Hierarchical watermarking depending on local constraints
نویسندگان
چکیده
In this paper we propose a new watermarking technique where the watermark is embedded according to two keys. The first key is used to embed a code bit in a block of pixels. The second is used to generate the whole sequence of code bits. The watermark is embedded in spatial domain by adding or subtracting a random digital pattern to the given image signal. The embedding depth level depends on the spectral density distribution of the DCT coefficients and on the JPEG quantization table. The label consists of a set of bits which are embedded locally in a rectangular set of blocks and it is repeated over the entire image. After detecting individual bits, the retrieved label is verified by performing a XOR operation to the watermark code.
منابع مشابه
Proposing an effective approach for Network security and multimedia documents classically using encryption and watermarking
Local binary pattern (LBP) operators, which measure the local contrast within a pixel's neighborhood, successfully applied to texture analysis, visual inspection, and image retrieval. In this paper, we recommend a semi blind and informed watermarking approach. The watermark has been built from the original image using Weber Law. The approach aims is to present a high robustness and imperceptibi...
متن کاملIncreasing the Capacity and PSNR in Blind Watermarking Resist Against Cropping Attacks
Watermarking has increased dramatically in recent years in the Internet and digital media. Watermarking is one of the powerful tools to protect copyright. Local image features have been widely used in watermarking techniques based on feature points. In various papers, the invariance feature has been used to obtain the robustness against attacks. The purpose of this research was based on local f...
متن کاملHierarchical Watermarking Framework Based on Analysis of Local Complexity Variations
Increasing production and exchange of multimedia content has increased the need for better protection of copyright by means of watermarking. Different methods have been proposed to satisfy the tradeoff between imperceptibility and robustness as two important characteristics in watermarking while maintaining proper data-embedding capacity. Many watermarking methods use image independent set of p...
متن کاملA Novel Blind Watermarking of ECG Signals on Medical Images Using EZW Algorithm
Introduction:In this study, ECG signals have been embedded into medical images to create a novel blind watermarking method. The embedding is done when the original image is compressed using the EZW algorithm. The extraction process is performed at the decompression time of the watermarked image. Materials and Methods: The multi-resolution watermarking with a secret key algorithm developed in th...
متن کاملWatermarking low bit-rate Advanced Simple Profile MPEG-4 bitstreams
This paper presents a novel watermarking method for low bitrate video that is compressed according to the Advanced Simple Profile of MPEG-4. A spatial spread spectrum watermark was embedded directly to the MPEG-4 bit-streams by adopting Hartung’s approach of watermarking MPEG-2 compressed bitstreams. A synchronization template was employed to combat cropping, scaling, and rotation. A gain contr...
متن کامل