Motion Field


motion is 2D vector on the image
motion field는 3D 장면 움직임을 이미지로 투영한 것
### 3D point
$$X(t)$$
$$V = \partial X / \partial t$$
### 2D Point (Scene Point)
$$x(t)$$
$$v = \partial x / \partial t$$



### parallax
$$x = f\frac{X}{Z} \; y = f\frac{Y}{Z}$$
$$v = \frac{fV - V_zx}{Z}$$




> [옵티컬 플로우 (Optical Flow) 알아보기 (Luckas-Kanade w/ Pyramid, Horn-Schunck, FlowNet 등)](https://gaussian37.github.io/vision-concept-optical_flow/)





