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Try FaceDetector in the Android SDK. It returns face positions and angles in BMPs. But it’s not very fast.
Here’s a realtime face detection sample using FaceDetector and OpenGL (draws rectangles) which works in Android 2.2.
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You’d better try this on Linux (I’ve tried it on Windows, but failed).
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JavaCV (strongly recommended)
There is a sample code of realtime face detection using the camera. See “javacv-src-*.zip” on the download page.