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Checking images for similarity with OpenCV

Does OpenCV support the comparison of two images, returning some value (maybe a percentage) that indicates how similar these images are? E.g. 100% would be returned if the same image was passed twice, 0% would be returned if the images were totally different. ...
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Can I 'git commit' a file and ignore its content changes?

Every developer on my team has their own local configuration. That configuration information is stored in a file called devtargets.rb which is used in our rake build tasks. I don't want developers to clobber each other's devtargets file, though. ...
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Local variables in nested functions

Okay, bear with me on this, I know it's going to look horribly convoluted, but please help me understand what's happening. ...
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How can I open multiple files using “with open” in Python?

I want to change a couple of files at one time, iff I can write to all of them. I'm wondering if I somehow can combine the multiple open calls with the with statement: ...
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CSS content property: is it possible to insert HTML instead of Text?

Just wondering if it's possible somehow to make the CSS content property insert html code instead string on :before or :after an element like: ...
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.NET NewtonSoft JSON deserialize map to a different property name

I have following JSON string which is received from an external party. 5 Answers 5 ...
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What's the difference between using CGFloat and float?

...o use CGFloat all over the place, but I wonder if I get a senseless "performance hit" with this. CGFloat seems to be something "heavier" than float, right? At which points should I use CGFloat, and what makes really the difference? ...
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What does the 'standalone' directive mean in XML?

What does the ' standalone ' directive mean in an XML document? 5 Answers 5 ...
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When should Flask.g be used?

I saw that g will move from the request context to the app context in Flask 0.10, which made me confused about the intended use of g . ...
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What is NODE_ENV and how to use it in Express?

This is my the app, I'm currently running on production. 4 Answers 4 ...