Problem with Image::Compare module.

[balajinagaraju]

Hi, I am using the Image::Compare module to compare two images and here is my code

sub CompareImage{
        
    print " CompareImage function called";
    my @args = @{$_[0]};
    print "Arguments:".@args[0];
    print "Arguments:".@args[1];
     my($cmp) = Image::Compare->new();
     $cmp->set_image1(
         img  => '@args[0]',
      );
     $cmp->set_image2(
         img  => '@args[1]',
     );
     $cmp->set_method(
         method => &Image::Compare::THRESHOLD,
         args   => 25,
     );
     if ($cmp->compare()) {
          print 'The images are the same, within the threshold';
          return 'PASS';
     }
     else {
        print 'The images differ beyond the threshold';
        return 'FAIL';
     }
    
}

I am triggering this function from a different file and i am passing an array reference which holds the images to be compared(absolute path to the image files). I am accessing the images using the indexes and itseems to be failing during the comparison, when i print the content of the array i am getting the correct values but if i use it a comparison it fails, however if i hardcode the path values the function works fine. I am getting the below error with the above usage.

CompareImage function called Arguments:D:\\img1.jpg Arguments:D:\\img2.jpg Unable to read image data from file '$args[0]': 'Could not open $args[0]: No such file or directory' at C:/strawberry/perl/site/lib/Image/Compare.pm line 162. Can anyone help me resolve the issue.

[Anonymous Monk]

Its because single quotes do not interpolate while double quotes do interpolate. perlintro and Modern Perl explain interpolation.

[Anonymous Monk]

Do not use any quotes at all for single variables. Write:

img => $args[0],

[balajinagaraju]

Thanks for your reply , it works fine now.