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基于MPI-CUDA的K-T算法太阳高分辨图像重建

High Resolution Solar Image Reconstruction with K-T Algorithm Based on MPI-CUDA

  • 摘要: 大气湍流导致地基望远镜成像模糊,高分辨图像重建是解决这一问题的有效方法,K-T高分辨图像重建方法是其中常用的一种,但存在数据大、计算复杂等因素的制约,导致重建非常耗时。针对当前中央处理器与图形处理器混合架构下的高分辨图像重建开展研究,采用MPI-CUDA混合并行技术,最终实现了一套在单机图形处理器环境下基于斑点图像重建技术的高分辨太阳图像重建系统。通过实验验证,与单一的信息传递接口并行相比,图像子块的处理速度有了显著提升,在8个子进程下整个流程的加速比达到了2。实验结果表明,MPI-CUDA混合并行的有效性,能够为天文研究中的大规模计算任务提供借鉴和参考。

     

    Abstract: Atmospheric turbulence causes ground-based telescope imaging blur, the K-T high spatial image reconstruction algorithm is an effective way to solve this problem and the speckle imaging technique is acommon one. However, some factors such as large data and complex calculation, cause the reconstruction to be time-consuming. In this paper, we focus on the research of high spatial image reconstruction under the CPU and GPU hybrid architecture. By using MPI-CUDA hybrid parallel technology. we implement a high spatial resolution solar image reconstruction system based on speckle imaging techniques in stand-alone GPU environment. The experimental result shows that the processing speed of image sub-block has been improved significantly compared with the one only using MPI parallel, and the acceleration ratio of the whole process has reached 2 with 8 sub-processes. The experimental results show that the effectiveness of MPI-CUDA hybrid parallel can provide a good reference for large-scale computing tasks in astronomical research.

     

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