how to mark pixel as zero
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Hi all
I have a segmented image i want to process only the larger segment. so i want to make the remaining pixels as zero. Please help me how i can do it.
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Image Analyst
2012년 7월 24일
You don't need to make the remaining pixels zero in order to measure the largest "segment".
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Image Analyst
2012년 7월 23일
Use regionprops to get the areas then get them all in an array so you can determine the largest.
measurements = regionprops(labeledImage, 'Area');
allAreas = [measurements.Area];
[sortedAreas sortIndexes] = sort(allAreas);
% Then mask your image or create a new one from the largest blob.
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Image Analyst
2012년 7월 24일
편집: Image Analyst
2012년 7월 24일
You can get the largest region. It's sortIndexes(1). Just extract the label for the largest image with ismember(). Then turn it into a binary image and use that to "mark all pixels as zero except largest region" in your original image.
biggestLabel = ismember(labeledImage, sortIndexes(1));
binaryImage = biggestLabel > 0;
% If you want the original image masked:
maskedImage = grayImage;
maskedImage(~binaryImage) = 0;
If this code doesn't work for you, let me know tomorrow and maybe I can adapt my blobs demo (in my File Exchange) to find the largest blob. But like I said in the comment, you don't need to zero anything out to get the measurements of the largest blob, so I don't know why you think you do, unless you just want to display it for curiosity's sake.
Image Analyst
2012년 7월 24일
Muhammad, you can color your labels like this, instead of all that code you gave in your comment below:
labeledImage = bwlabel(binaryImage, 8); % Label each blob so we can make measurements of it
coloredLabels = label2rgb (labeledImage, 'hsv', 'k', 'shuffle'); % pseudo random color labels
imshow(coloredLabels);
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jagadeeshwar
2012년 7월 23일
hai imran just crop the image which segment u want it can be enlarge after crop operation
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