university computervision week1 theory
Histogram Equalization
Source:
Goal
Create a new image whose intensities are spread more evenly across the available range.
Core mapping
The lecture uses the normalized cumulative histogram as a lookup table:
Then each input value u is replaced by \phi(u).
Key idea
- compute histogram
- compute cumulative histogram
- normalize it
- use it as a lookup table for output intensities
This preserves intensity ordering while improving contrast.