Is it possible to resize a region in a grayscale image?
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Tiffany Mao
le 27 Juin 2017
Modifié(e) : Gopichandh Danala
le 28 Juin 2017
Is it possible to resize a white blob in a grayscale image without changing anything else? If so, how can I do so? I am trying to resize the largest blob while keeping the size of the other regions the same.
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Gopichandh Danala
le 28 Juin 2017
Modifié(e) : Gopichandh Danala
le 28 Juin 2017
The steps for this is to extract the largest Blob, resize it as per requirement, again map it back to the original image to increase the size of it.
img = imread('blobDilate.jpg');
img = rgb2gray(img);
img(img < 50) = 0;
[rows, cols] = size(img);
figure, imshow(img), title('Original Image');
% Get the max Blob
largestBlob = bwareafilt(logical(img), 1);
figure, imshow(largestBlob)
% increase the size [+50, +50]of the Blob and remove the added rows, cols
resizeImg = imresize(largestBlob, [rows + 50, cols + 50]); % You can change this according your requirement
% remove added rows, cols
removeRows = [1:25, size(resizeImg,1)-24:size(resizeImg,1)];
removeCols = [1:25, size(resizeImg,2)-24:size(resizeImg,2)];
resizeImg(removeRows,:) = [];
resizeImg(:,removeCols) = [];
figure, imshow(resizeImg)
% New Blob Area
props = regionprops(logical(resizeImg),'Area');
resizedBlobArea = [props.Area];
fprintf('%s %d\n', 'newResizedBlobArea: ', resizedBlobArea)
% final Image
finalImg = logical(img + uint8(resizeImg));
figure, imshow(finalImg), title('Largest Blob resized Image')
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Image Analyst
le 28 Juin 2017
You know, you can get the largest blob simply by doing
largestBlob = bwareafilt(binaryImage, 1);
instead of all that stuff with regionprops(). largestBlob will be a binary image of the same size as the original but with only 1 blob, the largest, in it.
Gopichandh Danala
le 28 Juin 2017
Modifié(e) : Gopichandh Danala
le 28 Juin 2017
Oh thanks Image Analyst, I didn't knew it before. I updated the above answer
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