Study of Co2 Fluid Density Calculation Model Based on Grayscale Image

Dong, Yaomin; Wu, Chuansheng; Lv, Qinghe; Li, Hongkui; Guo, Hongjian

doi:10.18280/ijht.330122

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…This is also the imaging method used for the point diagram in the third bars in Table. 1. RGB color format is used [11]. Blue (0, 0, 255) is used to show the water phase, green (0, 255, 0) to show the oil phase and red (255, 0, 0) to show the gas phase.…”

Section: Transformation From Attribute Value Of Node To Attribute Valmentioning

confidence: 99%

Research of Imaging Interpretation Model of CAT Logging Data

Yong¹,

Li²

2016

IJHT

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The capacitance array tool (CAT) uses twelve probes distributed symmetrically to measure the response at different azimuths in the wellbore. It is especially suitable to measure highly-deviated wells and horizontal wells, and can intuitively reflect the phase distribution of fluid in the wellbore to image the logging information. This paper considers the dynamic subdivision of instrument rotation, and an imaging algorithm based on the modified Gaussian weighting function is proposed. This algorithm uses different parameters, vertically and horizontally, to adapt to the stratification phenomenon of fluid. In order to improve adaptability, the algorithm introduces the correction coefficient which is determined by using optimization. The results show that the imaging effect coincides well with the corresponding photographs.

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Section: Transformation From Attribute Value Of Node To Attribute Valmentioning

confidence: 99%

Research of Imaging Interpretation Model of CAT Logging Data

Yong¹,

Li²

2016

IJHT

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“…Over the years, many image segmentation methods have been developed to extract BGA solder joints from the X-ray images of printed circuit board (PCB), such as threshold segmentation and edge extraction, to name but a few [5][6][7][8][9][10][11][12]. The X-ray technique is adopted because it is impossible to find the defects in visible light.…”

Section: Introductionmentioning

confidence: 99%

Detection of ball grid array solder joints based on adaptive template matching

Hao¹,

Li²,

Sun³

et al. 2018

IJHT

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This paper aims to achieve the accurate detection of ball grid array (BGA) solder joints. To this end, the author presented an adaptive template matching method for BGA solder joints based on shape detection. First, the region of interest (ROI) was selected from the X-ray image of the printed circuit board (PCB). Then, an edge template was generated through ROI extraction and threshold segmentation, and the direction vector f the edge template was taken as the prior knowledge. After that, the global traversal search was performed on the image pyramid in the top-down manner, aiming to obtain the potential matching targets. Finally, the edges were adjusted by the least squares method to yield the optimal matching results. The proposed method was proved robust, rapid and accurate through an experiment. The research findings shed new light on the BGA solder joint detection and extraction in various conditions.

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“…The combined use of EPI and parallel acquisition technique SENSE can facilitate the scan speed and reduce the scan time to about 1/3 of the time using the conventional method. The combined approach removes the influence of motion artifacts, increases the spatial resolution of the images and ensures the quality of whole-body DWI (Dong et al, 2015;Kwee et al, 2008;Vargas et al, 2010;Yang et al, 2011;Jambawalikar et al, 2010;Tang and Chen, 2016;Zhou et al, 2012). DWIBS is very sensitive to tumor metastases of the whole body and therefore useful for detecting small metastatic foci.…”

Section: Introductionmentioning

confidence: 99%

Application of Diffusion Weighted Imaging with Background Body Signal Suppression in Brain Neurography

Zhang

2018

Neuroquantology

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This study focused on the application of diffusion weighted imaging with background body signal suppression (DWIBS) in brain imaging. Diffusion weighted images with high b value were obtained by combining short T1 inversion recovery, sensitivity encoding technique and echo-planar imaging. Without reducing the signal-to-noise ratio (SNR), the acquisition time of unilateral motion probing gradients (MPGs) DWIBS sequences was controlled within 3 min. The sequences were then compared against the conventional 2D fat-suppressed T2WI. The proposed method enabled the combined use of DW-MR sequences and conventional MR sequences. For this reason, DWIBS is the most popular imaging technique so far, which facilitates the scan speed and reduces the scan time to about 1/3 of the time using conventional technique. Moreover, DWIBS can remove the influence of motion artifacts and increase the spatial resolution of images. By reducing background noises, DWIBS increases the image contrast and the quality of 3D whole-body diffusion weighted images.

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Study of Co2 Fluid Density Calculation Model Based on Grayscale Image

Cited by 3 publications

References 7 publications

Research of Imaging Interpretation Model of CAT Logging Data

Research of Imaging Interpretation Model of CAT Logging Data

Detection of ball grid array solder joints based on adaptive template matching

Application of Diffusion Weighted Imaging with Background Body Signal Suppression in Brain Neurography

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