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In this paper, a new watermark retrieval method is proposed to be used in the digital watermarking based on the modification of image pixels in order to improve the accuracy of the retrieval watermark and simultaneously enhance the robustness of the embedded watermark. Conceptually, different color spaces usually display different discriminating energy. The watermark embedded in blue component of...
This paper presents a video watermarking technique able to resist geometric attacks. The proposed method performs imperceptible watermarking of video in the spatio-temporal domain. Before embedding or detecting the watermark in the video, the location of the most appropriate triangles used for positioning the watermark must be found. For this reason, the interest points in each frame are first found...
This paper proposes a novel image denoising algorithm in spatial domain for filtering mixture of speckle and impulse noise using combination of local statistics and non-linear Robust Estimator. Proper choice of despeckling filter is an important requirement for contrast enhancement. On the other hand suppression of impulse noise aids the enhancement and preservation of edges. The proposed algorithm...
Digital watermarking is an effective and popular technique for discouraging illegal copying and distribution of copyrighted digital image information, which in turn provides an alternative solution for image authentication. This paper proposes an innovative watermarking scheme in which some pixels are randomly selected from original image, so that all of them have a valid 3 × 3 neighborhoods. A binary...
In this paper, a simple and robust watermarking algorithm is presented by using the third and the fourth least significant bits (LSB) technique. The proposed algorithm is more robust than the traditional LSB technique in hiding the data inside the image. Using the proposed algorithm, we will embed two bits in the third and fourth LSB. Experimental results show that the quality of the watermarked image...
This paper proposes a reversible visible watermarking method which are contour style. According to the fact that it has informational redundancy in a nature images usually, it is possible to embed watermarking image in the corresponding area of original image. Based on the cryptography method, users can view the original image after remove the visible watermarking by the proposed method. The proposed...
This study presented a new algorithm for hiding information in an carrier image. It hides information by using the numerical value relation of three neighboring DCT coefficients with Zig-Zag order of block image. Firstly, each block of image is transformed by DCT. Then the DCT coefficient matrix is scanned by Zig-Zag scanning order to ensure the continuity of the neighboring coefficients. And then...
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...
A semi fragile watermarking scheme for remote sensing images is presented. The suggested scheme uses the signature of the multispectral or hyper spectral image to embed the mark and detects a forgery of the marked image, e.g. a tampered region. The original image is segmented in three-dimensional blocks and, for each block, a discrete Wavelet transform (DWT) and a tree structured vector quantizer...
The performance evaluation of watermarking scheme is done by two performance metrics: perceptual transparency and robustness. Perceptual transparency refers quality of image which is measured by `Peak Signal to Noise Ratio' (PSNR). Robustness is measured in terms of `Correlation Factor' (ρ). A good quality watermarking scheme should have maximum PSNR, ideally Correlation Factor equals to...
This paper presents a new human visual system (HVS) based adaptive digital watermarking scheme using discrete cosine transformation (DCT) and singular value decomposition (SVD) for copyright protection. For watermark embedding mask of the original image is computed using HVS model and original image is transformed into frequency domain using DCT. We embed watermark by modifying the singular values...
This paper considers a digital watermarking based on the modification of color image pixels, and proposes an improving method to improve its performance. Conceptually, in the watermark embedding process, an image averaging technique is considered and used to reduce the variation of pixel values, while in the watermark retrieval process, an tuning technique is implemented in the original pixel prediction...
In this paper, we propose a method used to improve the performance of the digital watermarking based on the modification in the blue channel of the image pixels. The main objective is to reduce the error prediction caused by the high different values of neighbor pixels. In the proposed method, the edge detection technique takes place in order to find out the high different values of neighbor pixels,...
Binary images have only two distinct pixel color values so the capability of data hiding is very limited. To improve the robustness of watermarking algorithm, we proposed a novel ridgelet based watermarking for binary images. Ridgelet transform is efficient for representing images with line singularities. So, binary host image is partitioned into several non-overlapping blocks to make edges in each...
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...
Watermarking is a simple and effective method that is frequently used to protect the copyright of an image. However, watermarks must be strong enough to resist various attacks. In this paper, two-level Discrete Wavelet Transform (DWT) and a trusted third party are applied to ensure the robustness of the watermarks and protect the copyright of an image. The experimental results showed that our proposed...
In this paper, we evaluate watermarking methods using Discrete Wavelet Transform (DWT). In order to clarify the difference of robustness of watermarks and the difference of image quality when decomposition level 1 and 2 of DWT are used, we perform experiments. In the experiments, we embed the digital watermarks in the frequency domain of still images. Then, we evaluate the degradation in image quality...
We propose a novel method to synthesize intermediate views from two stereo images and disparity maps that is robust to errors in disparity maps. The proposed method computes a placement matrix from each disparity map that can be used to correct errors when warping pixels from reference view to virtual view. The second contribution is a new hole filling method that uses depth, edge, and segmentation...
Many computer vision applications such as image filtering, segmentation and stereo-vision can be formulated as optimization problems. Whereas in previous decades continuous-domain, iterative procedures were common, recently discrete, convex, globally optimal methods have received a lot of attention. However not all problems in computer vision are convex, for instance L0 norm optimization such as seen...
Several algorithms for global motion estimation in video sequences using pixel- or block-based approaches have been published. Most known pixel-based methods lack in performance while when using block-based algorithms working on motion vectors, robustness to outliers and accuracy is missing. In this paper we present the fundamentals of a significantly improved, robust block-based method for global...
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