Parametric phase information based 2D Cepstrum PSF estimation method for blind de-convolution of ultrasound imaging

2014 ◽  
Author(s):  
Jooyoung Kang ◽  
Sung-Chan Park ◽  
Jung-ho Kim ◽  
Jongkeun Song
Keyword(s):  
Ultrasound Imaging ◽  
Estimation Method ◽  
Phase Information ◽  
Psf Estimation

scholarly journals A Novel Vital-Sign Sensing Algorithm for Multiple Subjects Based on 24-GHz FMCW Doppler Radar

2019 ◽  
Vol 11 (10) ◽  
pp. 1237 ◽  
Author(s):  
Hyunjae Lee ◽  
Byung-Hyun Kim ◽  
Jin-Kwan Park ◽  
Jong-Gwan Yook
Keyword(s):  
Vital Sign ◽  
Continuous Wave ◽  
Doppler Radar ◽  
Spectral Estimation ◽  
Estimation Method ◽  
Vital Signs ◽  
Phase Information ◽  
Multiple Targets ◽  
Wave Radar ◽  
24 Ghz

A novel non-contact vital-sign sensing algorithm for use in cases of multiple subjects is proposed. The approach uses a 24 GHz frequency-modulated continuous-wave Doppler radar with the parametric spectral estimation method. Doppler processing and spectral estimation are concurrently implemented to detect vital signs from more than one subject, revealing excellent results. The parametric spectral estimation method is utilized to clearly identify multiple targets, making it possible to distinguish multiple targets located less than 40 cm apart, which is beyond the limit of the theoretical range resolution. Fourier transformation is used to extract phase information, and the result is combined with the spectral estimation result. To eliminate mutual interference, the range integration is performed when combining the range and phase information. By considering breathing and heartbeat periodicity, the proposed algorithm can accurately extract vital signs in real time by applying an auto-regressive algorithm. The capability of a contactless and unobtrusive vital sign measurement with a millimeter wave radar system has innumerable applications, such as remote patient monitoring, emergency surveillance, and personal health care.

Ultrasound Imaging Using Spatial Domain Phase Information

2015 ◽  
Vol 742 ◽  
pp. 118-122
Author(s):  
Liu Yang ◽  
Chun Guang Xu ◽  
Xin Liang Li ◽  
Ye Huang
Keyword(s):  
Ultrasound Imaging ◽  
Time Of Flight ◽  
Measuring Method ◽  
Spatial Domain ◽  
Guided Wave ◽  
Ultrasonic Transducers ◽  
Phase Information ◽  
Flight Data ◽  
Ultrasound Radiation ◽  
Domain Phase

The aim of this paper is to determine the efficacy of the ring-shaped array used for imaging the objects inside the array. Hyperbola algorithm and ellipse algorithm which are conventionally used in the field of guided wave for locating the defects are developed and combined here to extract the image. Meanwhile, much more phase information is added in this process. Fan-shaped ultrasound radiation is generated separately by the 45 rectangular ultrasonic transducers which are circular embedded in the wall of a container. The time of flight data and the attenuation data are obtained and stored in the A-scan wave of each receiving transducer, subsequently, they are applied for reconstructing the image of all tested objects. The validity of the combined measuring method with phase information is demonstrated by imaging the distributed polyurethane objects.

scholarly journals Optimal PSF Estimation for Simple Optical System Using a Wide-Band Sensor Based on PSF Measurement

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3552 ◽  
Author(s):  
Yunda Zheng ◽  
Wei Huang ◽  
Yun Pan ◽  
Mingfei Xu
Keyword(s):  
Image Quality ◽  
Optical System ◽  
Estimation Method ◽  
Wide Band ◽  
Optical Systems ◽  
Blind Estimation ◽  
Image Deconvolution ◽  
Color Channel ◽  
Spread Function ◽  
Psf Estimation

Simple optical system imaging is a method to simplify optical systems by removing aberrations using image deconvolution. The point spread function (PSF) used in deconvolution is an important factor that affects the image quality. However, it is difficult to obtain optimal PSFs. The blind estimation of PSFs relies heavily on the information in the image. Measured PSFs are often misused because real sensors are wide-band. We present an optimal PSF estimation method based on PSF measurements. Narrow-band PSF measurements at a single depth are used to calibrate the optical system; these enable the simulation of real lenses. Then, we simulate PSFs in the wavelength pass range of each color channel all over the field. The optimal PSFs are computed according to these simulated PSFs. The results indicated that the use of the optimal PSFs significantly reduces the artifacts caused by misuse of PSFs, and enhances the image quality.

PSF Estimation Method of Simple-lens Camera Using Normal Sinh-Arcsinh Model Based on Noise Image Pairs

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Dazhi Zhan ◽  
Weili Li ◽  
Xiaoqing Yin ◽  
Caiyun Niu ◽  
Jin Liu
Keyword(s):  
Estimation Method ◽  
Model Based ◽  
Noise Image ◽  
Image Pairs ◽  
Psf Estimation

To: “Higher order autospectra by maximum entropy method”, by R. O. Plaisted and H. G. Peña (GEOPHYSICS, 48, 1409–1410, October, 1983).

Geophysics ◽  
1985 ◽  
Vol 50 (4) ◽  
pp. 742-743
Keyword(s):  
Signal Processing ◽  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Estimation Method ◽  
Difficult Problem ◽  
Entropy Method ◽  
Phase Estimation ◽  
Phase Information ◽  
Nonminimum Phase ◽  
Geophysical Signal

Recently Rosenblatt (1980), Lii and Rosenblatt (1982), and Matsuoka and Ulrych (1984) developed a phase estimation method for nonminimum phase MA processes by using the bispectrum which contains the required phase information of the wavelet. The computation of the bispectrum is, consequently, of importance in geophysical signal processing, particularly in the difficult problem of wavelet estimation.

Application of Phase Information in Ultrasound Imaging

1984 ◽  
Author(s):  
D.A. Seggie ◽  
S.B. Shin ◽  
S. Leeman ◽  
P.V. Sankar ◽  
L.A. Ferrari
Keyword(s):  
Ultrasound Imaging ◽  
Phase Information

On: Short note “Higher order autospectra by maximun entropy method”, by R. O. Plaisted and H. G. Peña (GEOPHYSICS, 48, 1409–1410, October, 1983).

Geophysics ◽  
1984 ◽  
Vol 49 (12) ◽  
pp. 2196-2197
Author(s):  
Toshifumi Matsuoka ◽  
Tad J. Ulrych
Keyword(s):  
Signal Processing ◽  
Short Note ◽  
Estimation Method ◽  
Difficult Problem ◽  
Higher Order ◽  
Entropy Method ◽  
Phase Estimation ◽  
Phase Information ◽  
Nonminimum Phase ◽  
Geophysical Signal

Recently Rosenblatt (1980) and Lii and Rosenblatt (1982) developed a phase estimation method for nonminimum phase MA processes by using the bispectrum which contains the required phase information of the wavelet. The computation of the bispectrum is, consequently, of importance in geophysical signal processing, particularly in the difficult problem of wavelet estimation.

An efficient sound speed estimation method to enhance image resolution in ultrasound imaging

Ultrasonics ◽  
2009 ◽  
Vol 49 (8) ◽  
pp. 774-778 ◽  
Author(s):  
M.H. Cho ◽  
L.H. Kang ◽  
J.S. Kim ◽  
S.Y. Lee
Keyword(s):  
Ultrasound Imaging ◽  
Sound Speed ◽  
Estimation Method ◽  
Image Resolution ◽  
Speed Estimation
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