improved field - of - illumination and field - of - view matching for 3d time - of - flight cameras is provided using light emitters with rectangular reflectors . a better adjustment of the foi with the camera &# 39 ; s fov has the following advantages : optimal use of emitted light and reduced multi - path problems . furthermore , embodiments bring the benefit for rather low - cost customization of the illumination to match the foi to the specified fov .