error in processing multiple images in a loop code

Neo
2022 7 6
2 个回答
回答已采纳
更新时间：2022 7 6
5 次查看（30 天）

0 个投票

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!!

3 个评论
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Jan
Jan 2022-7-6
Please use the tools for formatting text and code differently. Thanks.
Neo
Neo 2022-7-6
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!!

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 采纳的回答

Image Analyst
Image Analyst 2022-7-6

1 个投票

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)

3 个评论
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Neo
Neo 2022-7-6
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
Image Analyst 2022-7-6
编辑：Image Analyst 2022-7-6
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
Neo 2022-7-6
Hallejuah!
It works!!! Thank you Image Analyst!

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更多回答（1 个）

Jan
Jan 2022-7-6

0 个投票

I assume this was meant:
[~, filename, ~] = fileparts(filenames);
% ^^^^^ instead of fileinfo

1 个评论
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Neo
Neo 2022-7-6
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

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