Recent Advances in Imaging and Non-Imaging Optical Technologies

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "New Applications Enabled by Photonics Technologies and Systems".

Deadline for manuscript submissions: 31 January 2027 | Viewed by 1029

Special Issue Editor


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Guest Editor
School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang, China
Interests: fringe projection profilometry; image highlight suppression; non-imaging optics; phase-measuring deflectometry
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Special Issue Information

Dear Colleagues,

The distinction between imaging and non-imaging optics has long defined two fundamental pathways for harnessing light—one focused on capturing and reproducing information, the other on shaping and directing luminous energy for functional purposes. Today, these once-separate domains are converging in unprecedented ways, driven by advances in design freedom, fabrication precision, and computational power. This cross-pollination is enabling a new generation of optical systems that are more compact, versatile, and intelligent than ever before.

This Special Issue aims to capture the breadth and dynamism of this evolving landscape. We seek to highlight innovative works that push the boundaries of optical design, measurement, and application. This includes advancements in areas such as structured light for 3D sensing, freeform and diffractive optical design, computational imaging, precision metrology, advanced illumination systems, and the integration of optics with intelligent processing algorithms. Submissions that advance core methodologies within each domain, as well as those that explore their synergistic combination in novel systems, are equally welcome.

We welcome original research articles, authoritative reviews, and significant case studies that present novel results, methodologies, or insightful perspectives. Contributions from all career stages are encouraged.

By consolidating cutting-edge work from these critical areas, this Special Issue aims to serve as a valuable reference and inspire future innovation. We look forward to receiving your submissions.

Sincerely,

Dr. Xiang Sun
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • structured light projection
  • 3D shape measurement
  • freeform optics
  • non-imaging optics
  • optical design and optimization
  • computational imaging
  • phase measurement and deflectometry
  • computer vision and pattern recognition
  • metrology and inspection
  • illumination design
  • machine/deep learning in optics

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Published Papers (2 papers)

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Research

17 pages, 2451 KB  
Article
Design of a Combined-Freeform-Surface Diffuse-Reflection System for High-Uniformity, Compact LED Inspection Illumination
by Jianghua Rao, Xin Xu, Riquan Zhou, Xiaowen Liang, Zhenmin Zhu, Yuanyuan Peng and Mingke Xu
Photonics 2026, 13(2), 188; https://doi.org/10.3390/photonics13020188 - 14 Feb 2026
Viewed by 385
Abstract
LED diffuse-illumination systems are widely used in industrial inspection and real life because of their scattering properties. However, there has been little research on secondary optical designs for diffuse illumination. Considering the need for diffuse light in real life and work, combined with [...] Read more.
LED diffuse-illumination systems are widely used in industrial inspection and real life because of their scattering properties. However, there has been little research on secondary optical designs for diffuse illumination. Considering the need for diffuse light in real life and work, combined with existing specular-reflection technology, this study proposes a design method for a combined-freeform-surface illumination system with specular and diffuse reflections. Considering that a separate diffusing device cannot effectively control the diffusion area of the light source, the unique properties of the specular-reflective device were utilized in this study. First, the specular-reflection device directs the light from the central portion of the LED to the diffuse-reflection device, and the light collected is then redistributed by the diffuse-reflection device. Two mathematical models were established according to the light-emitting angle of the LED, which corresponded to two freeform surfaces. In addition, when evaluating the uniformity of the target-plane illumination, a set of constraint equations was added to obtain the diffuse freeform surface contour of the target plane. Finally, the ratio of the diameter to the thickness of the resulting illumination system exceeded six, and the illumination uniformity increased to over 56% (with a uniformity improvement ratio of ≥6% compared to traditional single-freeform-surface systems and ≥10% compared to integrating sphere systems). It is specifically designed for industrial precision inspection scenarios, has higher illumination uniformity than other diffuse illumination systems, and has better compactness, making it suitable for high-precision inspection lighting applications. Full article
(This article belongs to the Special Issue Recent Advances in Imaging and Non-Imaging Optical Technologies)
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18 pages, 4151 KB  
Article
Adaptive Intensity Modulation for High Dynamic Range Target Measurement Based on Neighbourhood Diffusion
by Xiang Sun, Kai Zhou, Lingbao Kong, Jianjun Zeng, Yunpeng Zhang, Zhenjun Luo and Xing Peng
Photonics 2026, 13(2), 167; https://doi.org/10.3390/photonics13020167 - 9 Feb 2026
Viewed by 352
Abstract
Fringe projection profilometry has been widely adopted in various fields due to its non-contact nature, high accuracy, high speed, and full-field measurement capability. However, when measuring objects with highly reflective surfaces, saturation often occurs due to the limited dynamic range of the camera. [...] Read more.
Fringe projection profilometry has been widely adopted in various fields due to its non-contact nature, high accuracy, high speed, and full-field measurement capability. However, when measuring objects with highly reflective surfaces, saturation often occurs due to the limited dynamic range of the camera. To effectively address this issue, this paper proposes a novel adaptive fringe projection method. First, an intensity transfer model is established, which uses uniform grayscale images to compute surface reflectance coefficients and accurately determines the optimal projection intensity in the camera coordinate system. Subsequently, low-intensity orthogonal fringe patterns are employed to compute a smoothed absolute phase in saturated regions, establishing a coordinate mapping. The mapped pixel intensities are diffused into their neighborhoods, and the minimum value is taken in overlapping areas to generate an optimal projection intensity template in the projector coordinate system. Finally, adaptive fringe patterns are generated based on this template. Experimental results demonstrate that the proposed method achieves high-precision and high-completeness 3D measurement for objects with highly reflective surfaces. Full article
(This article belongs to the Special Issue Recent Advances in Imaging and Non-Imaging Optical Technologies)
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