R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-through hmd. In Proc. SIGGRAPH '94, pages 197--204, 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....to R VW = R VS R ST Ry TW (5) As a result, we have four unknown parameters: the triaxial rotation angles R VS ( VS , VS , VS ) and Ry TW ( TW ) 6.2. Sensor calibration using visual cues It is difficult to fine tune all unknown parameters manually and set them interactively. Azuma et al. [14] conducted a bore sight operation using visual cues to guide the viewpoint to a predetermined position, and calculated the eye to tracker transformation based on sensor output. Their case is different from ours in that the sensor used was a 6DOF, and the sensor output was already known based on ....

R. Azuma and G. Bishop, "Improving static and dynamic registration in a optical see-through HMD," Proc. SIGGRAPH'94, pp.197-204, 1994.

....In addition to the two aforementioned constellation type tracking systems, there has been much previous work on inertial and acoustic technologies. At least three authors have exploited the motion derivatives provided by inertial sensors to add prediction capability to HMD tracking systems [1][4] 15] In the navigation arena, the aided inertial navigation approach used in this paper has been well known, and a wide variety of radio frequency navigational aids have been used, including LORAN, OMEGA, radar, GLONASS, and GPS for maritime and aviation applications, as well as star trackers ....

R. Azuma and G. Bishop. Improving Static and Dynamic Registration in an Optical See-through HMD. In SIGGRAPH 94 Conference Proceedings, ACM Annual Conference Series, Orlando, FL, August 1994.

....an AR system must know very precisely where the user is and where he is looking. The virtual objects have to be rendered from the same perspective. In the past, various carefully calibrated sensing devices have been used for this purpose including magnetic trackers and active LED systems [1, 2, 6, 20]. But the precision and working range of such devices is insufficient for most AR applications. Research is now focussing on computer vision based methods. Currently, the most successful ones track optical markers in indoor demonstrations, using video input from a mobile camera to determine the ....

R. Azuma and G. Bishop. Improving Static and Dynamic Registration in an Optical See-through HMD. Proc. Siggraph'94, Orlando, July 1994, pp. 194-204.

....the real world. SAE and SVE are supplementary with each other, and these two types of workspaces should be chosen according to the task requirement. Within an SAE, remote collaboration is not available, which is one of the most significant advantages of an SVE, and precise calibration is required [1]. On the other hand, awareness information of other users is naturally transferred and real objects are available in collaboration within an SAE. Our goal is to support spatial collaboration as smooth as possible according to the task requirement. When face to face interaction are crucial to the ....

Azuma, R. and Bishop, G., "Improving Static and Dynamic Registration in an Optical See-through HMD," Proc. ACM SIGGRAPH '94, pp. 197-204, 1994.

....and orientation components. A significant body of research is available for processing position data, but research on orientation data has recently been emerging. In particular, we note the efforts to generalize conventional signal processing and geometric techniques to manipulate orientation data [1], 2] 3] 5] 9] 10] 15] 16] 17] 18] 22] 24] 25] 26] LTI (Linear Time Invariant) filtering, which is equivalent to convolution filtering, is a fundamental technique in modern signal processing and has been used over a wide range of signal processing applications that ....

....under addition and scalar multiplication, the weighted sum of unit quaternion points is generally not a quaternion of unit length. One popular approach is to apply a mask to each component of unit quaternions separately and then to re normalize the filter response to guarantee the unit magnitude [1]; however, re normalization can incur side effects such as singularity and unexpected distortion as discussed in Section VII A. Several methods employing exponential and logarithmic maps have been introduced to avoid re normalization. One is to transform quaternion points to the tangent space ....

R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-through HMD. Computer Graphics (Proceedings of SIGGRAPH 94), 28:197--204, July 1994.

....contribute around 2 frames. Rather than go back to the case of not moving the object (static shader lamps) or moving it in a restricted manner (as in bolting it to a turntable or a mechanical arm) to reduce latency, the preferred solution is to fine tune the tracking code and add prediction [2] to it to offset most of the effects of latency. Tracker Range: The Flashpoint optical tracker s sensors can track only in a restricted set of orientations, when all two or three LEDs on the sensor are visible to the infra red detector. This limitation can be addressed by building a custom ....

R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-Through HMD. In SIGGRAPH 94, pages 197--204, July 1994.

....manual alignment of the model with the video image and in some cases requires markers to appear in both the MR image and video image. An optical tracker has also been proposed by a group at the University of North Carolina [ Wang et al. 1990, Ward et al. 1992, Gottschalk and Hughes, 1993, Azuma and Biship, 1994 ] This method is essentially another active sensor not unlike a laser scanner. It uses a sea of lights consisting of nearly 1000 LED s mounted in the ceiling tiles of 10 by 12 room. Three cameras mounted on an HMD are aimed at the ceiling while the LED s are flashed sequentially. This ....

Ronald Azuma and Gary Biship. Improving static and dynamic registration in an optical see-through HMD. In Computer Graphics, pages 197--204. ACM SIGGRAPH, July 1994. Orlando, Fl.

....the user s visual sense tends to override the conflicting signals from his or her vestibular and proprioceptive systems. However, in see through AR or SAR, preserving the illusion that virtual and real objects coexist requires proper alignment and registration of virtual objects to real objects [Azuma94]. Traditional AR methods use body centric coordinate system to render synthetic objects and SAR methods use a fixed world coordinate system to render them. However, in both, the registration errors are caused by a number of factors such as system delay, optical distortion and tracker measurement ....

Azuma, R., Bishop, G. Improving Static and Dynamic Registration in an Optical See-through HMD. Proceedings of SIGGRAPH 94 (Orlando, Florida, July 24-29, 1994). In Computer Graphics Proceedings, Annual Conference Series, 1994, ACM SIGGRAPH, pp. 197-204.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-through hmd. In Proc. SIGGRAPH '94, pages 197--204, 1994.

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Azuma, R., & Bishop, G. (1994). Improving static and dynamic registration in an optical see-through HMD. Computer Graphics, 197.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see through HMD.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-through hmd. In Proc. SIGGRAPH '94, pages 197--204, 1994.

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Azuma, R. and G. Bishop. "Improving static and dynamic registration in an optical see-through HMD," Proceedings of SIGGRAPH 94, 1994, pp. 197204.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-through HMD. In Proc. Siggraph '94, pages 194 -- 204, Orlando, July 1994.

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R. Azuma and G. Bishop, "Improving Static and Dynamic Registration in an Optical See-through HMD", Proc. SIGGRAPH 95, 1995.

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R. Azuma and G. Bishop. Improving Static and Dynamic Registration in an Optical See-Through HMD. In Proceedings ACM SIGGRAPH, pages 197--204, Orlando, Florida, July 1994.

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R. Azuma, G. Bishop. Improving static and dynamic registration in optical see-through hmd. In Proceedings of SIGGRAPH '94, pages 197--204, July 1994.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-through HMD. In Computer Graphics (Proc. ACM SIGGRAPH '94), Annual Conference Series, pages 197--204, Aug. 1994.

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R. Azuma and G. Bishop, "Improving Static and Dynamic Registration in an Optical See-through HMD," SIGGRAPH'94 Conference Proceedings, pp. 197-204, 1994.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see-through HMD. In Proc. Siggraph'94, pages 197--204, Orlando, FL, July 1994. ACM.

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R. Azuma and G. Bishop. Improving Static and Dynamic Registration in an Optical See-through HMD. Proc. Siggraph'94, Orlando, FL, July 1994, pp. 194-204.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical seethrough display. Computer Graphics, pages 194--204, July 1994.

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R. Azuma and G. Bishop. Improving Static and Dynamic Registration in an Optical See-Through HMD. In Proceedings ACM SIGGRAPH, pages 197--204, Orlando, Florida, July 1994.

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R. Azuma and G. Bishop. Improving static and dynamic registration in an optical see through HMD. 28:197--204, 1994. 3, 4

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Azuma, R. and Bishop, G. (1994) "Improving Static and Dynamic Registration in an Optical See-through HMD" In Computer Graphics Proc. ACM SIGGRAPH '94, pp 197-204.

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