Development of an Augmented Reality system using ARToolKit

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Development of an Augmented Reality system using ARToolKit and user invisible markers Considering the foregoing it is recommended to apply the IR bullet camera for recognizing the ink. Second choice could be a board camera in conjunction with a custom made IR filter. The third possibility that exists is to have a board camera with a square IR filter. 5.3 Connection to computer If is chosen for the board camera, there is no necessity for deciding on a connection to a computer. Since the camera has an IEEE-1394 FireWire interface the type of connection is prescribed. However, the IR bullet camera can have three different types; USB, FireWire and frame grabber. USB and FireWire are favoured over a connection through a frame grabber. The first two are known to function with ARToolKit and are a “plug-and-play” solution, which makes it possible to connect them to any computer that has an USB or a FireWire port. This increases the possibilities to use the system on remote locations. When the third connection type is used these are narrowed because of the need for a frame grabber. For the purpose of this evaluation only USB2.0 and FireWire are taken into account, and they are considered equal. The option of a USB1.1 connection is discarded. Because of the equality, one can decide which to use by a price comparison. Then it shows that USB2.0 provides a cheaper connection, compared to FireWire. To summarize, there are three proposals for the hardware components for invisible marker tracking. These are depicted below, together with the total cost of these proposals. The numbering of the proposals indicates the favourability of the proposal. Proposal 1 Price Proposal 2 Price Proposal 3 Price Ink Pen $18,43 Ink Pen $18,43 Ink Pen $18,43 IR Bullet $99 FireFly2 board $299 FireFly2 board $299 camera camera camera Power Supply $15 CS-mount adapter $30 Square IR filter $35,50 USB 2.0 Video $59 Custom made Depends on filter Grabber IR filter characteristics Total price $191,43 Total price $347,43 + price of custom made filter 5.4 HMD Total price $352,93 For the choice of an HMD there are a number of options available, which are split up in 2 categories; video-see through and optical see-through. The video see-through variant is preferred over the optical see-through solution. The first video see-through solution describes the fully integrated HMD. At first this seems to be the best solution because it delivers just exactly what we are looking for. There is no necessity to make adaptations to the HMD; it can be used as it is delivered. The price may lower the attraction of this solution a bit, but will not cause major problems. The stereoscopic add-on for an HMD on its own does not only have an even higher price than the fully integrated HMD, but also may suffer from possible compatibility 59
Development of an Augmented Reality system using ARToolKit and user invisible markers issues. Also there are not many HMDs that could be chosen from. This almost leads to a situation in which there exists no other option than to use it in combination with the advised HMD. The accumulated price of the add-on and this HMD are the limiting factor. The third described video-see through solution has the most promising perspective out of the three. The bare HMD on its own carries the lowest price, which is a desirable fact. Adaptation of the HMD, of course also has its price. But besides this, the fact that the HMD is custom made gives the most possibilities to have it adapted to our wishes. The type of cameras to give it stereoscopic view can be chosen by us. Also the camera for detecting the ink is to be chosen by us. The company offers several custom made solutions, which have a different degree of completeness. The solution consisting of the HMD with the added camera for detecting the ink is favoured over the solution that just adds two cameras to the HMD. One can go one step further and acquire the complete all-in-one solution offered, but it is expected that this also can be achieved by us ourselves with little effort. To summarize, there are three proposals for the video see-through HMD. These are depicted below, together with the total cost of these proposals. The numbering of the proposals indicates the favourability of the proposal. Proposal 1 Price Proposal 2 Price Custom made video see-through HMD Total price - Fully integrated HMD Depends on chosen configuration Proposal 3 Price €7300 Advised HMD (nVisor SX HMD) $23,900 HMD add-on $8,900 Total price €7300 Total price $32,800 The first proposal can consist of several configurations. Also there exists an order of favourability between those possible configurations. These are depicted below. The numbering of the proposals indicates the favourability of the proposal Proposal 1 Price Proposal 2 Price stereoscopic HiRes-800PC camera for detecting invisible medium €3275 stereoscopic HiRes-800PC + + depends on camera for choice for detecting invisible proposal medium Computer with 2 video cards Proposal 3 Price €3275 stereoscopic HiRes-800PC depends on choice for proposal determined by company €3275 Total price > €3275 Total price > €3275 Total price €3275 For the optical see-through HMD there are just two possibilities. Out of these two the first described one, the LitEye-500, is preferred over the second. The high price of the nVision DataVisor HiRes is debet to this. When using the LitEye-500 one has to take into account that two of them are needed for creating stereoscopic vision, and that it may be cumbersome to put them in the right configuration. The two proposals are 60
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Development of an Augmented Reality system using ARToolKit

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