The document describes how to load image data from multiple files, calculate the mean pixel value for each image, and save the results to a MATLAB data file. Specifically, it loops through numbers 1 to 10, constructs image file names by concatenating a file path with the number as a string, reads in each image, calculates the mean pixel value, and saves the values to a matrix M. It then saves M to a MATLAB data file called "MEANS.mat" and loads the data back into the variable MR.