OpenCV Camera Note(I) Calibrate

Q1: Why need to calibrate?

Because photo will be distorted after camera shot, the reason is light refract

Q2: What kinds of distortion exist?

Two major kinds of distortion are RADIAL DISTORTION(径向畸变) and TANGENTIAL DISTORTION(切向畸变).

Q3: Which distortion will effect image

  1. Radial distortion causes straight lines to appear curved.
  2. Tangential distortion causes “some areas in the image may look nearer than expected.”

Q4: What caused distortion?

The actual reason is pinhole cameras theory design, the physical reason is light refraction

  1. radial distortion occurs because light has different lengths to pinhole via different refraction
  2. tangential distortion occurs because the image-taking lens is not aligned perfectly parallel to the imaging plane.

Q5: What is needed for correct distortion?

Need intrinsic and extrinsic parameters

  • Intrinsic parameters are specific to a camera.
  • Extrinsic parameters correspond to rotation and translation vectors

which translates a coordinates of a 3D point to a coordinate system.

Q6: Intrinsic parameters contain?

They include information like focal length (fx,fy) and optical centers (cx,cy).

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    缺失模块。
    1、请确保node版本大于6.2
    2、在博客根目录（注意不是yilia根目录）执行以下命令：
    npm i hexo-generator-json-content --save

    3、在根目录_config.yml里添加配置： 

      jsonContent:
    meta: false
    pages: false
    posts:
      title: true
      date: true
      path: true
      text: false
      raw: false
      content: false
      slug: false
      updated: false
      comments: false
      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true

我写的，大概率是错的。。。。。