Noise reduction apparatus

Abstract

Noise reduction apparatus comprising, encoder, having a memory for storing picture data of a different picture that was formed from a current picture and a reference picture and a motion detector for detecting the motion between the current picture and the reference picture on block by block basis, for encoding the current picture data or for predictive-encoding the inter-pixel difference between blocks of the current picture data and the reference picture data blocked based on the results of the motion detection, a correlation calculator for calculating at least an additional correlation between a first correlation and a second correlation. The first correlation is between a block-of-interest in the current picture used for the predictive encoding and the reference picture block. The second correlation is between blocks on the periphery of the block-of-interest and the reference picture block, a coefficient calculator for generating a noise coefficient for reducing the noise based on at least the second correlation between the first and second correlations, a noise extractor for extracting the noise component based on the inter-pixel difference between the current picture data and the reference picture data, and the noise coefficient, and subtractor for subtracting the noise component from the input picture data so as to cancel the noise.

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