scholarly journals Design of a High-Performance Digital Slit-Lamp Microscope with Five-Switched Zoom

2020 ◽  
Vol 10 (8) ◽  
pp. 2757 ◽  
Author(s):  
Youping Huang ◽  
Xiaogang Chen ◽  
Hao Zhang ◽  
Shuyan Huang ◽  
Feng Lin
Keyword(s):  
Optical System ◽  
Modulation Transfer Function ◽  
High Performance ◽  
Tolerance Analysis ◽  
Slit Lamp ◽  
Modulation Transfer ◽  
Coaxial System ◽  
Progressive Optimization ◽  
Telescope System ◽  
Quality Imaging

In this study, we design and present a five-fold digital slit-lamp microscope (DSLM) with built-in photographic lens and CCD. The initial structures of the front objective, Galilean telescope system, and photographic lens are systematically investigated and discussed in the design. A progressive optimization process is employed in the non-coaxial system design after the coaxial system achieves high performance. The analysis of spot diagrams and the modulation transfer function (MTF) show that this DSLM optical system achieves quasi-diffraction-limited performance and enables high-quality imaging for ophthalmic examination. Furthermore, tolerance analysis of this optical system is also performed, which provides a theoretical basis for machining and assembly. This design provides an idea for the design of a digital-zoom microscope in biomedical imaging instruments.

scholarly journals Modulation transfer function in the analysis of electro-optical system performance

2020 ◽  
Vol 68 (3) ◽  
pp. 572-597
Author(s):  
Nedeljko Pađen ◽  
Dragana Perić ◽  
Branko Livada ◽  
Milan Milosavljević
Keyword(s):  
Transfer Function ◽  
Optical System ◽  
Modulation Transfer Function ◽  
System Performance ◽  
Modulation Transfer

A New Adaptive Background Correction Method Based on Pinhole Image Analysis in Optical System Modulation Transfer Function Measurement

2011 ◽  
Vol 31 (8) ◽  
pp. 0812008
Author(s):  
段亚轩 Duan Yaxuan ◽  
陈永权 Chen Yongquan ◽  
赵建科 Zhao Jianke ◽  
李坤 Li Kun ◽  
龙江波 Long Jiangbo
Keyword(s):  
Image Analysis ◽  
Transfer Function ◽  
Optical System ◽  
Modulation Transfer Function ◽  
Correction Method ◽  
Background Correction ◽  
Modulation Transfer ◽  
Function Measurement ◽  
Pinhole Image

Structural Parameters Optimum Design of the New Type of Optical Aiming System

2014 ◽  
Vol 8 (1) ◽  
pp. 208-212
Author(s):  
Deng Xiang ◽  
Liu Kai ◽  
Wang Jidong
Keyword(s):  
Optimum Design ◽  
Working Conditions ◽  
Optical System ◽  
Modulation Transfer Function ◽  
Structural Parameters ◽  
Focal Length ◽  
Angle Measurement ◽  
Measurement Technology ◽  
Modulation Transfer ◽  
New Type

Combination of gyro north-finder, self-collimation photoelectric theodolite can be composed a ground rapid directional aiming system. In the paper, based on the CCD angle measurement technology, the self-collimation optical system is redesigned, focal length of the optical system is calculated, and the appropriate parameters are chosen. Optical conjugate design of the three light paths of light source module, visual module, and CCD receiving module is adopted to synchronize the transmission beams of the three light paths. The simulation and optimum design of light paths in the optical system are achieved by using the ZEMAX software. By analyzing the spot diagram and modulation transfer function (MTF), appropriate structural parameters of the optical system suitable for aiming working conditions are obtained.

scholarly journals Fast Reproducible Pansharpening Based on Instrument and Acquisition Modeling: AWLP Revisited

2019 ◽  
Vol 11 (19) ◽  
pp. 2315 ◽  
Author(s):  
Gemine Vivone ◽  
Luciano Alparone ◽  
Andrea Garzelli ◽  
Simone Lolli
Keyword(s):  
Modulation Transfer Function ◽  
High Performance ◽  
Remote Sensing Image ◽  
Spectral Responsivity ◽  
Modulation Transfer ◽  
High Performing ◽  
Injection Model ◽  
Assessment Procedures ◽  
Reduced Scale ◽  
The Ideal

Pansharpening is the process of merging the spectral resolution of a multi-band remote-sensing image with the spatial resolution of a co-registered single-band panchromatic observation of the same scene. Conceived and contextualized over 30 years ago, panharpening methods have progressively become more and more sophisticated, but simultaneously they have started producing fewer and fewer reproducible results. Their recent proliferation is most likely due to the lack of standardized assessment procedures and especially to the use of non-reproducible results for benchmarking. In this paper, we focus on the reproducibility of results and propose a modified version of the popular additive wavelet luminance proportional (AWLP) method, which exhibits all the features necessary to become the ideal benchmark for pansharpening: high performance, fast algorithm, absence of any manual optimization, reproducible results for any dataset and landscape, thanks to: (i) spatial analysis filter matching the modulation transfer function (MTF) of the instrument; (ii) spectral transformation implicitly accounting for the spectral responsivity functions (SRF) of the multispectral scanner; (iii) multiplicative detail-injection model with correction of the path-radiance term introduced by the atmosphere. The revisited AWLP has been comparatively evaluated with some of the high performing methods in the literature, on three different datasets from different instruments, with both full-scale and reduced-scale assessments, and achieves the first place, on average, in the ranking of methods providing reproducible results.

CALCULATION OF MODULATION TRANSFER FUNCTION OF AN OPTICAL SYSTEM BY USING SKEW RAY TRACING

2009 ◽  
Vol 33 (3) ◽  
pp. 429-442 ◽  
Author(s):  
Kuo-Hwa Tseng ◽  
Chieh Kung ◽  
Te-Tan Liao ◽  
Hao-Peng Chang
Keyword(s):  
Transfer Function ◽  
Ray Tracing ◽  
Optical System ◽  
Modulation Transfer Function ◽  
Image Plane ◽  
Modulation Transfer ◽  
Light Rays ◽  
Intermediate Image ◽  
Pass Through ◽  
And Performance

The resolution and performance of an optical system can be characterized by a quantity known as the modulation transfer function (MTF), which is a measurement of an optical system’s ability to transfer contrast from the specimen to the intermediate image plane at a specific resolution. Accordingly, this study employs skew ray tracing based on a 4 × 4 homogeneous coordinate transformation matrix and Snell’s law to develop a detailed methodology for determining the spot diagram on the image plane when light rays pass through the optical system. And the authors present calculations of the MTF of an optical system by using the spot diagram on the image plane. The numerical results of the proposed methodology are demonstrated using a symmetrical optical system.

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