There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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Flow The Psychology Of Optimal Experience

This paper presents a new reflectance model for rendering computer synthesized images. The model accounts for the relative brightness of different materials and light sources in the same scene. It describes the directional distribution of the reflected light and a color shift that occurs as the reflectance changes with incidence angle. The paper presents a method for obtaining the spectral energy distribution of the light reflected from an object made of a specific real material and discusses a procedure for accurately reproducing the color associated with the spectral energy distribution. The model is applied to the simulation of a metal and a plastic.

A reflectance model for computer graphics

Methods of manufacturing a liquid crystal device including depositing a layer of liquid crystal material on a substrate and imprinting a pattern on the layer of liquid crystal material using an imprint template are disclosed. The liquid crystal material can be jet deposited. The imprint template can include surface relief features, Pancharatnam-Berry Phase Effect (PBPE) structures or diffractive structures. The liquid crystal device manufactured by the methods described herein can be used to manipulate light, such as for beam steering, wavefront shaping, separating wavelengths and/or polarizations, and combining different wavelengths and/or polarizations.

Virtual and augmented reality systems and methods

In this work, we report the set-up and results of the Liver Tumor Segmentation Benchmark (LITS) organized in conjunction with the IEEE International Symposium on Biomedical Imaging (ISBI) 2016 and International Conference On Medical Image Computing Computer Assisted Intervention (MICCAI) 2017. Twenty four valid state-of-the-art liver and liver tumor segmentation algorithms were applied to a set of 131 computed tomography (CT) volumes with different types of tumor contrast levels (hyper-/hypo-intense), abnormalities in tissues (metastasectomie) size and varying amount of lesions. The submitted algorithms have been tested on 70 undisclosed volumes. The dataset is created in collaboration with seven hospitals and research institutions and manually reviewed by independent three radiologists. We found that not a single algorithm performed best for liver and tumors. The best liver segmentation algorithm achieved a Dice score of 0.96(MICCAI) whereas for tumor segmentation the best algorithm evaluated at 0.67(ISBI) and 0.70(MICCAI). The LITS image data and manual annotations continue to be publicly available through an online evaluation system as an ongoing benchmarking resource.

The Liver Tumor Segmentation Benchmark (LiTS)

A new type of volumetric display is developed using multiple mini-projectors and a rotating screen. A novel illumination subsystem is designed to ensure accurate synchronization between the projectors and the rotating screen. Therefore, low-speed and low-cost miniature display devices can be used in the mini-projectors to realize dynamic volumetric imaging with full color and high resolution.

26.3: Volumetric Display System Using Multiple Mini‐Projectors

Sparse deformation prediction using Markove Decision Processes (MDP) for Non-rigid registration of MR image

Metasurfaces based on geometric phase acquired from the conversion of the optical spin states provide a robust control over the wavefront of light, and have been widely employed for construction of various types of functional metasurface devices. However, this powerful approach cannot be readily transferred to the manipulation of acoustic waves because acoustic waves do not possess the spin degree of freedom. Here, we propose the concept of acoustic geometric-phase meta-array by leveraging the conversion of orbital angular momentum of acoustic waves, where well-defined geometric-phases can be attained through versatile topological charge conversion processes. This work extends the concept of geometric-phase metasurface from optics to acoustics, and provides a new route for acoustic wave control.

https://robots.iopscience.iop.org/article/10.1088/1367-2630/ac33f2/pdf

Acoustic geometric-phase meta-array

Prior information constrained alternating direction method of multipliers for longitudinal compressive sensing MR imaging

Free-form-surface prism (FFSP) based HMDs have widespread application value and prospect in the fields of virtual
reality and augmented reality. A key problem of the FFSP-based HMDs is the correction for optical distortions. The
distortion correction can be performed with an additional optical system, but the additional system will add the expense
and complexity of the HMDs. This paper presents a software-based method to correct optical distortions in FFSP-based
HMDs, in which a distortion map with predistortion information is constructed to correct the distortion and a pixelfusion
process is performed to improve the quality of the predistortion image. The correction process and the fusion
process are accomplished by GPU in real-time. The performance of the proposed method is analyzed and validated via
an inspection system, in which a high-performance CCD camera is used to evaluate the result of the correction and
fusion.

Yongtian Wang

Papers

26.3: Volumetric Display System Using Multiple Mini‐Projectors

Sparse deformation prediction using Markove Decision Processes (MDP) for Non-rigid registration of MR image

Acoustic geometric-phase meta-array

Prior information constrained alternating direction method of multipliers for longitudinal compressive sensing MR imaging

Real-time correction and fusion for optical distortions in head-mounted displays