Images are selectively captured and transmitted by 3D security cameras to avoid congestion of a network coupling them to a central server. Skeleton detection circuits enable conditional event capture when triggered. Head, hands, and feet are associated with pixel blocks. An artificial horizon is derived from a shoulder segment. An isometric floor perspective is derived from a series of foot positions. Orientation of feet, head, or hands relative to an artificial horizon triggers event capture and transmission. Simultaneous position of two feet above the floor perspective triggers event capture and transmission. Images are transformed to effectively alert a user.