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Face detection algorithm for 15x15 pixels?

I would like to know if you know about any low-resolution face detection algorithm in an image. The image can have any resolution, and the resolution of persons can be either 10x10 or 15x15. I use OpenCV, but I don’t think that Haar classifiers allow me to work with such small resolutions. Is there any other alternative? Thanks

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Eigenface's technology is (IIRC), which works well in low-resolution images. Human faces have a clear structure for them, which are still visible with low quality, and I believe that using the sliding window method in combination with this algorithm can give good results.

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