How to measure % intensity difference between 2 image?

Hi,

May i know how to calculate the percentage intensity difference between 2 image of the same size. Then i need to apply this % of intensity different to another image of different size.

Answer 1

[David Young]

imDiff = image1 - image2;
imSum = image1 + image2;  
percentDiff = 200 * mean(imDiff(:)) / mean(imSum(:));

imAdjusted = (1 + percentDiff/100) * image3;

[Kyle]

yeah this works. However it prove my concept of normalizing image intensity for 2 image (for image mosaic application) wrong.

Thanks anyway. @@ now i got to think of another way of blending the image. As my final picture i can see a line tat where there is intensity different.

Do suggest if u have any idea.

Thanks

[Sean de Wolski]

Make sure image1 and image2 are both of class double before you subtract - else you'll get a whole bunch of zeros.

[Kyle]

yep i encountered that, when i tried the code. so i make the image to int16 so that it could store negative value as well.

Thanks

[suja rani]

why 200 is used for finding the percentage of difference