3 Image Enhancement 3.Intensity transformations spatial filtering Background Some basic intensity transformation Histogram-based image enhancement Fundamentals of spatial filtering Smoothing spatial filters Sharpen spatial filters 第3章第1页3 Image Enhancement 第3章 第1页 3. Intensity transformations & spatial filtering  Background  Some basic intensity transformation  Histogram-based image enhancement  Fundamentals of spatial filtering  Smoothing spatial filters  Sharpen spatial filters