| 摘要 |
In a sequence of video fields having a foreground component and a background component, an apparatus for tracking a pointing device in use by a foreground subject which device is the leftmost or rightmost object within the foreground component is described. The apparatus includes means for determining the boundaries of a cropped video field within each of the video fields, means for determining for each cropped video field a pixel value and scan line representing the leftmost position of the foreground subject and pointing device for that cropped video field and a pixel value and scan line representing the rightmost position of the foreground subject and pointing device for that cropped video field, means for determining the centerline of the foreground subject for each cropped video field, means using the centerline for determining whether the pointing device is on the right side of the cropped video field or the left side of the cropped video field, and means for storing the position of the pointing device after receipt of a signal generated by the foreground subject. |
