Accelerating Discrete Wavelet Transforms on Parallel Architectures

David Barina, Michal Kula, Michal Matysek, Pavel Zemcik
Centre of Excellence IT4Innovations, Faculty of Information Technology, Brno University of Technology, Bozetechova 1/2, Brno, Czech Republic
arXiv:1704.08657 [cs.PF], (27 Apr 2017)


   title={Accelerating Discrete Wavelet Transforms on Parallel Architectures},

   author={Barina, David and Kula, Michal and Matysek, Michal and Zemcik, Pavel},






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The 2-D discrete wavelet transform (DWT) can be found in the heart of many image-processing algorithms. Until recently, several studies have compared the performance of such transform on various shared-memory parallel architectures, especially on graphics processing units (GPUs). All these studies, however, considered only separable calculation schemes. We show that corresponding separable parts can be merged into non-separable units, which halves the number of steps. In addition, we introduce an optional optimization approach leading to a reduction in the number of arithmetic operations. The discussed schemes were adapted on the OpenCL framework and pixel shaders, and then evaluated using GPUs of two biggest vendors. We demonstrate the performance of the proposed non-separable methods by comparison with existing separable schemes. The non-separable schemes outperform their separable counterparts on numerous setups, especially considering the pixel shaders.
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