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Hand contour detection in wearable camera video using an adaptive histogram region of interest
José Zariffa1, Milos R Popovic
1Toronto Rehabilitation Institute, University Health Network, 550 University Avenue, #12-102, Toronto M5G 2A2, Ontario, Canada. jose.zariffa@utoronto.ca.
Background:
Monitoring hand function at home is needed to better evaluate the effectiveness of rehabilitation interventions. Our objective is to develop wearable computer vision systems for hand function monitoring. The specific aim of this study is to develop an algorithm that can identify hand contours in video from a wearable camera that records the user's point of view, without the need for markers.
Methods:
The two-step image processing approach for each frame consists of: (1) Detecting a hand in the image, and choosing one seed point that lies within the hand. This step is based on a priori models of skin colour. (2) Identifying the contour of the region containing the seed point. This is accomplished by adaptively determining, for each frame, the region within a colour histogram that corresponds to hand colours, and backprojecting the image using the reduced histogram.
Results:
In four test videos relevant to activities of daily living, the hand detector classification accuracy was 88.3%. The contour detection results were compared to manually traced contours in 97 test frames, and the median F-score was 0.86.
Conclusion:
This algorithm will form the basis for a wearable computer-vision system that can monitor and log the interactions of the hand with its environment.
