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

王冠宁; 陈涛; 米文忠; 梁晓良; 王汝栋

doi:10.16511/j.cnki.qhdxxb.2021.22.038

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清华大学学报（自然科学版） ›› 2022, Vol. 62 ›› Issue (2) : 277-284. DOI: 10.16511/j.cnki.qhdxxb.2021.22.038

专题：防灾减灾

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

王冠宁^1,2,3, 陈涛¹, 米文忠⁴, 梁晓良⁵, 王汝栋^1,6

作者信息 +

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

WANG Guanning^1,2,3, CHEN Tao¹, MI Wenzhong⁴, LIANG Xiaoliang⁵, WANG Rudong^1,6

Author information +

文章历史 +

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。

Abstract

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.

导出引用

王冠宁, 陈涛, 米文忠, 梁晓良, 王汝栋. 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[J]. 清华大学学报（自然科学版）. 2022, 62(2): 277-284 https://doi.org/10.16511/j.cnki.qhdxxb.2021.22.038

WANG Guanning, CHEN Tao, MI Wenzhong, LIANG Xiaoliang, WANG Rudong. Fire locating method based on the convex hull algorithm using partially blocked surveillance cameras[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(2): 277-284 https://doi.org/10.16511/j.cnki.qhdxxb.2021.22.038

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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）

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收稿日期	出版日期
2021-06-08	2022-02-15
发布日期
2022-01-22

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