Results 211 to 220 of about 477,356 (259)
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Optimal real correlation filters
Applied Optics, 1991Expressions are derived for real filters that have a maximum correlation signal to noise ratio. Both continuous and discrete cases are treated and shown to have similar forms. The signal can be complex, and the case of a real signal is considered and related to previous results.
R D, Juday, B V, Kumar, P K, Rajan
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Wiener-like correlation filters
Applied Optics, 2000We introduce a new, to our knowledge, design for a Wiener-like correlation filter, which consists of cascading a phase-only filter (POF) with a photorefractive Wiener-like filter. Its performance is compared with that of the POF and the Wiener correlation filter (WCF).
J, Khoury, P D, Gianino, C L, Woods
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Acoustooptic matched filter correlator
Applied Optics, 1982The signal model used and the output SNR(0) measure chosen are shown to affect the performance of an acoustooptic time-integrating correlator. Nonuniform acoustic fields are also shown to affect the results, but these error sources can be overcome with a new hybrid time- and space-integrating acoustooptic matched filter correlator that we describe and ...
D, Casasent, G, Silbershatz, B V, Kumar
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Wavelet filtering of correlated speckle
SPIE Proceedings, 2003In practice, SAR images are very often disturbed by a correlated speckle noise. Correlation influence on wavelet coefficients is a difficult problem degrading detection and filtering performances dramatically. We establish a simple analytic relation between high order wavelet coefficient moments/cumulants and speckle second order statistics.
Samuel Foucher +2 more
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Zero-aliasing correlation filters
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA), 2013Traditional correlation filters are designed and implemented via the frequency domain, where the correlation of two signals may be computed efficiently. However, when the discrete Fourier transform (DFT) of length N is used, multiplication in the frequency domain results in an N-point circular correlation, rather than a linear correlation.
Joseph A. Fernandez +1 more
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Correlation Filters for Object Alignment
2013 IEEE Conference on Computer Vision and Pattern Recognition, 2013Alignment of 3D objects from 2D images is one of the most important and well studied problems in computer vision. A typical object alignment system consists of a landmark appearance model which is used to obtain an initial shape and a shape model which refines this initial shape by correcting the initialization errors.
Vishnu Naresh Boddeti +2 more
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Quadratic correlation filters for optical correlators
SPIE Proceedings, 2003Linear correlation filters have been implemented in optical correlators and successfully used for a variety of applications. The output of an optical correlator is usually sensed using a square law device (such as a CCD array) which forces the output to be the squared magnitude of the desired correlation.
Abhijit Mahalanobis +2 more
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Object Tracking by Branched Correlation Filters and Particle Filter
2017 4th IAPR Asian Conference on Pattern Recognition (ACPR), 2017Correlation filter based tracking which is one of the tracking-by-detection methods, has demonstrated competitive performance in recent years. However, once the detected position is incorrect, the parameter of correlation filter is updated based on the appearance of the incorrect position.
Hitoshi Nishimura +3 more
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Correlation filters with controlled scale response
IEEE Transactions on Image Processing, 2006Correlation filtering methods are becoming increasingly popular for image recognition and location. The recent introduction of optimal tradeoff circular harmonic function filters allowed the user to specify the response of a correlation filter to in-plane rotation distortion. In this paper we introduce a new correlation filter design that can provide a
Ryan A. Kerekes, B. V. K. Vijaya Kumar
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Geophysics, 1954
Abstract Correlation analysis techniques may be applied to seismic data already subjected to standard recording and analysis procedure in an effort to extract additional information, or to raw data as an alternative filtering method. These techniques involve determination of certain parameters which provide a quantitative measure of ...
Hal J. Jones, John A. Morrison
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Abstract Correlation analysis techniques may be applied to seismic data already subjected to standard recording and analysis procedure in an effort to extract additional information, or to raw data as an alternative filtering method. These techniques involve determination of certain parameters which provide a quantitative measure of ...
Hal J. Jones, John A. Morrison
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