Don't use imsave(). And don't use path as the name of the variable - it's a very important built in global variable.
Try it this way, which has tons of improvements (like better variable names, using imwrite(), etc.).
inputFolder = 'C:\Users\ChawlaV\Desktop\MATLAB\CNN Input 2\Alligator Cracks';
outputFolder = 'C:\Users\ChawlaV\Desktop\MATLAB\CNN MF\Alligator Cracks';
fileListing = dir (fullfile(inputFolder,'*.png'));
for k = 1: numel(fileListing)
% Get the input filename.
inputFullFileName = fullfile (inputFolder, fileListing(k).name);
% Read in the original image from disk.
grayImage = imread (inputFullFileName);
% Display the image
subplot(1, 2, 1);
imshow(grayImage);
% Check to see if it's grayscale, like it should be.
if ndims(grayImage) == 3
% It's color. Need to convert it to gray scale.
grayImage = rgb2gray(grayImage);
end
% Median filter the image.
MFImage = medfilt2(grayImage);
% Display the image
subplot(1, 2, 2);
imshow(MFImage);
drawnow; % Force update.
% Save the image to the output folder.
fullFileName = fullfile(outputFolder, fileListing(k).name);
imwrite(MFImage, fullFileName);
end
