Robotic vision, optical correlation system

Details Robotic vision, optical correlation system Robotic vision, optical correlation system

1988-08-25

1990-09-18

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

35016212, G06K 900

Patent

active

049583760

ABSTRACT:
A robotic vision, optical correlation system which optically compares an input image with optical information stored in a multiple array of matched filters to provide identification and aspect information about the input image. The input image is incident upon a spatial light modulator, and the input image spatially modulates a coherent beam of radiation. A multiple holographic lens has the spatially modulated radiation beam incident thereon, and performs a multiple number of Fourier transformations thereon to obtain an array of a multiple set of Fourier transforms of the spatially modulated radiation beam. The array of matched filters has the array of Fourier transforms incident thereon, and each matched filter comprises a Fourier transform hologram of an aspect view of an object of interest. Each matched filter passes an optical correlation signal in dependence upon the degree of correlation of the Fourier transform of the spatially modulated radiation beam with the Fourier transform recorded by the matched filter. An inverse Fourier transform lens receives the optical correlation outputs of the array of matched filters, and performs an inverse Fourier transformation on each optical correlation output. A detector then detects the inverse Fourier transform of each optical correlation output, and produces a detector output signal representative thereof. A processing circuit compares the relative magnitudes of the signals to determine aspect information about the input image. The present invention includes a normalizing means for each matched filter channel in the system, which can be electronic or optical, to normalize the signals for the different matched filters. The normalizing means operates on the basis of a separate angular response curve which is generated for each matched filter.

REFERENCES:
patent: 3779492 (1973-12-01), Grumet
patent: 3851308 (1974-11-01), Kawasaki et al.

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