Image processing code Help
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Anas Bilal
am 16 Apr. 2020
Kommentiert: Anas Bilal
am 17 Apr. 2020
NEED help to use imread for 20 images together. This code can work on 1 image at a time i want to use this code for all 20 images at once and want to save all images in one new folder after processing .Please can anyone help me to modify this code.
RGB=imread('1.jpg');
% input 768*576 pixel uint8 type true color image.
R=RGB(:,:,1);
% red surface image extraction
G=RGB(:,:,2);
B=RGB(:,:,3);
figure;
imshow(RGB)
title('original image');
% create a new empty graphics window
% view images
figure,
imshow(R)
title('red face version');
figure,
imshow(G)
title('green face version');
figure,
imshow(B)
3 Kommentare
Akzeptierte Antwort
Ameer Hamza
am 16 Apr. 2020
Bearbeitet: Ameer Hamza
am 16 Apr. 2020
See my answer here related to batch processing of csv files: https://www.mathworks.com/matlabcentral/answers/509790-read-and-manipulate-multiple-csv-files
Here is a general structure of the code
files = dir('*.jpg'); % get name of all files with jpg extension
for i=1:numel(files) % run the for loop over all images
name = files(i).name; % get name of i-th image file
img = imread(name); % load the image
R=RGB(:,:,1);
% red surface image extraction
G=RGB(:,:,2);
B=RGB(:,:,3);
imwrite(R, ['img' num2str(i) ' red.jpg']);
imwrite(G, ['img' num2str(i) ' green.jpg']);
imwrite(B, ['img' num2str(i) ' blue.jpg']);
end
This link also provide helpful information: https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F
20 Kommentare
Image Analyst
am 17 Apr. 2020
Anas: I've corrected your code. This works. Just uncomment the imwrite() lines:
folder = pwd; % Whever you want...
filePattern = fullfile(folder, '*.ppm');
files = dir(filePattern); % get name of all files with jpg extension
if numel(files) == 0
warningMessage = sprintf('No files found in folder\n%s.\n', folder);
fprintf('%s\n', warningMessage);
beep;
uiwait(errordlg(warningMessage));
return;
end
numberOfImageFiles = length(files)
for k = 1 : numberOfImageFiles % run the for loop over all images
baseFileName = files(k).name; % get name of i-th image file
fullFileName = fullfile(folder, baseFileName);
fprintf('Reading in file %d of %d : %s\n', k, numberOfImageFiles, fullFileName);
img = imread(fullFileName); % load the image
subplot(1, 2, 1);
imshow(img);
caption = sprintf('Original Image :\n%s', baseFileName);
title(caption, 'FontSize', 15, 'Interpreter', 'none');
[rows, columns, numberOfColorChannels] = size(img);
if numberOfColorChannels == 3
R = img(:, :, 1); % Red channel image extraction
G = img(:, :, 2);
B = img(:, :, 3);
% Write out RGB image as TIFF format.
outputBaseFileName = sprintf('img %d RGB.tif', k);
outputFullFileName = fullfile(folder, outputBaseFileName);
fprintf(' Writing file %s\n', outputFullFileName);
% imwrite(R, outputFullFileName);
% Write out red image as TIFF format.
outputBaseFileName = sprintf('img %d red.tif', k);
outputFullFileName = fullfile(folder, outputBaseFileName);
fprintf(' Writing file %s\n', outputFullFileName);
% imwrite(R, outputFullFileName);
% Write out green image as TIFF format.
outputBaseFileName = sprintf('img %d green.tif', k);
outputFullFileName = fullfile(folder, outputBaseFileName);
fprintf(' Writing file %s\n', outputFullFileName);
% imwrite(R, outputFullFileName);
% Write out blue image as TIFF format.
outputBaseFileName = sprintf('img %d blue.tif', k);
outputFullFileName = fullfile(folder, outputBaseFileName);
fprintf(' Writing file %s\n', outputFullFileName);
% imwrite(R, outputFullFileName);
else
% img is already a gray scale image.
G = img;
end
% Histogram equivilzation of Green Channel
b=adapthisteq(G);
% Two times limited contrast adaptive direct equalization
ba=adapthisteq(b);
% adjusts contrast in grayscale images.
subplot(1, 2, 2);
imshow(ba)
title('Enhanced contrast', 'FontSize', 15, 'Interpreter', 'none');
outputBaseFileName = sprintf('img %d enhanced.tif', k);
outputFullFileName = fullfile(folder, outputBaseFileName);
fprintf(' Writing file %s\n', outputFullFileName);
% imwrite(ba, outputFullFileName);
drawnow;
pause(0.5);
end
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