Illumination: 10W LED Brightfield/Darkfield reflected illuminator, electronic variable aperture and field diaphragm, center adjustable; Brightfield/Darkfield selector; slots for filters and polarizing kit. Filters & Attachments: Polarizing kit, Interference filters, DIC prism, IF550 Yellow Interference Filter for Photoresist inspection. Stage Micrometer: NIST certified stage micrometer with 2 separate scales - 1mm divided into 100 divisions and 10mm divided into 100 divisions. Camera & Software: System includes the PAXcam X5, 5 megapixle color camera with recommended c-mount adapter and PAX-it! Basic Measurement, PAX-it! Image Analysis, and PAX-it! Critical Dimensions modules. Imaging computer with i5 processor, 32GB / 512GB and 2 hours of online training sessions. Size: 683mm (26.89") D x 519mm (20.43") H x 539mm (21.22") W

infrared-transparent materials chart

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

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

IRtransparent materials

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.

This Fein Optic M68 critical dimension semiconductor microscope system has been designed for measurement of critical dimensions of semiconductors. The microscope system includes a PAXcam X5 camera equipped with PAX-it! Basic Measurement, PAX-it! Image Analysis, and PAX-it! Critical Dimensions software modules. Providing observation in brightfield, darkfield, polarization, and DIC methods, outstanding optical performance and crisp images, which generate reliable and reproducible results. The M68 supports up to a 200mm diameter wafer and 11 inches / 279.4mm of FPD (Flat Panel Display). Please contact Microscope World for a quote or further information.

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

IR reflectivetape

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.

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

IRabsorbingmaterial

Infraredreflectivecoating

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.

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

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:

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