基于迭代-帧间双预测的CUP-VISAR重构方法

CUP-VISAR image reconstruction based on iterative-interframe double prediction

  • 摘要: CUP-VISAR系统是将超快压缩成像(CUP)与二维任意反射面速度干涉仪(VISAR)结合的新技术。针对CUP-VISAR系统在含有大噪声情况下图像重构质量明显下降的问题,提出了一种基于迭代-帧间双预测的压缩超快摄影重构方法。对帧间图像数据的相关性及同一帧图像前后迭代的关联性进行研究,将压缩图像重构问题表述为一个基于卡尔曼预测和帧间预测的迭代-帧间双预测优化问题,并使用即插即用广义交替投影(PnP-GAP)框架来有效解决优化问题。仿真实验表明,在大高斯噪声条件下,所提方法的最小峰值信噪比(PSNR)提高了3.18~2.11 dB,最小结构相似性(SSIM)提高了20.30%~8.22%。实际结果表明,所提方法得到的条纹图像清晰度更高,重构的线-VISAR(1D-VISAR)条纹移动趋势更清晰,验证了算法的有效性。

     

    Abstract: CUP-VISAR system is a new technology that combines Compressed Ultrafast Photography (CUP) with two-dimensional Velocity Interferometer System for Any Reflector (VISAR). To solve the problem that the image reconstruction quality of CUP-VISAR system decreases obviously under the condition of large noise, a compressed ultrafast photography reconstruction method based on iteration-interframe dual prediction is proposed. Using this method, the correlation of inter-frame image data and the correlation of iterations before and after the same frame image are studied. The compressed image reconstruction problem is presented as an iteration-inter frame dual prediction optimization problem based on Kalman prediction and inter-frame prediction, and the Plug-and-Play Generalized Alternating Projection (PnP-GAP) framework is used to solve the optimization problem effectively. Simulation results show that the minimum Peak Signal-to-Noise Ratio (PSNR) and minimum Structure Similarity Index Measure (SSIM) of the proposed method are increased by 3.18−2.11 dB and 20.30%−8.22% under large Gaussian noise conditions. The practical results show that the proposed method can obtain higher definition of fringe image, and the reconstructed line-VISAR (1D-VISAR) fringe movement trend is clearer, which verifies the effectiveness of the algorithm.

     

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