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[D-4.3.1 Studies on the Changes in the Coral Reef Environment by Archiving of Under-Water Images]

[Contact Person]

Akira Harashima
Head, Marine Environment Research Team
Global Environment Division. National Institute for Environmental
Studies, Environment Agency,
16-2 Onogawa, Tsukuba, Ibaraki 305, Japan
Phone +81-298-50-2508, Fax +81-298-50-2569
E-mail harashim@nies.go.jp

[Total Budget for FY1994-1996]

25,020,000 Yen (FY1996 8,247,000 Yen)

[Abstract]

　Methods for monitoring the long-term changes in the coral reef ecosystem were developed by taking underwater images and archiving them. Image sampling was done in two ways: A. accessing to the fixed points with quadrat of 1m by 1m and B. ship survey with still and video cameras in a water proof housing for the extensive coverage over the coral reef area. The raw images from still camera, where the quadrat are not always expressed as a square, were digitized and contained in Photo-CDs. Then a geometrical correction algorithm was developed to obtained the normalized images so that the quadrat was transformed to the square. The video data were also digitized by a video capture software. Furthermore, available underwater photographs in the past were collected and processed to CD-ROM archive. The archive thus generated will contribute to the coral reef environmental managements.

[Key Words]

Coral Reef, Under-water Image, Archive, Quadrat, Geometrical Correction