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How to extract the blob of gray image ?

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Jenifer NG
Jenifer NG 2023-2-18
评论： Jenifer NG 2023-2-23
Dear All ,
I want to extract blob of this image then measure the maximum major length.
I try some method but is is not work.
here is my code:
clc
clear
X = imread('img.tif')
X = imadjust(X);
% Threshold image - manual threshold
BW = im2gray(X) > 0;
% Open mask with disk
radius = 3;
decomposition = 0;
se = strel('disk', radius, decomposition);
BW = imopen(BW, se);
% Close mask with disk
radius = 5;
decomposition = 0;
se = strel('disk', radius, decomposition);
BW = imclose(BW, se)*255;
% imshow(BW)
props = regionprops(BW,'MajorAxisLength','BoundingBox')
[max_length, idx] = max([props.MajorAxisLength]);
% Get the bounding box of the biggest blob
bbox = props(idx).BoundingBox;
% Plot the rectangle around the biggest blob
figure;
imshow(BW);
hold on;
rectangle('Position', bbox, 'EdgeColor', 'r', 'LineWidth', 2);
Thanks and Regards!
Han

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采纳的回答

Image Analyst
Image Analyst 2023-2-19
I'd try some denoising first, like medfilt2 or imnlmfilt. Then I'd try adjusting the thresholds with my interactive thresholding app:
https://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image?s_tid=srchtitle
Then use bwferet. Don't use MaxAxisLength of regionprops since that gives you the max axis length of an ellipse fitted to the shape rather than the actual caliper distance like bwferet gives you.
  1 个评论
Jenifer NG
Jenifer NG 2023-2-23
Thanks you for your advice
I use the ImageSementer APP then app imcomplement then i can get the expected output by using bwferet .

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