| http://www.w3.org/ns/prov#value | - Additionally, refining the ROI allows the system to more quickly and accurately locate an object, such as the eyes, within the ROI, since the ROI has been closely tailored to the actual size of the head of the person. [0059] With reference to FIGS. 3 and 5, the detection stage 50 can also define the head ROI when the system first detects motion followed by subsequent frames where no motion is dete
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