Processing system with delta-based video data encoding
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United States of America Patent
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Aug 11, 1998
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app pub date -
Oct 11, 1996
filing date -
Oct 11, 1996
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Abstract
A method and apparatus for differential video data encoding which utilizes a reduced number of bits per pixel to encode chroma and luma components of a video data stream. A 4-bit absolute code is determined for a given 8-bit luma or chroma component in the data stream. The determined absolute code is indicative of a particular one of a plurality of ranges into which the given component falls. The given component is encoded using the determined absolute code if the absolute code produces a lower encoding error than a 4-bit delta code which encodes the component as a difference relative to a previously-encoded component. If the delta code produces a lower encoding error than the determined absolute code, the given component is encoded using the delta code. In a situation in which the given component is the first component of its type on a line of video, an absolute code may be used regardless of whether or not the absolute code produces a higher encoding error than the delta code.
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