To read Image from csv file

Hello,

i want to read 700 images and store them in .csv file in only one column formate then show these one column formated images into matlab.

[DGM]

If you want the a rectangular image in a single-column format, then there's no obvious way to describe what the original image geometry was. That information would either need to be in the file header, a separate header file, or simply presumed by some convention.

Given that there probably isn't a good reason to store images as CSV unless it's for sake of compatibility with some other software, then the format required by said software is something that must be known in order to create a compatible file.

So what is the required format?

Answer 1

[Image Analyst]

See attached code that puts image values into a CSV file. Adapt as needed.

To process a sequence of files, see the FAQ:

https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files?

[Sara Ejaz]

Thank You for your response but i a beginner in matlab and i need some time to understand this.

[Image Analyst]

Shouldn't take very long because it's pretty simple. So, did you understand it? Maybe you could explain why you want all the values in a CSV file.

[Sara Ejaz]

i have a retinal images dataset with 50 diseases i want to classify them.

for this first i want to apply machine learning alogorithm on numeric data which i take from theses images by using imread function.

all this data is converted into column formate.

[Image Analyst]

@Sara Ejaz so I'm guessing you got it solved with my hint and got something like this:

% Process a sequence of PNG images.
filePattern = fullfile(pwd, '*.png');
imds = imageDatastore(filePattern) % Create an image Datastore
% Get all filenames into one cell array.  Filenames have the complete path (folder prepended).
allFileNames = imds.Files;
numFiles = numel(imds.Files);
for k = 1 : numel(allFileNames)
    % Get this file name.
    fullFileName = allFileNames{k};
    fprintf('Processing %s\n', fullFileName);
    % Now read in image with imread.
    rgbImage = imread(fullFileName);
    % Split apart into spearate color channels.
    [r, g, b] = imsplit(rgbImage);
    % Make into column format.
    data = [r(:), g(:), b(:)];
    % Create output filename for this image's CSV file.
    outputFileName = strrep(fullFileName, '.png', '.csv');
    % Write out the data.
    writematrix(data, outputFileName);
end

If you also need x and y, see how I did it in the attached demo.

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