基于凸壳理论的监控摄像头部分遮挡场景下火焰定位方法  

Fire locating method based on the convex hull algorithm using partially blocked surveillance cameras

作　　者：王冠宁 陈涛 米文忠 梁晓良 王汝栋 WANG Guanning;CHEN Tao;MI Wenzhong;LIANG Xiaoliang;WANG Rudong(Institute of Public Safety Research,Department of Engineering Physics,Tsinghua University,Beijing 100084.China;Gansu Fire and Rescue Department,Lanzhou 730000,China;Anhui Province Key Laboratory of Human Safety,Hefei 230601,China;Hefei Institute for Public Safety Research.Tsinghua University,Hefei 230601,China;Beijing Fire and Rescue Department,Beijing 100035,China;Unit 96963,PLA,Beijing 100192,China)

机构地区：[1]清华大学工程物理系,公共安全研究院,北京100084 [2]甘肃省消防救援总队,兰州730000 [3]灾害环境人员安全安徽省重点实验室,合肥230601 [4]清华大学合肥公共安全研究院,合肥230601 [5]北京市消防救援总队,北京100035 [6]中国人民解放军96963部队,北京100192

出　　处：《清华大学学报（自然科学版）》2022年第2期277-284,共8页Journal of Tsinghua University(Science and Technology)

基　　金：国家重点研发计划(2019YFC080026);国家自然科学基金资助项目(71673163,71971126);应急管理部消防救援局科研计划重点攻关项目(2019XFGG20)。

摘　　要：利用视频分析技术开展火焰定位对火灾事故调查意义重大。为解决实际火灾中监控摄像头部分遮挡场景下起火部位难以确定的问题,该文基于凸壳理论研究了此场景下火焰定位方法。利用油盘火模拟室内火灾现场,布置彩色电荷耦合器件(CCD)摄像头使之被部分遮挡,收集火灾现场监控视频进行分析。首先利用火灾现场监控摄像头收集火焰视频并进行预处理;其次利用凸壳算法计算火焰中心的像素坐标;最后基于单目视觉原理,利用世界坐标系和成像平面坐标系的矩阵变换关系,定量计算出起火部位与监控摄像头的相对位置。实验结果表明:针对监控摄像头部分遮挡场景建立的基于凸壳理论和单目视觉原理的火焰定位方法,可以较好地实现起火部位的快速定位,为火灾事故调查工作的顺利开展提供了有力的工具。Video analyses have become very useful in fire investigations.However,the cause of the fire cannot be easily determined when the surveillance cameras are partially blocked.This study analyzes fire locating methods based on the convex hull algorithm when the surveillance cameras are partially blocked.An oil pan pool fire is used to simulate an indoor fire.The charge-couple device(CCD)camera views are partially blocked with the fire scene videos then collected for analyses.The flame videos are collected and preprocessed before analyzing.Then,a convex hull algorithm is used to calculate the pixel coordinates of the flame center.Finally,the monocular vision principle is used to develop a matrix transformation between the world coordinate system and the imaging plane coordinate system to accurately determine the fire location.Tests show that the monocular visual positioning method based on the convex hull algorithm using partially blocked cameras can accurately locate the fire origin as a powerful tool for fire investigations.

关 键 词：凸壳 视频分析 单目视觉 火灾调查 火焰定位 

分 类 号：X932[环境科学与工程—安全科学]