Importance

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Abstract

A technique implicitly encodes shape information by using a chroma-key color. A frame including an object is received and a box bounding the object is created. The pixels in the bounding box outside the object are identified and replaced with a key color. The object is coded. A first bitstream is output that includes the coded data for the pixels in the bounding box, and a second bitstream is output that includes a node containing the key color and chroma-key thresholds for the object. In one embodiment, the node is a MaterialKey node. In a further embodiment, the node comprises a transparency field, an isKeyed field, an isRGB field, a keycolor field, a lowThreshold field, and a highThreshold field. A decoding system decodes the object and rectangular bounding box containing the object, and assigns a value signifying transparent to each pixel for which the difference between the color of each of said decoded pixels and the key color is below or equal to a low threshold, and assigns a value signifying opaque to each pixel for which said difference is greater than a high threshold.

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First Claim