When reporting issues with this feature, I need to know whether you are able to trigger the gestures in the test dialog that shows the points on your face. If your head is rotated too much in any direction, it's going to stop the gesture from working, because the feature relies on the face being mostly pointed towards the camera (it allows around 14-18 degrees rotation in any axis). It is incredibly complex to take a video frame of a person's face, use facial recognition libraries to capture the contours of the face, then track the contours changing over time to determine if the person is making a particular gesture. Some gestures like "smiling" should be incredibly reliable as I'm using Google's own image recognition code to check the probabiliy that a smile is occurring. If that is not working for you, then something is wrong like your head is rotated too much, or something is interfering with Google's ability to capture the contours of your face (like an environment that is too dark or poor image quality due to a low resolution camera). Some gestures like "left wink", "right wink" or moving the lips left/right are some of the hardest to detect due to the inaccurate nature of Google's facial landmark detection. Regardless, if I place my face around 12-24 inches (30-60 cm) in front of my tablet my face centered and pointing towards the camera, I can trigger all of the gestures accurately with no errors.
One thing I want to mention is that there is a "Gesture Duration" setting. That determines how long you have to hold the gesture for it to be recognized. If you drop that to 0.1 seconds, then the library will fire the gesture far more quickly, but it may also be more likely to trigger false positives.
Mike
One thing I want to mention is that there is a "Gesture Duration" setting. That determines how long you have to hold the gesture for it to be recognized. If you drop that to 0.1 seconds, then the library will fire the gesture far more quickly, but it may also be more likely to trigger false positives.
Mike