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In this paper an improvement to the steganalysis based on statistical moments of wavelet characteristic function (SMWCF) and artificial neural network (ANN) as classifier is presented, previous experiments have showed that this steganalysis system has a good performance in the detection of stego-image created by different steganography algorithms, but it has problems to the steganography based on...
Nowadays, there are two approaches for digital image authentication: the digital signature based approach and the watermarking based approach. Goal of both approaches is detection of tampered regions of an image, while tolerate incidental manipulations. In this paper two methods that belong to both approaches are developed and compared from tamper detection capability points of view. The digital signature...
This paper presents a hybrid active noise cancelling (ANC) system, to overcome the acoustic feedback present in most feedforward ANC system, together with an on line secondary path estimation scheme. The ANC system provides a suitable solution to two important problems present in most ANC systems. The acoustic feedback is reduced using two FIR adaptive filters with feedforward and feedback configurations,...
In this paper, we describe a watermarking system for digital color image authentication. This work is an extension of the Wong's work which is based on a Hash function to construct fragile watermarking system. The system is able to detect any change in the image even though it is minimal. Also the system indicates the regions where suffered alterations. In this system, YCrCb color space is used instead...
A new mother wavelet function is proposed, for audio and speech signal processing, which based on an inner ear model and a critical band concept that allows to emulate the ear behavior. When proposed wavelet function is used in pattern recognition applications, it performs the feature extraction of speech and audio segments, using signal decomposition similar to that taking place in the basilar membrane.
This paper proposes a video watermarking algorithm, where watermark embedding and detection process are carried out during MPEG-2 coding process. Watermark signal is embedded in DCT coefficients of I-frames and P- frames and the embedding energy is computed adaptively using perceptual information of the I-frames and the P-frames, and motion vectors information in the P-frame. Computer simulation results...
This paper proposes a face recognition algorithm in which the discrete Gabor transform is used to extract the image face features vector that is then feed into a multilayer perceptron to be carried out the recognition task. The features vector, estimated using the Gabor transform, presents a small intra-person variation while the inter-persons variation is considerably large. This fact provides robustness...
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