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    <p>I believe the culprit is you're looking for a single resolution of template, which is much smaller than the flowers you want to find.</p> <p>So, if you're using matchTemplate - you should run it several times. For different sizes of the template (make your flower bigger with resize). Another option is to scale the image down, and use the template of the same size.</p> <p>Those approaches are rather simple, however, may be sub-optimal - you'll be doing a lot of work resizing and matching all over again. So, you should probably use feature matching and figure out what exactly goes wrong. Don't know if you've seen it, but you can follow the feature matching tutorial <a href="http://docs.opencv.org/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.html" rel="nofollow">http://docs.opencv.org/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.html</a></p> <p><strong>UPD</strong></p> <p>I believe, I misinterpreted your image. I agree with you on the size now - it isn't such a big deal. Well, I don't know how you've done the matching, but the following code</p> <pre><code>Mat image = imread("/home/sergei/Documents/source.jpg"); Mat templ = imread("/home/sergei/Documents/template.jpg"); Mat dst; matchTemplate(image, templ, dst, CV_TM_CCOEFF_NORMED); threshold(dst, dst, 0.2, 0.0, THRESH_TOZERO); for (int i = 0; i &lt; dst.rows; i++) { for (int j = 0; j &lt; dst.cols; j++) { if (dst.ptr&lt;float&gt;(i)[j] &gt; 0.0) { imshow("candidate", image(Rect(j, i, templ.cols, templ.rows))); waitKey(0); } } } </code></pre> <p>misses, I believe, 2 of the matches you consider valid. It gives you few false positives as well, but that's a start.</p> <p>You can improve further by playing with threshold value and matching metric.</p>
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    1. POFind similar patterns in paintings? OpenCV
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    1. USSergei Nosov
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    1. COThe template is cut/cropped from the same image. So I don't think resolution is the problem. Though the flowers not getting matched are a little big (but only a little - does that make much of a difference)- I suppose that the problem is the no. of petals in other flowers are a few more and the colour is also a bit distorted. P.S. I have tried the link that you posted. It only finds the exact match not other similar ones.
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      1. USRuppesh Nalwaya
    2. COyour way of writing for loop is strange to me -
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    3. COOh, my. The formatting screwed everything up. Fixed now =)
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