Code to identify a given image another image file

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Pradeep Sanjeewa
Pradeep Sanjeewa 2013-2-23
I'm given a target image(eg : a cross) and another image with several target images. Number of target images in the 2nd picture is also given(eg : 4). I need to find the coordinates of the target images in the second picture. images can be vieweed in my blog >> Matlab Files album
https://plus.google.com/100321050521367849547/posts
What should be the code. Help please

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Image Analyst
Image Analyst 2013-2-23
编辑：Image Analyst 2013-2-23
You need to use pattern recognition. For example you could use the Hausdorf distance like they did on this web page: http://cgm.cs.mcgill.ca/~godfried/teaching/cg-projects/98/normand/main.html to find the jet. Or try Vision Bib
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Pradeep Sanjeewa
Pradeep Sanjeewa 2013-2-24
编辑：Image Analyst 2013-2-24
http://cgm.cs.mcgill.ca/~godfried/teaching/cg-projects/98/normand/main.html
In the above link, how do they match two images? (planes) What is the software? If it is Matlab, what is the code? Please help me...
Image Analyst
Image Analyst 2013-2-24
编辑：Image Analyst 2013-2-24
I don't know whate software the professor used. You'd have to contact him.
% Demo to use normxcorr2 to find a template (a white onion)
% in a larger image (pile of vegetables)
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
imtool close all; % Close all imtool figures.
clear; % Erase all existing variables.
workspace; % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
% Check that user has the Image Processing Toolbox installed.
hasIPT = license('test', 'image_toolbox');
if ~hasIPT
% User does not have the toolbox installed.
message = sprintf('Sorry, but you do not seem to have the Image Processing Toolbox.\nDo you want to try to continue anyway?');
reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
if strcmpi(reply, 'No')
% User said No, so exit.
return;
end
end
% Read in a standard MATLAB color demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'peppers.png';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
% Didn't find it there. Check the search path for it.
fullFileName = baseFileName; % No path this time.
if ~exist(fullFileName, 'file')
% Still didn't find it. Alert user.
errorMessage = sprintf('Error: %s does not exist.', fullFileName);
uiwait(warndlg(errorMessage));
return;
end
end
rgbImage = imread(fullFileName);
% Get the dimensions of the image. numberOfColorBands should be = 3.
[rows columns numberOfColorBands] = size(rgbImage);
% Display the original color image.
subplot(2, 2, 1);
imshow(rgbImage, []);
axis on;
title('Original Color Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
smallSubImage = imcrop(rgbImage, [192 82 60 52]);
subplot(2, 2, 2);
imshow(smallSubImage, []);
axis on;
title('Template Image to Search For', 'FontSize', fontSize);
% Search the red channel for a match.
correlationOutput = normxcorr2(smallSubImage(:,:,1), rgbImage(:,:,1));
subplot(2, 2, 3);
imshow(correlationOutput, []);
title('Normalized Cross Correlation Output', 'FontSize', fontSize);
[maxCorrValue, maxIndex] = max(abs(correlationOutput(:)));
[ypeak, xpeak] = ind2sub(size(correlationOutput),maxIndex(1));
corr_offset = [(xpeak-size(smallSubImage,2)) (ypeak-size(smallSubImage,1))];
subplot(2, 2, 4);
imshow(rgbImage);
hold on;
rectangle('position',[corr_offset(1) corr_offset(2) 50 50],...
'edgecolor','g','linewidth',2);
title('Template Image Found in Original Image', 'FontSize', fontSize);

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