第四次课，从2.3开讲

2 min paper: Stable Diffusion 3 - Creative AI For Everyone!

1 Intro

What do you notice about this image? How to get it?

Untitled

http://benthomas.net.au/cityshrinker/eilz24txaul9s1hx5prqr0ta5y8nvl

1.1 three views of filtering

  1. Image filters in spatial domain
    1. Filter is a mathematical operation of a grid of numbers
    2. Smoothing, sharpening, measuring texture
  2. Image filters in the frequency domain
    1. Filtering is a way to modify the frequencies of images
    2. Denoising, sampling, image compression
  3. Image pyramids
    1. Scale-space representation allows coarse-to-fine operations
  4. heat diffusion / curvature flow
  5. optimization

refer to Mesh Smoothing

2 Image filters in spatial domain

Online Demo: https://setosa.io/ev/image-kernels/

Image filter: function of local neighborhood at each position: