Patent
Fast two dimensional fourier transform device
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TLDR
In this paper, a series of stored images representing sine and cosine components of the Fourier transform is generated to obtain a fast, two-dimensional transform of the image.Abstract:
Two dimensional optical or electrical images are processed through a storage tube designed to yield the correlation function between the input images and stored images. By generating a series of stored images representing sine and cosine components of the Fourier transform, a fast, two-dimensional transform of the image is obtained.read more
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References
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Patent
Apparatus and methods for deriving in essentially real time continuous electrical representations of the fourier and inverse fourier transform
TL;DR: In this paper, an approach for deriving in essentially real-time unweighted and weighted continuous electrical representations of the Fourier transform and/or the inverse-fourier transform of a complex waveform is presented.
Patent
Correlation methods and apparatus utilizing mellin transforms
TL;DR: In this paper, the scale and shift invariant Mellin transform is used for correlation and data is available for determining any scale difference between the input and reference data, and a scale invariant correlation method and apparatus are described.
Patent
Multi-channel optical correlation system
TL;DR: In this paper, a multi-channel optical correlation system employs a light source to illuminate a mask having a plurality of linearly disposed channels, each of which has recorded information defined by variations in opacity along its linear length.