NDLI: Digital processing of radiographic images

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Digital processing of radiographic images

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bond, A. D. Ramapriyan, H. K.
Copyright Year	1973
Description	Some techniques are presented and the software documentation for the digital enhancement of radiographs. Both image handling and image processing operations are considered. The image handling operations dealt with are: (1) conversion of format of data from packed to unpacked and vice versa; (2) automatic extraction of image data arrays; (3) transposition and 90 deg rotations of large data arrays; (4) translation of data arrays for registration; and (5) reduction of the dimensions of data arrays by integral factors. Both the frequency and the spatial domain approaches are presented for the design and implementation of the image processing operation. It is shown that spatial domain recursive implementation of filters is much faster than nonrecursive implementations using fast fourier transforms (FFT) for the cases of interest in this work. The recursive implementation of a class of matched filters for enhancing image signal to noise ratio is described. Test patterns are used to illustrate the filtering operations. The application of the techniques to radiographic images of metallic structures is demonstrated through several examples.
File Size	20784743
Page Count	210
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19730013408
Archival Resource Key	ark:/13960/t2g78534g
Language	English
Publisher Date	1973-04-01
Access Restriction	Open
Subject Keyword	Radiography Computer Programming Digital Techniques Data Processing Pattern Recognition Digital Filters Image Enhancement Computer Programs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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