Noise-reducing filter apparatus for decoded digital video signal

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358 36, H04N 5210, H04N 5213

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active

052413870

ABSTRACT:
An encoding noise reduction filter is described which is applicable to a decoded video signal produced from a digital video signal encoding and decoding apparatus of a type in which variable values of quantization step size are utilized within each video signal frame and in which orthogonal transform coefficients for respective picture element values are quantized and encoded. Low-amplitude high-frequency components of the decoded video signal are eliminated to achieve encoding noise reduction, with high-frequency emphasis processing of the resultant signal then being applied, and with the operations for eliminating low-amplitude high-frequency components and executing high-frequency emphasis being respectively controlled in accordance with the picture quality of the frame that is currently being processed, as expressed by an average value of quantization step size that was used in encoding processing of the frame.

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