Digital Watermarking DCT Algorithm

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Resource Overview

This algorithm implements a digital watermarking technique based on Discrete Cosine Transform (DCT), featuring complete watermark embedding and extraction processes. The implementation provides practical code examples for embedding watermarks into host images and recovering them using frequency-domain manipulation, making it suitable for researchers and developers working on image copyright protection systems.

Detailed Documentation

This paper presents a digital watermarking algorithm utilizing Discrete Cosine Transform (DCT) techniques. The implementation comprises two core components: watermark embedding and extraction processes. Through frequency-domain transformation, the algorithm embeds watermark information into middle-frequency DCT coefficients of host images, balancing robustness and imperceptibility. The extraction process reverses this operation by detecting and reconstructing the embedded watermark from DCT coefficients. Key functions include DCT coefficient quantization, embedding strength adjustment, and correlation-based watermark detection. This resource serves as a practical reference for developers implementing copyright protection systems, with hopes to foster knowledge sharing and collaborative improvement in digital watermarking technologies.

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