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A video scaling apparatus and technique for compressing and reconstructing video data sent between multimedia workstations during a video teleconference includes a video data scaling device which scale unscaled video data, having V horizontal lines of H pixels each, to reduce the quantity of horizon

A video scaling apparatus and technique for compressing and reconstructing video data sent between multimedia workstations during a video teleconference includes a video data scaling device which scale unscaled video data, having V horizontal lines of H pixels each, to reduce the quantity of horizontal lines and the quantity of pixels along each line. A pixel replication device replicate the received scaled pixels to increase the quantity of horizontal lines to V and the quantity of pixels along each of the horizontal lines to H. The scaling device reduces the quantity of horizontal lines to about V/2, and the quantity of pixels along each horizontal line to about H/2. A received pixel is replicated to replace an adjacent pixel along a line to reconstruct the line. The reconstructed line is replicated to replace an adjacent line. The replicated line is shifted by one pixel relative to the adjacent line from which it was replicated to reduce sharp edges and blockiness.

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[ We claim:] [1.] Video teleconferencing apparatus for a distributed data processing system having a plurality of computer workstations connected by a digital data network, the computer workstations comprising:a) source means for a local workstation to send scaled video data across the digital data

[ We claim:] [1.] Video teleconferencing apparatus for a distributed data processing system having a plurality of computer workstations connected by a digital data network, the computer workstations comprising:a) source means for a local workstation to send scaled video data across the digital data network to a remote workstation, the source means comprising video data scaling means for scaling frames of unscaled video data to reduce the quantity of horizontal lines and the quantity of pixels along each of the horizontal lines in the frames;b) packeting means for dividing the scaled video data of each of the frames among plural packets for transmission across the digital data network, the packets containing header information indicating a height and width of the frames contained in the packets and timing information indicating when the frames should be displayed; andc) receiver means for the local workstation to receive the packets and extract the frames of scaled video data from across the digital data network sent from source means of the remote workstation.