Development of an Augmented Reality system using ARToolKit

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Development of an Augmented Reality system using ARToolKit and user invisible markers PixeLINK PL-A544 FireWire Video Converter This FireWire converter accepts as input signal either RS-170 PAL or RS-170 NTSC. The device outputs a 6pin FireWire signal. It has drivers that are DirectShow® compliant. It supports a maximum frame rate of 30fps. Also three different video standards are supported; 640x480, 320x240 and 160x120. There are four packages that can be bought. It suffices to have the Starter’s kit. It includes a FireWire cable, a desktop adapter card and the PL-A544 itself. This package carries a price of €535 at http://bfoptilas.com. The product itself is displayed in Figure 4.18, together with its computer requirements in Figure 4.19. As was the case with before mentioned system requirements these also will not give rise to problems. Figure 4.18 PL-A544 Figure 4.19 Requirements 4.3.2.3 Frame grabber Requirements • Pentium III microprocessor, 450Mhz • 128 Mbytes RAM • DirectX 8.1 or greater • Pentium III 1.0 GHz or faster • 128 MB of Free Memory Video card with at least 4MB Video RAM, minimum 800x600 resolution at 24-bit or 32-bit True Color • A FireWire cable • An OHCI FireWire connection In theory it should be possible to connect a camera through a frame grabber to a computer to work with ARToolKit. Therefore it is needed that the frame grabber is DirectShow® compatible. One needs to be careful that no frames are lost during grabbing. Now will be described one such frame grabber, Matrox Meteor II, http://www.matrox.com/imaging/products/meteor2/home.cfm. The frame grabber needs a PCI bus slot. It captures from different video sources, among which RS-170. Acquired images can be transferred in real time to either system memory or display memory. It is unnecessary to mention system requirements, because the frame grabber has been used in practice before, which shows that these requirements are met. The Matrox Meteor II frame grabber is displayed in Figure 4.20. Figure 4.20 Matrox Meteor II frame grabber 45
Development of an Augmented Reality system using ARToolKit and user invisible markers Hauppage WinTV-PVR There has been an example of an AR application for museum artefact visualization that used ARToolKit together with a Hauppage WinTV-PVR video capture card [8]. This shows that there exists a possibility to have a frame grabber and ARToolKit work together. From the source it is not completely clear which type of frame grabber was used. There are several available. Here will be described the oldest model, WinTV- PVR350 because it will have lower price, but offers the same basic functionality. The frame grabber is delivered as a PCI card. Captured video can be stored on hard disk or sent to a monitor in real time. Input to the frame grabber is either NTSC or PAL. Using NTSC display rate is 30fps, Full D1: 720x480, MPEG1: 352x240. In Figure 4.21 and Figure 4.22 are displayed the frame grabber itself and its system requirements. Again these are not expected to give problems. The frame grabber is available at http://www.mini-itx.com. The total price is €215,67, including tax and shipping costs. Requirements • Pentium III 730MHz or faster • Windows XP/2000 • Free PCI slot Figure 4.21 WinTV-PVR350 Figure 4.22 Requirements 4.4 Firewire board camera The hardware components described before are all meant to provide a solution in cooperation with the described IR bullet cameras, which have a permanent IR filter installed. There also exists a second possibility that implicitly make use of the described IR filters. This manner will be more extensive and there exists more uncertainty about successful results. What needs to be done is that a camera manually is taken apart, the IR blocking filter is removed and that the IR filter is installed. But several problems may arise; the camera may be damaged, the IR filter may not fit or the images may not be of good quality. The process of removal the IR blocking filter can be tried with any camera, but again the weight of the camera should not be too high. Therefore first has been tried to find suitable cameras. These cameras are of type board level camera. Two of such cameras are described now. The model that is described first is the Dragonfly, delivered by Point Grey Research, http://www.ptgrey.com. The camera is delivered with a 1/3” Sony CCD image sensor; it has dimensions of 2.5”x2.0 inches, or 63.5x50.8mm. Different options are available for the resolution, either 640x480 or 1024x768. Also Colour or Black and White can be chosen for. The 640x480 version can deliver a frame rate up to 30fps. The camera has an IEEE 1394 interface. Together with the camera are delivered a 6pin IEEE 1394 cable and an IEEE 1394 PCI interface card. This constitutes all for having the camera 46
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Development of an Augmented Reality system using ARToolKit

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