The idea of a lapped transform (LT, for short) maintaining orthogonality and nonexpansion of the samples was developed in the early 80’s at MIT by a group of researchers unhappy with the blocking artifacts so common in traditional block transform coding of images. The idea was to extend the basis function beyond the block boundaries, creating an overlap, in order to eliminate the blocking effec...

Block frames called directional analytic discrete cosine frames (DADCFs) are proposed for sparse image representation. In contrast to conventional overlapped frames, the DADCFs require a reduced amount of 1) computational complexity, 2) memory usage, and 3) global access. These characteristics strongly required current high-resolution processing. Specifically, we propose two based on tra...

The discrete cosine transform (DCT), introduced by Ahmed, Natarajan and Rao, has been used in many applications of digital signal processing, data compression and information hiding. There are four types of the discrete cosine transform. In simulating the discrete cosine transform, we propose a generalized discrete cosine transform with three parameters, and prove its orthogonality for some new...

Late innovative movement has made it simple for interrupter to adjust the sight and the sound substance transmitted over the network. digital watermarking is a procedure, where computerized implanting of the copyright information or watermark into the information to be ensured or secured. The two noteworthy ways or methods of doing that assurance are spatial area and the powerful change space. ...

Time-frequency analysis is a powerful tool for signal analysis and processing. The Fourier transform and wavelet transforms are used extensively as is the Short-Time Fourier Transform (or Gabor transform). In 1996 the Stockwell transform was introduced to maintain the phase of the Fourier transform, while also providing the progressive resolution of the wavelet transform. The discrete orthonorm...

In this paper we propose three robust and semi-blind digital color image watermarking algorithms. These algorithms are based on hybrid transforms using the combination of Discrete Cosine Transform (DCT) and Singular Value Decomposition (SVD), Discrete Wavelet Transform (DWT) and Singular Value Decomposition (SVD), Discrete Wavelet Transform (DWT), Discrete Cosine Transform (DCT) and Singular Va...

Time-frequency masking is often used for source separation of underdetermined audio mixtures. It depends on the fact that the sources can be represented disjointly in some transform domain. The focus of this paper is on demixing sources from instantaneous, two-channel mixtures by binary masking. We investigate trees of local cosine bases from which a suitable transform may be generated—the best...

In this paper, a new technique is proposed for field effect transistor (FET) small-signal modeling using neural networks. This technique is based on the combination of the Mel-frequency Cepstral Coefficients (MFCCs) with the different discrete transforms such as the discrete cosine transform (DCT), the discrete sine transform (DST), and the discrete wavelet transform (DWT) of the inputs to the ...

Image compression can improve the performance of the digital systems by reducing time and cost in image storage and transmission without significant reduction of the image quality. Furthermore, the discrete cosine transform has emerged as the new state-of-the art standard for image compression. In this paper, a hybrid image compression technique based on reversible blockade transform coding is ...