Degraded Historical Document Binarization: A Review on Issues, Challenges, Techniques, and Future Directions.

Area of Science:

• Digital Humanities
• Computer Vision
• Image Processing

Background:

• The digitization of historical documents is crucial for preservation and accessibility.
• Degradation issues like low contrast and artifacts hinder the readability of scanned historical documents.
• Document binarization is a key process for converting grayscale images into binary formats.

Purpose of the Study:

• To provide a comprehensive review of challenges in degraded document binarization.
• To discuss various existing and advanced methods for document image binarization and enhancement.
• To evaluate the effectiveness and robustness of current binarization techniques.

Main Methods:

• Literature review of document binarization techniques.
• Analysis of image enhancement methods for degraded documents.
• Comparative discussion on the effectiveness of different binarization approaches.

Main Results:

• Identified key challenges in binarizing degraded documents, including low contrast and artifacts.
• Reviewed a range of binarization methods, from traditional to advanced.
• Highlighted the role of image enhancement in improving binarization outcomes.
• Assessed the strengths and weaknesses of existing binarization techniques.

Conclusions:

• Current binarization methods face limitations with severely degraded documents.
• Image enhancement plays a vital role in improving binarization accuracy.
• There is a significant scope for developing hybrid approaches for more effective degraded document binarization.