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Identification and verification of a video clip via its hash find application in broadcast monitoring. For broadcast monitoring, a novel method for computing a robust hash from video clips, being secret key based, is proposed based on the 3-D Discrete Wavelet Transform (3D-DWT) and median quantization. The proposed hash function is shown to be remarkably robust against video modifications and lossy...
Steganography gained importance in the past few years due to the increasing need for providing secrecy in an open environment like the internet. With almost anyone can observe the communicated data all around, steganography attempts to hide the very existence of the message and make communication undetectable. Many techniques are used to secure information such as cryptography that aims to scramble...
In this paper, a watermarking algorithm for ROI (Regions of Interesting) authentication and tamper detection is proposed. The watermarking is embedded in the DWT (Discrete Wavelet Transform) coefficients of the ROB (Regions of Background). The algorithm uses a hashing to detect whether the ROI of image is tampered, and then uses the watermarking to reconstruct the data of ROI. The experiment results...
According to texture analysis in low frequency sub-band of DWT, an adaptive image hiding algorithm is proposed. The low-frequency part of DWT is classified as smooth, edge and texture region by entropy and standard deviation, and different regions are assigned with different hiding bits, which will increase the hiding capacity. The blind detection is accomplished by resetting low bits in DWT low-frequency...
A new robust watermarking scheme based on discrete wavelet transform(DWT) is proposed. The proposed scheme embeds a watermark into a host image twice in two different frequency ranges to withstand different type of image processing operations or even deliberate attacks. The host image will be decomposed to different frequencies in different resolution levels by DWT, and then the watermark is embedded...
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