In order to accurately estimate the geomagnetic transfer functions in the area of the volcano Mt. Iwate (IWT), we applied the interstation transfer function (ISTF) method to the three-component geomagnetic field data observed at Mt. Iwate station (IWT), using the Kakioka Magnetic Observatory, JMA (KAK) as remote reference station. Instead of the conventional Fourier transform, in which temporar...

Decomposing the wavelet transform in lifting steps allows a simpler implementation of the transform filters and provides the flexibility necessary to satisfy other requirements, e.g., generating non-linear integer-to-integer wavelet transforms. The paper presents a flow-graph approach to the lifting factorization that gives a better insight to the main features of single-phase and two-phase wav...

Image watermarking technique is one of effective solutions to protect copyright, and it applied a variety information security application domains. It needs meet four requirements imperceptibility, robustness, capacity security. A multi-scale secure image method proposed in this work, which based on the Integer Wavelet Transform (IWT) Singular Value Decomposition (SVD). Four IWT sub-bands are f...

Health IoT deals with sensitive medical information of patients, therefore security concerns need to be addressed. Confidentiality Electronic Record (EHR) and privacy are two important requirements for based healthcare systems. Recently, watermarking algorithms as an efficient response these is in the spotlight. Further, smart city-based applications have react real-time situations, computation...

Steganography is the science of “invisible” communication. The purpose of Steganography is to maintain secret communication between two parties. The secret information can be concealed in content such as image, audio, or video. This paper provides a novel image steganography technique to hide multiple secret images and keys in color cover image using Integer Wavelet Transform (IWT). There is no...

In the security of digital contents, almost all previous works tried to attend either the copyright protection issue or the content authentication issue, however recently some proposals try to solve simultaneously both problems. In this paper, a multipurpose method that tries to solve both problems for color images, using two watermarking algorithms, is proposed. The first algorithm is based on...

Steganography is used to hide a secret message within a cover image, thereby yielding a stego image such that even the trace of the presence of secret information is wiped out. The purpose of steganography is to maintain secret communication between two users. Steganography has several technical challenges namely high hiding capacity and imperceptibility. Steganographic technique with Integer W...

(invertible, lossless) authentication draws much attention recently for its ability to restore the original image from marked image without any distortions upon verification. In this paper, we propose a reversible water-marking scheme for image authentication based on histogram modification in integer wavelet transform (IWT) domain. The proposed scheme has features: i) Reversibility, high embed...