Sci-Thur PM: YIS - 08: The effect of copper conversion plates on low-Z target image quality

2012 ◽  
Vol 39 (7Part2) ◽  
pp. 4623-4623
Author(s):  
D Parsons ◽  
JL Robar
Keyword(s):  
Image Quality ◽  
Target Image ◽  
Effect Of Copper

The effect of copper conversion plates on low-Z target image quality

2012 ◽  
Vol 39 (9) ◽  
pp. 5362-5371 ◽  
Author(s):  
David Parsons ◽  
James L. Robar
Keyword(s):  
Image Quality ◽  
Target Image ◽  
Effect Of Copper

scholarly journals Modeling and image quality enhancement for dynamic compressive imaging system

2021 ◽  
Vol 15 ◽  
pp. 174830262110080
Author(s):  
Changjun Zha* ◽  
Qian Zhang* ◽  
Huimin Duan
Keyword(s):  
Image Quality ◽  
Imaging System ◽  
Quality Enhancement ◽  
Target Image ◽  
Compressive Imaging ◽  
Image Quality Enhancement ◽  
System A ◽  
Single Column ◽  
The Impact

Traditional single-pixel imaging systems are aimed mainly at relatively static or slowly changing targets. When there is relative motion between the imaging system and the target, sizable deviations between the measurement values and the real values can occur and result in poor image quality of the reconstructed target. To solve this problem, a novel dynamic compressive imaging system is proposed. In this system, a single-column digital micro-mirror device is used to modulate the target image, and the compressive measurement values are obtained for each column of the image. Based on analysis of the measurement values, a new recovery model of dynamic compressive imaging is given. Differing from traditional reconstruction results, the measurement values of any column of vectors in the target image can be used to reconstruct the vectors of two adjacent columns at the same time. Contingent upon characteristics of the results, a method of image quality enhancement based on an overlapping average algorithm is proposed. Simulation experiments and analysis show that the proposed dynamic compressive imaging can effectively reconstruct the target image; and that when the moving speed of the system changes within a certain range, the system reconstructs a better original image. The system overcomes the impact of dynamically changing speeds, and affords significantly better performance than traditional compressive imaging.

Research on Image Segmentation Technique for Pebrine in Silkworm Based on HSI Model

2010 ◽  
Vol 139-141 ◽  
pp. 2019-2023
Author(s):  
Dao De Zhang ◽  
Xin Yu Hu ◽  
Yu Rong Pan ◽  
Guang You Yang
Keyword(s):  
Image Segmentation ◽  
Image Quality ◽  
Contrast Enhancement ◽  
Color Model ◽  
Object Image ◽  
Target Image ◽  
Direct Extraction ◽  
Target Extraction ◽  
Hsi Color Model ◽  
Threshold Processing

To segment the pebrine from the background effectively, this paper focuses on the research of image segmentation technology on the basis of HSI color model. Owing to the complex background and poor contrast of the pebrine image, the method of contrast enhancement is adopted to improve the image quality; the technology of target extraction based on HSI model is used to realize the direct extraction of the colorized object image from the background, which utilizes the color characteristic of pebrine image; Meanwhile, the research on the threshold processing on the basis of shape feature of pebrine image can be done to improve the efficiency of algorithm, which minimizes the influence of non-target image, and the method of morphology can be applied to eliminate the hole or dot noise, and to separate the adhesive pebrines, which increases the accuracy of pebrine recognition. The result shows the method reasonable and effective.

scholarly journals Influence of a thermally bloomed atmosphere on target image quality

1982 ◽  
Vol 21 (4) ◽  
pp. 596 ◽  
Author(s):  
David A. Nahrstedt
Keyword(s):  
Image Quality ◽  
Target Image

Self-Induced Thermal Distortion Effects on Target Image Quality

1972 ◽  
Vol 11 (6) ◽  
pp. 1419 ◽  
Author(s):  
Frederick G. Gebhardt
Keyword(s):  
Image Quality ◽  
Thermal Distortion ◽  
Target Image

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

An Environmental Wet Cell For High Voltage Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 18-19
Author(s):  
N.J. Tighe ◽  
H.M. Flower ◽  
P.R. Swann
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Image Quality ◽  
Inelastic Scattering ◽  
High Voltage ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
Environmental Cell ◽  
Water Saturated ◽  
High Temperature Gas

A differentially pumped environmental cell has been developed for use in the AEI EM7 million volt microscope. In the initial version the column of gas traversed by the beam was 5.5mm. This permited inclusion of a tilting hot stage in the cell for investigating high temperature gas-specimen reactions. In order to examine specimens in the wet state it was found that a pressure of approximately 400 torr of water saturated helium was needed around the specimen to prevent dehydration. Inelastic scattering by the water resulted in a sharp loss of image quality. Therefore a modified cell with an ‘airgap’ of only 1.5mm has been constructed. The shorter electron path through the gas permits examination of specimens at the necessary pressure of moist helium; the specimen can still be tilted about the side entry rod axis by ±7°C to obtain stereopairs.

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