Image analysis – Histogram processing – For setting a threshold
Patent
1990-07-16
1992-02-25
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
395 1, G06K 900
Patent
active
050919652
ABSTRACT:
A video image processing apparatus in which an analog video image can be satisfactorily converted to a binary value by calculating theshold values of respective neurons and coupling coefficients of respective synapses of a neural network circuit on the basis of the input analog video image and a pre-determined function.
By arranging so a difference component E between the input analog video image and the binary value video image is defined as ##EQU1## where .alpha. is the coefficient, u.sub.(i) is the value which results from converting the input analog video image into the binary value, and P.sub.(i,j) is the value obtained from the function and g.sub.(i) is the value which is obtained from the function and the input analog video image, it is possible to convert the video image into the binary value by the use of the neural network circuit.
Further, by setting that the function to have a frequency characteristic of a human's eyes, it is possible to obtain a binary value video image which is excellent from a human's visual standpoint.
Furthermore, if the input analog video image is a computer hologram and the function is a window function which indicates a range of a desired video image in a reproduced image which results from Fourier-transforming the computer hologram, the noise in the range of the desired video image in the reproduced video image can be reduced to provide an excellent reproduced image.
REFERENCES:
patent: 4707859 (1987-11-01), Nudd et al.
patent: 4876731 (1989-10-01), Loris et al.
patent: 4954963 (1990-09-01), Penz et al.
patent: 4989256 (1991-01-01), Buckley
Kobayashi Seiji
Psaltis Demetri
Boudreau Leo H.
California Institute of Technology
Frommer William S.
Sinderbrand Alvin
Sony Corporation
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