MATLAB: Why did not accept the JPEG image in matlab

image processing

sir i have doubt in why did not accept the JPEG image in matlab during read the images.

Best Answer

%Example

folder=E:\matlab
filename='imag1.jpg'
f=fullfile(flder,filename)
im=imread(f)

If your code is not working, maybe the image is not in the current folder. Can you post the error message

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MATLAB: Comparing single image with many images

How do you define a match? If all pixels are the same, and only one single pixel is different by only 1 gray level? Is that a match or not a match? If you say that's not a match, then first just compare the number of rows, columns, and color channels. Then if all those match, simply subtract the image (after converting to floating point) and look for any non-zero values with nnz();

diffImage = single(image1) - single(image2);
imagesMatch = nnz(diffImage(:)) == 0;

MATLAB: How to Search images Automatically from “My Pictures ” folder

See this code to recurse into subfolders and find image files:

% Start with a folder and get a list of all subfolders.
% Finds and prints names of all PNG and TIF images in 
% that folder and all of its subfolders.
clc;    % Clear the command window.
workspace;  % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
% Define a starting folder.
start_path = fullfile(matlabroot, '\toolbox\images\imdemos');
% Ask user to confirm or change.
topLevelFolder = uigetdir(start_path);
if topLevelFolder == 0
  return;
end
% Get list of all subfolders.
allSubFolders = genpath(topLevelFolder);
% Parse into a cell array.
remain = allSubFolders;
listOfFolderNames = {};
while true
  [singleSubFolder, remain] = strtok(remain, ';');
  if isempty(singleSubFolder)
    break;
  end
  listOfFolderNames = [listOfFolderNames singleSubFolder];
end
numberOfFolders = length(listOfFolderNames)
% Process all image files in those folders.
for k = 1 : numberOfFolders
  % Get this folder and print it out.
  thisFolder = listOfFolderNames{k};
  fprintf('Processing folder %s\n', thisFolder);
  
  % Get PNG files.
  filePattern = sprintf('%s/*.png', thisFolder);
  baseFileNames = dir(filePattern);
  % Add on TIF files.
  filePattern = sprintf('%s/*.tif', thisFolder);
  baseFileNames = [baseFileNames; dir(filePattern)];
  numberOfImageFiles = length(baseFileNames);
  % Now we have a list of all files in this folder.
  
  if numberOfImageFiles >= 1
    % Go through all those image files.
    for f = 1 : numberOfImageFiles
      fullFileName = fullfile(thisFolder, baseFileNames(f).name);
      fprintf('     Processing image file %s\n', fullFileName);
    end
  else
    fprintf('     Folder %s has no image files in it.\n', thisFolder);
  end
end

Of course if you're looking for one particular filename , then you can just break out of the loops once you've found it. Use strfind() or strcmpi() to check if the found filename matches the desired filename.

Best Answer

Related Solutions

MATLAB: Comparing single image with many images

MATLAB: How to Search images Automatically from “My Pictures ” folder

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