Image identification apparatus and image identification method

Details Image identification apparatus and image identification method Image identification apparatus and image identification method

1996-04-26

1998-11-24

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

35 38, G03B 2752, G03B 2780

Patent

active

058415181

ABSTRACT:
An image size identification apparatus and an image size identification method capable of identifying the size of an image recorded on a photographic film at a high accuracy are disclosed.
Densities at a plurality of measurement points in a density measurement area including an image recording range on a photographic film on which an image is recorded are measured. On the basis of the measured densities, image characteristics which reflect an image size are extracted to determine the image size. An image portion is estimated on the basis of a measurement area, and a distribution of the estimated image in the measurement area can be used as the image characteristics which reflect the image size. The degree of dispersion of densities or density change amounts in a predetermined determination area in the measurement area can be used as the image characteristics which reflect an image size. When one or both of these characteristics are used, an image size can be identified at an accuracy higher than that of prior art.

REFERENCES:
patent: 5210570 (1993-05-01), Minamisawa et al.
patent: 5555181 (1996-09-01), Seto
patent: 5561494 (1996-10-01), Terashita
patent: 5671041 (1997-09-01), Iwaki
patent: 5734463 (1998-03-01), Yoshikawa

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