基于卡尔曼滤波的双约束CUP-VISAR压缩图像重构算法

Double-constrained CUP-VISAR compressed image reconstruction algorithm based on Kalman filtering

  • 摘要: 针对从基于压缩超快成像(Compressed Ultrafast Photography,CUP)的任意反射面速度干涉仪(Velocity Interferometer System for Any Reflector,VISAR)中获得的压缩图像中重构出冲击波二维条纹图像的问题,提出一种基于卡尔曼滤波的双约束图像重构算法。该算法首先基于条纹图像具有的稀疏性和平滑性,将问题转化为基于小波与全变分双先验约束的优化问题,然后,考虑到实际成像的噪声问题,采用加权卡尔曼滤波对图像已有信息进行预测和调整,最后将卡尔曼滤波引入二步迭代阈值算法的迭代过程中,进而求解该双约束优化问题,实现压缩图像的精确重构。在大噪声仿真实验中,该算法重构图像的峰值信噪比和结构相似度分别提高了4.8 dB和14.81%,显著提高了图像重构质量。在实际实验中,该算法重构出了清晰的冲击波条纹图像,且将冲击波速度最大相对误差降低了9.57%和平均相对误差降低了2.2%,验证了该算法的可行性。

     

    Abstract: A dual-constrained image reconstruction algorithm based on Kalman filtering is proposed to solve the problem of reconstructing the two-dimensional shock wave fringe image from the compressed image obtained by the Velocity Interferometer System for Any Reflector (VISAR) based on Compressed Ultrafast Photography (CUP). Based on the sparsity and smoothness of fringed images, the algorithm firstly transforms the problem into an optimization problem based on wavelet and total variational double prior constraints, and then, considering the noise of actual imaging, the weighted Kalman filter is used to predict and adjust the existing information of the image, and finally the Kalman filter is introduced into the iterative process of the two-step iterative threshold algorithm, and then the double-constraint optimization problem is solved to realize the accurate reconstruction of the compressed image. In the large-noise simulation experiment, the peak signal-to-noise ratio and structural similarity of the reconstructed images of the algorithm are increased by 4.8 dB and 14.81%, respectively, which significantly improves the image reconstruction quality. In actual experiments, the algorithm reconstructs a clear shock wave fringe image and reduces the maximum relative error of shock wave velocity by 9.57% and the average relative error of shock wave velocity by 2.2%, which verifies the feasibility of the algorithm.

     

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