Design And Performance Analysis Of Embedded Web Server For IP Camera

An efficient, stable and safe embedded web server (EWS) makes embedded equipment universal, opening, manipulative function integrity, data processing convenience, human-machine interface friendly, debugging and maintenance simple. EWS is applied in the field of video monitoring. It represents the trend of networking development of digital video monitoring system.By researching the system architecture, working process, critical technologies of the EWS and analyzing the application environment of video monitoring systems, EWS was devided into four main modules in the design based on MCF5249 and uClinux: embedded HTTP engine, security module, configuration module and application interface. Embedded HTTP engine used single-process and non-blocking sockets to process connections simultaneously. Security module used simple identity authentication and access control. Configuration module used special file to store parameters of configuration and special process to deal with requests of parameters updating. Common gateway interface (CGI) was selected as application interface and used pipe and environment variable to transfer data between the parent process and child processes which executing CGI programming.According the performance analysis model improved based on Louis opening network model and the performance test made with WebBench5.0, EWS performance of IP Camera is affected by hardware and operation system of IP Camera, network environment, network protocol, technologies implemented by EWS (security mechanism, percent of dynamic content, etc), system load (frequency of file requesting, amount of users which accessing simultaneously, etc).Performance optimizing of EWS according to the performance analysis makes EWS of IP Camera more efficient, stable and safe. It will promote the popularization and development of video monitoring equipment.