the image_output and replace them with the image_input.

  LabVIEW code:

  

  I enclose the Labview code (2013) and the file .dll for you to test.

  I hope this helps.

  Kind regards

  K

• using OpenCV FileStorage in LabVIEW

  I would use the LabVIEW function of the OpenCV FileStorage. Mainly because I want to transfer a c++ project to a LabVIEW project.

  But in this case, I can't load the xml file.

  I tested it in a project consolo, it seems to work.

  Here is the code:

  #include
  #include

  using namespace std;
  use of names cv;

  class MyClass {}
  public:
  FileStorage f;
  Temp of mast;
  int loadfile() {}
  f.Open("C:\\Users\\Silva\\Documents\\results\\text.xml",filestorage::Read);
  If (! f.isOpened ())
  Returns - 1;
  f ['count'] > temp;
  return 0;
  };
  };

  MyClass temp;

  extern "C" {}
  __declspec(dllexport) int loadfile();
  }

  __declspec(dllexport) int loadfile() {}
  error_code int;
  Error_code = temp.loadfile ();
  if(Error_code!=-1)
  return 0;
  Returns - 1;
  }

  
  

• Create a DLL to read an Image using OpenCV

  Hi all

  I am trying to create a DLL to perform image processing using OpenCV. In the first place, so I try to create a DLL that can read an image and display it. But I encountered a problem when I call this DLL in LabVIEW.

  The error in LabVIEW that says: "error 1097 appeared to call library function node in the .vi DLL Image playback (Play).

  Possible reasons:

  LabVIEW: An exception occurred in the external code that is called by a node call library feature. The exception may have damaged the memory of LabVIEW. Save all work to a new location and restart LabVIEW. »

  Here are the steps I followed:

  1. download OpenCV2.4.9 and extract the files. Make changes appropriate to the Environment Variables to include OpenCV.

  2 start a new 2010 Visual Studio from Microsoft Project to create a DLL.

  3. Add a property sheet in the property manager to include the OpenCV library.

  4 change the DLL of playback picture .cpp code (Play) as it is in the attachment.

  5 compile to create the DLL of playback picture .dll (Play) file.

  6 create a LabVIEW VI to call the DLL.

  Attached are the related files: 1 .cpp reading Image DLL (game) 2. Read Image .dll DLL (reading) 3. Read Image .vi DLL (game)

  If someone good to help me with this? I guess it might be the problem with the .cpp code DLL Image playback (Play).

  Thank you very much.

  1 joint code .cpp DLL Image playback (Play):

  include opencv necessary image processing libraries

  #include "stdafx.h".
  #include "opencv2/highgui/highgui.hpp".
  #include "opencv2/imgproc/imgproc.hpp".
  #include
  #include

  using namespace std;
  use of names cv;

  Function declaration
  extern "C" {}
  __declspec(dllexport) int main (int argc, char * argv);
  }

  Global variables
  Matt IMG;

  __declspec(dllexport) int main (int argc, char * argv)
  {
  Load the image
  IMG = imread (argv [1], 1);
  return 0;
  }

  Hello

  If it helps, here are some examples on Labview/OpenCV image processing:

  https://decibel.NI.com/content/blogs/kl3m3n

  Best regards

  K

• Implement the Std::Vector < < Point2i > > Std::Vector in dll wrapper for LabVIEW

  Hi, I'm writing a wrapper dll that using OpenCV function. I had been sucessfully implement Std::Vector by referring to "An array of clusters to a dll C sending".

  And now, I want to implement the Std::Vector<>> who is a lot like table 2D but each line items may be different.

  In LabVIEW, I attribute a range of cluster of the dashboard cluster of 2 I32 elements, structure which is shown below:

  

  I think it has the same functionality as Std::Vector<>> in C++.

  So I plug this data on the "Call library function node" structure and generate C code that indicated below:

  /* Call Library source file */
  
  #include "extcode.h"
  
  /* lv_prolog.h and lv_epilog.h set up the correct alignment for LabVIEW data. */
  #include "lv_prolog.h"
  
  /* Typedefs */
  
  typedef struct {
      int32_t elt1;
      int32_t elt2;
      } TD4;
  
  typedef struct {
      int32_t dimSize;
      TD4 elt[1];
      } TD3;
  typedef TD3 **TD3Hdl;
  
  typedef struct {
      TD3Hdl elt1;
      } TD2;
  
  typedef struct {
      int32_t dimSize;
      TD2 elt[1];
      } TD1;
  typedef TD1 **TD1Hdl;
  
  #include "lv_epilog.h"
  
  void funcName(TD1Hdl arg1);
  
  void funcName(TD1Hdl arg1)
  {
  
      /* Insert code here */
  
  }
  

  Then, I write this code show below in dll wrapper:

  void funcName(TD1Hdl Blobs)
  {
      vector < vector > blobs;
  
      // Distribute contents of blobs to Blobs from LabVIEW
      MgErr err = mgNoErr;
      size_t arraySizeInBytes = Offset(TD1, elt1) + sizeof(TD2)*blobs.size();     // Determine row size
      err = DSSetHSzClr(Blobs, arraySizeInBytes);
  
      if (err != mgNoErr)
          return;
  
      (*Blobs)->dimSize = blobs.size();
  
      for (size_t i = 0; i < blobs.size(); i++) {
          arraySizeInBytes = Offset(TD3, elt) + sizeof(TD4)*blobs[i].size();  // Determine col size of each row
          err = DSSetHSzClr((*Blobs)->elt[i].elt1, arraySizeInBytes);
  
          if (err != mgNoErr)
              return;
  
                  /*......................*/
          }
  }
  

  When I call LabVIEW dll, the program get interuption(i.e shutdown) on line where I want to determine the size of each row.

  Could someone give me some suggestions on this subject or promote another application of this requirement?
  Thank you very much.

  MgErr funcName(TD1Hdl Blobs)
  {
      vector < vector > blobs;
  
          Labeling(image_binary, blobs);         // the prototype of this function is: Labeling(Mat &binary, Vector> &blobs)
  
      // Distribute contents of blobs to Blobs from LabVIEW
      MgErr err = mgNoErr;
      size_t arraySizeInBytes = Offset(TD1, elt) + sizeof(TD2)*blobs.size();      // Determine row size
  
          if (contours == NULL)        {                Blobs = (TD1Hdl)DSNewHClr(arraySizeInBytes);                if (Blobs == NULL)                         err = mFullErr;        }        else                err = DSSetHSzClr(Blobs, arraySizeInBytes);
          if (err != mgNoErr)                return err;    for (size_t i = 0; err == mgNoEerr && i < blobs.size(); i++) {
          arraySizeInBytes = Offset(TD3, elt) + sizeof(TD4)*blobs[i].size();  // Determine col size of each row
  
                  if ((*Blobs)->elt[i].elt1 == NULL)                {                        (*Blobs)->elt[i].elt1 = (TD3Hdl)DSNewHClr(arraySizeInBytes);                        if ((*Blobs)->elt[i].elt1 == NULL)                                    err = mFullErr;                }                else               err = DSSetHSzClr((*Blobs)->elt[i].elt1, arraySizeInBytes);
                  if (err == mgNoErr)                {                        (*((*Blobs)->elt[i].elt1))->dimSize = blobs[i].size();
  
                          /*......................*/
  
                  }
          }
          (*Blobs)->dimSize = i;        return err;}
  

  Personaally I've usually done like this. Already, the tar of DSSetHSzClr() indicates if there was something wrong and that the handle cannot really become NULL to call this function.

  To be entirely correct and safety integrated, you must do more than that. But as long as you assume that the incoming picture is always smaller that the outgoing Board will be (usually it be 0 items when you enter this function, but if you reuse sort table in the diagram, by storing it in a registry change for example, this may not be true more) this will be enough.

• How to implement CLAHE with Labview

  Hello world

  I want to use the clahe method to improve the contrast of the image. Unfortunately, there is not any vi in this regard in vision modules of NOR.

  Research Web information site, there is a possible way to do it. In other words, build a *.dll with OpenCV clahe function file using language vc ++ and then call it in labview.

  However, it seems to be difficult for me to make the DLL.

  Did someone already made this dll file and can give me, or there are other ways to use the clahe method in Labview?

  Thank you.

  Hello

  Do you want us to build an algorithm for AHE?

  In one of my projects, I had been thorugh making such algorithm of image improvement and we created using OpenCV and VC, but unfortunately I do not have this code.

  But yes, for reference, I used google and whitepapers OR:

  http://www.NI.com/white-paper/3056/en/

  http://www.NI.com/white-paper/4877/en/

  I hope this will help.

• LabVIEW 2016 NI_ReportGenerationToolkit error

  I upgraded to Labview 2015-2016, but when you open one having previously worked for the project I now see an error in the NI_ReportGenerationToolkit.lvlib:Excel_Save_Workbook.vi.

  He tells me that the invoke node contains terminal unwired or bad.  However, it's a NOR provided VI and has not been changed between updates. Please let me know if it is a solvable issue.

  Take a look at this thread.

  Ben64

• Please convert LabVIEW 2013 urgent please

  Please convert LabVIEW 2013 urgent please

  You can go there.

• Please convert LabVIEW 13 10

  Can someone can convert LabVIEW 13 LV 10. These files come from the community

  Much thanks

  Here you are

• DAQ Assistant is not in LabView

  Hi all

  I use NEITHER cDAQ-9174 and NI 9203.  I have already installed the driver for the NI 9174 cDAQ, which is NEITHER-DAQmx 9.8.0.  I can see the device when I opened NI MAX. However, when I open LabView 2015, I can't find DAQ Assistant in the function Palette. I noticed on the chassis, 'ACTIVE' light is not on while two other "POWER" and "READY" light is on.  I look in the forums OR but I can not find the solution.

  Any suggestion, please help!

  Thank you!

  DAQmx 9.8 is not compatible with LabVIEW 2015.  You must use at least DAQmx 15.0.  See here for more details: NOR-DAQmx and LabVIEW compatibility

• LabVIEW FPGA SPI accident - SPI OR IP address for example - R series OR

  Hello

  I am trying to run the series R - sample project NI SPI FPGA Simulation.lvproj that comes with the SPI IP OR on a real FlexRIO FPGA SMU-7976R target with an attached digital adaptation NI 6581 B Module. The example is for a PCIe-7841R but I wore during my target FPGA, follow these steps and made additional changes to try to make it work with my set-up. I learned that FlexRIO FAMs CLIPs do not work with nodes in office had so I know I can't simulate the project originally planned so I will try to use FPGA to e/s node host side (open FPGA vi reference) to implement the actual hardware.

  My first question concerns my configuration of the adapter module e/s and selection. I added the IO Module (NI 6581 B: NI 6581 B channel) for my project and selected the channels as shown in the table below. I have a real physical hardware connection as described below using two NI SHC68-C68-D4 cables and a break-out Board.

  

  I changed the names as well:

  

  I selected these DIO channels because I wanted the DDCA connector to be the master and the DDCB connector to be the slave. In addition, in this CLIP every eight channels of i/o has a write enable signal. I have not used the Port configuration because I needed 4 available DIO channels and I saw DIO0-3. Is my logic of selection of channel vs correct Port here?

  Following the same strategy that examples FlexRIO/NI6581B, I changed the FPGA.vi to include initialization outside of timed loops:

  

  And in the Host.vi I have a node reference FPGA and wired loops of feedback accordingly:

  

  When I compile the FPGA and try to run Host.vi LabVIEW inevitably crashes with Crash Reporter below and must restart:

  

  Does anyone know what I'm doing wrong here? My guess is that it has something to do with the CLIP/IOModule. Any help is appreciated.

  Thank you

  Scott

  Hi Scott,.

  I suspect that the problem might be related to the fact that your node open FPGA VI reference is in the while loop and trying to open a new FPGA reference at each iteration.
  If you move outside of the while loop, it does not solve the crash?

  On channel vs port question, your logic seems reasonable to me, but I recommend to try it since this feature could depend on device.

• LabVIEW 2014 does support CDAQ 9136

  I use LV 2014 SP1, I wanted to buy CDAQ 9136 Windows controller for one of my projects. I'd like to figure out if I can use the SP1 of 2014 LV with DAQmx15.1 in the program for this controller? User manual CDAQ 9136 does not say anything on the support of LV, just said that DAQmx 15.1 is supported.

  When I tried to add a target CDAQ in SP1 LV2014 with DAQmx15.1, it does not show the CDAQ 9136. I won't use the real time of the CDAQ 9136 version, but I'm confused. Any help would be greatly appreciated.

  

  Nanda,

  I would like to clarify the compatibility for the NOR-9136. It is compatible with DAQmx, starting with DAQmx 15.1. In other words, it can be used as a normal cDAQ chassis in any version of LabVIEW with DAQmx 15.1 or later installed (within reasonable limits). However, compatibility in real-time with the cDAQ-9136 has not introduced before LabVIEW time real 2015 module, which is only compatible with LabVIEW 2015. Thus, to use the cDAQ-9136 as a real-time controller, you will need 2015-LabVIEW and the module time real LabVIEW 2015 or later. This note can be found in DAQmx 15.1 notes for supported devices.

• does anyone have a good recommendation for a voltmeter of PoE that can be integrated into Labview/TestStand?

  I started looking for a voltmeter of PoE, but so far all the ones I've found are for use of the mobile hand held.   I'm looking for a version that can be integrated in an automated production environment.

  Can someone point me to a voltmeter of PoE who has control USB or ethernet.   Ideally with Labview drivers. But if I do these myself I'll be okay with that.

  Unfortunately, I've not seen anything quite like that around. The closest I could find was the PoE3N-reach technology RT, which looks like it might have connectivity RS-232.

  Another option might be to type the tensions of the ESP and read those who use a more general tool as a DMM device or data acquisition. Something like the POET systems-FM-1. Maybe something like this work?

  There may be someone on the forum who is more familiar with POE that I am, but that's what I was able to dig up.

  William R.

  National Instruments

• Use of LabView for exploitation of Bosch Rexroth HCS01

  Hello people,

  I am a student assistant and my current project is to complete what was launched in a work of degree more than a year ago: to build an experimental platform to test the effect of superconductivity on maglev technology. Part of this experimental platform is a precision three-rail network operated by compact inverters HCS01 (IndraDrive Cs) by Bosch Rexroth.

  My question is: is it possible to use LabView to operate the three axes of a central VI?

  I have already connected all three compact inverters to a computer and I am able to operate using most Ds-startup-easy mode, but I can only operate separately and not of a single window.

  Thanks in advance, any help would be appreciated!

  Greetings,

  Paul Masuch

  Hello world

  I just found this forum article on control components Rexroth with LabView and as a representative of Rexroth, I disagree that West no way is easier to control than using Ethernet/IP.

  We have an official partnership with National Instruments, and offers a complete Package of VI for all our components (IndrDrives and IndraControl automata) to access all the features of a PLC or lead of Bosch Rexroth. This is possible thanks to our Open Core of Bosch Rexroth and our open approach we take with our automation components. For controllers the VI contains more than 850 screws to communicate directly from your LabView execution to the controller. These packages are completely free for you and you can download the packages from our Web site

  http://www.boschrexroth.com/OCE

  (access after registration in our network in engineering).

  In addition it s also possible to control our readers a cRIO OR using the Council of Europe.

  Here's a sneak peek of our open main Interface feature. There are SDKS for several languages of programming and several technologies including National Instruments Soft - and hardware.

  

  

  So you see, West don't need to learn PLC programming, when you want to connect LabView to Automation from Rexroth.

  If you have any trouble Don t hasitate to contact me!

  Best regards

  Tammo Schwindt

  Application engineer

  Bosch Rexroth AG

  [email protected]

• Allot of extra RAM for LabVIEW

  Hi all

  I'm out of memory trying to compile a great personality FPGA VI. LabVIEW generates an error and crashes when it reached the limit of 4 GB memory while generating intermediate files (specifically step 3/5). I have 8 GB of RAM installed on the laptop. I know that only 4 GB can be used by LV 32 bits, and it doesn't have a 64-bit version of LV FPGA. Does anyone have a solution or workaround for this? Decreasing again the size of my VI is not an option. I wonder if it is possible for compiling Xilnix itself of tools to access more memory?

  Mitch

  I don't think that would compile a project that includes only the FPGA VI. My project includes only the items that are needed to build the bitfile: DMA FIFO read & write, a global variable sub VI and two other sub screws, which are used in the FPGA VI. In my view, that a key issue, it's that it handles many groups that are up to 64 elements each. I took care not to include functions that take a lot of space on the FPGA, avoided constraint, etc., but the large paintings are an essential component.

  Yes, the Xilnix program itself is short of memory. If I remember correcly, the compiler showed the error message "a Xilnix request has run out of memory...". "and he said that 4 GB of RAM has been reached.

  I get to the conclusion that I have to wait for a 64-bit version of LabVIEW FPGA to be released (with a 64-bit compiler) to build the VI in the desired way.