| 摘要 |
A videoconferencing system which is easy to use. A camera unit (17) provides a picture which is displayed on the display screen of a monitor (21A, 21B). A controller (10) controls the operation of the camera and also causes a pointer or other indicator to be displayed on the display screen along with the picture. A user input device, such as a mouse (12) or a joystick (18), is connected to the controller. The mouse or joystick is used to position the pointer at a desired location on the picture and to draw a rectangular area of interest on the display screen, for example by depressing a mouse button when the pointer is at a first location, dragging the mouse to a second location, and then releasing the button. Upon an indication from the user that a desired area of interest has been drawn, for example by a click of the mouse button, the camera pans and/or tilts in order to center the desired area of interest on the display screen and zooms in order to fill the display screen with the desired area of interest. Because the shape of the rectangular area of interest drawn by the user may not correspond to the shape of the display screen, one dimension, such as the larger dimension or the smaller dimension, of the rectangular area of interest is selected to fill the display screen. To avoid the annoying effect of very small camera adjustments, the camera pan and/or tilt is not adjusted unless the amount of adjustment exceeds a predetermined value. To avoid the annoying effect of a rapidly changing field of view, the camera is zoomed out prior to panning and/or tilting, and then zoomed in after panning and/or tilting, if the amount of camera panning and/or tilting exceeds a predetermined value. |
