Measurement of image area from stored pixel data

Details Measurement of image area from stored pixel data Measurement of image area from stored pixel data

1987-05-05

1989-01-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356380, 364564, G01N 2186, G01B 1128

Patent

active

048002879

ABSTRACT:
Method and apparatus for determining the area of a contrasting image on a transfer sheet are disclosed. The contrasting image is scanned incrementally by a flat bed digital scanner having a single strip of light response cells. As the transfer sheet is advanced incrementally across the rear field of the scanner, the output of the sensor strip is read. Data words (pixels) corresponding to the logic "1" or logic "0" condition of each cell are stored in unique memory locations of random access memory. The number of black information pixels stored in RAM memory are counted. The number of black information pixels divided by the known sensor cell density yields the area of the contrasting image.

REFERENCES:
patent: 4661985 (1987-04-01), Akutsu
patent: 4687107 (1987-08-01), Brown et al.
patent: 4693378 (1987-09-01), Azegami et al.

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