Sub-band coding of images with low computational complexity
First Claim
1. A method for coding video signals comprising the steps ofdividing said video signal into a plurality of sub-band signals by applying said video signal to a first plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are in the form of an integer divided by a power of two, andreconstructing said video signal by applying said sub-band signals to a second plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are of the form of an integer divided by a power of two.
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Abstract
A class of filters for use in connection with the sub-band coding of a video signal is disclosed. The filters are of short length, symmetric and have coefficients in the form of an integer divided by a power of two. The filters may be implemented with a minimum of circuitry and permit exact reconstruction of a sub-band coded video signal.
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Citations
8 Claims
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1. A method for coding video signals comprising the steps of
dividing said video signal into a plurality of sub-band signals by applying said video signal to a first plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are in the form of an integer divided by a power of two, and reconstructing said video signal by applying said sub-band signals to a second plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are of the form of an integer divided by a power of two.
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6. A device for coding a video signal comprising
at least one bank of filters for receiving said video signal and for analyzing said video signal into a plurality of sub-band signals, each of said filters being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two, means for decimating said sub-band signals, and means for separatley coding each of said sub-band signals.
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8. A sub-band coding system for a video signal comprising
a first filter bank for analyzing said video signal into a plurality of sub-band signals, each of said filters in said first bank being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two, and a second filter bank for synthesizing said video signal from said sub-band signals, each of said filters in said second bank being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two.
Specification