Evaluation of imaging quality of CCD camera by measuring MTFs at different contrasts

2011 ◽  
Author(s):  
Wenjuan Li ◽  
Fenglin Chen ◽  
Chuan Liang ◽  
Min Fu ◽  
Maohua Yang
Keyword(s):  
Ccd Camera ◽  
Imaging Quality

Modulation Transfer Function Measurement System at Different Contrasts for CCD Camera

2012 ◽  
Vol 241-244 ◽  
pp. 648-652
Author(s):  
Wen Juan Li ◽  
Chuan Liang ◽  
Ning Zhi Jin ◽  
Mei Lan Zhou
Keyword(s):  
Measurement System ◽  
Ccd Camera ◽  
Imaging Systems ◽  
Integrating Sphere ◽  
Test Target ◽  
Modulation Transfer ◽  
Imaging Quality ◽  
The Face ◽  
The Many

In order to achieve MTFs at different contrasts, the MTF measurement system is designed and developed. Two integrating spheres are used to illuminate the face and back of the test target uniformly. The target luminance and background luminance of the test target are regulated by adjusting the attenuators near the entrance of each integrating sphere. The many groups’ experimental results indicate that the luminance differences between the values by the system and those by L88 first level luminance meter, which is checked by National Institute of Metrology P. R. China, are within ±0.3 cd/m2. Thereby the measurement precision can be ensured in MTF test. MTFs of Sony camera and Cannon camera at different contrasts are measured by this system. The measurement values show that MTFs at different contrasts can demonstrate the imaging quality fully and objectively. This study provides an effective method to evaluate the imaging quality of visible imaging systems.

Spot-scan imaging of ice-embedded catalase crystal on a slow-scan CCD camera in a 400-kV electron cryomicroscope

1994 ◽  
Vol 52 ◽  
pp. 98-99
Author(s):  
Wah Chiu ◽  
Michael Sherman ◽  
Jaap Brink
Keyword(s):  
Electron Diffraction ◽  
Ccd Camera ◽  
Protein Crystal ◽  
Modulation Transfer ◽  
Measured Intensity ◽  
3 Dimensional ◽  
Dimensional Reconstruction ◽  
Diffraction Patterns ◽  
Complex Crystal

In protein electron crystallography, both low dose electron diffraction patterns and images are needed to provide accurate amplitudes and phases respectively for a 3-dimensional reconstruction. We have demonstrated that the Gatan 1024x1024 model 679 slow-scan CCD camera is useful to record electron diffraction intensities of glucose-embedded crotoxin complex crystal to 3 Å resolution. The quality of the electron diffraction intensities is high on the basis of the measured intensity equivalence ofthe Friedel-related reflections. Moreover, the number of patterns recorded from a single crystal can be as high as 120 under the constraints of radiation damage and electron statistics for the reflections in each pattern.A limitation of the slow-scan CCD camera for recording electron images of protein crystal arises from the relatively large pixel size, i.e. 24 μm (provided by Gatan). The modulation transfer function of our camera with a P43 scintillator has been determined for 400 keV electrons and shows an amplitude fall-off to 0.25 at 1/60 μm−1.

scholarly journals A NEW CONCEPT OF DISCRETIZATION MODEL FOR IMAGING IMPROVING IN ULTRASOUND TRANSMISSION TOMOGRAPHY

2019 ◽  
Vol 9 (4) ◽  
pp. 48-51
Author(s):  
Tomasz Rymarczyk ◽  
Krzysztof Polakowski ◽  
Jan Sikora
Keyword(s):  
Noisy Data ◽  
Transmission Tomography ◽  
Imaging Quality ◽  
Internal Objects

In this paper a new version of discretization model for Ultrasonic Transmission Tomography is presented. The algorithm has been extensively tested for synthetic noisy data on various configurations of internal objects. In order to improve the imaging quality, the pixels/voxels have been enlarged compared to the figures inscribed in pixels/voxels however no more than figures described on the standard square pixels or cubic voxels. The proposed algorithm provides better quality of imaging.

Analysis of angle vibration effects on imaging quality of synthetic aperture ladar

Optik ◽  
2018 ◽  
Vol 157 ◽  
pp. 298-305
Author(s):  
Liang Guo ◽  
Wei Li ◽  
Xiaozhen Li ◽  
Guanglie Hong ◽  
Jiangfeng Zhu ◽  
...  
Keyword(s):  
Synthetic Aperture ◽  
Imaging Quality

Imaging Quality of Double-Circle Sparse Aperture Array Configuration

2009 ◽  
Vol 29 (10) ◽  
pp. 2774-2779
Author(s):  
刘丽 Liu Li ◽  
江月松 Jiang Yuesong ◽  
王长伟 Wang Changwei
Keyword(s):  
Imaging Quality ◽  
Array Configuration ◽  
Sparse Aperture ◽  
Aperture Array

Effects on Imaging Quality of Defects in the Photonic Crystal with Negative Refraciton Material

2015 ◽  
Vol 35 (4) ◽  
pp. 0416004
Author(s):  
刘逢芳 Liu Fengfang ◽  
朱兆杰 Zhu Zhaojie ◽  
童元伟 Tong Yuanwei
Keyword(s):  
Photonic Crystal ◽  
Imaging Quality

Imaging Quality of Bifocal Piggyback Intraocular Lens versus ReSTOR and TECNIS Multifocal Lenses

2010 ◽  
Vol 20 (1) ◽  
pp. 71-75 ◽  
Author(s):  
José M. Artigas ◽  
Adelina Felipe ◽  
Manuel Díaz-Llopis ◽  
Salvador García-Delpech ◽  
Amparo Navea
Keyword(s):  
Intraocular Lens ◽  
Imaging Quality
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