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分析地铁隧道沉降变形自动监测系统现场调试需求,根据系统结构及工作原理,设计了一种基于嵌入式Linux平台、B/S模式的调试方案,用于设置系统初始化参数和调节图像传感器。该方案在linux平台上构建嵌入式web服务器Apache httpd,按照V4L2规范采集监测摄像头的图像并压缩,经httpd推送至浏览器不断刷新显示,形成视频效果。用户通过网页设置系统初始化参数、观察摄像头视频,以调节摄像头的安装角度、光圈及曝光度等,获得监测目标的理想拍摄位置和图像输出,完成系统现场安装调试。
Based on the system structure and working principle, a debugging scheme based on embedded Linux platform and B / S mode was designed to set the initial parameters of the system and adjust the image sensor. The program builds Apache httpd, an embedded web server on Linux platform, collects the images of surveillance camera according to the V4L2 standard, and pushes it to the browser through httpd to display the video effect. Users through the web page to set the system initialization parameters, observe the camera video to adjust the camera installation angle, aperture and exposure, etc., to obtain the ideal target location and image capture output to complete the site installation and commissioning of the system.