Computer Graphics meets Estimation Theory: Parameter Estimation Lower Bounds for Plenoptic Imaging Systems

Maximizing the non-line-of-sight information content retrievable from passive scattered light fields: a comparison between visible, long wave infrared, and terahertz radiation

“…Several previous authors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] have developed passive methods for the aforementioned purpose using visible radiation. However, the performance of these methods is often compromised by the significant scattering produced by the rough surface of the wall and the visible ambient light.…”

“…𝑠) 𝑑𝑥 ≡ 𝑔 (𝑠; 𝑧 ).By applying the separable approximation from Eq (12). to the above 𝑊 , we can obtain the following relation:𝑔 (𝑠; 𝑧 ) = |ℱ [𝑝(𝑢)](𝑓 )| 𝑝 𝑙 𝑧 (𝑥 − 𝑠) 𝑑𝑥 , 𝑤ℎ𝑒𝑟𝑒 𝑓 = 𝑥 𝜆(𝑙 + 𝑧 ) ,where the function 𝑔 is seen as a result of a spatial convolution of the diffraction and the defocus effects.…”