Method for detecting blank frames in a photographic color printe

Facsimile and static presentation processing – Static presentation processing – Attribute control

Patent

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Details

Other Related Categories

358 75, 355 38, G03F 308, H04N 146, G03B 2780

Type

Patent

Status

active

Patent number

046511997

Description

ABSTRACT:
In automatic photographic printers, it is a problem to accurately detect and skip blank (unexposed or completely exposed) film frames automatically. The problem is solved by scanning a film frame in three colors to generate color value samples, compiling histograms of the color value samples, computing the standard deviations of the color histograms, comparing the standard deviations with predetermined constant values, and generating a signal indicating the presence of a blank frame when all the standard deviations are less than their respective predetermined constants. The method is particularly useful in a scanning-type color photographic printer employing histogram modification to effect tone-scale and color balance adjustments.

REFERENCES:
patent: 4239384 (1980-12-01), Treiber
patent: 4410909 (1983-10-01), Ueda et al.
patent: 4467364 (1984-08-01), Konagaya
patent: 4472736 (1984-09-01), Ushio et al.

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