Results 251 to 260 of about 277,211 (280)
Some of the next articles are maybe not open access.
Optical Correlators: Applications
2015Optical correlators (OCs) have received much attention since VanderLugt’s invention in the mid-1960s, when he showed that pattern recognition can be optically realized using matched spatial filtering techniques. The classical VanderLugt correlator used photographic plates or film for carrying both pieces of information: the input and the reference, in ...
openaire +1 more source
Incoherent optical correlators
Proceedings of the IEEE, 1977The use of optical systems in signal processing applications can offer significant advantages over an equivalent electronic approach. These advantages stem chiefly from the high-speed analog multiply and parallel processing capability inherent in an optical system. This can be used to advantage in application areas requiring large quantities of data to
M.A. Monahan, K. Bromley, R.P. Bocker
openaire +1 more source
Miniaturized optical correlator
SPIE Proceedings, 1990A robust optical correlator that is a miniaturized version of the classic Vander-Lugt correlator is developed. The correlator consists of a simple diode laser for illumination and a CMOS photodetector to detect the correlation peak. A set of roof prisms is configured to fold the light path into a compact design.
Marija Strojnik +4 more
openaire +1 more source
Annual Meeting Optical Society of America, 1988
A nonlinear joint transform image correlator is investigated. The Fourier transform interference intensity is thresholded to provide higher correlation peak intensity and a better defined correlation spot. Analytical expressions for the thresholded interference intensity are provided.
Bahram Javidi +2 more
openaire +1 more source
A nonlinear joint transform image correlator is investigated. The Fourier transform interference intensity is thresholded to provide higher correlation peak intensity and a better defined correlation spot. Analytical expressions for the thresholded interference intensity are provided.
Bahram Javidi +2 more
openaire +1 more source
1985
This chapter addresses the principles, architectures and performance of acousto-optic correlator systems. Two specific applications which might benefit from these devices are considered, namely spread-spectrum signal processing and lidar ambiguity-function processing.
R. Bowman, P. V. Gatenby, R. J. Sadler
openaire +1 more source
This chapter addresses the principles, architectures and performance of acousto-optic correlator systems. Two specific applications which might benefit from these devices are considered, namely spread-spectrum signal processing and lidar ambiguity-function processing.
R. Bowman, P. V. Gatenby, R. J. Sadler
openaire +1 more source
Two-focal-length optical correlator
Applied Optics, 1989A two-focal-length coherent optical correlator design is presented that uses simple, single element lenses. Experimental autocorrelation results using a binary phase-only filter verify the performance of this compact design.
J L, Horner, C K, Makekau
openaire +2 more sources
Intelligent Optical Correlator
Optical Engineering, 1989By extracting the basic rectangular features of an object from a digitized Fourier transform image, one can calculate the scale factor and rotational angle of a rectangular object and use them to derotate and scale the input image. Thus, a scale- and rotational-invariant optical correlator is achieved. The accuracy of the computed scale and orientation
openaire +1 more source
Phase correlations and optical coherence
Optics Letters, 2012We examine the properties of the recently introduced degrees of coherence regarding the phase correlations of the optical field. It is seen that some of these quantities are straightforwardly related to the limits of complete dependence and complete independence of phases, which were used as the extremes of complete coherence and complete incoherence ...
Jani, Tervo +2 more
openaire +3 more sources
Fiber-optic fluorescence correlation spectrometer
Applied Optics, 2006Fluorescence correlation spectroscopy (FCS) is a sensitive technique used to probe size, concentration, flow velocity, and reaction kinetics in a dilute solution. Conventional FCS spectrometers achieve this sensitivity at the cost of using bulky optics.
Kanchan, Garai +2 more
openaire +2 more sources
Optical correlator using partial diffusers
Applied Optics, 1980A simple real-time optical correlator based on two contacting correlated partial diffusers is described. The illumination of such diffusers by coherent light produces Young's fringes with the spacing of the fringes determined by the lateral separation of the diffusers.
J F, Young, H M, van Driel
openaire +2 more sources