Journal ArticleDOI
Nonlinear joint transform correlator using one-dimensional Fourier transformation
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TLDR
In this paper, a nonlinear joint transform correlator (NJTC) was proposed for processing the data in a bidimensional image and the output of the NTC was obtained after two steps.Abstract:
We present a new method for processing the data in a nonlinear joint transform correlator (NJTC). The output of the NJTC is obtained after two steps. The first step consists of the acquisition of the joint power spectrum (JPS) of the images to be correlated. The JPS is in principle a bidimensional image. The second step is the calculation of the cross-correlation function. To do this, the JPS image is compressed to one dimension and a 1-D Fourier transform is performed. This significantly reduces the number of operations required to evaluate the crosscorrelation. To improve the cross-correlation sensitivity, a degree of nonlinearity is introduced using an illumination level above the saturation threshold of the camera used to acquire the JPS.read more
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Proceedings ArticleDOI
Optimization of a binary filter by direct binary search algorithm for rotation-invariant JTC
TL;DR: In this article, an optimum training process using a direct binary search algorithm for synthesising a spatial domain binary filter to implement in the joint transform correlator (JTC) architecture is presented.
Journal ArticleDOI
Space integrating joint transform correlator using a moving grating
TL;DR: In this article, a one-step joint transform correlator (JTC) is presented, in which the joint transform of the images to be correlated is filtered by a moving Ronchi ruling.
Proceedings ArticleDOI
Laser and optics in Uruguay
TL;DR: In this paper, the authors present an overview of several active areas of research that include nonlinear optic spectroscopy, applied optics, and theoretical modeling of laser dynamics, and present some of the experimental and theoretical studies in lasers and optics that have currently been performed in our country.
Proceedings ArticleDOI
Spatial integrating joint transform correlator for pattern recognition by use of an infinite grating filter
TL;DR: A joint transform correlator (JTC) is presented, which significantly reduces the processing time needed for real-time applications.