热像仪下基于几何约束的空间温度场重建  

Reconstruction of the spatial temperature field based on geometric constraints under a thermal imager

作　　者：倪成玉 张远辉 朱俊江 付铎 Ni Chengyu;Zhang Yuanhui;Zhu Junjiang;Fu Duo(College of Mechanical and Electrical Engineering,China Jiliang University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]中国计量大学机电工程学院,浙江杭州310018

出　　处：《光电工程》2024年第11期59-71,共13页Opto-Electronic Engineering

基　　金：浙江省自然科学基金资助项目(LY19F010007)。

摘　　要：针对二维热图缺乏空间深度信息,而现有建立目标物体空间温度场模型的多传感器方案存在标定复杂、设备成本高和使用条件受限等问题,本研究提出了一种基于几何约束的单一热像仪下的空间温度场重建方案。首先利用热像仪采集得到温度矩阵,通过自动阈值法将其重新映射到灰度颜色空间,得到目标物清晰的边缘信息从而滤除无关背景,再通过热像仪成像过程中存在的几何约束关系和相机成像原理,直接计算目标物在热像仪坐标系中的位姿关系,然后将目标物体的三维模型投影到二维热图平面,得到三维模型的纹理映射参数,随着热像仪对目标物体多视角的数据采集,完成目标物体表面的空间温度场重建。实验结果表明,与多传感器的空间温度场重建方案相比,本文的单一热像仪方案平均误差仅4.3%,可准确稳定地完成目标物的空间温度场重建。In view of the lack of spatial depth information in two-dimensional heat maps and the problems of complex calibration,high equipment cost,and limited use conditions in the existing multi-sensor schemes to establish the spatial temperature field model of the target object,this study proposes a spatial temperature field reconstruction scheme under a single thermal camera based on geometric constraints.Firstly,the temperature matrix collected by the thermal imager is remapped to the gray color space through the automatic threshold method,and the clear edge information of the target is obtained to filter out the irrelevant background.Then,the pose relationship of the target in the coordinate system of the thermal imager is directly calculated by the geometric constraints existing in the imaging process of the thermal imager and the imaging principle of the camera.Then,the 3D model of the target object is projected to the 2D heat map plane,and the texture mapping parameters of the 3D model are obtained.With the multi-view data acquisition of the target object by the thermal camera,the spatial temperature field reconstruction of the target object surface is completed.The experimental results show that,compared with the multi-sensor spatial temperature field reconstruction scheme,the average error of the single thermal imager scheme in this paper is only 4.3%,which can accurately and stably complete the spatial temperature field reconstruction of the target.

关 键 词：温度模型 热像图 视觉几何 三维重建 纹理贴图 温度场 

分 类 号：TB942[一般工业技术—计量学]