Ocean Front Extraction Method Based on Image Segmentation

Abstract

The invention relates to an image segmentation based ocean frontal surface extraction method. The method includes median filtering treatment on a marine hydrologic feature image; utilizing a section growth algorithm and using the magnitude of variable coefficients as a merging principle for performing image segmentation on the marine hydrologic feature image; performing area boundary detection and boundary refining treatment on the segmented image; performing gradient calculation on the marine hydrologic feature image and binarization processing on the gradient image; performing overlapping comparison on the area boundary image and the gradient binarization image and performing frontal surface pixel screening. According to the invention, shortcomings of a prior ocean frontal surface extraction method are overcome. A frontal surface extraction result is insusceptible to noise and is good in continuity and a smoother frontal surface central line can be acquired. The invention provides a basis for fishery production plan making, fishery forecast, marine organism habitat survey, ocean current structure analysis and the like related to ocean frontal surface distribution.

Description

technical field [0001] The invention relates to the fields of remote sensing information technology and physical ocean, in particular to a method for extracting ocean fronts by using digital image processing technology based on satellite remote sensing ocean hydrological element data. Background technique [0002] The ocean front is the interface between two different types of water masses or water systems. The corresponding hydrological elements (such as temperature, chlorophyll concentration, salinity, etc.) at the front change sharply, forming a high gradient area corresponding to the hydrological elements. The seawater at the ocean front gathers, and the vertical movement is strengthened. At the same time, the nutrients carried by the seawater are enriched here, providing rich bait for plankton, fish, etc., so that it is easy to form a good fishing ground. Therefore, the energy exchange between the ocean front and the ocean is closely related to Material transport, marin...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the characteristics of weak edge features in images of marine hydrological elements, the purpose of the present invention is to provide a method for extracting ocean fronts based on image segmentation, which uses median filtering to reduce image noise, and enhances image edges by performing image segmentation on images of marine hydrological elements information and further weaken the image noise, so as to solve the problem that the front extraction results of the traditional sobel algorithm and canny algorithm are greatly affected by noise and poor continuity due to the weak edge features of the image of marine hydrological elements and image noise, and make the front extraction results more accurate. Good continuity, and reduce the occurrence of broken fronts, and at the same time, it can obtain the centerline of the front to further obtain the position information and spatial distribution of the ocean front

Images