高速铁路视频调用时延测试系统的设计与实现

Design and implementation of video call delay testing system for high speed railway

设计了适用于高速铁路联调联试中视频调用时延的测试系统,应用于视频监控系统、安防系统和VOD系统等含有视频播放功能的调用时延.测试系统采用Windows Hook技术、统计直方图算法和数字图像处理技术,实现对视频调用窗口锁定,快速图像抓取、比较时延的准确计算.在联调联试过程中,可以将每一个测点的综合测试时间,由原来的超过120min缩短到15min以内.目前此系统已在20多条高速铁路的综合视频联调联试中应用,验证了系统的可行性和准确性.

A test system is designed to test the time delay of the video call in the high-speed rail- way integrated video test.It can be applied to the detection of video surveillance system, security system, VOD system and other software system. This system uses hook windows technology, statistical histogram algorithm, digital image processing technology to achieve the video call win- dow lock, fast image capture and compare and calculate the accuracy of time delay. In the integra- tion test and commissioning, it can reduce the test time of each check point from more than 120 rains to 15 mins. At present, this system has been applied to the integrated video test for more than 20 high-speed railways, which verifies the feasibility and accuracy of the system.