Iterative total least-squares image reconstruction algorithm for optical tomography by the conjugate gradient method

1997 ◽  
Vol 14 (4) ◽  
pp. 799 ◽  
Author(s):  
Wenwu Zhu ◽  
Yao Wang ◽  
Yuqi Yao ◽  
Jenghwa Chang ◽  
Harry L. Graber ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Least Squares ◽  
Conjugate Gradient Method ◽  
Conjugate Gradient ◽  
Gradient Method ◽  
Optical Tomography ◽  
Reconstruction Algorithm ◽  
Total Least Squares ◽  
Image Reconstruction Algorithm

scholarly journals The conjugate gradient method

2018 ◽  
Vol 37 (4) ◽  
pp. 296-298 ◽  
Author(s):  
Karl Schleicher
Keyword(s):  
Least Squares ◽  
Conjugate Gradient Method ◽  
Conjugate Gradient ◽  
Gradient Method ◽  
Waveform Inversion ◽  
Linear Inversion ◽  
Large Computer ◽  
Traveltime Tomography ◽  
Full Waveform ◽  
Least Squares Migration

The conjugate gradient method can be used to solve many large linear geophysical problems — for example, least-squares parabolic and hyperbolic Radon transform, traveltime tomography, least-squares migration, and full-waveform inversion (FWI) (e.g., Witte et al., 2018 ). This tutorial revisits the “Linear inversion tutorial” ( Hall, 2016 ) that estimated reflectivity by deconvolving a known wavelet from a seismic trace using least squares. This tutorial solves the same problem using the conjugate gradient method. This problem is easy to understand, and the concepts apply to other applications. The conjugate gradient method is often used to solve large problems because the least-squares algorithm is much more expensive — that is, even a large computer may not be able to find a useful solution in a reasonable amount of time.

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