Hi Everyone,
I have several ROIs that represent different objects on the ground and in every ROI I have same number of pixels. But when I generate the confusion matrix, the Envi multiply the number of pixels in each ROI by 4. For instance, if I have a ground truth ROI that represent water and comprised of 10 pixels, I will see the "water" class in confusion matrix with total number of 40. I have tried many times and each time, Envi multiply it by 4 ( even when you have only 1 pixel in the ROI, it will show up as 4 in the confusion matrix).
Does any one know what is going on with ENVI and how does it generate the confusion matrix with ROIs?

Thanks.