| 摘要 |
An improved method for finding the mask threshold for a maskable bilevel correlator operates on a series of frames of information. Beginning with an initial threshold, two rates are computed. The rate of change of the correlation peak magnitude P(T), a function of threshold T, with respect to the change in the value of the mask threshold T, or (dP(T)/dT), and the corresponding rate of change of correlation reference pixels with magnitude exceeding the mask threshold, U(T), a function of threshold T, with respect to the change in the value of the mask threshold T, or (dU(T)/dT), are measured. The correct, or best, value of the threshold occurs when ¦dP(T)/dT¦>/=0.5*¦dU(T)/dT¦.
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