Research on Reefs Extraction Method Based on Multi-spectral Remote Sensing

Reefs Extraction from satellite remote sensing images is used widely in maritime safety, marine surveying and marine military. Based on analyzing and processing IKONOS satellite remote sensing data, a reefs extraction algorithm is proposed in this paper, in which principal components analysis transformation is combined with edge enhancement. The principal component analysis transformation is applied for all the four bands of the IKONOS data, and the edge is enhanced by using the sharpened near-infrared image. Then Gauss Laplace operator is used to extract the edge of the reefs. The results show that the proposed method removes the linear correlated redundant information in the multi-spectral bands, and higher extraction accuracy of reefs edge can be obtained. From the view of computational complexity and computational efficiency, this method is also better than other algorithms.