A question about 2D Iterative Image Reconstruction Using the Adjoint Example

(2 posts) (2 voices)

wang mengxiao

Member
Joined: Oct '17
Posts: 11

Hi all,
I have a question about 2D Iterative Image Reconstruction Using the Adjoint Example. How to set the step length in this example? Thank you very much.

Sincerely,
Mengxiao

Posted 5 years ago #
bencox

Developer
Joined: Mar '10
Posts: 285

Hi Mengxiao,

Good question. You could choose it by trial-and-error, ie. experience. Or you could choose it by using a line search at each iteration, as mentioned in the example (see here), although that will require extra valuations of the forward model. In this paper, we set the step-size by estimating a Lipschitz constant.

Best wishes,
Ben

Posted 5 years ago #

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