fill a particular blob with black

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i segment and get a binary image with "n" number of blobs, Suppose i want to fill a particular blob with black and save it as image 2... how to do it...
for k = 4 : 4
thisBlobsBoundingBox = blobMeasurements(k).BoundingBox;
bw = labeledImage == k;
what should i do to the bw... please reply

Accepted Answer

Takuji Fukumoto
Takuji Fukumoto on 27 Jan 2017
Please try this.
L = bwlabel(BW);
[r,c] = find(L == 4);
BW(r,c) = 0;

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