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A variational approach to degraded document enhancement
Reza Farrahi Moghaddam1, Mohamed Cheriet
1Synchromedia Laboratory for Multimedia Communication in Telepresence, Ecole de Technologie Supérieure, Montréal, QC, Canada. reza.farrahi-moghaddam.1@ens.etsmtl.ca
Summary
This study introduces a variational method to fix document bleed-through. The approach effectively enhances degraded images, even with complex backgrounds and noise.
Area of Science:
- Digital Image Processing
- Computational Mathematics
Background:
- Degraded documents often suffer from bleed-through, obscuring text and requiring advanced restoration techniques.
- Existing methods may struggle with complex backgrounds or noise, limiting their applicability.
Purpose of the Study:
- To develop and validate a variational approach for correcting bleed-through in degraded document images.
- To adapt the model based on the availability of the document's verso side, introducing a flow field model for enhanced restoration.
Main Methods:
- A variational model is employed, adapted using estimated backgrounds from the verso side.
- Advanced models incorporate global control via a flow field for complex cases.
- Solutions are derived using wavelet shrinkage or time-stepping schemes.
- A reverse diffusion process is utilized for double-sided document enhancement.
Main Results:
- Experiments with real and synthesized samples demonstrate promising results in bleed-through correction.
- The proposed model shows robustness against noise and complex backgrounds.
- The method successfully enhances double-sided document images.
Conclusions:
- The developed variational approach offers an effective solution for correcting bleed-through in degraded documents.
- The model's adaptability and robustness make it suitable for various image processing applications beyond document restoration.
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