Image orientation and animation using quaternions

Details Image orientation and animation using quaternions Image orientation and animation using quaternions

1986-11-19

1989-01-10

Harkcom, Gary V.

Boots, shoes, and leggings

340725, G06F 1566, G09G 116

Patent

active

047978368

ABSTRACT:
A method for orientating and animating video images using quaternions to provide smooth, predictable rotations in a digital video effect device. Euler angles for a new orientation are input by an operator and are converted into an appropriate quaternion. For incremental orientation changes the appropriate quaternion is combined with the current quaternion of the video image in either source or target space to form a new quaternion for the new orientation of the video image. A selected plurality of such new quaternions in a sequence make up the video effect keyframes. In executing the video effect a Bezier spherical linear algorithm is used to interpolate intermediate quaternions on a video field by field basis between neighboring pairs of keyframe quaternions based upon the source keyframe quaternion, the destination keyframe quaternion, a source outgoing keyframe quaternion, a destination incoming keyframe quaternion and an inbetweening time coefficient. The intermediate quaternions are fine tuned by referring to tension, continuity and bias parameters.

REFERENCES:
patent: 4092716 (1978-05-01), Berg et al.
patent: 4134681 (1979-01-01), Elmer
patent: 4600919 (1986-07-01), Stern
patent: 4620287 (1986-10-01), Yam
patent: 4625289 (1986-11-01), Rockwood
patent: 4631690 (1986-12-01), Corthout et al.

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