Embedding robust labels into images for copyright protection
KnowRight '95 Proceedings of the conference on Intellectual property rights and new technologies
Digital watermarking
Watermarking Document Images with Bounding Box Expansion
Proceedings of the First International Workshop on Information Hiding
A Feature Calibration Method For Watermarking Of Document Images
ICDAR '99 Proceedings of the Fifth International Conference on Document Analysis and Recognition
Data hiding in binary image for authentication and annotation
IEEE Transactions on Multimedia
Performance comparison of two text marking methods
IEEE Journal on Selected Areas in Communications
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In this paper, we propose a high capacity data hiding method in binary document images towards semi-fragile authentication. Achieving high capacity in binary images with strict imperceptibility criterion is found to be a difficult task. In this method, noise type pixels are selected for pixel-wise data embedding using a secret key. The data hiding process through pixel flipping introduces some background noise in watermarked images and could preserve relevant information. The reversible nature of noise pixel patterns used in flipping process enables blind detection and provides high watermark capacity illustrated in different test images. After extraction process, the background noise is removed to generate the noise-free version of the watermarked image.