A FAST PIPELINED IMPLEMENTATION OF TWO DIMENSIONAL INVERSE DISCRETE COSINE TRANSFORMS
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17-09-2009, 09:55 PM


A FAST PIPELINED IMPLEMENTATION OF TWO DIMENSIONAL INVERSE DISCRETE COSINE TRANSFORMS

Abstract:- The inverse discrete cosine transform (IDCT) is a significant component in todayâ„¢s JPEG and MPEG decoders. Of all the stages in the decoding process of a JPEG file, the IDCT is the most computationally intensive. Hence, we require fast and efficient implementations, either in software or hardware. Numerous individual designs for computing the ID-IDCT have been proposed. Our 2D-IDCT incorporates two of our ID-IDCT cores and a transpose network to provide a stall-free pipeline. In this paper, we describe a fast hardware implementation of a two-dimensional IDCT architecture that implements a variation of the modified Loeffler algorithm. This design is currently functionally verified, synthesized and tested on the Xilinx Virtex II FPGA. Our FPGA implementation has a throughput of over 800 M coefficients per second, implemented as an eight-wide pipeline with a clock frequency of 102 MHz.
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