Abstract
This paper presents a digital watermarking algorithm supporting large-size image, the amount of information embedded is based on the characteristics of the host image and the watermarking image. We use pseudo-random encoder to determine the location of embedding information and the watermarking. The method of processing the embedded information and carrier information is discrete cosine transform. The embedding method is determined by the watermark information and the corresponding host pixel value. In the watermark extraction process, the original image and watermarked image are both needed, and the embedded watermark location is determined by the key. The test results show that this algorithm has strong practicality and safety.
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