🌅 Image filtering

=== applying a filter $H$ to an image $f$: $H(f(x,y))=r(x,y)$==

⚙️ System Theory

• filter: system
• image: signal → convolution can also be performed

Types

Linear filters

• 🏙️ Image derivative: Derivative filters
  • e.g. ${\delta }_x\to$[-1, 0, 1]
• gaussian filter
  • → smoothing

Non-linear filter

• 🎯 Median filter
• 🔪 Segmentation filters (image filtering)