Feature extraction method of ship direction from optical remote sensing image based on coordinate rotation minimum circumscribed rectangle

Abstract

The invention discloses an optical remote sensing image ship direction feature extraction method based on a coordinate rotation minimum enclosing rectangle. The method employs a rotation coordinate axis, and obtains the direction, length and width of a target efficiently and accurately through extracting the minimum enclosing rectangle of a ship. The method comprises the steps: firstly carrying out the image preprocessing, and obtaining a single-pixel edge of the target as an effective reference region of target direction feature extraction; 2, carrying out the initial judgment of the direction of the target through quadrant dividing according to an obtained edge contour image, wherein the purpose of step 2 is to limit the search range of the minimum enclosing rectangle, and to improve the efficiency of an algorithm; 3, searching the minimum enclosing rectangle in the range under the constraint of the target initial judgment range at the former step, and carrying out the initial judgment of the direction of a ship head through the minimum enclosing rectangle; finally extracting the ship direction related features (target length, width and direction) through the obtained minimum enclosing rectangle.

Description

technical field [0001] The invention relates to a ship direction feature extraction method of an optical remote sensing image based on a minimum circumscribed rectangle of coordinate rotation. Background technique [0002] In recent years, with the rapid development of space-borne platform technology, space remote sensing technology has also been continuously improved and improved. The research and technology development of ship detection and monitoring using the acquired remote sensing images has received more and more attention in the field of marine remote sensing. Pay attention to. [0003] The feature extraction of ship direction from optical remote sensing image refers to the extraction of ship direction features based on optical remote sensing image data by means of image processing. This technology can cooperate with automatic detection technology to realize automatic and effective extraction of ship information from remote sensing data. It is applied in the civilia...

AI Technical Summary

Problems solved by technology

This kind of traditional method of calculating the long axis and short axis of the connected area to obtain the direction characteristics of the ship is vulnerable to the integrity of the connected area mark calculation and the interference of a small number of false alarm points around the target, and uses the method of traversing the target area to find the long and short axes to obtain the direction Large amount of computation and low efficiency

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