Image Homography
[Projective Transformation](https://texonom.com/projective-transformation-fc52410648c345e0a13b8879c6e8756d) [Homogeneous coordinate](https://texonom.com/homogeneous-coordinate-1c52d6e0a29d4c30a298306eddc6bdaf) 


## Projective Matrix
**Scene should planar and very far or has little depth variation (approximately planar)**
두 평면 사이의 변환을 나타내는 행렬
여러 장의 이미지를 스티칭하여 하나의 큰 이미지로 만들 때 사용
Degree of freedom is 8 (3x3 Homography matrix, 1 scale)
so we need at least 4 points (2 equations resulted from below eqation)
$$P' = H \cdot P$$
### Image Homography Notion
|Title|
|:-:|
|[Direct Linear Transform](https://texonom.com/direct-linear-transform-c4580f89679d49f587dd63876097b54a)|








