The ever-expanding growth of the electronics and communications industries present new challenges for researchers. One these is generation required bandwidth signal over a specific time frame that used in variety contexts, particularly radar systems. To improve range resolution along with better SNR, it necessary to reduce increase peak power. There are some restrictions narrowband signals like...

This paper presents a new algorithm for reducing quantization artifacts in transform coded images. For transform coded signals, we analytically show that one can determine linear subspaces where most of the quantization artifacts reside. We formulate statistical constraints that identify these subspaces and propose a simple algorithm that removes them. Our formulation is general and is not tied...

the goal of this research is to predict total stock market index of tehran stock exchange, using the compound method of arima and neural network in order for the active participations of finance market as well as macro decision makers to be able to predict trend of the market. first, the series of price index was decomposed by wavelet transform, then the smooth's series  predicted by using...

The Hough Transform is the choice technique for identifying straight lines through digital images, with applications to high energy physics and computer vision. Classical methods for implementing the Hough transform of a N N binary image require to compute N3 additions over n = log2(N) bits integers, hence nN3 bit operations per transform. We introduce a new algorithm for computing the fast Hou...

| Some applications of the Discrete Fourier Transform (DFT) in coding and in cryptography are described. The DFT over general commutative rings is introduced and the condition for its existence given. Blahut's Theorem, which relates the DFT to linear complexity, is shown to hold unchanged in general commutative rings. I. The (Usual) Discrete Fourier Transform Let be a primitive N th root of uni...

The non-linear nature of the human visual response to achromatic contrast is a key element to improve the performance in achromatic image coding. Expressing transform coefficients in the appropriate contrast units is relevant when some particular non-linear processing hasto be applied. In the achromatic case, the use of non-linear psychophysical models is straightforward since achromatic contra...