Multiple block-size transform video coding using an asymmetric sub-band structure
First Claim
Patent Images
1. A method of coding a video signal comprising the steps of:
- decomposing said video signal into a plurality of sub-band streams of samples by applying said video signal to an asymmetric multiple-stage structure of filter pairs, the filters in each stage being two-tap finite impulse response filters having equal magnitude coefficients which prouduce low-band and high-band output signals; and
separately coding each sub-band stream.
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Abstract
A sub-band coder for video signals is disclosed, which is easily realizable in VLSI due to its simple structure. The coder uses sets of two-tap finite impulse response (FIR) filters having equal-magnitude coefficients to decompose the video signal at multiple stages. In the preferred embodiment the sub-band coder has an asymmetrical structure. With the arrangement, the sub-band decomposition effects what is equivalent to a multiple block-size Hadamard transform of the video signal in which coefficients are transmitted from various block-sized transforms of larger blocks of pixel data.
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Citations
10 Claims
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1. A method of coding a video signal comprising the steps of:
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decomposing said video signal into a plurality of sub-band streams of samples by applying said video signal to an asymmetric multiple-stage structure of filter pairs, the filters in each stage being two-tap finite impulse response filters having equal magnitude coefficients which prouduce low-band and high-band output signals; and separately coding each sub-band stream. - View Dependent Claims (2, 3, 4)
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5. A sub-band coder for a video signal comprising:
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means for receiving said video signal, asymmetric multiple-stage filter means for decomposing said video signal into plural streams of sub-band samples, said asymmetric multiple-stage filter means comprising filter pairs at each stage, the filter pair at each stage being two-tap finite impulse response filters having equal magnitude coefficients which produce low-band and high-band signals; and plural coding means for separately coding each of said streams of sub-band signals. - View Dependent Claims (6, 7, 8)
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9. A sub-band coding system for a video signal comprising:
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at a transmitting end, asymmetric multiple-stage filter means for decomposing said video signal into plural streams of sub-band samples, said asymmetric multiple-stage filter means comprising filter pairs at each stage, the filter pair at each stage being two-tap finite impulse response filters having equal magnitude coefficients which produce low-band and high-band signals, plural coding means for separately coding each of said streams of sub-band signals, means for rearranging the separately coded sub-band streams into a single stream such that each of the plural coded streams is serially sequenced band-by-band in the single stream, and means for entropy coding the single stream for transmission; and at a receiving end, means for entropy decoding the received stream, means for forming plural received coded sub-band streams from the entropy decoded stream, plural decoding means for separately decoding each of said plural received coded sub-band streams, and asymmetric multiple-stage filter means for reconstructing said video signal from the plural decoded received sub-band streams, said asymmetric multiple-stage filter means comprising filter pairs at each stage, the filter pair at each stage being two-tap finite impulse response filters having equal magnitude coefficients which produce low-band and high-band signals.
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10. A method of transmitting video signals between a transmitting and receiving end comprising the steps of:
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at the transmitting end, decomposing said video signal into a plurality of sub-band streams of samples by applying said video signal to an asymmetric multiple-stage structure of filter pairs, the filters in each stage being two-tap finite impulse response filters having equal magnitude coefficients which produce low-band and high-band output signals, separately coding each sub-band stream, rearranging the separately coded sub-band streams into a single stream such that each of the coded sub-band streams is serially sequenced band-by-band in the single stream, and entropy coding the single stream for transmission; and at the receiver, entropy decoding the received stream, forming plural received coded sub-band streams from the entropy decoded stream, separately decoding each of the received coded sub-band streams, and reconstructing said video signal from the plural decoded received sub-band streams by applying said plural decoded sub-band streams to an asymmetric multiple-stage structure of filter pairs, the filters in each stage being two-tap finite impulse response filters having equal magnitude coefficients which produce low-band and high-band signals.
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Specification