Optical ranked-order filtering using threshold decomposition

Details Optical ranked-order filtering using threshold decomposition Optical ranked-order filtering using threshold decomposition

1987-10-09

1990-08-14

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 42, 35016212, 35016213, G06K 976

Patent

active

049493892

ABSTRACT:
A hybrid optical/electronic system performs median filtering and related ranked-order operations using threshold decomposition to encode the image. Threshold decomposition transforms the nonlinear neighborhood ranking operation into a linear space-invariant filtering step followed by a point-to-point threshold comparison step. Spatial multiplexing allows parallel processing of all the threshold components as well as recombination by a second linear, space-invariant filtering step. An incoherent optical correlation system performs the linear filtering, using a magneto-optic spatial light modulator as the input device and a computer-generated hologram in the filter plane. Thresholding is done electronically. By adjusting the value of the threshold, the same architecture is used to perform median, minimum, and maximum filtering of images. A totally optical system is also disclosed.

REFERENCES:
patent: 4442544 (1984-04-01), Moreland et al.
patent: 4462046 (1984-07-01), Spight
patent: 4468704 (1984-08-01), Stoffel et al.
patent: 4695973 (1987-09-01), Yu
patent: 4765714 (1988-08-01), Horner et al.
patent: 4826285 (1989-05-01), Horner
patent: 4832447 (1989-05-01), Javidi
J. P. Fitch, E. J. Coyle, and N. C. Gallagher, Jr., "Median Filtering by Threshold Decomposition", IEEE Trans. on Acoustics, Speech, and Signal Proc. vol. ASSP-32, No. 6, pp. 1183-1188, 1984.
A. D. Fisher, "A Review of Spatial Light, Modulators", Proceedings of the OSA Topical Meeting on Optical Computing, Incline Village, NV 1985.
K. S. O'Neill and W. T. Rhodes, "Morphological Transformations by Hybrid Optical-Electronic Methods", Proc. SPIE, vol. 638, 1986.

Affiliated with

Also associated with

Rating

Optical ranked-order filtering using threshold decomposition does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical ranked-order filtering using threshold decomposition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical ranked-order filtering using threshold decomposition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-468850