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How can i extract all labeled objects in a image and save every object as an image?

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I have labeled 650 images in Image labeler. Now i want to save every object i have labeled as a 81X81 pixel image.How can i do that?

Risposte (1)

Daniel Vieira
Daniel Vieira il 21 Feb 2020
with the image labeler you made a table where the first column is the image file, and the others are each label, each cell containing the bounding boxes of each object. So:
% T -> your table
for k=1:height(T)
I=imread(T.file{k}); % I don't quite remember it the variable is "file", change it to the name of your 1st variable
for h=2:width(T)
for z=1:size(T{k,h},1)
subI=imresize(imcrop(I,)T{k,h}(z,:),[81 81]);
writeimage(subI,"file "+k+" "+h+" "+z+".png") % change this string to something suitable to you
end
end
end
  3 Commenti
Toni Vukasinovic
Toni Vukasinovic il 24 Feb 2020
I have done the following as you segested.
for k=1:height(gTruth)
I=imread(gTruth.LabelData{k}); % I don't quite remember it the variable is "file", change it to the name of your 1st variable
for h=2:width(gTruth)
for z=1:size(gTruth{k,h},1)
subI=imresize(imcrop(I,),gTruth{k,h}(z,:),[81 81]);
writeimage(subI,"file "+k+" "+h+" "+z+".png") % change this string to something suitable to you
end
end
end
But I get the following error
subI=imresize(imcrop(I,),gTruth{k,h}(z,:),[81 81]);
Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for
mismatched delimiters.
Daniel Vieira
Daniel Vieira il 26 Feb 2020
gTruth here is not a table, it's a groundTruth object, that's why the code above doesn't work for you. You either need the Image Labeler App to export things in table format instead of gTruth (almost sure it does it), or you need to access the inner properties of gTruth, make a table, and work with it.

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