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Added a kalman filter to stablize subtle movement.
Tested and worked great on webcam mode.
A great 7-min video to explain kalman filter and how it helps object-tracking: https://www.mathworks.com/videos/introduction-to-kalman-filters-for-object-tracking-79674.html
Caveat: The noise matrix q and r is simplified as scalar value. If we need better accuracy, it may worth to explore its vector form to incorporate time / velocity information in the noise matrix, or import existing implementation from Accord.NET framework.