A Measurement Method Based on Labelled Feature from Underwater Images

Abstract

The technique of underwater measurement has been widely used in practice. Focusing on the application of track laying underwater, a measurement method from underwater images, for outputting the dislocation information of two adjacent tracks, is described in this paper. Firstly, a triangle tag which is easy to detect is designed to overcome the disadvantages of underwater images such as low contrast and strong noise; secondly, image thinning of the tag is acquired by morphological operators; thirdly, the measurement features are extracted from the thinning result; and then the dislocation information is calculated by the corresponding measurement features of two adjacent tracks at last. Many practical images are used to verify the performance of the proposed method.