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Fast DCT Domain Filtering Using the DCT and the DST

Kresch, Renato; Merhav, Neri

HPL-95-140

Keyword(s): : DCT-domain filtering, discrete sine transform, data compression


Abstract: The use of the discrete sine transform (DST), together with the discrete cosine transform (DCT), for processing of compressed digital video and images, is introduced. Using this approach, a method for efficient spatial domain filtering, directly in the DCT-domain, is developed and proposed. It is demonstrated that, in typical applications, the proposed algorithm is significantly more efficient than the conventional spatial domain method, and a recently-proposed advanced method. It assumes a separable kernel, but no symmetry is required. The method is applicable to any DCT based data compression standard, such as JPEG, MPEG, and H.261.

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