How to Configure CIF in a Video Conferencing System

摘要

The present invention relates to a CIF configuration method of a videoconferencing system, wherein a video signal from a main camera and a document video signal from a document camera are captured in a 352 * 240 format image and configured as a 352 * 288 format CIF image. Then, in the video conference system for compression encoding transmission, if the captured image is a document video signal, the front and rear 24 lines are blanked and a 352 * 240 image is inserted therebetween to form a CIF frame, and If the image is a video signal for video, it consists of inserting one line every fifth line in a conventional manner to form a CIF frame.;Therefore, in contrast to the conventional video signal and document video signal, one line is inserted every 5th line to form a CIF frame, and the document video signal is broken and transmitted. By constructing a CIF image selectively with respect to the video signal, it is possible to prevent the image of the document from being broken and to transmit a clearer image.