Underwater Imaging and Photography

Abstract. The problem and various techniques for underwater imaging have been reviewed. The effect of various design parameters like pulse shape and duration, etc. has been brought out. System design considerations for underwater photogra-phy have also been discussed. 1. Introdoction The search and recovery of sunken ships, submarines, lost atmoic bombs has histo-rically been a tedious, time consuming and expensive task. Using underwater imaging and photography, not only the above tasks but also monitoring tasks such as laying cable, amplifiers and pipe lines in safe positions could be simplified. A combined sonar/TV re-entry system for the offshore oil industry is much useful. The combina-tion of television and sonar images on board the drilling vessel provide immediate and exact positioning information for guidance in the re-entry procedure. The present day side locking sonar system is inherently prone to data interpretation problems leading to a high false target rate and the corresponding necessity of later optical verification of the target contacted. Various techniques have been developed an