Automatic snow/beach correction for photographic printer
Patent 4168121 Issued on September 18, 1979. Estimated Expiration Date: 
April 17, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 17, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 05/896812 filed on 04/17/1978US Classes:355/38, Including355/88Multicolor printingExaminersPrimary: Hix, L. T.Assistant: Brady, W. J. Attorney, Agent or FirmInternational ClassG03B 27/80 (20060101)AbstractAn automatic system for classifying photographic negatives containing snow or beach scenes measures the red, green, and blue densities of the negative to be printed. Signals indicative of red, green, and blue exposure times are derived from these measured densities, and the signal indicative of the blue exposure time is compared to the signals indicative of the red and green exposure times. The results of this comparison indicate whether a snow or beach scene is present. To determine the amount of density correction, if any, the densities of the negative at a plurality of points are measured. The extent of the density correction is determined by the number of points whose density is within a predetermined interval of the maximum density measured from any one of the points.Other References
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