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A sea wave height measurement method based on stereo vision is proposed in this paper. This method uses two cameras taking photos of sea and calculates the sea wave height with pairs of images . In the step of obtaining 3-D sea wave information in long distance(over 3Km), we proposed a Block extraction method for sea wave extraction and a Multi-constraints sea wave matching method for corresponding points matching . Block extraction extracts sea waves from div i ded block s of sea areas and in each block set thresholds according to the gray scale distribution in each parts. Multi-constraints sea wave matching method matches sea waves with multi constraints and corresponds points based on corresponding sea waves. Experimental results support the applicability of this sea wave extraction method in long distance. Matching results show the correct of the sea wave matching method.

Overcome the Long Distance: A Universal Method for Sea Wave Matching