how should i modify the below code so that i could be able to resize the grayscale image..instead of resizing the original image..please do guide me..

close all; clear all; clc;

for i=1:50 img =imread(['C:\Users\shree\Desktop\final data\target\' num2str(i) '.jpg']); evalc(['o' num2str(i) '=img;']); %original image

    evalc(['g' num2str(i) '=rgb2gray(img);']); %grayscale

    evalc(['r' num2str(i) '=imresize(img,[50 50]);']); %resized original image

end figure,imshow(o35); title('original'); figure,imshow(g35); title('gray'); figure ,imshow(r35); title('resized');

[Image Analyst]

Don't use evalc(). Don't create variables like that in a loop. Read this http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

Also, please read this: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Answer 1

[Image Analyst]

Try this:

folder = 'C:\Users\shree\Desktop\final data\target\';
counter = 1;
for k=1:50
  baseFileName = sprintf('%d.jpg', k);
  fullFileName = fullfile(folder, baseFileName);
  if exists(fullFileName, 'file')
    % If file exists, read it in.
    img =imread(fullFileName);
    imshow(img);
    drawnow; % Force it to display.
    o{counter} = img; %original image
    grayImage{counter} = rgb2gray(img); %grayscale
    % Resize gray scale image
    r{counter}=imresize(grayImage{counter}, [50 50]);
    % Increment counter
    counter = counter + 1;
  else
    message = sprintf('Warning: File does not exist:\n%s', fullFileName);
    uiwait(warndlg(message));
  end
end
% Display for image #35 only.
subplot(2,2,1);
imshow(o{35});
title('original');
subplot(2,2,2);
imshow(g{35});
title('gray');
subplot(2,2,3);
imshow(r{35});
title('resized');
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);

but I don't see why you're storing all those images in the first place, unless you need them later for some reason that's not shown.