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Title	UNDERWATER STEREO PHOTOGRAPHY FOR HULL INSPECTION
Accession No	00317539
Authors	Mittleman, J
Corp. Authors / Publisher	Naval Coastal Systems Center
Publication Date	19800200
Description	37 p.
Abstract	A low cost system for taking underwater stereo photographs is described and background information covering the basic mathematics of stereophotography is presented. This system allows divers with no prior experience or skill in underwater photography to take high quality stereo photographs of ship's hulls. The photographs, which cover an area of about 2 inches by 3 inches, show such features as corrosion pits, paint blisters, and fouling organisms in great detail. Elevations or pit depths can be measured with an accuracy of about 1/64 of an inch. Several examples of stereophotographs taken with this system are included in the report. (Author)
TRT Terms	Corrosion ; Defects ; Fouling organisms ; Hulls ; Inspection ; Measurement ; Optical instruments ; Paint ; Photographs ; Seawater ; Stereoscopic cameras ; Underwater photography ; Vision
Other Terms	Cavities; Defects materials; Hull corrosion; Hull inspection; Sea water corrosion; Ship hulls; Stereophotography; Stereoscopes; Underwater inspection; Visual inspection
Subject Areas	M23 STRENGTH OF MATERIALS AND STRUCTURAL ANALYSIS
Report Number	NCSC-TM-260-80 Tech Memo
Availability	National Technical Information Service Order Number: AD-A081322/0
Document Source	National Technical Information Service Source Data: u8013
TRIS Files	MRIS
Database	TRIS Online

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