基于亚像素偏移的高质量鬼成像目标重构方法

针对欠采样次数下传统计算鬼成像重构图像分辨率差和对比度低的问题,提出了一种基于亚像素偏移的高质量鬼成像目标重构方法.本文通过分析不同颗粒大小散斑图的重构图像特性以及亚像素散斑偏移的特性后,采用2 pixelX 2 pixel的大尺寸散斑颗粒在空间位置分别进行水平、垂直、斜向偏移,结合未偏移原始散斑图分别对未知目标进行图...

High quality ghost imaging target reconstruction based on subpixel-shifting

Aiming at the problem of poor resoluti on and low visibility of traditional ghost imaging reconstruction images under u nder-sampling numbers,a high-quality ghost imaging target reconstruction method based on sub-pixel shifting is proposed.In this paper,after analyzing the recon structed image characteristics of speckle patterns of different pattern sizes a nd the characteristics of subpixel speckle-shifting,the 2pixel×2pixel large-s ize speckle pattern are used to offset horizontally,vertically,and diagonally in the spatial position respectively.The unshifted original speckle pattern is u sed to reconstruct the unknown target separately,and the complementary informati on existing in each reconstructed image due to sub-pixel displacement is merged into the same image by performing the gray average of the corresponding pixels on the four reconstructed images.In the image,the imaging with 1pixel×1pixel re solution is realized.Numerical simulation and experimental results show that usi ng signal-to-noise ratio,visibility,and structural similarity as evaluation in dicators,under the same sampling numbers,compared with the unshifted speckle patte rn reconstructed image,both high visibility and resolution are obtained.Reconstr ucting the image can largely avoid the problem of missing details in the imaging process,in which the signal-to- noise ratio,visibility,and structural similari ty are improved by an average of 61.2%/46.3%/59.8% respectively.