Book Rvw: Modern Optical Engineering: The Design of Optical Systems. By Warren J. Smith.

Shannon, Robert R.

doi:10.1117/1.oe.30.1.bkrvw1

Cited by 22 publications

(41 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the MTF curves of R, G, and B channels were estimated by measuring the contrast values of a series of bar patterns on the reconstructed target images [29]. The contrast values of the selected bar patterns on the target were calculated by the equation: [30]

C = \frac{I_{italicmax} - I_{italicmin}}{I_{italicmax} + I_{italicmin}}

, where

I_{italicmax}

and

I_{italicmin}

are the averaged target bar patterns' maximal and minimal pixel values, respectively. After normalization, the contrast values were used to create MTF curves ranging from 0 to the cutoff frequency by a curve fitting method [31].…”

Section: Experimental Methodsmentioning

confidence: 99%

Using symmetric illumination and color camera to achieve high throughput Fourier ptychographic microscopy

Zhang

Gilley

Abdoli

et al. 2023

Journal of Biophotonics

View full text Add to dashboard Cite

This study aims to develop a high throughput Fourier ptychographic microscopy (FPM) technique based on symmetric illumination and a color detector, which is able to accelerate image acquisition by up to 12 times. As an emerging technology, the efficiency of FPM is limited by its data acquisition process, especially for color microscope image reconstruction. To overcome this, we built an FPM prototype equipped with a color camera and a 4×/0.13 NA objective lens. During the image acquisition, two symmetric LEDs illuminate the sample simultaneously using white light, which doubles the light intensity and reduces the total captured raw patterns by half. A standard USAF 1951 resolution target was used to measure the system's modulation transfer function (MTF) curve, and the H&E‐stained ovarian cancer samples were then imaged to assess the feature qualities depicted on the reconstructed images. The results showed that the measured MTF curves of red, green, and blue channels are generally comparable to the corresponding curves generated by conventional FPM, while symmetric illumination FPM preserves more tissue details, which is superior to the results captured by conventional 20×/0.4 NA objective lens. This investigation initially verified the feasibility of symmetric illumination based color FPM.

show abstract

C = \frac{I_{italicmax} - I_{italicmin}}{I_{italicmax} + I_{italicmin}}

, where

I_{italicmax}

and

I_{italicmin}

Section: Experimental Methodsmentioning

confidence: 99%

Using symmetric illumination and color camera to achieve high throughput Fourier ptychographic microscopy

Zhang

Gilley

Abdoli

et al. 2023

Journal of Biophotonics

View full text Add to dashboard Cite

show abstract

“…They have also been applied in indoor VLC scenarios, as in [36]. The portion of the light reflected (Fresnel reflection) from the surface of an ordinary dielectric VOLUME 11, 2023 material (such as glass) is given by [37]:…”

Section: ) Fresnel Lensmentioning

confidence: 99%

Enhancement of Vehicular Visible Light Communication Using Spherical Detector and Custom Lens Combinations

et al. 2023

View full text Add to dashboard Cite

Vehicular Visible light communication (VLC) technology has recently attracted much interest from researchers and scientists. This technology enables connectivity between vehicles and infrastructures along the road by using vehicles' headlights and taillights as wireless transmitters. The reliability of vehicleto-vehicle (V2V) VLC systems is affected by several factors, such as car mobility, optics system design, and visibility conditions, where the first two have the most impact on the VLC system performance. This paper, therefore, focuses on the relative positions of the cars and the design of the optics, especially on the receiving end, which has been proposed with the use of a polar detector instead of the rectangular detectors commonly used in the literature. We investigate the achievable gain compared to the conventional detector for different vehicle locations, utilizing a professional optical system design and ray tracing approach. Then, to improve the performance, we introduce the utilization of an imaging receiver by integrating the polar detector with different optical commercial lens combinations, such as Fresnel and Aspherical lenses. To further improve the V2V system performance, we propose a novel optical lens combination design by integrating double-convex lens with half-Plano-concave lens, which allows the correction of more optical aberrations, such as chromatic and spherical aberration. Utilizing the non-sequential ray tracing tools, we designed these VLC systems and perform a realistic channel modeling study considering the typical 3D CAD models of vehicles and roads as well as the possibility of horizontal and vertical movement between the vehicles. Based on the channel impulse responses (CIRs) obtained from the ray tracing simulations, we analyzed the performance of V2V VLC systems with all lens combinations at different vehicle positions on the road. We further investigated the impact of different system parameters on the overall V2V system performance, such as receiver diameter and bandwidth. The obtained results demonstrated that with a carefully chosen system and lens parameters, the proposed system design of lens combination provides an enhancement of up to 7 dB in total received power compared to the case without a lens. Our results also revealed that the proposed system design outperforms the benchmark ones for all lateral displacements and longitudinal distances.INDEX TERMS Vehicular communications, visible light communication, optical lens combination, polar detectors.

show abstract

“…Before we discuss in detail our approach, we will present the concepts of chromatics aberration [8][9], this is followed by our approach to image correction. Eq.…”

Section: Chromatic Aberrationmentioning

confidence: 99%

Self-image correction for low-cost imaging optic

Wang

Whitaker

2023

ETN

View full text Add to dashboard Cite

With the advent of computing power and higher resolution CMOS sensor, imaging camera for mobile phone application has become very common in consumer portable product such as mobile phone, tablet or even wearable devices and head mount devices . Higher resolution image sensor, on the other hand, will suffer chromatic aberration (CA) where the colour channel appears shifted. Better lens design with more lens elements may be required. However, this will add more cost and manufacturing challenges. Many studies and methods have been proposed for CA correction through post image processing and those methods required calibration or post image process before correction factor can be applied. In this paper, we propose a new algorithm that will pre-defined the CA correction factor through lens design simulation.

show abstract

Book Rvw: Modern Optical Engineering: The Design of Optical Systems. By Warren J. Smith.

Cited by 22 publications

References 0 publications

Using symmetric illumination and color camera to achieve high throughput Fourier ptychographic microscopy

Using symmetric illumination and color camera to achieve high throughput Fourier ptychographic microscopy

Enhancement of Vehicular Visible Light Communication Using Spherical Detector and Custom Lens Combinations

Self-image correction for low-cost imaging optic

Contact Info

Product

Resources

About