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This paper proposes an improving method for the pixel-wise based image watermarking by using image averaging technique and prediction of tuned watermarked pixels. To reduce the error in the original pixel prediction process caused by the high different values of neighbor pixels in the watermarked image, the technique of image averaging is applied to host image in the embedding process, and the watermarked...
The evolution of telemedicine has lead to the explosive increase in the exchange of medical images among remotely placed medical practitioners. As the medical images serve as valuable evidences for insurance claims and legal trials as well, it is required to ensure that these images are unaltered and they should be identified to be of that of an individual unambiguously. A recent research has shown...
A new color watermarking algorithm of colored images based on modified quaternion fast Fourier transform (QFFT) and discrete cosine transform (DCT) is presented. By modifying the image vector μ, the real part and imaginary part of the carrier image after QFFT are symmetrical. Then, the DCT is applied to the colored watermark, and after multiplying a factor, the RGB components of the watermark are...
In this paper, we consider the digital watermarking based on the modulation of image pixels in YCbCr color space, and propose a method to improve its performance. Basically, we divide the watermark into two parts, and embed each part into each chrominance channel. Based on this concept, in the watermark extraction process, we can reduce the number of the watermarked pixels used in the original pixel...
A digital watermarking for color image based on the modification of image pixels is considered in this paper. Its performance is analyzed and the weaknesses in the watermark embedding and extraction processes are addressed. Based on our analysis, two methods are proposed to improve the watermark embedding and extraction performance. First, the watermark signal is embedded in the chrominance channel...
A digital watermarking for color image based on the modification of image pixels is considered in this paper. Its performance is analyzed and the weakness in the watermark extraction method is addressed. Based on our analysis, a method based on the removal of the luminance bias is then proposed in order to improve the watermark extraction performance. The experimental results obtained verify our proposed...
This paper presents a new method for color image watermarking based on chaos theory. For reasons of simplicity, the watermark is embedded in the spatial domain into the blue channel of RGB color space in order to increase invisibility of the watermarks. Watermark detection is performed without using the original image, by computing the statistical correlation between the watermarked image and the...
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