The aim of this paper is to propose the 2-D DWT architecture. The Discrete Wavelet (DWT) is a multiresolution analysis tool with excellent architecture in the time and frequency domains. Previous DWT architectures are mostly based on the modified lifting scheme or the flipping structure. In order to achieve a critical path with only one multiplier, at least four pipelining stages are required for one lifting step, or a large temporal buffer is needed. In this brief, modifications are made to the lifting scheme, and the intermediate results are recombined and stored to reduce the number of pipelining stages. As a result, the number of registers can be reduced to 18 without extending the critical path. In addition, the two-input/two-output parallel scanning architecture is adopted in our design. For a 2-D DWT with the size of N × N, the proposed architecture only requires three registers between the row and column filters as the transposing buffer, and a higher efficiency can be achieved. The implemented architecture represents the simulations in Xilinx for 1-D DWT and 2-D DWT outputs.
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