Week 2 Face Detection with Haar Classifier, Next Step Pose Estimation

At the end of week one, following a tutorial on how to write a Haar Classifier for Face detection, I am able to now track a face, and using multi-threading am able to present a program (for now, the display of the webcam feed) on a separate layer from the detection calculation.

Added in a frame capture to document what I have so far.
Some images of the face detection capture:

(Good)

Unexpectedly, the image also has the previous rectangle in the scene. Not sure why exactly, however, perhaps this could lead to work in motion estimation.
Some Examples:
(First Image of Sequence)


(Second Image of Sequence, lingering rectangle in image)


(Third Image of Sequence, only one lingering rectangle in image)



My next steps will be to do pose estimation, perhaps beginning on static images.
Currently I am studying the following documentation of previous work on pose estimation to get a better idea of what I need to implement:
Real-Time Face Pose Estimation in Video Sequence, Xiaoping Chen, Qianqian Yang, Honghong Liao, Weiping Sun, Shengsheng Yu, College of Computer Science and Technology, Huazhong University of Science and Technology

and

Head Tracking and Gesture Recognition Library, Louis-Philippe Morency

- Alfred