Filmrestoratin using extended ACE

Jon Anders Øvern

Introduction

• Restoration of old film

Introduction

• Restoration of old film

• using ACE (Automatic Equilization Algorithm)

Introduction

• Restoration of old film

• using ACE (Automatic Equilization Algorithm)

• Form and implement extension

Introduction

• Restoration of old film

• using ACE (Automatic Equilization Algorithm)

• Form and implement extension

• Experiment and quality analysis

Film restoration

• Old, faded films

• Cannot be restored chemically

• Highly automated digital restoration algortithm wanted

Human Visual System

• Aquisition and interpretation of light

• Eye / vortex

Human Visual System

• Adaption mechanics

• WP

• GW

Color correction algorithms

• Algortihms mimic some properties of the HVS to improve images

• Global

• Retinex, global/local WP algorithm

ACE

• General properties

ACE

• Difference / non-linear function

ACE

• Weighting function

ACE

• Display mapping

ACE

• My contribution:

• Inter-frame considersation

• Non-linear mapping function to avoid edges in the image

ACE in film restoration

• Flickering

• Interframe consideration to reduce flickering

• Non-linear mapping

Experiment

• Setup / material

Experiment

• Results : La Rochelle

Experiment

• Results : Fire and Police

Experiment

• Results : Syntheic

Experiment

• Results : Non-linear mapping

Conclusion

• ACE extension works

Future work

Thanks to :

• Ivar Farup

• Jon Yngve Hardeberg

• Alessandro Rizzi

• Carlo Gatta