Patent Document ID: 9922220
Application ID: 15176498
Patent Status: 1

Claim One:
1. A method of enhancing operation of a visual recognition system that is allotted a limited time interval to produce an identification result, which system includes a camera that provides image frames for extraction of digital watermark data therefrom, the method comprising the acts: (a) for one sub-part of one image frame, applying at least M different values of tilt-angle correction in attempting to extract digital watermark data from M resultant tilt angle-corrected counterparts of said one sub-part of said one image frame, where M>1; (b) performing act (a) at least N times, each with a differently-located sub-part of said one image frame, where N>1, wherein extraction of digital watermark data from said one image frame is attempted for at least M*N combinations of tilt angle correction values and sub-part locations; (c) performing act (b) plural times, each with a different image frame drawn from a set P of image frames; (d) determining which single combination of tilt angle correction value and sub-part location resulted in successful extraction of digital watermark data from a greatest number of said image frames in said set P; adding this combination of tilt angle correction value and sub-part location to a listing of decoding parameters; and removing, from the set P, those image frames from which digital watermark data was successfully extracted using said combination of tilt angle correction value and sub-part location; and (e) repeating act (d) one or more times with successively smaller sets P; wherein the method yields a listing of decoding parameters that is ranked by likelihood of successfully extracting unique digital watermark data from an image frame, given the previous application of other decoding parameters in said listing, wherein attempts to extract digital watermark data from a new image can successively apply parameters from said ranked listing until said limited time interval elapses.