Optical image encoding and comparing using scan autocorrelation
Patent 4745633 Issued on May 17, 1988. Estimated Expiration Date: 
August 18, 2006. 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.
August 18, 2006. 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 References 3222638 3267431 3860909 Method and device for recognizing a specific pattern Method and circuit arrangement for formation of features for automatic character recognition Patent #: 4398177 InventorsApplicationNo. 06/897780 filed on 08/18/1986US Classes:382/243, Shape, icon, or feature-based compression382/199, Pattern boundary and edge measurements382/278CorrelationExaminersPrimary: Groody, James J.Assistant: Parker, Michael D. International ClassG06K 9/50 (20060101)AbstractA method for encoding shape and pattern information from the image (20) of an electronic camera (10). The image is converted into a discrete array of values (30), and the values in the cross sections of the array are sampled (circuit 40), marked for transitions (circuit 50), and the transition markers are then autocorrelated by circuit 60 to form an autocorrelation function for each cross section. The autocorrelation functions corresponding to each cross section are then combined by circuit 70 into a global summary function, which provides a quantitative measure of the information contained in the image. The global summary functions which are derived from images may be used to judge their similarity or otherwise compare and classify them.Other References
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