Abnormal negative discriminating method

Abstract

Abstract PURPOSE: To discriminate abnormal negatives and normal negatives from each other, by dividing a negative to many minute parts and obtaining an average value of characteristic values obtained from photometric values of these parts. CONSTITUTION: The surface of a color photographic film is scanned by a scanner 1, and decomposed lights of three colors; blue, green, and red are subjected to photometry in a photomultiplexer 2, and each of them is amplified by an amplifier 3, and these lights are sample-held in a sample hold circuit 4 by sampling pulses from a scanner controlling circuit 5. These measuerd signals are subjected to logarithmic conversion in a logarithmic converting circuit 6 to calculate color densities of blue, green, and red and are sent to a normalizing circuit 7 to perform the correction and the sensitivity correction in accordance with the film and are sent to an interface 8 and are stored in a memory 9 where addresses are designated by measured position signals from the circuit 5. Characteristic values for exposure operation and characteristic values for abnormal negative discrimination are calculated in a CPU, and added characteristic values are averaged at the end of the last of a series negatives, and it is discriminated whether these nagatives are abnormal or not. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Takaaki Terashita

Bibliographic Details