96 dB Linear High Dynamic Range CAOS Spectrometer Demonstration

Mazhar, Mohsin A.; Riza, Nabeel A.

doi:10.1109/lpt.2020.3038062

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…e preliminary investigation and data collection of this experimental research show that the typical building plane selection of multimedia classrooms is mostly rectangular, using curtain projection multimedia equipment, one-way side window lighting, or the other side of high side window lighting [14]. erefore, the "architectural optics laboratory" classroom of a university with the above typical characteristics and the facilities that can actively control natural and artificial lighting to adjust the light environment is selected as the experimental site for the experimental simulation.…”

Section: Selection Of Experimental Environment and Personnelmentioning

confidence: 99%

The Evaluation of Visual Clarity and Comfort of Light Environment in Multimedia Classroom

Dong

2022

Journal of Robotics

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In order to clarify the quantitative relationship between students’ visual clarity, comfort, and environmental brightness in the light environment of multimedia classrooms in colleges and universities and obtain the threshold and influence trends of brightness, visual clarity, and visual comfort in the light environment of the multimedia classroom, this paper proposes the research on the relevant influence parameters of the light environment of the multimedia classroom. Based on the analysis of the current situation of multimedia use in China, this paper proposes taking brightness as the main parameter of indoor light environment evaluation to carry out students’ subjective evaluation experiments. The brightness range that can reflect the visual clarity and visual comfort of the experimenter is extracted by using multimedia combined with screen projection and HDRI technology. Finally, by analyzing the experimental data, combined with the operational definition of the psychophysical threshold, the functional relationship between visual clarity, comfort, and brightness in the light environment of a multimedia classroom is obtained through regression analysis and the threshold and extreme point data are calculated. The experimental results show that when the brightness range is 370.83 cd/m2 ≤ X ≤ 558.47 cd/m2, it has better visual clarity and visual comfort. When the brightness contrast is close to 10 : 1, the visual clarity is the highest; when the brightness contrast is close to 5 : 1, the visual comfort is the highest and decreases on both sides with the change in its value. Conclusion. The results of this experimental study can provide a basis for formulating and revising relevant laws and regulations in the future and provide a reference for the light environment design of multimedia classrooms in China.

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Section: Selection Of Experimental Environment and Personnelmentioning

confidence: 99%

The Evaluation of Visual Clarity and Comfort of Light Environment in Multimedia Classroom

Dong

2022

Journal of Robotics

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“…Two independent studies were conducted, in which the focus was on the collection of the subjective ratings. The study format is following [30] , where a similar study was conducted in the real-world classroom.…”

Section: Discussionmentioning

confidence: 99%

Empirical study of lighting environment towards visual comfort in virtual multimedia classroom

Pan,

Wang,

Liu

et al. 2024

Fourth International Conference on Machine Learning and Computer Application (ICMLCA 2023)

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Virtual reality technology has been widely used in education scenarios. Among them, the immersive virtual multimedia classroom can mimic the physical classroom, so as to facilitate the performance of on-line learning. However, there are still gaps between the virtual and physical classroom, especially the lighting environment which plays an important role in the visual experience of participants. In this paper, we aim to study the relationship between the lighting parameters and the visual comfort. We firstly establish a virtual classroom with adjustable lighting parameters. Then we conduct user cases which mimic the natural and indoor lighting respectively, investigating the effect of the two different lighting environments upon the visual comfort. Particularly, we establish the empirical fitting models from the collected subjective ratings, which can provide the perception threshold and the optimal lighting conditions. The proposed method can benefit the design and implementation of virtual multimedia classroom.

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“…IT has shown been shown recently that extremely high (e.g., 96 dB) linear dynamic range spectrometry can be achieved using CAOS [1]. Specifically, the spectrometer demonstrated is a point spectrometer where the light emerging from a single point light source is spectrally resolved to generate the optical spectrum of the light source or point target sample under study for spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…Using the linear HDR CAOS point spectrometry results from ref. 1, it is further possible to realize a CAOS line and line-scan spectral imager design that has the core capabilities of linear performances with high dynamic ranges to match spectral target HDR responses. Hence this paper first proposes and demonstrates the basic design and experimental operation of the basic proof-of-principle CAOS spectral line camera.…”

Section: Introductionmentioning

confidence: 99%

CAOS spectral imager design and advanced high dynamic range FDMA–TDMA CAOS mode

Mazhar

Riza

2021

Appl. Opt.

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In the first part of the paper, a CAOS line camera is introduced for spectral imaging of one dimensional (1-D) or line targets. The proposed spectral camera uses both a diffraction grating as well as a cylindrical lens optics system to provide line imaging along the line pixels direction of the image axis and Fourier transforming operations in the orthogonal direction to provide line pixels optical spectrum analysis. The imager incorporates the Digital Micromirror Device (DMD)-based Coded Access Optical Sensor (CAOS) structure. The design includes a line-by-line scan option to enable two dimensional (2-D) spectral imaging. For the first time, demonstrated is line style spectral imaging using a 2850 K color temperature white light target illumination source along with visible band color bandpass filters and a moving mechanical pinhole to simulate a line target with individual pixels along 1-D that have unique spectral content. A ~412 nm to ~732 nm input target spectrum is measured using a 38 × 52 CAOS pixels spatial sampling grid providing a test image line of 38 pixels with each pixel providing a designed spectral resolution of ~6.2 nm. The spectral image is generated using the robust Code Division Multiple Access (CDMA) mode of the camera. The second part of the paper demonstrates for the first time the High Dynamic Range (HDR) operation of the Frequency Division Multiple Access (FDMA)-Time Division Multiple Access (TDMA) mode of the CAOS camera. The FDMA-TDMA mode also feature HDR recovery like the Frequency Modulation (FM)-TDMA mode, although at a much faster imaging rate and a higher Signal-to-Noise Ratio (SNR) as more than one CAOS pixel is extracted at a time. Experiments successfully demonstrate 66 dB HDR target recovery using both FDMA-TDMA and FM-TDMA modes, with the FDMA-TDMA mode operating at an encoding speed 8 times faster than the FM-TDMA mode given 8 FM channels are used for the FDMA-TDMA mode. The CAOS spectral imager can be used to image both full spectrum stationary line targets as well as spectrally map 2-D targets using line scanning methods. The demonstrated FDMA-TDMA CAOS mode is suited for improved speed and SNR linear HDR imaging.

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96 dB Linear High Dynamic Range CAOS Spectrometer Demonstration

Cited by 6 publications

References 28 publications

The Evaluation of Visual Clarity and Comfort of Light Environment in Multimedia Classroom

The Evaluation of Visual Clarity and Comfort of Light Environment in Multimedia Classroom

Empirical study of lighting environment towards visual comfort in virtual multimedia classroom

CAOS spectral imager design and advanced high dynamic range FDMA–TDMA CAOS mode

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