NDLI: Two-dimensional phase unwrapping using a block least-squares method

Content Provider	IEEE Xplore Digital Library
Author	Strand, J. Taxt, T. Jain, A.K.
Copyright Year	1992
Abstract	We present a block least-squares (BLS) method for two-dimensional (2-D) phase unwrapping. The method works by tessellating the input image into small square blocks with only one phase wrap. These blocks are unwrapped using a simple procedure, and the unwrapped blocks are merged together using one of two proposed block merging algorithms. By specifying a suitable mask, the method can easily handle objects of any shape. This approach is compared with the Ghiglia-Romero (1994) method and the Marroquin-Rivera (1995) method. On synthetic images with different noise levels, the BLS method is shown to be superior, both with respect to the resulting gray values in the unwrapped image as well as visual inspection. The method is also shown to successfully unwrap synthetic and real images with shears, fiber-optic interferometry images, and medical magnetic resonance images. We believe the new method has the potential to improve the present quality of phase unwrapped images of several different image modalities.
Sponsorship	IEEE Signal Processing Society
Starting Page	375
Ending Page	386
Page Count	12
File Size	669286
File Format	PDF
ISSN	10577149
Volume Number	8
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic resonance imaging Interferometry Magnetic resonance Two dimensional displays Biomedical imaging Phase measurement Pixel Pattern recognition Merging Shape
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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