Memory leak in imaqFindPattern

[RobKijger]

I suspect a memory leak in imaqFindPattern()

When I run this function in a loop the amount of RAM used by the program increases step by step. When I disable two statements in the loop, the amount of RAM used remains the same. The two lines that I toggle are:

pm=imaqFindPattern(input_image,ref_image,some_rect,&options,NULL,&n);

if(pm) imaqDispose(pm);

I added an 'else' to the 'if', but it is never executed.

It happens also when I use the same image every time in the loop.

I used NI Vision 8.6 and CV 8.01 on Windows XP.

Please confirm or help. 😉

[kellam]

Could you please post a copy of the input image, reference image, rectangle, and options you are using?  It will help isolate the problem much more quickly.

[RobKijger]

These are the options:

 // Init FindPattern Options
 IPFindPatternOptions.angleRanges=NULL;
 IPFindPatternOptions.minMatchScore=100;
 IPFindPatternOptions.mode=IMAQ_MATCH_SHIFT_INVARIANT;
 IPFindPatternOptions.numMatchesRequested=1;
 IPFindPatternOptions.numRanges=0;
 IPFindPatternOptions.showResult=FALSE;
 IPFindPatternOptions.showSearchArea=TRUE;
 IPFindPatternOptions.subpixelAccuracy=FALSE;

It's a little bit hard for me to attach pictures, because it is about checking passport images, so personal data is involved.

When I run the (very stripped) program below, I do not have a memory leak. 

In my original program, when I comment the imaqFindPattern(...) statement there is no leak, when I include it, there is a memory leak.

I have tried the alternative with imaqLearnPattern(...) and imaqMatchPattern(...) but that also leaks.

Maybe someone knows about a good memory leak finder (if such exists)?

This is the program that does not leak:

#include <windows.h>

#include "nivision.h"
#include "nimachinevision.h"

static FindPatternOptions o;

// main
int main(int argc,char *argv[])
{
 Image *SrcImg,*RefImg;
 PatternMatch *pm;
 int i,n;
 
 SrcImg=imaqCreateImage(IMAQ_IMAGE_U8,0);
 imaqReadFile(SrcImg,"SrcImg.png",NULL,NULL);
 
 RefImg=imaqCreateImage(IMAQ_IMAGE_U8,0);
 imaqReadFile(RefImg,"RefImg.jpg",NULL,NULL);
 
 // Init FindPattern options
 o.angleRanges=NULL;
 o.minMatchScore=100;
 o.mode=IMAQ_MATCH_SHIFT_INVARIANT;
 o.numMatchesRequested=1;
 o.numRanges=0;
 o.showResult=TRUE;
 o.showSearchArea=TRUE;
 o.subpixelAccuracy=FALSE;

 for(i=0;i<25;i++)
 {
  printf("%d\n",i);
  
  pm=imaqFindPattern(SrcImg,RefImg,IMAQ_NO_ROTATED_RECT,&o,NULL,&n);
  
  Sleep(1000);

  if(pm) imaqDispose(pm);
 }
 
 return 0;
}

[A Wooten]

Has there been any progress on this discussion?  I am also experiencing memory issues that my be related to the FindPattern function.  I believe I would find the results of this discussion very helpful.

Thanks,

Manson

Message Edited by A Wooten on 07-06-2009 09:17 AM

[RobKijger]

It is still an issue for me!

I have attached two TaskManager images of my program. In the first image my program runs with two source code lines turned OFF:

    pm=imaqFindPattern(input_image,ref_image,RectROI,&PhotoFindPatternOptions,NULL,&n);
    if(pm!=NULL) {imaqDispose(pm); pm=NULL;}

And in the second image my program runs with these two source code lines turned ON.

I know this does not make much sense running the program with these lines turned ON, but it is a way to be sure that the memory leak is in these two lines.

The result is obious: there is a memory leak in this function!

Message Edited by iai on 11-03-2009 02:55 AM

Message Edited by iai on 11-03-2009 02:56 AM

[RobKijger · Accepted solution]

Good news! After installing the NI-Vision update 8.6.1 the memory leak disappeared!

So, if you have memory issues with imaqFindPattern, locate, install and download the 27Mb NI update.

[A Wooten]

That is good news!  Unfortunately I am using an older version of the Vision Development module (v7.1.0).  Is there an update available  for my version?