Image analysis – Histogram processing – For setting a threshold
Patent
1989-02-27
1992-12-29
Harkcom, Gary V.
Image analysis
Histogram processing
For setting a threshold
382 42, 382 45, G06F 1500
Patent
active
051758024
ABSTRACT:
An image processing system (10) includes an array (12) of detectors (14), each of which is designed to produce a current proportional to incident radiation. This system provides image processing at a viable sampling rate even for very large arrays and permits very efficient determination of single element detections. The modulation functions are supplied from a weighted summer (18). The weighted summer applies an invertible matrix of weights to a series of orthogonal Walsh functions defined over a predetermined sampling interval, the Walsh functions being generated by a function generator (16). The modulated outputs of the array are combined by summer 20 and distributed among parallel channels by a divider (22). Correlators (24) correlate the signal in each channel with a respective of the original Walsh functions. The correlated outputs are digitized by analog-to-digital converters for transmission and processing by a digital processor (28). The processor can at least partially reconstruct the detected spatial distribution for output to a display (30). The modulated detector output arrangement can be combined in a hierarchical manner to process groups of subarrays in the same manner that individual pixels are processed.
REFERENCES:
patent: 4622632 (1986-11-01), Tanimoto et al.
patent: 4674125 (1987-06-01), Carlson et al.
patent: 4809194 (1989-02-01), Crookshanks
Denson-Low Wanda K.
Harkcom Gary V.
Hughes Aircraft Company
Streeter William J.
Zimmerman Mark K.
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