how to remove object that contain more than X% black pixels

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Lukasz Jarod 2014-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/168188-how-to-remove-object-that-contain-more-than-x-black-pixels

评论： Image Analyst 2014-12-27

i have some roi and i want to remove roi that has more then 90% black pixels how can i do that???

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Answer 1

Image Analyst 2014-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/168188-how-to-remove-object-that-contain-more-than-x-black-pixels#answer_163379

编辑：Image Analyst 2014-12-26

在 MATLAB Online 中打开

Is your ROI in the form of a binary image? Are there multiple regions in that binary image? Just call regionprops and find blobs where the (FilledArea - Area) / FilledArea > 0.1.

labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'FilledArea', 'Area');
allAreas = [measurements.Area];
allFilledAreas = [measurements.FilledArea];
darkRatios = (allFilledAreas - allAreas) / allFilledAreas;
darkIndexes = find(darkRatios > 0.1);
newLabeledImage = ismember(labeledImage, darkIndexes);
% Relabel
labeledImage = bwlabel(newLabeledImage > 0);
% Measure again with new blobs.
measurements = regionprops(labeledImage, 'FilledArea', 'Area');

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Lukasz Jarod 2014-12-27

编辑：Lukasz Jarod 2014-12-27

well i dont understand what you doing in this code;/

http://i58.tinypic.com/amze38.jpg for example i have this image then for each labeled componetnt i do template matching but first i remove some of the object. and now i want to remove somehow boject on the left(as you can see object is almost 90% filld with black pixels and there is no letters that are 90% filled with black) maybe you could tell me step by step what hapens in your code , or it will not work for me now? or maybe there is another way to do it?