The design of a digital-optical hybrid correlator is detailed. The optical Fourier transform lens design and mechanical lens housing are detailed as well as the video rate fast Fourier transform digital signal processing (DSP) hardware and overall electronic control. Example results using several different filters and modulation techniques are described.

The sources of errors associated with the measurement of nuclear radiations includethe noise associated with the radiation pulse, the dead time required for the processing of the incident radiation pulse and the pileup of pulses. In analogue processing, these errors are often downplayed leading to appreciable errors in the observed results. Some digital processors have been designed and built a...

Medical image processing using MATLAB is used in medical field. The recently many technologies are used for the diagnosis of eye diseases like conjunctivitis to observe infection on eye. This paper Digital image processing (DIP) is applied for manual judgment by doctors to get better & fast result. The diagnosis of “Intensity of redness of pink Eye” i.e. “Conjunctivitis”; by identifying the reg...

The application of a DSP96002 digital signal processor in measuring and transferring data, setting the preemphasis constants, and communicating with the MR tomograph is described in the paper. The application of the digital signal processor represents a modern approach to real-time processing of MR signals. The objective is to obtain distance communication with the tomograph via the Internet. K...

We suggest a basic fast algorithm for the noncoherent digital processing of the radio signals consisting of the minimum number of simple arithmetic operations over a signal period. On its basis there can be realized the algorithms and the correspondent digital devices for detection and noncoherent demodulation of signals with amplitude, frequency modulation and differential phase keying. Digita...

The DFT usually arises as an approximation to the continuous Fourier transform when functions are sampled at discrete intervals in space or time. The naive evaluation of the discrete Fourier transform is a matrix-vector multiplication W~g, and would take O(N) operations for N data-points. The general principle of the Fast Fourier Transform algorithms is to use a divide-and-conquer strategy to f...

Digital watermarks have been proposed as a method for discouraging illicit copying and distribution of copyrighted material. This paper describes a method for the secure and robust copyright protection of digital images. We present an approach for embedding a digital watermark into an image using the fast Fourier transform. To this watermark is added a template in the Fourier transform domain t...

Today, electron microscopy (EM) is increasingly confronted by the revolution in image-processing technology provoked by modern computers. Digital cameras are fast replacing film-based cameras in EM, as elsewhere, and the procedures for digital image-archiving, image-analysis, and image publication are rapidly evolving. To take advantage of these advances, we have chosen for the moment a 'middle...

Wireless sensors have several constraints, such as a short transmission range, poor processing capabilities, and a limited available energy. Our goal is to design an energyefficient sensor network by exploiting the concept of collaborative signal processing. We consider a network composed of multiple sensor nodes, each of which corresponds to a processor. By using an appropriate collaborative c...