Method of detecting principal subject images and determining exp

Details Method of detecting principal subject images and determining exp Method of detecting principal subject images and determining exp

1986-04-24

1988-09-06

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358 80, 355 38, H04N 146, G03B 2780

Patent

active

047696958

ABSTRACT:
Three 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 color based on the measured densities thereof the color of each picture element based on the measured densities is compared to detect picture elements having colors identical or similar to the color of the selected part of the color original. The picture elements of the identical or similar colors 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 characteristics 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.

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patent: 4693596 (1987-09-01), Shigaki

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