MATLAB: What is the problem in the for loop

for loopimage processingImage Processing Toolbox

I've a problem in the for loop to extract texture features of images of a folder. The problem is in this line:

Im2=ComputeRankTransform(filename);

Can anyone please help me to access all images??

 clc;
Im1=ComputeRankTransform('bi4.jpg');
folder = fullfile('E:\4-2\Thesis_codes\texture\code\dependencies');
srcFiles = dir(fullfile(folder, '*.jpg')); 
for i = 1 : length(srcFiles)   
    % determins how many images are there in the folder,
  filename = fullfile(folder,srcFiles(i).name);
  thisImage = imread(filename);
    Im2=ComputeRankTransform(thisImage);
  sizeOfIm1=size(Im1);
    sizeOfIm2=size(Im2);
    if(sizeOfIm1==sizeOfIm2)
        if(Im1==Im2)
            fprintf('Yes\n');
       else
            fprintf('No\n');
        end
    else
        fprintf('No Dimension\n');
    end
end

Best Answer

That is hard to tell based on the information you provide. However, here are some links on debugging in Matlab

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One of your images is not the same size as the others. You have an imresize() there that would take care of that problem, but you have that imresize() commented out.

MATLAB: What is the mistale in the loop

Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 25;
% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'cameraman.tif';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
  % File doesn't exist -- didn't find it there.  Check the search path for it.
  fullFileNameOnSearchPath = baseFileName; % No path this time.
  if ~exist(fullFileNameOnSearchPath, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
referenceGrayImage = imread(fullFileName);
% Get the dimensions of the image.
% numberOfColorBands should be = 1.
[rows, columns, numberOfColorBands] = size(referenceGrayImage);
if numberOfColorBands > 1
  % It's not really gray scale like we expected - it's color.
  % Convert it to gray scale by taking only the green channel.
  referenceGrayImage = referenceGrayImage(:, :, 2); % Take green channel.
end
% Display the original gray scale image.

subplot(2, 2, 1);
imshow(referenceGrayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')
% Let's compute and display the histogram.
[pixelCount, grayLevels] = imhist(referenceGrayImage);
subplot(2, 2, 2);
bar(grayLevels, pixelCount);
grid on;
title('Histogram of original image', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.
srcFiles = dir(fullfile(folder, '*.jpg')); %directory of the source folder
Im1 = im2double(referenceGrayImage); % Calculate the Normalized Histogram
hn1 = imhist(referenceGrayImage)./numel(referenceGrayImage);
for i = 1 : length(srcFiles)      % determins how many images are there in the folder,
  filename = fullfile(folder,srcFiles(i).name)
  thisImage = imread(filename);
  % Display the original gray scale image.
  subplot(2, 2, 3);
  imshow(thisImage);
  title(filename, 'FontSize', fontSize);
  drawnow;
  Im2=rgb2gray(thisImage);
  Im2 = im2double(Im2);
  hn2 = imhist(Im2)./numel(Im2);
  
  % Calculate the histogram error

  f(i) = sum((hn1 - hn2).^2);% Calculate the histogram error
  f(i) %display the result to console  
  
  promptMessage = sprintf('f=%f\nDo you want to Continue processing,\nor Cancel to abort processing?',f(i));
  titleBarCaption = 'Continue?';
  button = questdlg(promptMessage, titleBarCaption, 'Continue', 'Cancel', 'Continue');
  if strcmpi(button, 'Cancel')
    break;
  end
end

Best Answer

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