Fig. 7: Unseen view prediction from 4D-ONIX.
From: 4D-ONIX for reconstructing 3D movies from sparse X-ray projections via deep learning
The Index of Refraction (IoR) Generator calculates the refractive index at each 4D point (x, t). For each time point, multiple query points are taken along a specific ray direction to obtain the refractive index n (δ, β) along that ray. The refractive index is integrated along the ray using the physical principles of X-ray interaction with matter. This integration provides the value of each pixel in the predicted image. By utilizing more rays, we can generate a projection image.
