摘要
本文所指超广角镜头是一种焦距为16 mm或更短的并且视角接近或等于180?的镜头,俗称“鱼眼镜头”。为使镜头达到最大的摄影视角,这种摄影镜头的前镜片直径很短且呈抛物状向镜头前部凸出,与鱼的眼睛颇为相似,“鱼眼镜头”因此而得名。鱼眼镜头的测量范围大,但是由于其变形严重,并没有广泛应用在摄影测量中,如果能有一种针对鱼眼镜头拍摄影像行之有效的纠正方法,则可以在一些测量中应用。目前对数码相机标定理论的研究已经相当成熟,国内外许多摄影测量和计算机视觉专家也提出了各种行之有效的标定方法,然而,针对鱼眼镜头的标定算法和软件仍然不成熟。本文将重点分析比较现有的鱼眼镜头标定模型,并通过编程实现鱼眼镜头的标定算法,最后以立体量测方式说明鱼眼镜头的标定精度。
The ultra-wide-angle lens’focal length is 16 mm or shorter,and the angle of view is close to or equal to 180 degrees,commonly known as“fish-eye lens”.In order to make the lens reach the maximum viewing angle,the front lens of this lens is short in diameter and parabolic,projecting toward the front of the lens,which is similar to the fish’s eye,so“fish-eye lens”is named.Fish-eye lens has a large measurement range,but also large distortion,so it is not widely used in photogrammetry.If there is an effective correction method for the fish-eye lens image,it can be used in some measurements.Nowadays,the study of digital camera calibration is already quite mature,and the photogrammetry and computer vision experts both at home and abroad put forward many kinds of effective calibration method.Although there is a lot of camera calibrations method,to the fish-eye lens it is still immature.In this paper,I will focus on analyzing and comparing the existing fish-eye lens calibration models for fish-eye lens and achieve the calibration algorithm by programming,and finally use the stereoscopic measurement way to illustrate the accuracy of fish-eye lens calibration.
出处
《测绘科学技术》
2019年第3期139-149,共11页
Geomatics Science and Technology
