Dynamic Range Compression

1
Dynamic Range Compression
How to display HDR image on 8 bit monitor?
Too bright

• Multiscale methods
• gave halos.

Too dark

• We cured the halos.

Secret ingredients Wavelet transforms and
smooth gain maps.
Yuanzhen Li, Lavanya Sharan, Edward Adelson BCS
and CSAIL, MIT
2
Companding (compress and expand)

• Compress HDR to LDR and expand to HDR

Compress
LDR, stored as JPEG
HDR, original
HDR, retrieved
Expand
Yuanzhen Li, Lavanya Sharan, Edward Adelson BCS
and CSAIL, MIT