A generic camera model and calibration method for conventional, wide-angle, and fish-eye lenses

第一章:引言介绍

Focus:

accurate geometric modeling of real cameras

method:

1.it requires that the camera observes a planar calibration pattern.
2.it's based on a generic camera model that will be shown to be suitable for different kind of omnidirectional(全方位的) cameras as well as for conventional cameras.

第二章:引入一种相机模型

A.radially symmetric projection model(径向对称投影模型)

principal point (主点)
focal length(焦距)

r是主点与图像中二维点之间的距离,f是焦距,θ是主轴(光轴)与入射光之间的夹角

perspective projection (透视投影):r = ftanθ
stereographic projection (立体投影):r = 2
tan(θ/2)
equidistance projection (等距投影):r = fθ
equisolid angle projection (等立体角投影): r = 2f
sin(θ/2)
orthogonal projection(正交投影): r = f*sin(θ)

多项式投影:

polynomial projection

B.Full Model

distortion term (畸变系数)

径向方向的系数:

radial direction

切向方向的系数:

tangential direction

畸变坐标:

![distorted coordinates](http://upload-images.jianshu.io/upload_images/569253-f643926340733484.png?
imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

ur(ϕ)是颈向方向的单位向量
uϕ(ϕ)是切向方向的单位向量

pixel coordinates

(u0,v0)T 是主点
Mu,Mv是水平方向和垂直方向上单位距离的像素点个数

forward camera model

第三章:通过将它与其他的模型进行对比进行优化修正

第四章:介绍估计相机参数的流程

标定算法流程:

假设有N个视角下的M个控制点。每个视角下,存在着一个旋转矩阵Rj和一个平移向量tj,描述了相机相对于标定平面的位置

第五、六章:讨论实验结果

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