An imaging method of wavefront coding system based on phase plate rotation

2018 ◽  
Author(s):  
Rigui Yi ◽  
Ming Liu ◽  
Xi Chen ◽  
Xiaohua Liu ◽  
Yuejin Zhao ◽  
...  
Keyword(s):  
Phase Plate ◽  
Imaging Method ◽  
Coding System ◽  
Wavefront Coding ◽  
Plate Rotation

scholarly journals Experimental analysis of a wavefront coding system with a phase plate in different surfaces

2019 ◽  
Vol 58 (33) ◽  
pp. 9195
Author(s):  
Xiaoxiao Wei ◽  
Jingjing Han ◽  
Shuping Xie ◽  
Bo Yang ◽  
Xinjun Wan ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Phase Plate ◽  
Coding System ◽  
Wavefront Coding

scholarly journals Optical Aberration Calibration and Correction of Photographic System Based on Wavefront Coding

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4011
Author(s):  
Chuanwei Yao ◽  
Yibing Shen
Keyword(s):  
Imaging System ◽  
Optical Design ◽  
Computational Imaging ◽  
Large Field ◽  
Wavefront Aberration ◽  
Imaging Method ◽  
Image Deconvolution ◽  
Pupil Function ◽  
Wavefront Coding ◽  
Blurred Images

The image deconvolution technique can recover potential sharp images from blurred images affected by aberrations. Obtaining the point spread function (PSF) of the imaging system accurately is a prerequisite for robust deconvolution. In this paper, a computational imaging method based on wavefront coding is proposed to reconstruct the wavefront aberration of a photographic system. Firstly, a group of images affected by local aberration is obtained by applying wavefront coding on the optical system’s spectral plane. Then, the PSF is recovered accurately by pupil function synthesis, and finally, the aberration-affected images are recovered by image deconvolution. After aberration correction, the image’s coefficient of variation and mean relative deviation are improved by 60% and 30%, respectively, and the image can reach the limit of resolution of the sensor, as proved by the resolution test board. Meanwhile, the method’s robust anti-noise capability is confirmed through simulation experiments. Through the conversion of the complexity of optical design to a post-processing algorithm, this method offers an economical and efficient strategy for obtaining high-resolution and high-quality images using a simple large-field lens.

Wide viewing angle skewed effect of the point spread function in a wavefront coding system

2007 ◽  
Vol 32 (10) ◽  
pp. 1220 ◽  
Author(s):  
Tingyu Zhao ◽  
Zi Ye ◽  
Wenzi Zhang ◽  
Yanping Chen ◽  
Feihong Yu
Keyword(s):  
Point Spread Function ◽  
Viewing Angle ◽  
Coding System ◽  
Point Spread ◽  
Wide Viewing Angle ◽  
Wavefront Coding ◽  
Spread Function

Design of TMC wavefront coding system based on user defined surface mask plate

2018 ◽  
Author(s):  
Xiaohu Guo ◽  
Tielin Lu ◽  
Jingjing Zhu ◽  
Weiwei Zhu ◽  
Meng Guo ◽  
...  
Keyword(s):  
Coding System ◽  
Wavefront Coding

The analysis of ray aberration of arbitrary phase mask in the wavefront coding system

2008 ◽  
Vol 281 (18) ◽  
pp. 4577-4580 ◽  
Author(s):  
Weiwei Huang ◽  
Zi Ye ◽  
Wenzi Zhang ◽  
Tingyu Zhao ◽  
Feihong Yu
Keyword(s):  
Phase Mask ◽  
Coding System ◽  
Wavefront Coding ◽  
Arbitrary Phase

Strehl ratio analysis for the wavefront coding system

2007 ◽  
Author(s):  
Wenzi Zhang ◽  
Zi Ye ◽  
Tingyu Zhao ◽  
Feihong Yu
Keyword(s):  
Ratio Analysis ◽  
Strehl Ratio ◽  
Coding System ◽  
Wavefront Coding

Electron microscopy of biological specimens by means of an electrostatic phase plate

1972 ◽  
Vol 329 (1578) ◽  
pp. 327-359 ◽  
Keyword(s):  
Spherical Aberration ◽  
Special Property ◽  
Field Method ◽  
Objective Lens ◽  
Phase Plate ◽  
Imaging Method ◽  
Contrast Effects ◽  
Resolution Limit ◽  
Bright Field ◽  
Microscope Imaging

A new electron microscope imaging method has been developed that is especially suited to the study of thin biological materials. It involves the use of an electrostatic phase plate - a device which creates a more or less uniform difference in optical path between the un­scattered and scattered waves by means of its electric field. This phase plate functions in an analogous manner to the absorbing bright contrast phase plate of light microscopy. The contrast effects and aberrations peculiar to the method have been examined and are discussed in terms of their likely influence on the image’s representation of the object structure. Analysis of electron micrographs of some biological test specimens, whose structure is relatively well known, confirms that this representation, to a resolution of ca . 0.85 nm, is a particularly faithful one. In the analysis the resolution limit was determined by the degree of specimen preservation, and a real limit, determined by the degree of spherical aberration in the objective lens, of ca . 0.5 nm is expected. A special property of the imaging method, as distinct from the conventional bright field method, is that it emphasizes the detail within the biological material itself, but reduces the contrast from the surrounding film of stain; negative staining remains necessary only because it helps to preserve the morphology of the specimen during irradiation. Evidence is presented that this property enables the method to display information about the specimen that it would not be possible to detect with the bright field method.

Sign in / Sign up

Export Citation Format

Share Document