| The computer system application, the popularization, the network communication and the image compression processing technology as well as the transmission technology fast development, enables the education system to be able to use the newest computer, the correspondence and the imagery processing technology, through the computer network transmission digital image, may provide highly effective for the realization long-distance test supervisory system is feasible, the price inexpensive solution.This article designs the long-distance test supervisory system is uses the school existing campus network environment and the engineering factor, fully displays the campus network the superiority, completes the reliable long-distance video frequency supervisory system, has provided the more powerful technical support for the school each kind of test management.This design is take computer technology as a core, uses present international advanced H.264 multimedia to arrange the decoding compression standard, realized has transmitted the high grade image in the low band width; At the same time used the IP group to broadcast the technology conveniently to realize the multi- spots transmission to correspond with WAN. As well as also in the design used the DirectShow module which Microsoft Corporation provided conveniently to realize the real-time image and the video frequency document broadcast operation; Finally has used the Winsock network programming technology and the Windows multithreading technology causes the network correspondence and the video frequency flows real-time gathering, broadcasts has realized. The entire design realized has flowed the media point-to-point, to the multi- spots, the multi- spots broadcasts to the multi- spots long-distance real-time code group with the monitoring function. |
