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A place to jot down the picked up.

Calibration

Homography

单应性变换，两个平面之间的映射。

Rigid Body Transformation

刚体：在三维空间中保持形状和体积不变的物体，可以进行平移和旋转。

刚体变换：描述刚体在三维空间中的位置和姿态变化，包括旋转和平移。从一个坐标系到另一个坐标系的映射关系。

标定与配准基础概念与流程

基础概念

  1. 相机内参矩阵（Camera Intrinsic Matrix, MiM_i）

    • 用于将三维相机坐标 P(x,y,z)P(x, y, z) 转换为二维像素坐标 P(u,v)P(u, v)。
    • 公式：

      [uv1]=Mi⋅[xyz]\begin{bmatrix} u \\ v \\ 1 \end{bmatrix} = M_i \cdot \begin{bmatrix} x \\ y \\ z \end{bmatrix}

  2. 相机外参矩阵（Camera Extrinsic Matrix, MeM_e）

    • 用于将三维世界坐标 P(X,Y,Z)P(X, Y, Z) 转换为相机坐标 P(x,y,z)P(x, y, z)。
    • 公式：

      [xyz]=Me⋅[XYZ]\begin{bmatrix} x \\ y \\ z \end{bmatrix} = M_e \cdot \begin{bmatrix} X \\ Y \\ Z \end{bmatrix}

  3. 反向坐标映射

    • 可以通过求逆矩阵，将像素坐标还原为相机坐标，或将相机坐标还原为世界坐标。
Dale8/11/25
Docker
  • create a container from an image: docker run -it --name <container_name> <image_name>
  • list all containers: docker ps -a
  • start a container: docker start <container_name>
Dale7/30/25
Linux
  • Check Linux kernel version: uname -r
  • Check full system info: uname -a
  • Check distribution info: cat /etc/os-release
  • Check CPU info: cat /proc/cpuinfo
  • Check memory info: cat /proc/meminfo
  • Check disk usage: df -h
  • Check current user: whoami
Dale7/30/25
Anaconda

  • Open Anaconda Prompt

  • Run where conda to find the path of conda

  • Then add those paths to the environment variable PATH:

    • ...\anaconda3
    • ...\anaconda3\Scripts
    • ...\anaconda3\Library\bin

  • List conda installed packages and pip packages

    • Both: conda list
    • Conda: conda list --explicit
    • Pip: pip list

  • Remove a conda environment: conda env remove -n <env_name>

Dale7/22/25
Learning-based Axial Video Motion Magnification

What is the idea?

It is a subsequent work of the 2018 learning-based video motion magnification method. They use the same dataset. They generate the videos by manually overlapping two objects in the video and controlling the motion of different objects. Smaller implies raw video, larger implies magnified video. The goal is to learn the motion of the objects and magnify it. They focus on "motion/edge/phase", not "color/surface".

Dale7/22/25Image ProcessingMotion Magnification
Android Studio
  • Get some file: adb pull src dest
  • List an emulator downloaded from the Android SDK: & "C:\Users\LMAPA\AppData\Local\Android\Sdk\emulator\emulator.exe" -list-avds
  • Open one: & "C:\Users\LMAPA\AppData\Local\Android\Sdk\emulator\emulator.exe" -avd Pixel_8_Pro_API_35
  • List emulator: adb devices
Dale7/18/25
A place to jot down the picked up.
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