Description: A new target recognition method was proposed to improve the rotation invariancc and reduce the
matching frequency for nu“mum absolute difference．The rrIatching furlction was the weighted sumof pIx—
els difference in sub—windows． The subwindaws were ring-shaped，which made the algorithm have the
property of rotation invariance． Feature points matching between trac ki“g window and template could be
completed according to the matching functiom(bmpare to conventional algorithm，the matching frequency
is reduced The Iost feature points in tracking window could be determined according to the positions of
the feature points nlatched．Simulation results prove the validity of the method．
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