comparing two images & imaqImageToArray

[paulb1]

 Hi,

I'm looking to compare two images, looking for a result of 0-100% on how they match, originally I was coverting my image to an array,  with the code below, but this is taking far to long. From what your saying, we can use the 2-D array returned as pointers, but how can I compare this way. I originally intended to Subtract one from the other and get the difference.

Any ideas

I'm using the 1405 vidieo cards with CVI 8 (don't  have the NI Vision software)

    myImage= imaqSnap (Sid,myImage , IMAQ_NO_RECT);
    imaqDisplayImage (myImage, 0, TRUE);
   
    myImage1= imaqSnap (Sid,myImage1 , IMAQ_NO_RECT);
    imaqDisplayImage (myImage1, 0, TRUE);

   
    convertedData = imaqImageToArray (myImage, IMAQ_NO_RECT, &columns, &rows); 
    convertedData1 = imaqImageToArray (myImage1, IMAQ_NO_RECT, &columns, &rows); 

   
    *convertedData1

      // for (j=0; j<rows; j++)
      // {
       //  for (i=0; i<columns; i++)
      //  {
      //   //fills a 2-D array with original pixel values plus a user-defined constant offset
      //   data[j][i] = *convertedData + val;
      //   convertedData++;  //moves to the next original pixel in the array
      //  }
      // }