Any advise would be very helpful, since I always end up with medical equipment or some mystical healing stuff via google :D

beamsplitter中文

im working on a project using fiducial trackers. We are currently trying to avoid the markers to be backlit with LED’s. Ive modified a Logitech C920 into a infrared Camera.

Thorlabsbeam splitter

But as Meierhans suggested you can use “safety” reflective tapes and fabrics (a web search will turn up lots) that have very high gain for light near the viewer. You can use a ringlight, but I’ve found any IR source next to the camera works well unless the camera is very close to the object (the lens-to-light distance is a large fraction of the lens-to-object distance). The 3M brand name is “Scotchlite”, but there are many around. Here in the US every car parts store has reflective tapes, and the fabrics can be ordered online.

Tip: you can make almost invisible fiducials by using normal black paint (which is usually very IR reflective) and an IR absorbing black paint.

Using retroreflective paint and a ring of IR LED’s around your cam could save you from buying large IR sources to flood the whole room.

Beam splitter

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A beamsplitter is an optical component used to split a beam of incident light into two parts in a laser or illumination system. Cube beamsplitters consist of a pair of precision right-angle prisms carefully cemented or optically contacted together. The hypotenuse of one of the prisms is coated with polarizing or non-polarizing beamsplitter coating and four sides of the cube are AR coated to minimize surface reflection losses. Plate beamsplitters feature a coated front surface that determines the beamsplitting ratio, while the wedged back surface is AR coated to minimize ghosting. Dichroic beamsplitters are wavelength dependent and are used to combine or split laser beams in a variety of colors. Laser beam attenuators provide high resolution intensity control without introducing a gradient in the intensity distribution or a change in the beam propagation direction.

This would be a possibility to print or plot/cut the markers with this transparent layer over a highly infrared reflective surface/paint.

Polarizingbeam splitter

Tape would be the best solution for the marker situation, but im also very very interested in paint for further experiments :)

Almost all paints of all colors and even dyed fabrics reflect IR, the challenge is to find those that don’t for contrast.

Here’s a pic with an IR-modified PS3Eye where the dancers have the safety reflective fabric woven into their costumes, with a standard 100W tungsten clamp light (with RGB gels to block the visible light) next to the camera. Even with the stage being lit with tungsten stage lighting the fabric is such high gain it still reads easily:

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Fabric / Paper Based on this thread and my own little tests there are certain fabrics that seem to reflect more than others. https://discourse.vvvv.org/t/315