Thispaperpresentstwosetsoffeatures,shaperepresentationandkinematicstructure,forhuman activityrecognitionusingasequenceofRGB-Dimages.Theshapefeaturesareextractedusingthedepth informationinthefrequencydomainviasphericalharmonicsrepresentation.Theotherfeaturesinclude themotionofthe3Djointpositions(