Reflective Model

IK2- figure 1

IK2- figure 2

The reflective model provides head tracking by reflecting the radiation emitted by the emitting IR diodes of the IR camera. As the figures show, this is achieved by gluing IR reflective tape over the relevant surfaces on the point model. The absence of the need to power up the model itself represents an obvious advantage when compared to point models fitted with emitting IR diodes, but the problems with filtering out the ambiental radiation and unwanted reflections will increase. Aside from providing adequate filtering on the IR camera itself, which includes removing the IR filter from the cam and providing a visible light filter for it, care needs to be taken about the place at which the computer and the IR camera are situated: so that daylight from the window doesn't reach the camera if reliable head tracking is wanted over the course of a whole day. Should the opposite be the case, daylight may help with reducing the time spent with a computer. Problems can also be caused by a lamp, glass door of a closet or a lady wearing shining jewellery behind the user's back. When the reflective point model is used, additional care should be taken with setting up the web cam software properly. Since different camera models yield good results with somewhat different settings, the reader's attention is hereby turned to the page on the Freetrack website which contains experiences different users had with their cameras. If someone should find it significant, camera with which point models offered on this website were tested performed well with gamma set to the maximum value with other settings around the middle with the visible light filter attached to the camera and with gamma, brightness and contrast set to minimum without the visible light filter present on the camera. Auto- expozition was turned off in both instances with the IR filter the camera shipped with removed. Setting the sensitivity threshold in Freetrack itself was the final step, with the extent this setting could take with all three tracking points reliably detected having been relatively small in both cases, which imposed the need to increase the sensitivity settings in Freetrack. With every limitation mentioned, the reflective point model can provide for reliable head tracking even when it's used for the purpose of simulating flight, while the demands will probably not be as high when it's used for other purposes.
Dimensions of the reflective point model, meaning distances between tracking points, are similar to those on the battery charged model, which means that using the model at distances of one meter from the cam or greater is recommended. It's fastened to the hat by a tin band visible on figure 2.

IK2- figure 3

IK2- figure 4

Preset configuration files are available for download below. Content of the archives meant for FreeTrack is to be coppied into the Freetrack installation directory and the existing files are to be overwritten if the model is to be used with this program. These files configure Freetrack with the web cam set to 320x240 resolution, while using other resolutions will take additional tweaking of the response curves. There's also a LinuxTrack .profile file available for download which configures LinuxTrack with LinuxTrack pipe as interface for use with this model. Unzip the archive to a location on a local hard drive and use the "Import profile" button of the "Tracking setup" panel of LinuxTrack's graphical user interface. Camera resolution was set to 320x240 and using other resolutions will take aditional tweaking.
This point model is priced 5E. Order the model.

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