Real-time novel-view image synthesis on mobile devices is prohibitive due to
the limited computational power and storage. Using volumetric rendering
methods, such as NeRF and its derivatives, on mobile devices is not suitable
due to the high computational cost of volumetric rendering. On the other hand,
recent advances in neural light field representations have shown promising
real-time view synthesis results on mobile devices. Neural light field methods
learn a direct mapping from a ray representation to the pixel color. The
current choice of ray representation is either stratified ray sampling or
Pl\"{u}cker coordinates, overlooking the classic light slab (two-plane)
representation, the preferred representation to interpolate between light field
views. In this work, we find that using the light slab representation is an
efficient representation for learning a neural light field. More importantly,
it is a lower-dimensional ray representation enabling us to learn the 4D ray
space using feature grids which are significantly faster to train and render.
Although mostly designed for frontal views, we show that the light-slab
representation can be further extended to non-frontal scenes using a
divide-and-conquer strategy. Our method offers superior rendering quality
compared to previous light field methods and achieves a significantly improved
trade-off between rendering quality and speed.

在移动设备上实时进行新视角图像合成由于有限的计算能力和存储而受到限制。体积渲染方法（如 NeRF 及其衍生方法）在移动设备上使用不适宜，因为其计算成本高。然而，神经光场表示方法的最新进展在移动设备上展示了有希望的实时视角合成结果。我们发现使用光场平板表示对于学习神经光场是一种有效的表示方法。更重要的是，它是一种低维的射线表示方法，使我们能够使用相对更快的特征网格来学习 4D 射线空间。我们的方法提供了比以前的光场方法更高的渲染质量，并在渲染质量和速度之间实现了显著的改进平衡。