P-94: Free-form Micro-optical Design for Enhancing Image Quality (MTF) at Large FOV in Light Field Near Eye Display

2018 ◽  
Vol 49 (1) ◽  
pp. 1534-1537 ◽  
Author(s):  
Jui-Yi Wu ◽  
Yu-Ching Cheng ◽  
Yi-Pai Huang ◽  
Hsin-Hsiang Lo ◽  
Chuan-Chung Chang ◽  
...  
Keyword(s):  
Image Quality ◽  
Light Field ◽  
Optical Design ◽  
Free Form

No-Reference Light Field Image Quality Assessment Based on Depth, Structural and Angular Information

2021 ◽  
pp. 108063
Author(s):  
Jianjun Xiang ◽  
Gangyi Jiang ◽  
Mei Yu ◽  
Yongqiang Bai ◽  
Zhongjie Zhu
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Light Field ◽  
Image Quality Assessment ◽  
Light Field Image

scholarly journals Light Field Image Quality Enhancement by a Lightweight Deformable Deep Learning Framework for Intelligent Transportation Systems

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1136
Author(s):  
David Augusto Ribeiro ◽  
Juan Casavílca Silva ◽  
Renata Lopes Rosa ◽  
Muhammad Saadi ◽  
Shahid Mumtaz ◽  
...  
Keyword(s):  
Deep Learning ◽  
Image Quality ◽  
Intelligent Transportation Systems ◽  
Light Field ◽  
State Of The Art ◽  
Intelligent Transportation ◽  
Transportation Systems ◽  
Machine Learning Algorithms ◽  
Learning Framework ◽  
Reconstruction Methods

Light field (LF) imaging has multi-view properties that help to create many applications that include auto-refocusing, depth estimation and 3D reconstruction of images, which are required particularly for intelligent transportation systems (ITSs). However, cameras can present a limited angular resolution, becoming a bottleneck in vision applications. Thus, there is a challenge to incorporate angular data due to disparities in the LF images. In recent years, different machine learning algorithms have been applied to both image processing and ITS research areas for different purposes. In this work, a Lightweight Deformable Deep Learning Framework is implemented, in which the problem of disparity into LF images is treated. To this end, an angular alignment module and a soft activation function into the Convolutional Neural Network (CNN) are implemented. For performance assessment, the proposed solution is compared with recent state-of-the-art methods using different LF datasets, each one with specific characteristics. Experimental results demonstrated that the proposed solution achieved a better performance than the other methods. The image quality results obtained outperform state-of-the-art LF image reconstruction methods. Furthermore, our model presents a lower computational complexity, decreasing the execution time.

Light Field Image Quality Assessment Using Contourlet Transform

2021 ◽  
Author(s):  
Hailiang Huang ◽  
Huanqiang Zeng ◽  
Jing Chen ◽  
Canhui Cai ◽  
Kai-Kuang Ma
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Light Field ◽  
Image Quality Assessment ◽  
Contourlet Transform ◽  
Light Field Image

Light Field Image Quality Assessment via the Light Field Coherence

2020 ◽  
Vol 29 ◽  
pp. 7945-7956 ◽  
Author(s):  
Yu Tian ◽  
Huanqiang Zeng ◽  
Junhui Hou ◽  
Jing Chen ◽  
Kai-Kuang Ma
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Light Field ◽  
Image Quality Assessment ◽  
Light Field Image ◽  
Field Coherence

Image quality evaluation of light field photography

2011 ◽  
Author(s):  
Qiang Fu ◽  
Zhiliang Zhou ◽  
Yan Yuan ◽  
Bin Xiangli
Keyword(s):  
Image Quality ◽  
Quality Evaluation ◽  
Light Field ◽  
Image Quality Evaluation

scholarly journals A wave optics model for the effect of partial coherence on coherent diffractive imaging

2021 ◽  
Vol 28 (2) ◽  
pp. 499-504
Author(s):  
Zhongzhu Zhu ◽  
Han Xu ◽  
Lingfei Hu ◽  
Ming Li ◽  
Peng Liu ◽  
...  
Keyword(s):  
Image Quality ◽  
Light Field ◽  
Critical Role ◽  
3D Structure ◽  
Finite Size ◽  
Partial Coherence ◽  
Wave Optics ◽  
X Rays ◽  
Diffractive Imaging ◽  
Coherent Diffractive Imaging

With the development of fourth-generation synchrotron sources, coherent diffractive imaging (CDI) will be a mainstream method for 3D structure determination at nanometre resolution. The partial coherence of incident X-rays plays a critical role in the reconstructed image quality. Here a wave optics model is proposed to analyze the effect of partial coherence on CDI for an actual beamline layout, based on the finite size of the source and the influence of the optics on the wavefront. Based on this model, the light field distribution at any plane, the coherence between any two points on this plane and CDI experiments can be simulated. The plane-wave CDI simulation result also shows that in order to reconstruct good image quality of complex samples the visibility of the interference fringes of any two points in the horizontal and vertical directions of the incident light field at the sample needs to be higher than 0.95.

scholarly journals Design and Optimization of a Linear Wavenumber Spectrometer with Cylindrical Optics for Line Scanning Optical Coherence Tomography

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6463
Author(s):  
Sevin Samadi ◽  
Javad Dargahi ◽  
Sivakumar Narayanswamy
Keyword(s):  
Optical Coherence Tomography ◽  
Image Quality ◽  
High Speed ◽  
High Efficiency ◽  
Optical Design ◽  
Optical Coherence ◽  
High Speed Imaging ◽  
Nonlinearity Error ◽  
Line Scanning

We report the design of a high-efficiency spectral-domain spectrometer with cylindrical optics for line scanning optical coherence tomography (OCT). The spectral nonlinearity in k space (wavenumber) lowers the depth-dependent signal sensitivity of the spectrometers. For linearizing, in this design, grating and prism have been introduced. For line scanning, a cylindrical mirror is utilized in the scanning part. Line scanning improves the speed of imaging compared to fly-spot scanning. Line scanning OCT requires a spectrometer that utilizes cylindrical optics. In this work, an optical design of a linear wavenumber spectrometer with cylindrical optics is introduced. While there are many works using grating and prism to linearize the K space spectrometer design, there is no work on linearizing the k-space spectrometer with cylindrical optics for line scanning that provides high sensitivity and high-speed imaging without the need for resampling. The design of the spectrometer was achieved through MATLAB and ZEMAX simulations. The spectrometer design is optimized for the broadband light source with a center wavelength of 830 ± 100 nm (8.607 μm−1− 6.756 μm−1 in k-space). The variation in the output angle with respect to the wavenumber can be mentioned as a nonlinearity error. From our design results, it is observed that the nonlinearity error reduced from 147.0115 to 0.0149 Δθ*μm within the wavenumber range considered. The use of the proposed reflective optics for focusing reduces the chromatic aberration and increases image quality (measured by the Strehl ratio (SR)). The complete system will provide clinicians a powerful tool for real-time diagnosis, treatment, and guidance in surgery with high image quality for in-vivo applications.

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