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Approximate Convolution Using DCT Coefficient Multipliers

Merhav, Neri; Kresch, Renato


Keyword(s): : DCT-domain processing, filtering, convolution, image enhancement, quantization tables

Abstract: We develop a method for designing DCT coefficient multipliers in order to approximate the operation of 2D convolution of an image with a given kernel. The method is easy to implement on compressed formats of DCT-based compression methods (JPEG, MPEG, H.261) by applying decoding quantization tables that are inconsistent with the encoding quantization tables.

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