Cannot find FREAK detector in OpenCV

I am developing some code in OpenCV 2.4 and I want to test the FREAK detector, but I get compilation errors. I turn on feature2d.h, what can I do to fix this?

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FREAK is included in OpenCV version 2.4.2, so you cannot use it in your current version because it is not implemented. Download and install OpenCV2.4.2.

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Source: https://habr.com/ru/post/1433336/


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