"Spot the difference" game code

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abu 2013-4-18

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hi i need a code which 1. detect 2 similar image and crop them out(example from browser) 2. detect the differences between 2 images 3. show the differences, count and label them(example difference no.1,difference no.2)

basically the code is like a cheat to the "spot the differences" game and tell u how many and where are the differences. Appreciate if some1 could help me on the code. Thanks in advance.

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Answer 1

Image Analyst 2013-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/72632-spot-the-difference-game-code#answer_82727

在 MATLAB Online 中打开

Try to just subtract them:

differenceImage = single(image1) - single(image2);
imshow(differenceImage, []);

Then you can threshold and blacken the differences, or make them red, or outline them, or whatever you want to do.

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Image Analyst 2013-4-20

在 MATLAB Online 中打开

You "Answer" below should have been a comment here. Since you didn't upload the pair of images, I can't do much easily other than to direct you what to do. First of all, you need to extract the color planes:

% Extract the individual red, green, and blue color channels.
redChannel1 = rgbImage1(:, :, 1);
greenChannel1 = rgbImage1(:, :, 2);
blueChannel1 = rgbImage1(:, :, 3);
redChannel2 = rgbImage2(:, :, 1);
greenChannel2 = rgbImage2(:, :, 2);
blueChannel2 = rgbImage2(:, :, 3);
% Make difference images for each color channel
redDifferenceImage = single(redChannel1) - single(redChannel2);
greenDifferenceImage = single(greenChannel1) - single(greenChannel2);
blueDifferenceImage = single(blueChannel1) - single(blueChannel2);

Next you need to make a function called FindDifferences(differenceImage). In that function you need to pass the difference image for each color channel in turn. And inside you need to take the absolute value and threshold. Then if you want the "outline" a little larger than the difference region you need to call imdilate. Then pass it back

function detectedDifferences = FindDifferences(differenceImage)
  binaryImage = abs(differenceImage) > 2; % or whatever.
  detectedDifferences = imdilate(binaryImage, true(15));

Now you need to call that for each color channel:

detectedDifferencesR = FindDifferences(redDifferenceImage);
detectedDifferencesG = FindDifferences(greenDifferenceImage);
detectedDifferencesB = FindDifferences(blueDifferenceImage);

Now combine

detectedDifferences = detectedDifferencesR | detectedDifferencesG | detectedDifferencesB;

Now call bwboundaries

boundaries = bwboundaries(detectedDifferences)

Then plot them over the image:

hold on;
numberOfBoundaries = size(boundaries, 1);
for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
  plot(thisBoundary(:,2), thisBoundary(:,1), 'r', 'LineWidth', 3);
end

That's just off the top of my head and untested so there may be some slight errors, but that's the basic process. It's pretty intuitive and obvious, and may be what you had already thought about. Hope that helps.

Image Analyst 2013-4-21

Yes, I saw that, but what I want to know is if my code snippets above helped you. Did you actually try them? Or not? It sounds like not. If not, then why not?

abu 2013-4-22

Yes, that pretty much solved the comparing difference part. My problem noow would be how to crop the 2 image from browser in order to compare them

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Answer 2

abu 2013-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/72632-spot-the-difference-game-code#answer_82890

http://imageshack.us/photo/my-images/14/examplesk.png/ this is the example i need to crop. i need the 2 similar picture. thx a lot.

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"Spot the difference" game code

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