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Code detecting false objects

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learningmatlab
learningmatlab on 20 May 2020
Commented: darova on 21 May 2020
On the left is the original image and on the right objects are being detected. Please advise. Also, there is another image in which I use the same code and it detects only one object. Why is this happening? I have attached that image as well.
clear all
close all
img= imread("C:\Users\0000_012_14px_prergb.tif");
imshow (img)
img=rgb2gray(img);
b=imbinarize(img); %binary image
imshow(b)
img1 = bwareafilt(b,[20 1000]); %retains objects pixel area
c=bwlabel(img1);
imshow(c)
measurements = regionprops(c,img, 'MeanIntensity'); %measurements = regionprops(labeledImage, grayscaleImage, 'MeanIntensity');
stats = regionprops('table',img1,'Centroid','MajorAxisLength','MinorAxisLength') %object detection
centers = stats.Centroid;
diameters = mean([stats.MajorAxisLength stats.MinorAxisLength],2);
radii = diameters/2;
hold on
viscircles(centers,radii); %drawing around the object
hold off
num_obj=height (stats)%finding the number of objects

Answers (1)

darova
darova on 20 May 2020
Use threshold to find appropriate objects
th = threshold(img);
% bw = im2bw(img,th);
bw = im2bw(img,th+0.1);
  3 Comments
learningmatlab
learningmatlab on 21 May 2020
Edited: learningmatlab on 21 May 2020
I have to analyze a set of images, will it work on all of them? These two images are from the same set. Also, there is no such function as "threshold" in Matlab.
darova
darova on 21 May 2020
  • I have to analyze a set of images, will it work on all of them?
Yes
  • Also, there is no such function as "threshold" in Matlab.
Sorry, i mean graythresh()

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