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For accurate,SconvenientSmeasurementSof tank gun’sSmovement parameters,Sa test system based onSvision detection technology is proposed.SFirstly,StheSplane calibration method is introduced forSsystem imagingSmodel. Secondly,Sbased on theSiterative optimization, dynamic thresholdSis adopted for image segmentation; theSleast square method for circleSfitting;Sthe geometrical characteristicsSof spot for determining whether the spot is effective; and then theSbestSlocalization result is obtained with iteration method.SFinally, theSmotion parameters of tankSgun are achieved with the runtime and distance on the projectionStarget.SThe experimental results show that,Sthe systemScan adapt to complexSlight environments,Smeet theSrequirements of accuracy,Srepeatability,Sconvenience.