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．

feature points matching.pdf

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