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The existence of coral reefs have been beneficial for life of living things in the sea. However, their existence todays is threaten by some factors which can be seen from its color bleaching. This means that coral reefs' level of healthy is decreasing. This is happening in Bunaken National Sea Park North Sulawesi, which is one of tourism destinations in Indonesia. Data used on this research is 40 reef images collected randomly from 10 diving spots around Bunaken. This research will design a system to analyse coral reefs' healthy level using digital image analysis. Reef healthy observation is accomplished based on Coral Health Chart issued by coralwatch.org. Based on the chart, RGB average is calculated using digital image processing and applying least square method to obtain formula in determining coral reefs' healthy level. Furthermore, the 40 coral reef images collected are classified based on regression equation obtained. This system is built in computer application system. Results show that application system using digital image to determine reef healthy level can be used. Healthy level of coral reefs in Bunaken National Sea Park is 72.8184%.

Coral reef’s healthy level measurement system design using digital image processing on Bunaken National Sea Park