Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1996-04-26
1999-02-23
Moses, R. L.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 40, 355 56, 355 68, 25055902, 356443, 356444, 382291, G03B 2752, G06K 710, G01N 2100
Patent
active
058750223
ABSTRACT:
There is provided a film image detection method, comprising the steps of measuring densities at a large number of measurement points arranged along a first direction and a second direction crossing the first direction in a measurement area including an image recording range on a photographic film on which an image is recorded, calculating density variation amounts at the measurement points along the first and second directions on the basis of the densities at the measurement points in the measured measurement area, accumulating the calculated density variation amounts at the measurement points along the first direction for each of a plurality of first rows of measurement points constituted by a predetermined number of measurement points arranged along the second direction, and for accumulating the density variation amounts at the measurement points along the second direction for each of a plurality of second rows of measurement points constituted by a predetermined number of measurement points arranged along the first direction, and determining an image recording position and an image size on the basis of the first accumulated value of the density variation amounts of the plurality of first rows of measurement points, the second accumulated value of the density variation amounts of the plurality of second rows of measurement points, and the positions of the first and second rows of measurement points on the photographic film. Therefore, a boundary position of the image along the first direction can be determined with high accuracy by determining a portion having a first row of measurement points having the maximum accumulated value of density variation amounts in the plurality of first rows of measurement points as a boundary of the image along the first direction, and a boundary position of the image along the second direction can be determined with high accuracy by determining a portion having a second row of measurement points having the maximum accumulated value of density variation amounts in the plurality of second rows of measurement points as a boundary of the image along the second direction.
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patent: 5561494 (1996-10-01), Terashita
patent: 5671041 (1997-09-01), Iwaki
patent: 5703671 (1997-12-01), Narita et al.
Fuji Photo Film Co. , Ltd.
Moses R. L.
Virmani Shival
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