Methods and apparatus for discriminating between the front and b

Details Methods and apparatus for discriminating between the front and b Methods and apparatus for discriminating between the front and b

1984-05-23

1987-02-24

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

250201, G01N 2100

Patent

active

046453512

ABSTRACT:
A method and apparatus for discriminating a surface of a developed film focuses a picture pattern on a film disposed at a reference position. One or two sensors are then located at focused positions of the picture pattern of the film when the front surface of the film is at the reference position and when the back surface of the film is at the reference position, respectively. The two resultant sensor outputs are then band-pass filtered to extract the portions of the outputs within a predetermined frequency range. The resultant outputs are then rectified and integrated and then compared by a comparator whose outputs is a first value when the front surface of the film is at the reference position and is a second different value when the back surface of the film is at a reference position.

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