"Photographs." . . "Imaging techniques." . . . . "Engineers United States California Interviews." . . "Dr. Robert Nathan describes his research and development work using digital filters to remove distortions from Ranger spacecraft photographic data, and the ways in which he applied photo enhancement techniques. He goes on to discuss the transfer of space photographic imaging techniques to the field of biomedical image processing." . . . . . . . . . . . "History" . . . . . . . . "Interview with Robert Nathan" . . . . . . . . "Interviews" . . . . . . . . "Ranger lunar probes." . . "Digital filters." . . "Electron microscopy." . . "Ranger 7 lunar probe." . .