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add a note for OpenCV 3.2 configure to ensure we get the recognizer compiled and exposed

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Wu Yang 2017-05-08 17:28:20 +08:00
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@ -227,6 +227,8 @@ contours.convexHull(index, clockwise);
It requires to `train` then `predict`. For acceptable result, the face should be cropped, grayscaled and aligned, I ignore this part so that we may focus on the api usage.
** Please ensure your OpenCV 3.2+ is configured with contrib. MacPorts user may `port install opencv +contrib` **
```javascript
const fs = require('fs');
const path = require('path');