I want to convert two image files into strings and than to compare them. This is easy, but how to mention where the difference exist?

I have two image file in bmp file format. How to convert them into string and to check if they are differnt or same. If different how to mention or find that where the difference exists. This idea have to be extented with video application as well.

Hi,
if you have vision, you could use the functin IMAQ Image to Array to have a 2D array of the pixel values.
You can then compare pixel by pixel; if your images come from a camera, I would recommend to set a treshold of acceptance.
This is a time consuming solution anyway.
Alternative methods:
1) Make a subtraction of the two images, the resulting image will be the difference of them
2 ) Use IMAQ LogDiff function (operators palette)
3) Calculate the histogram of both image and compare the histogram reports
Good luck,
Alberto

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9 H2$4$ D$451 9*@,++                                                              "
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