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Summary: M.I.T Media Laboratory Perceptual Computing Section Technical Report No. 279 Replaces TR-228
Appears in the IEEE Transactions on Image Processing Special Issue: Image Sequence Compression,
vol 3, no. 5, p. 625-638, September 1994. Revised: May, 1994
Representing Moving Images with Layers
John Y. A. Wang AND Edward H. Adelson
Abstract
We describe a system for representing moving
images with sets of overlapping layers. Each
layer contains an intensity map that de nes the
additive values of each pixel, along with an alpha
map that serves as a mask indicating the trans-
parency. The layers are ordered in depth and
they occlude each other in accord with the rules
of compositing. Velocity maps de ne how the
layers are to be warped over time. The layered
representation is more
exible than standard im-
age transforms and can capture many important
properties of natural image sequences. We de-
scribe some methods for decomposing image se-
quences into layers using motion analysis, and we
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