Multispectral data compression using inter-band prediction
AssigneeComsat Corporation
InventorAshok K. Rao
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Abstract
A method for compressing a multi-spectral data stream corresponding to an image for a selected one of transmission, as a limited bandwidth transmission using a predetermined band, and data storage includes steps for dividing the image into pixel blocks P in each of N bands, where both P and N are integers greater than one, selecting one of pixel blocks in one of N bands as an anchor band and computing prediction coefficients for relating intensities of each pixel in each P pixel block in the remaining N-1 bands based on the anchor band. A codec apparatus is also described.
Claims10
A method of compressing a multi-spectral data stream corresponding to an image for a selected one of transmission, as a limited bandwidth transmission using a predetermined band, and data storage, said method comprising the steps of:
- (a) dividing said image into a plurality of pixel blocks P in each of a plurality of N bands, where both P and N are integers greater than one;
- (b) selecting one of said N bands as an anchor band;
- and
- (c) computing prediction coefficients for relating intensities of each respective pixel in each of said P pixel blocks in each remaining one of N-1 bands to corresponding pixel in said anchor band.
A multi-spectral compression system for compressing a data stream corresponding to an image for transmission using a predetermined band, said data stream being arranged into P pixel blocks in each of N bands to thereby form P .times.N data blocks, wherein P and N are integers greater than 1 and wherein one of said N bands is selected as an anchor band, comprising:
- a computer for computing prediction coefficients for each of said P pixel blocks in each one of remaining N-1 bands;
- and
- a multiplexer for mixing a portion of said data stream corresponding to said anchor band with respective said prediction coefficients of said remaining N-1 bands, thereby producing a multi-spectral compressed signal.
A multi-spectral transmission system for compressing a data stream corresponding to an image for transmission on a predetermined band, said data stream being arranged into P pixel blocks in each of N bands to thereby form P.times.N data blocks, wherein P and N are integers greater than 1 and wherein one of said N bands is selected as an anchor band, said system comprising:
- a transmitter including:
- a first computer for computing prediction coefficients for each of said P pixel blocks in each one of remaining N-1 bands;
- and
- a multiplexer for mixing a portion of said data stream corresponding to said anchor band with respective said prediction coefficients of said remaining N-1 bands;
- and
- a receiver including:
- a demultiplexer for generating a plurality of band signals corresponding to said N bands, said band signals comprising a recovered anchor band and a plurality of recovered prediction coefficients;
- and
- a second computer for computing signal content of each of recovered remaining N-1 bands based on respective recovered prediction coefficients and said recovered anchor band.
Dependencies are inferred from the claim text.