In this paper a novel approach to embed watermark into the host image using quantization with the help of Dynamic Fuzzy Inference System (DFIS) is proposed. The cover image is decomposed up to 3- levels using quantization and Discrete Wavelet Transform (DWT). A bitmap of size 64x64 pixels is embedded into the host image using DFIS rule base. The DFIS is utilized to generate the watermark weighting function to embed the imperceptible watermark. The implemented watermarking algorithm is imperceptible and robust to some normal attacks such as JPEG Compression, salt&pepper noise, median filtering, rotation and cropping.
Keywords: Watermark, Quantization, Dynamic Fuzzy Inference System, Imperceptible, Robust, JPEG Compression, Cropping.
Teleradiology enables medical images to be transferred over the computer networks for many purposes including clinical interpretation, diagnosis, archive, etc. In telemedicine, medical images can be manipulated while transferring. In addition, medical information security requirements are specified by the legislative rules, and concerned entities must adhere to them. In this research, we propose a new scheme based on 2-dimensional Discrete Wavelet Transform (2D DWT) to improve the robustness and authentication of medical images. In addition, the current research improves security and capacity …
Robust Audio Watermarking Against the D/A and A/D conversions
音频水印技术在多媒体信息安全中发挥着重要的作用。在许多音频水印应用中，经常涉及到D/A和A/D转换（本文用DA/AD表示）。然而，在以前的作品中，音频水印对DA/AD转换的鲁棒性问题尚未引起足够的重视。在我们广泛的调查中，已经发现，由DA/AD转换引起的水印音频信号的劣化主要表现在波形幅度失真和线性时间缩放方面，使得水印提取失败。因此，本文提出了一种基于小波变换的音频水印算法，该算法对DA/AD转换具有鲁棒性。为了抵抗幅度失真，该算法利用低频子带内不同DWT系数组之间的相对能量关系，通过自适应控制嵌入强度来嵌入水印。此外，该算法还设计了一种处理线性时间尺度的方法。利用小波变换的时频局部化特性，减少了小波变换的计算量。实验结果表明，该音频水印算法对DA/AD转换、其他常见的音频处理操作以及StirMark Benchmark for Audio中的攻击具有较好的鲁棒性。
Development of digital content has increased the necessity of copyright protection by means of watermarking. Imperceptibility and robustness are two important features of watermarking algorithms. The goal of watermarking methods is to satisfy the tradeoff between these two contradicting characteristics. Recently watermarking methods in transform domains have displayed favorable results. In this paper, we present an adaptive blind watermarking method which has high transparency in areas that are important to human visual system. We propose a fuzzy system for adaptive control of the embedding st…
With the growth of digital networks such as the Internet, digital media have been explosively developed in e-commerce and online services. This causes problems such as illegal copy and fake ownership. Watermarking is proposed as one of the solutions to such cases. Among different watermarking techniques, the wavelet transform has been used more because of its good ability in modeling the human visual system. Recently, Shearlet transform as an extension of Wavelet transform which is based on multi-resolution and multi-directional analysis is introduced. The most important feature of this transf…
A novel diverse domain (DCT-SVD & DWT-SVD) watermarking scheme is proposed in this paper. Here, the watermark is embedded simultaneously onto the two domains. It is shown that an audio signal watermarked using this scheme has better subjective and objective quality when compared with other watermarking schemes. Also proposed are two novel watermark detection algorithms viz., AOT (Adaptively Optimised Threshold) and AOTx (AOT eXtended). The fundamental idea behind both is finding an optimum threshold for detecting a known character embedded along with the actual watermarks in a known location, …
Digital image watermarking has been widely used in different applications such as copyright protection of digital media, such as audio, image, and video files. Two opposing criteria of robustness and transparency are the goals of watermarking methods. In this paper, we propose a framework for determining the appropriate embedding strength factor. The framework can use most DWT and DCT based blind watermarking approaches. We use Mask R-CNN on the COCO dataset to find a good strength factor for each sub-block. Experiments show that this method is robust against different attacks and has good tra…
One of the problems of conventional visual quality evaluation criteria such as PSNR and MSE is the lack of appropriate standards based on the human visual system (HVS). They are calculated based on the difference of the corresponding pixels in the original and manipulated image. Hence, they practically do not provide a correct understanding of the image quality. Watermarking is an image processing application in which the image's visual quality is an essential criterion for its evaluation. Watermarking requires a criterion based on the HVS that provides more accurate values than conventional m…
Digital images can be copied without authorization and have to be protected. Two schemes for watermarking images in PDF document were considered. Both schemes include a converter to extract images from PDF pages and return the protected images back. Frequency and spatial domain embedding were used for hiding a message presented by a binary pattern. We considered visible and invisible watermarking and found that spatial domain LSB technique can be more preferable than frequency embedding using DWT.
Islamic Azad University, Doroud Branch（伊斯兰阿扎大学多鲁德分校）；Islamic Azad University, Boroujerd Branch（伊斯兰阿扎大学布鲁杰尔德分校）
Steganography is a method that can improve network security and make communications safer. In this method, a secret message is hidden in content like audio signals that should not be perceptible by listening to the audio or seeing the signal waves. Also, it should be robust against different common attacks such as noise and compression. In this paper, we propose a new speech steganography method based on a combination of Discrete Wavelet Transform, Graph-based Transform, and Singular Value Decomposition (SVD). In this method, we first find voiced frames based on energy and zero-crossing counts…
