Impacts on quality are because, especially in radiology, new equipment offers higher imaging quality and reduced radiation exposure, owing to the improvement of technologies using X-rays or to the substitution of non-ionizing technologies (e.g. MR imaging).
An LSRTM image with 40 iterations and its zoom view are shown in Fig. 9a, b, which have higher imaging quality than RTM result, but still contain migration artifacts.
SDF imaging has been shown to provide a higher imaging quality with more detail and less motion blur than its predecessor Orthogonal Polarization Spectral (Ops) imaging [ 7].
To achieve high imaging quality artifacts, the holes must be inpainted after image warping which means high computational complexity.
Finally a nonlinear differentiator is proposed to improve the speed stability in the tracking to ensure high imaging quality.
In order to solve these problems, we have proposed a novel imaging receiver scheme based on fisheye lens for spatial-multiplexing VLC applications [18], which features ultra-wide FOV, good illumination uniformity, ultra-high imaging quality, and compact size.
In conclusion, this paper has presented the high-diversity fisheye-lens-based VLC system, which can realize high-performance SDM transmission because of the advantages of ultra-wide FOV, good illumination uniformity, ultra-high imaging quality, and compact size.
The receiver features ultra-wide field-of-view, good illumination uniformity, ultra-high imaging quality, and compact size; therefore, it can realize omnidirectional receiving and provide high spatial diversity for the SDM VLC system.
It should be noted that the fisheye lens, which is a bionic lens assembly that covers the hemispherical field, offers many advantages [19], including ultra-wide FOV (≥180°), good illumination uniformity, and ultra-high imaging quality.
Since the fisheye lens has ultra-high imaging quality, the projected light is focused onto a single dot p ' on the focal plane, whose coordinate is given by [18] {rho}^{prime }={k}_1theta +{k}_2{theta}^2+{k}_3{theta}^3+{k}_4{theta}^4+{k}_5{theta}^5 left(mathrm{m}right) (2 where k i is the ith order coefficient and θ is the incident angle to the receiver.
The hairs-containing phantom was used to demonstrate the high imaging quality of our system.
