Design Of Video Coding And Transmission System In Fire Environment

With the development of social economy, the urban scale becomes increasingly larger and the urban buildings become increasingly sophisticated, which remarkably increase the possibility and harm of fire accidents. As a result, the frequent fire accidents pose higher requirements on fire rescue work. Facing heavy smoke, high temperature and darkness as well as other complex environment, fire forces perform in a low efficiency due to the restriction of the poor advancement and applicability of the technical equipment. Therefore, fireman investigation system with high efficiency and reliability is of great importance to enhance rescue efficiency, ensure the life and property safety of firemen and the masses.In fire scene, firemen’s vision is severely restricted due to the heavy smoke and darkness, etc. To respond to this problem, this thesis designs and realizes a video coding and video transportation system being applicable to fire scene. Using infrared image technique to collect the thermal imaging information in fire scene and display the thermal imaging information into the eyepiece of the fireman in real-time manner. Meanwhile, encode thermal imaging information and transfer them into the fire commanding terminal. In order to solve the problem that video wireless transmission is poorly adaptive to the wireless source and channel in the fire scene, this thesis adopts a joint source and channel encoding plan being applicable to the fire scene to realize the real-time monitoring on source and channel condition changes and make reasonable allocation to the code rate of source encoding and channel encoding based on the concrete parameters of source and channel which enhances the flexibility of video encoding and decoding and video transmission system in fire scene. Meanwhile, this thesis adopts the source encoding plan based on multiple hardware encoder redundant encoding and enhances the reliability of video encoding and decoding system to a certain degree.This thesis designs the bottom hardware circuit of the system, which mainly include major control module, power module, sensor module, monitoring module, etc. and makes testing and verification to each module of hardware circuit respectively.This thesis designs and realizes the host computer software system, which adopts MFC (Microsoft Foundation Class) programming. The host computer software system mainly includes user logging model, video broadcasting module, storage management module and database management module, etc. The host computer system mainly accomplishes functions like video decoding, broadcasting and storage and display the fire scene information being collected on the fire commanding platform in real-time manner.Finally, this thesis makes testing and verification to each module of this system. Multiple firehouse branches test and use this equipment in actual combat. The testing and actual using results indicate that this design being applicable to the video encoding and transmission system in fire scene can effectively realize the investigation mission in fire scene. It has a broad application vision.