| 摘要 |
An interactive visual communications system consists of a number of similar terminals linked together by narrow band communications links. Each terminal consists of visual display apparatus having a display and a display generator, an input interactive device for providing input instructions which are converted to graphic task instructions at the terminal, a processor for processing such graphic task instructions (GTI's) to control the display system and the input interactive device. The generated graphic task instructions are directed through an interaction handler which directs the GTI's to the processor as well as to a modem for transmission over the narrow band communications link to one or more similar terminals. In addition, the interaction handler receives GTI's from the other terminals which are also processed by the processor to control the display system. The display system may include a random vector display monitor or a raster graphic display monitor. An x, y raster display system which has an x, y picture memory includes comparator apparatus for identifying predetermined portions of the displayed picture by converting a line count and horizontal position on the picture to an x, y position and by comparing this x, y position to the portions of the picture being written into the x, y memory.
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