SPIE-The international Society for Optical Enging SPIE-the International Society for Optical Enging SPIE-the international society for optical engineering SPIE-the international Society for optical engineering SPIE-the international society for Optical engineering SPIE_the international Society for optical engineering SPIE-the international society for optial engineering SPIE-the International Society for optical engineering SPIE-the International Society for Optical Engineering SPIE-The international Society for Optical Engineering