Screen shooting resilient invisible document image watermarking based on the relation of the DCT coefficients

This paper proposes a novel screen-shooting resilient document watermarking scheme, allowing for the extraction of watermark messages from captured documents displayed on screens. Through careful analysis of distortions encountered during screen-shooting, a specialized watermark embedding and extraction detection algorithm is developed, tailored to document image characteristics. This scheme ensures precise watermark regions detection despite distortions inherent in the screen-shooting process. Additionally, stable Discrete Cosine Transform (DCT) coefficients within the document region are selected, embedded, and extracted, enhancing the robustness of the algorithm. By focusing on the relative stability of DCT coefficients, the algorithm gains resilience against potential distortions and interference, contributing to an improved and more reliable watermarking process.