Message-Id: <mailto:199503211553.JAA26930@library.wustl.edu> Date: Tue, 21 Mar 1995 16:43:23 +0200 From: Frank Heindoerfer <mailto:Frank.Heindoerfer@MASCH-BAU.UNI-MAGDEBURG.DE> Subject: Re: Help: Non linear deconvolution To: Multiple recipients of list IMAGELIB
On Mon, 20 Mar 1995, AIIM Resource Center wrote:> Frank Heindoerfer:
>
> I have never even heard of nonlinear deconvolution. However, if you
> present the term to me in context, I am willing to invesitgate and get
> back to you, hopefully, with an answer...Jackie Virando, AIIM Resourcxe
> Center Library, 1100 Wayne Avenue, Silver Spring, MD 20910 -
> mailto:rescntr@capcon.net - Tel:301/587-8202 - Fax: 301/587-2711.
>
Hello Jackie,
Many thank for your response. Here is a short description of the problem.
I work at our university in the non-destructive testing department. For instance we inspect metallic materials for surface cracks. One inspection method is the eddy current technique.
The point spread function of this probe differs significantly from known probes used in image generating. Mostly, these point spread functions do not depend on the object under test and have a bell-shaped form. In difference, the point spread function of our eddy current probe is a difference probe (gradient probe) and has a positive and a negative maximum. Today I post you a short publication with more detailed information.
The form of the point spread function depends on many parameters like distance between probe and surface, test frequency, conductivity and permeability of the material.
My two questions are:
1. Have you ever seen a point spread function with a positive and a negative maximum? The area square under this function cannot be normalize to 1.
2. How to manage the dependency of the point spread function from the objects parameters?
Thanks for your help.
Frank
Frank Heind”rfer "Otto-von-Guericke-Universitaet" Magdeburg Institut fuer Werkstofftechnik und Werkstoffpruefung PF 4120 D-39106 Magdeburg GERMANY