Abstract:

Shore station video analysis based noncontact ocean wave observation is greatly impacted by the accuracy of crest 2D coordinate in a wave image. We present a contour extraction based crest coordinate collection algorithm to compensate such negatives of traditional algorithms as poor accuracy and realtime. We also introduce a collapse function to terminate the invalid coordinate collection. The algorithm only highlights the concerned crest area and records the relationship of adjoined points when precisely collecting the 2D coordinate of every crest. It has higher practicability in relative observation technology.

Key words: non-contact measurement, crest coordinate collection, contour extraction