Mr. Yunfei Geng Profile

Yunfei Geng

at Science and Technology on Electro-Optic Control Lab.

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Publications (4)

Proceedings Article | 24 November 2021 Paper

Research on the influence of different environment brightness on human eyes resolution

Lu Tong Sun, Liang Zhou, Yun Fei Geng, Zhuo Li

Proceedings Volume 12063, 120630I (2021) https://doi.org/10.1117/12.2607022

KEYWORDS: Visualization, Mirrors, Eye, Transmittance, Contrast sensitivity, Heads up displays, Human vision and color perception, Eye models

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Proceedings Article | 24 November 2021 Paper

Research on two-dimensional extended array waveguide display technology

Yan Li, Kai Liu, You Long, Yunfei Geng, Zhuo Li

Proceedings Volume 12063, 120630K (2021) https://doi.org/10.1117/12.2607029

KEYWORDS: Waveguides, Displays, Optical design, Eye, Geometrical optics, Display technology

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Proceedings Article | 24 November 2021 Paper

Research on binocular alignment measurement technology of helmet mounted display

Yunfei Geng, You Long, Lutong Sun, Yang Gao

Proceedings Volume 12063, 120630L (2021) https://doi.org/10.1117/12.2607065

KEYWORDS: Head-mounted displays, Prisms, Cameras, Optical alignment, Imaging systems, Error analysis

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As an important evaluation specification of the helmet mounted display, binocular alignment directly affects the imaging quality of the helmet mounted display, such as the imaging distance and the imaging clarity, and then has a vital impact on the combat effectiveness of the pilot and the aircraft. The traditional detection method relies on the human eye to align the collimator for subjective interpretation, the results are often uncertain because different people have different feelings. This paper proposes an automatic measurement method of binocular alignment based on a single digital camera. This method combines the binocular images of the helmet mounted display into the same optical path by placing a turning prism at the binocular exit pupil position of the helmet mounted display, thereby achieving the purpose of synchronously collecting binocular images by using a single digital camera. Digital image processing technology realizes automatic calculation of binocular alignment indicators, which greatly improves the measurement accuracy and the measurement efficiency. This method uses a turning prism to merge the binocular images of the helmet mounted display into one optical path. The camera can collect binocular images without moving during the measurement process, so it can avoid the straightness error caused by the use of a translation stage, and finally an objective, accurate and fast measurement of binocular alignment specification is obtained. At last, this article discusses the measurement principle of the method in detail, explains the optical-mechanical structure of the binocular alignment measurement equipment in detail, and analyzes the measurement accuracy. Finally, several binocular alignment test results are compared. The test results show that this method has obvious advantages in the measurement accuracy and the measurement efficiency. It can meet the needs of fast, accurate and objective measurement of the binocular alignment of the helmet mounted display, and has the value of a wide range of applications.

Proceedings Article | 24 November 2021 Paper

Research on the method and technology of determining the best image plane of head-up display

Yunfei Geng, Kai Liu, You Long, Qiang Ji

Proceedings Volume 12063, 120630J (2021) https://doi.org/10.1117/12.2607028

KEYWORDS: Heads up displays, Collimation, Image processing, Optical alignment, Displays

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