Virtual image registration in augmented display field

Details Virtual image registration in augmented display field Virtual image registration in augmented display field

2005-03-15

2005-03-15

Mengistu, Amare (Department: 2673)

Computer graphics processing and selective visual display system

Image superposition by optical means

Operator body-mounted heads-up display

C359S630000, C359S631000, C382S148000, C382S284000

Reexamination Certificate

active

06867753

ABSTRACT:
A virtual image is registered among a perceived real world background. Tracking light is scanned into the real world environment, which includes at least one detector pair. A first time and a second time at which the tracking light impinges on the first detector is detected, in which the first time and second time occurs within adjacent scan lines. A time at which a horizontal scan line edge (e.g., beginning of scan line or end of scan line) is encountered is derived as occurring one half way between the first time and the second time. The horizontal location of the first detector then is determined within a specific scan line inferring the scan line edge time. The vertical location of the detector is determined within a scan frame by measuring time duration using the beginning of the frame. By determining a location independently from the temporal resolution of the augmented imaging system, the temporal location of the detector is identified to a sub-pixel/sub-line precision. The augmented image is registered either to a 3D real world spatial coordinate system or to a time domain coordinate system based upon tracked position and orientation of the user.

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