how to get the mean of different images covered the same area?

i have 7 days precipitation data images(tif format)of same area.i want to get the average of this seven images.(pixel wise average) it means average image of this 7 images.how to do it?

Answer 1

[Image Analyst]

Try this:

averageImage = (double(image1) + double(image2) + double(image3) + double(image4) + double(image5) + double(image6) + double(image7)) / 7;

Then to get the mean, it depends on how the area is defined. If it's a box, then you can use mean2().

meanValue = mean2(averageImage(row1:row2, col1:col2));

If it's a binary mask

meanValue = mean(averageImage(maskImage));