error in processing multiple images in a loop code

hello,

a reknowned responder (walter robinson) suggested the following code to process multiple images and count blobs and then sum them together:

dinfo = dir('.jpg');
filenames = {dinfo.name};
numfiles = length(filenames);
count = zeros(numfiles, 1);
for K = 1 : numfiles
    MyRGBImage = filenames{K};
    imageData = imread(MyRGBImage);
    bw = im2bw(imageData);
    bw = bwareafilt(bw, [10 inf]);
    [~, numcircles] = bwlabel(bw);
    circle_count(K) = numcircles;
end
[~, filename, ~] = fileinfo(filenames);
info_table = table(filename, circle_count);
finalcount = sum(circle_count);
disp(info_table)

But i keep getting an error:

Unrecognized function or variable 'fileinfo'.

Error in loopcount (line 13)

[~, filename, ~] = fileinfo(filenames);

I changed it to filepart or imfinfo but then I got:

Error using imfinfo

Too many output arguments.

Error in loopcount (line 13)

[~, filename, ~] = imfinfo(filenames);

so I changed it to fileparts and I got:

Error using table

All table variables must have the same number of rows.

Error in loopcount (line 14)

info_table = table(filename, circle_count);

Can someone please help me figure out what is going on here?

Thank you!!

[Jan]

Please use the tools for formatting text and code differently. Thanks.

[Walter Roberson]

dinfo = dir('*.jpg');

[Neo]

Hey Walter!!

Thanks that helped but after I uploaded my two test images (just to try it out), I got the following:

filename circle_count

___________ ____________

{1×29 cell} 1×29 double

It should say the number of blobs in each cell as a sum but it seems to put out the structure of the array instead?

Thanks!!

Answer 1

[Image Analyst]

Try this. It works fine:

directoryInfo = dir('*.jpg');
allFileNames = {directoryInfo.name};
numfiles = length(allFileNames)
circle_count = zeros(numfiles, 1);
for k = 1 : numfiles
    fprintf('Processing file #%d of %d : "%s".\n', k, numfiles, allFileNames{k});
    MyRGBImage = allFileNames{k};
    imageData = imread(MyRGBImage);
    bw = im2bw(imageData); % Binarize the image.
    bw = bwareafilt(bw, [10 inf]); % Extract only blobs 10 pixels and larger.
    % Count the number of blobs.
    [~, numCircles] = bwlabel(bw);
    % Save the number of blobs.
    circle_count(k) = numCircles;
end
% Stuff arrays into a table variable.
info_table = table(allFileNames(:), circle_count, 'VariableNames', {'FileName', 'CircleCount'});
finalcount = sum(circle_count)
disp(info_table)

[Neo]

Thank you Image Analyst!!

I think that I am missing something critical in this line:

directoryInfo = dir('*.jpg ');

allFileNames = {directoryInfo.name};

numfiles = length(allFileNames)

circle_count = zeros(numfiles, 1);

the code's product output is:

numfiles =

0

finalcount =

0

(this happens even once I change *.jpg to test1.jpg)

the idea would be that once I put in one name, test1 for ex, the code would automatically process the other images that are in chronological order eg. test 2, test3, test4 etc.

I suppose that I would use a for loop for k = 1 : 2 (for two images) but how could i incorporate that into the directoryinfo snippet part of the code? I don't want to change it too drastically.

[Image Analyst]

Yeah, because test1.jpg does not exist in your current folder. Why would you change it to a single file when you wanted to do all the files? Put it back to *.jpg or *.jp* if you have both .jpg and .jpeg files.

Try this if you want sequential:

numFiles = 2;
circle_count = zeros(numfiles, 1);
for k = 1 : numfiles
    thisFileName = sprintf('Test%d.jpg', k);
    if isfile(thisFileName)
        fprintf('Processing file #%d of %d : "%s".\n', k, numfiles, thisFileName);
        imageData = imread(thisFileName);
        bw = im2bw(imageData); % Binarize the image.
        bw = bwareafilt(bw, [10 inf]); % Extract only blobs 10 pixels and larger.
        % Count the number of blobs.
        [~, numCircles] = bwlabel(bw);
        % Save the number of blobs.
        circle_count(k) = numCircles;
    else
        warningMessage = sprintf('File not found:\n%s', thisFileName);
        fprintf('%s\n', warningMessage);
        uiwait(warndlg(warningMessage));
    end
end
% Stuff arrays into a table variable.
info_table = table(allFileNames(:), circle_count, 'VariableNames', {'FileName', 'CircleCount'});
finalcount = sum(circle_count)
disp(info_table)

[Neo]

Hallejuah!

It works!!! Thank you Image Analyst!

Answer 2

[Jan]

I assume this was meant:

[~, filename, ~] = fileparts(filenames);
%                      ^^^^^  instead of fileinfo

[Neo]

yes, so i changed it to:

dinfo = dir('.jpg');
filenames = {dinfo.name};
numfiles = length(filenames);
count = zeros(numfiles, 1);
for K = 1 : numfiles
    MyRGBImage = filenames{K};
    imageData = imread(MyRGBImage);
    bw = im2bw(imageData);
    bw = bwareafilt(bw, [10 inf]);
    [~, numcircles] = bwlabel(bw);
    circle_count(K) = numcircles;
end
[~, filename, ~] = fileparts(filenames);
info_table = table(filename, circle_count);
finalcount = sum(circle_count);
disp(info_table)

I still get an error