Image signal processing method and apparatus

Details Image signal processing method and apparatus Image signal processing method and apparatus

1988-05-25

1989-10-24

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 52, 358 36, 358 37, 358166, 358167, G06K 944

Patent

active

048767344

ABSTRACT:
In an image signal processing apparatus or method in which first picture element data for one image are added to second picture element data respectively to provide addition data for subsequently averaging, a first memory has memory regions for storing some of the first picture element data and an "empty" memory region for storing at least one picture element, a second memory has memory regions for storing the remaining first picture element data, a first operation is performed in which one of the second picture elements is added to a corresponding picture element output from the second memory, the result of the addition is stored in the empty region of the first memory, and the memory region thus emptied is selected as the next "empty" memory region, and a second operation is performed in which the next picture element of the second picture element data is added to a corresponding picture element data output from the first memory, the result of the addition is stored in the next "empty" memory region, and the memory region thus emptied is selected as the next empty memory region, and so on. The data provided by the addition operations are divided by the number of addition operations to provide the averaged data.

REFERENCES:
patent: 4468704 (1984-08-01), Stoffel et al.
patent: 4593316 (1986-06-01), Keller et al.
R. L. Sapirstein, "Improving Low-Illumination Video", NASA Tech. Briefs., Spring 1979, p. 18.

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