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Ship waterline extraction method

An extraction method and waterline technology, applied in image data processing, instrumentation, computing, etc., can solve problems such as complex scenes and uneven illumination

Active Publication Date: 2016-07-06
YANSHAN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a highly applicable ship waterline extraction method that can overcome the problems of uneven illumination and complex scenes in the collected images in natural scenes

Method used

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with accompanying drawing:

[0050] Such as figure 1 Shown, method of the present invention comprises the following steps:

[0051] Step 1, obtain the video of the contact area between the ship and the water surface through the camera, and extract the continuous frame images in the video;

[0052] Step 2, by performing image dynamic registration on the original collected pictures to reduce the impact of the background change of the two frames of images caused by the shaking of the hull; the image dynamic registration algorithm is expressed as follows:

[0053] The image registration algorithm is divided into four steps:

[0054] 2-1. First, binarize the highlighted color area in the image, as shown in formula (1),

[0055]

[0056] where R T , B T , G T Respectively, the red, blue, and green color channel thresholds of the image; AVE T Take the average threshold for the three color channels o...

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Abstract

The invention discloses a ship waterline extraction method. The ship waterline extraction method is combined with an image processing technology, extracts an effective area by the combination of frame-to-frame differences and the preprocessing algorithm of morphological close operation, enhances the intensity of a target area and reduces noise intensity through a threshold value algorithm based on a triangular membership function relationship, and carries out image binarization through a Otsu algorithm. Then, according to the width of an image, a reasonable sampling proportion is selected, the edge points of a water gauge are scanned and extracted from top to bottom, and the sampled edge points are subjected to interpolation processing so as to obtain a real waterline. The ship waterline extraction method has the advantages of wide applicable range, high measurement efficiency and the like, lowers the interference of human factors and reduces manpower, material resources and transaction cost.

Description

technical field [0001] The invention relates to the technical field of water gauge measurement, in particular to a method for extracting a ship's waterline in a natural scene. Background technique [0002] As an important part of water gauge weighing, the accuracy of water line will directly affect the fairness of bulk cargo trading, so the effective detection of water line is very important in the process of water gauge weighing. So far, the method of ship waterline detection is mainly manual identification method. The water gauge surveyor climbs down the hull, observes a section of the water gauge with eyes, and then uses a default method to obtain the final water gauge line. This method is affected by human factors. , its detection accuracy is not high and it is easy to cause disputes. [0003] With the development of computer science and digital image processing technology, the image processing detection method has begun to rise. This method has the advantages of non-co...

Claims

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/0002G06T2207/10016
Inventor 李海滨王晶吴海李雅倩刘爽张强张文明
Owner YANSHAN UNIV
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