Method of detecting principal subject image and determining expo

Details Method of detecting principal subject image and determining expo Method of detecting principal subject image and determining expo

1986-04-30

1987-05-26

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Methods

355 38, 355 68, G03B 2732, G03B 2780

Patent

active

046680829

ABSTRACT:
Color densities of a color original are measured for a number of picture elements into which the color original is divided. A part of the color original that includes at least one picture element is selected, with whose measured color densities the measured color densities of each picture element are compared to detect picture elements of color densities having a certain relation to the color densities of the selected part of the color original. The picture elements of sufficiently similar color densities can define an extent of image which determines a principal subject image and the remainder of which is background. For the individual image, at least one characteristic value peculiar to the image is then calculated by utilizing the measured color densities of picture elements, and on the basis of the characteristic values the scene of the original is classified to select one of a plurality of previously provided exposure calculating formulas in order to determine the proper exposure for obtaining color prints of proper color balance and density.

REFERENCES:
patent: 3708676 (1973-01-01), Huboi et al.
patent: 3790275 (1974-02-01), Huboi et al.
patent: 4017179 (1977-04-01), Pone, Jr. et al.
patent: 4080066 (1978-03-01), Betzold et al.
patent: 4168121 (1979-09-01), Freier et al.
patent: 4279505 (1981-07-01), Ursprung et al.
patent: 4353641 (1982-10-01), Merlo

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