how to set threshold value for comparing images in matlab?
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how do I compare one image for example Z with multiple images in a folder and find out the one which matches closely to the image Z.
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Answers (2)
Image Analyst
on 15 Feb 2015
You develop an algorithm. That's about all I can say, given the (lack of) information you've provided. Please read this and provide more info.
4 Comments
Image Analyst
on 16 Feb 2015
Not that I'm aware of. You might be able to use a twain interface or java robot but I can't help you there.
Pranav Shukla
on 28 Mar 2023
Edited: DGM
on 28 Mar 2023
close all;
clc;
path='C:\Users\Vinayak Shukla\Documents\MATLAB\MATLAB PROJECTS\MASTER THESIS FOLDER 2023\happy15_encrpted4.bmp';
list=dir([path, '*.jpg']);
img=imread('C:\Users\Vinayak Shukla\Documents\MATLAB\MATLAB PROJECTS\MASTER THESIS FOLDER 2023\happy15_encrpted4.bmp');
%image to compare with X1=rgb2ind(img,16);
forx=1:length(list);
images{x}=imread([path, list(x).name]);
X2=rgb2ind(images{x},16);
c=corr2(X1,X2);
figure(x);
subplot(1,2,1),imshow(images{x}), xlabel(['Image ',num2str(x)]);
subplot(1,2,2),imshow(img);
if c==1
xlabel('The images are same.');
else
xlabel('The images are not same');
end
This is the error i am getting
Unrecognized function or variable 'x'.
Error in pranav17 (line 8)
images{x}=imread([path, list(x).name]);
6 Comments
Pranav Shukla
on 30 Mar 2023
Edited: DGM
on 30 Mar 2023
basepath = fullfile(matlabroot,'toolbox/images/imdata');
filenameexpr = '(C:\Users\Vinayak Shukla\Documents\MATLAB\MATLAB PROJECTS\MASTER THESIS FOLDER 2023\happy15_encrpted4.bmp)';
matchingfiles = dir(fullfile(basepath,filenameexpr));
Xref = imread(fullfile(matchingfiles().folder,matchingfiles().name));
numimages = numel(matchingfiles);
imagestack = cell(numimages,1); % preallocate
for k = 1:numimages
thispath = fullfile(matchingfiles(k).folder,matchingfiles(k).name);
Xtest = imread(thispath);
% store it if necessary
% if you don't need to keep them for later, don't bother
imagestack{k} = Xtest;
% test it somehow (corr2, immse, isequal)
c = immse(Xref,Xtest); % mean-square error
% generate a pile of figures
figure(k);
subplot(1,2,1),imshow(Xtest), xlabel(['Image ',num2str(k)]);
subplot(1,2,2),imshow(Xref);
if c==0 % if error is zero
xlabel('The images are same.');
else
xlabel('The images are not same');
end
end
>> pranav17
Error using fullfile
Not enough input arguments.
Error in pranav17 (line 26)
Xref = imread(fullfile(matchingfiles().folder,matchingfiles().name));
could some please rewrite the whole code again in a simplified manner, and post it here.
the code should be how to compare the threshold value of two images?
please help me out.
Image Analyst
on 30 Mar 2023
You have to give it an index of course. Is the reference your first image? If so,
Xref = imread(fullfile(matchingfiles(1).folder,matchingfiles(1).name));
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