Is there a way to clean the image such that the smaller pieces are not included?

Question

Teshan Rezel 2020-6-24

0
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https://ww2.mathworks.cn/matlabcentral/answers/553678-is-there-a-way-to-clean-the-image-such-that-the-smaller-pieces-are-not-included

回答： Puru Kathuria 2020-7-14

Hi,

I am working on thresholding an image (code included below). The threshold works well but includes several smaller pieces that are not helpful for the final analysis. Is there a way to get rid of these? Thanks in advance!

img = imread('25_04_2018_102541.JPG');
imgGrey = rgb2gray(img);
[counts, ~] = imhist(imgGrey, 255);
T = otsuthresh(counts);
BW = imbinarize(imgGrey, T);
BW = bwareaopen(BW, 3000);
BW = imfill(BW, 'holes');
BW = bwperim(BW);
BW = imdilate(BW, ones(5));
BW = imerode(BW, ones(3));
BW = imfill(BW, 'holes');
img(~BW(:,:,[1 1 1])) = 0;
baseGray = rgb2gray(img);
isoLower = 155;
isoUpper = 170;
mask = (baseGray > isoLower) & (baseGray < isoUpper);
img(~mask(:,:,[1 1 1])) = 0;