hom_mat2d_identity( : : : HomMat2DIdentity)

hom_mat2d_identity (Operator)

Name

hom_mat2d_identity — Generate the homogeneous transformation matrix of the identical 2D transformation.

【1】定义二维齐次变换矩阵，定义完后变换矩阵是单位阵（鸟叔）

【2】定义一个二维变换矩阵，然后把它变成其次的变换矩阵

 homogeneous transformation matrix 齐次转换矩阵

identical 同质的

                                                      /   1  0  0    \

  HomMat2DIdentity = | 0 1 0 |

                     \ 0 0 1 /

 

Signature

hom_mat2d_identity( : : : HomMat2DIdentity)

Description

hom_mat2d_identity generates the homogeneous transformation matrix HomMat2DIdentity describing the identical 2D transformation:

                     / 1 0 0 \

  HomMat2DIdentity = | 0 1 0 |

                     \ 0 0 1 /

Attention

【1】Note that homogeneous matrices are stored row-by-row as a tuple;

【2】the last row is not stored because it is identical （相同而）for all homogeneous matrices that describe an affine transformation. Thus, HomMat2DIdentity is stored as the tuple [1,0,0,0,1,0].

 identity同质的，相同的

 

【1】仿射变换可以理解为：对坐标进行缩放、平移、旋转，最后取得新坐标的值

【2】定义一个二维变换矩阵，然后把它变成其次的变换矩阵

【3】hom_mat2d_identity (Operator)  ，这一系列算子。

           hom_mat2d_是指二维齐次矩阵。是从原来非齐次转化的，他们是同质的