An object with the biggest amount of scope in the Binary image

조회 수: 3 (최근 30일)
Felix
Felix 2013년 9월 12일
Hello, I have a binary image with n white objects (not connected). How can I leave only the object with the biggest amount of scope in the picture I can do it by - bwareaopen, but in this way I have to know approximate size of an object. sorry for my english. thnx

채택된 답변

Image Analyst
Image Analyst 2013년 9월 13일
Try this:
grayImage = imread('coins.png');
subplot(2,2,1);
imshow(grayImage);
binaryImage = grayImage > 100;
binaryImage = imfill(binaryImage, 'holes'); % Fill holes.
[labeledImage, numObjects] = bwlabel(binaryImage);
stats = regionprops(labeledImage,'Area');
allAreas = [stats.Area]
[~, indexOfLargest] = max(allAreas);
largestBlob = ismember(labeledImage, indexOfLargest)>0;
subplot(2,2,2);
imshow(largestBlob);
title('Largest');
keeperIndexes = 1:numObjects;
keeperIndexes(indexOfLargest) = [];
binaryImage2 = ismember(labeledImage, keeperIndexes)>0;
subplot(2,2,3);
imshow(binaryImage2);
title('All Except Largest');

추가 답변 (2개)

Adam Filion
Adam Filion 2013년 9월 12일
편집: Adam Filion 2013년 9월 12일
If you have Image Processing Toolbox you can use the function regionprops. It comes out to something like this, where tm is the binary image.
cc = bwconncomp(tm);
stats = regionprops(cc,'Area');
A = [stats.Area];
[~,biggest] = max(A);
tm(labelmatrix(cc)~=biggest) = 0;
You can watch a recorded presentation that steps through a similar example here:
  댓글 수: 2
Felix
Felix 2013년 9월 12일
편집: Image Analyst 2013년 9월 13일
Thanks for the help, it close enough to what I asked, however, it erased all the small arias except the closest ones to the object . can you tall me why is that? sorry i can't upload an image, can i send it to your e-mail?
Image Analyst
Image Analyst 2013년 9월 13일
편집: Image Analyst 2013년 9월 13일
Try uploading an image to http://snag.gy or http://tinypic.com.

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Sean de Wolski
Sean de Wolski 2013년 9월 17일
Good timing, I just posted this function a few minutes ago!

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