numeric¶
This module provides math and linear algebra utils that relies on [Eigen] library. Eigen is a C++ template library for linear algebra.
Basic idea is to provide to openMVG :
- a high level memory container for matrices and vectors,
- an easy matrices and vectors manipulation,
- a collection of numeric solvers and related algorithms.
Vector, Matrix containers¶
OpenMVG redefines some Eigen basis type (points, vectors, matrices) for code consitency and clarity:
Vec2
a single 2d point stored as a column matrix (x,y),Vec3
a single 3d point stored as a column matrix (x,y,z),Vec2f, Vec3f
float version.
Vec
a vector of value (double precision),Vecf
a vector of floating point value,
Mat
the generic matrix container,Mat2X
a collection of 2d points stored by column,Mat3X
a collection of 3d points stored as column.
Note: Default memory alignment is column major.
// Create a set of 2D points store as column
Mat2X A(2, 5);
A << 1, 2, 3, 4, 5,
6, 7, 8, 9, 10;
A.col(); // return a column vector : (1,6)^T
A.row(); // return a row vector : (1,2,3,4,5)
Linear algebra¶
- SVD/QR/LU decomposition.
To know more¶
Please visit: http://eigen.tuxfamily.org/dox/group__QuickRefPage.html