MATLAB: How to display image from system folders..??

pepper.pngsun.png

clear
[X1,map1]=imread('C:\Users\SONY\Downloads\abcd.jpg');
[X2,map2]=imread('C:\Users\SONY\Downloads\abcd.jpg');
subplot(1,2,1), subimage(X1,map1)
subplot(1,2,2), subimage(X2,map2)

Best Answer

Try using imshow() instead of subimage() (whatever that is):

clear
[X1, map1] = imread('C:\Users\SONY\Downloads\abcd.jpg');
[X2, map2] = imread('C:\Users\SONY\Downloads\abcd.jpg');
subplot(1, 2, 1);
imshow(X1, map1)
subplot(1, 2, 2);
imshow(X2, map2)
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'My Images', 'NumberTitle', 'Off')

You should really make it more robust by checking if the filenames exist first, with the exist(filename, 'file') function, before trying to call imread() and then warn the user if they don't exist:

filename = 'C:\Users\SONY\Downloads\abcd.jpg';
if exist(filename, 'file')
    [X1, map1] = imread('C:\Users\SONY\Downloads\abcd.jpg');
    subplot(1, 2, 1);
    imshow(X1, map1)
else
    warningMessage = sprintf('Warning: the image file does not exist:\n%s', filename);
    uiwait(warndlg(filename));
end

Related Solutions

MATLAB: Masking some desired portion of an image

It definitely DOES work, but you need to make your mask in the range 0-1. Here's proof:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clearvars;
workspace;  % Make sure the workspace panel is showing.
fontSize = 20;
format compact;
% Read in a standard MATLAB color demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'peppers.png';
fullFileName = fullfile(folder, baseFileName);
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
  % Didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
rgbImage = imread(fullFileName);
% Get the dimensions of the image.  numberOfColorBands should be = 3.
[rows columns numberOfColorBands] = size(rgbImage);
% Display the original color image.
subplot(2, 2, 1);
imshow(rgbImage, []);
title('Original Color Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]); % Maximize figure.
mask = zeros(rows, columns, 'uint8');
mask(30:300, 50:150) = 1;
% Normalize to 0 - 1.
mask = mask / 255;
% Display the mask.

subplot(2, 2, 2);
imshow(mask, []);
title('Mask', 'FontSize', fontSize);
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask,class(rgbImage)));
% Display the mask.
subplot(2, 2, 3);
imshow(maskedRgbImage, []);
title('MaskedImage', 'FontSize', fontSize);

MATLAB: How to read multiple image from a folder and create histogram for each image and save them ?

srcFiles = dir('C:\Users\sony\Desktop\matlabprog\ORL Face Database\s1\*.pgm');
N = 10 ;
iwant = cell(N,1) ;
for i = 1 : N
    filename = strcat('C:\Users\sony\Desktop\matlabprog\ORL Face Database\s1\',srcFiles(i).name);
    if exist(filename, 'file') == 0
        continue
    end
    Image = imread(filename);
    Img = im2bw(Image);
    figure(),imshow(Img);
    %%Take histogram 
    iwant{i} = imhist(I) ;
end

Best Answer

Related Solutions

MATLAB: Masking some desired portion of an image

MATLAB: How to read multiple image from a folder and create histogram for each image and save them ?

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