@class VNImageSignature, LKTOpticalFlow; @interface VNOpticalFlowObservation : VNPixelBufferObservation @property (retain, nonatomic) VNImageSignature *targetImageSignature; @property (retain, nonatomic) LKTOpticalFlow *opticalFlow; + (id)defaultOriginatingRequestClassNameForRequestRevision:(unsigned long long)a0; - (void).cxx_destruct; @end