can you wirte a code in matlab which is using instead of nlfilter

MM=nlfilter(rgb2gray(n),Dsize,@redd,M,D,E,k);

enh=im2uint8(mat2gray(MM));

Answer 1

[Image Analyst]

Just have a for loop over all the images. I think it should go something like this:

for k = 1 : numberOfImages
    thisImage = imread(); % Read in your image somehow.
    [rows, columns, numberOfColorChannels] = size(thisImage)
    if numberOfColorChannels == 3
        thisImage = rgb2gray(thisImage);
    end
    MM = thisImage; % Preallocate to the same size as thisImage.
    for row = Dsize(1) : rows - Dsize(1) + 1
        for col = Dsize(2) : columns - Dsize(2) + 1
            % Get small patch of image.
            subImage = thisImage(row:row+Dsize(1) - 1, col:col+Dsize(2)-1);
            % Process this patch with the redd() function.
            MM(row, col) = redd(subImage);
        end
    end
end

[sana ch]

it shows this Error

Undefined function or variable 'numberOfImages'.

Error in my3Assignment (line 12)

for k = 1 : numberOfImages

[Image Analyst]

If you have only one image, get rid of the loop over all images.

    thisImage = imread(fullFileName); % Read in your image somehow.
    [rows, columns, numberOfColorChannels] = size(thisImage)
    if numberOfColorChannels == 3
        thisImage = rgb2gray(thisImage);
    end
    MM = thisImage; % Preallocate to the same size as thisImage.
    for row = Dsize(1) : rows - Dsize(1) + 1
        for col = Dsize(2) : columns - Dsize(2) + 1
            % Get small patch of image.
            subImage = thisImage(row:row+Dsize(1) - 1, col:col+Dsize(2)-1);
            % Process this patch with the redd() function.
            MM(row, col) = redd(subImage);
        end
    end

[sana ch]

now i get nothinng in my subimage

[Image Analyst]

OK, so what are your next steps for us? And don't just say "fix it" because you're not giving us anything to help you. No images, no code. What am I supposed to do?