基于三线靶标的航空相机地面分辨率质量评价

Quality Evaluation of Ground Resolution of Aerial Camera Based on Three Line Target

检测航空相机对地面图像质量是对其性能检测的一项重要指标。航空相机是否达到设计指标要求要通过实际航拍验证,但是航空相机航拍检测的地面目标不是实际的地面目标而是人为设定的一种目标。目前这种目标在国内还没有相应的技术标准和质量评价体系,三线靶标成像的分辨率检测是目前国内广泛使用的航空相机对地面图像质量评价比较直观、易读和定量的判别方法。简述了地面分辨率的不同表达方式及三线靶标的构成,分析了三线靶标地面分辨率与航高、焦距的关系。根据三线靶标分辨率判别方法特点,结合实际应用,实际设计了一个三线靶标用于航拍试验,航拍结果满足设计的航空相机地面分辨率航拍技术指标性能要求。

Detecting the ground image quality of aerial cameras is an important characteristic for their performance testing.Whether the aerial camera ultimately meets the design requirements needs to be verified through actual aerial photography,the ground target detected by aerial photography is not an actual ground target,but a manually setting target.At present,there is no corresponding technical standard and quality evaluation system for this type of target in China.Resolution detection of three line target imaging is a commonly used,intuitive,easy to read and quantitative discrimination method for evaluating ground image quality using aerial cameras in China.The different expressions of ground resolution and the composition of three line targets are briefly described.The relationship between ground resolution of three line targets and altitude,focal length are analyzed.According to the characteristics of three line target resolution discrimination methods,and incorporated with practical applications,a three line target for aerial photography experiments is designed.And the aerial photography results meet the performance requirements of the designed aerial camera ground resolution aerial photography technical characteristics.