An integrated vision-based input and display system comprising: a display-image forming layer configured to transmit a display image for viewing through a display surface; a wedge shaped imaging optic having substantially planar and opposing upper and lower faces, which define a wedge angle of one degree or less, wherein the lower face of the imaging optic comprises a turning film configured to turn reflected infrared light from one or more objects arranged on or near the display surface towards a curved edge face of the imaging optic and the curved edge face is configured to focus and reflect the reflected light toward an imaging detector, wherein the imaging optic inherently limits the acceptance cone of light coupled in the imaging optic from the upper face to a range of angles of ± 3 degrees, wherein the imaging optic is further configured to map a position space at the acceptance window of the imaging optic to an angle space at the exit window of the imaging optic so that the display surface may be imaged onto the imaging detector; the imaging detector configured to image the infrared light of a narrow range of angles relative to the display surface normal by an aperture that is configured to admit the reflected light from the imaging optic from within an angularly restricted field of view of the imaging detector; a vision-system emitter configured to emit the infrared light, for illuminating the one or more objects; and a visible- and infrared-transmissive light guide having opposing faces, opposing first and second edge faces, and a diffusive layer arranged on one of the opposing faces of or within the light guide and parallel to the opposing faces, wherein the light guide is configured to receive the infrared light from the vision-system emitter, to conduct the infrared light from the first edge face toward the second edge face via total internal reflection from at least one of the opposing faces, and by frustration of the total internal reflection by the diffusive layer, to project the infrared light onto the one or more objects. a display-image forming layer configured to transmit a display image for viewing through a display surface; a wedge shaped imaging optic having substantially planar and opposing upper and lower faces, which define a wedge angle of one degree or less, wherein the lower face of the imaging optic comprises a turning film configured to turn reflected infrared light from one or more objects arranged on or near the display surface towards a curved edge face of the imaging optic and the curved edge face is configured to focus and reflect the reflected light toward an imaging detector, wherein the imaging optic inherently limits the acceptance cone of light coupled in the imaging optic from the upper face to a range of angles of ± 3 degrees, wherein the imaging optic is further configured to map a position space at the acceptance window of the imaging optic to an angle space at the exit window of the imaging optic so that the display surface may be imaged onto the imaging detector; the imaging detector configured to image the infrared light of a narrow range of angles relative to the display surface normal by an aperture that is configured to admit the reflected light from the imaging optic from within an angularly restricted field of view of the imaging detector; a vision-system emitter configured to emit the infrared light, for illuminating the one or more objects; and a visible- and infrared-transmissive light guide having opposing faces, opposing first and second edge faces, and a diffusive layer arranged on one of the opposing faces of or within the light guide and parallel to the opposing faces, wherein the light guide is configured to receive the infrared light from the vision-system emitter, to conduct the infrared light from the first edge face toward the second edge face via total internal reflection from at least one of the opposing faces, and by frustration of the total internal reflection by the diffusive layer, to project the infrared light onto the one or more objects.