I want to loop reading in several images. and then perform analysis on those images.

At the moment I have a body of code that can read in all JPG images inside a file.

What I want to do is essentially take an average image of all the images that have been read in (by adding up all the seperate images matrix values) i can only do this manually at the minute (can't figure out how to loop),

Finally (The Most Important) plot a graph that shows how the value of the change of the sum image fluctuates over time, so for example image 1 is a dim image, image two is an extremely bright image, image 3 is a dim image - the graph should show a fluctuation from low to high to low again - I attempted this but received results in the RGB field - so it doesnt display correctly.

Here is my code below:

ImageFolder = 'H:\My Documents\Dissertation';

if ~isfolder(ImageFolder)

ErrorMessage = print('Error: The following folder does not exist: Please specify a new folder.', ImageFolder);

uiwait(warndlg(ErrorMessage));

ImageFolder = uigetdir();

if ImageFolder == 0

return;

end

end

FileType = fullfile(ImageFolder, '*.jpg');

TheImages = dir(FileType);

for k = 1:length(TheImages)

baseFileName = TheImages(k).name;

fullFileName = fullfile(TheImages(k).folder, baseFileName);

imageArray = imread(fullFileName);

fprintf(1, 'Now reading %s\n', fullFileName);

imshow(imageArray);

drawnow;

end

OriginalImage = imread('Img000000.jpg');

SecondImage = imread('Img000001.jpg');

ThirdImage = imread('Img000002.jpg');

FourthImage = imread('Img000003.jpg');

FifthImage = imread('Img000004.jpg');

SixthImage = imread('Img000005.jpg');

SeventhImage = imread('Img000006.jpg');

Image8 = imread('Img000007.jpg');

Image9 = imread('Img000008.jpg');

sumImage = OriginalImage + SecondImage + ThirdImage + FourthImage + FifthImage + SixthImage + SeventhImage + Image8 + Image9;

for i = 2:length(TheImages)

rgbImage = imread(fullFileName);

end

meanImage = sumImage / length(TheImages);

imshow(sumImage)

plot(meanImage)

Answer 1

[Paul Hoffrichter]

sumImage = OriginalImage + SecondImage + ThirdImage + FourthImage + FifthImage + SixthImage + SeventhImage + Image8 + Image9;

You are adding up uint8 data types which is in the range 0..255. So you are truncating to 255. Look at the sumImage values. Most will likely be 255.

>> OriginalImage = imread('Img000000.jpg');

Change all the images like this:

OriginalImage = double( imread('Img000000.jpg') );

and the numbers will add up better.

[Image Analyst]

And then

meanImage = sumImage / length(TheImages);
imshow(meanImage, []); % Use [] because it's outside the range of 0-1 and it's a floating point number, not a uint8
%plot(meanImage) % Do NOT call plot with images!

Not sure what the point of the for loop is if you're just going to overwrite the array inside the loop and then not even use it later because you read the 9 images individually.