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25 January 2011 Acceleration of the Retinex algorithm for image restoration by GPGPU/CUDA
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Retinex is an image restoration method that can restore the image's original appearance. The Retinex algorithm utilizes a Gaussian blur convolution with large kernel size to compute the center/surround information. Then a log-domain processing between the original image and the center/surround information is performed pixel-wise. The final step of the Retinex algorithm is to normalize the results of log-domain processing to an appropriate dynamic range. This paper presents a GPURetinex algorithm, which is a data parallel algorithm devised by parallelizing the Retinex based on GPGPU/CUDA. The GPURetinex algorithm exploits GPGPU's massively parallel architecture and hierarchical memory to improve efficiency. The GPURetinex algorithm is a parallel method with hierarchical threads and data distribution. The GPURetinex algorithm is designed and developed optimized parallel implementation by taking full advantage of the properties of the GPGPU/CUDA computing. In our experiments, the GT200 GPU and CUDA 3.0 are employed. The experimental results show that the GPURetinex can gain 30 times speedup compared with CPU-based implementation on the images with 2048 x 2048 resolution. Our experimental results indicate that using CUDA can achieve acceleration to gain real-time performance.
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Yuan-Kai Wang and Wen-Bin Huang "Acceleration of the Retinex algorithm for image restoration by GPGPU/CUDA", Proc. SPIE 7872, Parallel Processing for Imaging Applications, 78720E (25 January 2011);

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