I new to matlab and image analysis. I want to measure average width (also min and max width) and and area of this probe. can anyone help me how to do this? thanks.

I want to measure this Image

Answer 1

[yanqi liu]

sir，please check the follow code to get some information

for more information,you can read the book 《计算机视觉与深度学习实战》，Thank you！

clc; clear all; close all;
img = imread('https://ww2.mathworks.cn/matlabcentral/answers/uploaded_files/767536/Diameter21.jpg');
im = rgb2gray(img);
bw = imbinarize(im,'adaptive','ForegroundPolarity','dark','Sensitivity',0.6);
bw = imclose(bw, strel('line', 19, 90));
bw = bwareaopen(bw, 2000);
[L,num]=bwlabel(bw);
stats = regionprops(L);
ar = cat(1, stats.Area);
[~,ind] = sort(ar);
bw = L==ind(1)|L==ind(2);
im1 = im; im2 = im; im3 = im;
im1(bw) = 255; im2(bw) = 0; im3(bw) = 0;
imt = cat(3,im1,im2,im3);
figure; imshow(bw);

figure; imshow(imt);

% width
wid = [];
for i = 1 : size(bw,1)
    ri = bw(i,:);
    indi = find(ri);
    wid(i) = indi(end)-indi(1);
end
% max、min、average
max_width = max(wid)

max_width = 329

min_width = min(wid)

min_width = 295

average_width = mean(wid)

average_width = 305.8774

[Dinesh Dhameliya]

Hi yanqi liu,

thanks for your valable time and answer. but this code is working on only on upper Image but for other Images not working. I uploded image here. And above mentioned book is available in English?

thanks again.