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A novel scheme combining Sobel technology with genetic algorithm is proposed in this paper to protect image copyright. For the Sobel-based copyright protection schemes in the literatures, they use Sobel technology to detect the edge of the cover image, i.e. the copyright image. By using the kernels to calculate the edge directions of the cover image, the gradients of the cover image pixels can be...
Data authentication is one of the primary requisites in present day communication systems. In image processing, data authentication is implemented by using watermarking techniques. Nevertheless, whatever be the technique of watermarking, one of the important factors to be considered is robustness. In this paper we discuss about a novel robust method for digital watermarking in spatial domain. The...
In this paper, we present a robust and secure blind digital image watermarking algorithm. The algorithm is based on changing the intermediate significant bit (ISB) of the low-frequency approximation subband (LL) of the DWT domain to embed watermark into host image. Experimental results demonstrate the robustness against several common image-processing operations.
Day to day growth of multimedia technology draws great attention for security. Digital images can be easily altered with software. This problems demand copyright protection and ownership verification. Digital watermarking is proposed as one of the ways to accomplish this, in which Digital watermarks are generally embedded into digital images in a manner that make the watermark invisible to a human...
This paper presents a robust video watermarking scheme. It mainly contains three characteristics: 1) the sinusoidal signals pattern is embedded as watermark in the selected sub-bands of 3D dual-tree complex wavelet transform (3D-CWT), which is employed to preserve the image quality and improve the robustness of watermark; 2) at the detection end, the detected peaks response are used to achieve attacks...
In this paper, a local watermarking scheme in the ridgelet domain combining image content and JND model is presented. Since the ridgelet transform (RT) can efficiently represent image with linear singularities and has directional sensitivity, the image is partitioned into small pieces. And these small pieces are classified into different characteristic categories (S1 with weak texture, S2 with strong...
In this paper, a simple and robust watermarking scheme is presented by using random mapping function. The idea of the proposed algorithm is watermark embedding which can be more robust than the traditional LSB technique. Using the proposed algorithm, it makes the secure random coordinate of cover image to increase the robustness of the watermarked image. Experimental results show that the quality...
For many applications such as medical images or military images which requires accurate images, the images are watermarked by a robust watermarking technique in order to prove their originality and authority, but these imagespsila receivers should have strong request to recover the original images for the further uses. The watermarking technique based on random sequence is one of the well-known robust...
An image watermarking procedure in the space/spatial-frequency domain is proposed. Space/spatial-frequency regions to be watermarked are selected by using the two-dimensional spectrogram. In order to provide both the imperceptibility and robustness of the procedure, a watermark is modeled according to the specific characteristics of pixelspsila regions. The inversion from the space/spatial-frequency...
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