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Green tide information extraction method

A technology of information extraction and green tide, applied in the field of remote sensing image processing, can solve problems such as impact, low computational efficiency, and failure to meet requirements

Active Publication Date: 2016-03-23
国家海洋局北海预报中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hazards of the green tide mainly include the following points: First, Enteromorpha floating on the sea consumes a large amount of oxygen, causing organisms covered by Enteromorpha under the sea surface to affect growth and development or even die due to lack of oxygen; second, the deposition of substances secreted by Enteromorpha Going to the bottom of the sea affects the growth and development of seabed organisms; third, Enteromorpha covers the fishery breeding base near the shore, causing the production reduction or even death of the cultured marine animals and plants, which brings huge property and spiritual losses to the farmers; Seaside tourism, vacations and sea sailing competitions have caused serious impacts, destroying the tourism image of coastal cities and reducing government revenue; at present, the main monitoring methods for Enteromorpha green tide include satellite remote sensing, aircraft, ships and land-shore patrols. Satellite remote sensing has With the advantages of wide monitoring range, high temporal and spatial resolution and various monitoring methods, it has become the main method of monitoring green tide of Enteromorpha enteromorpha. The green tide monitoring results obtained by satellite remote sensing are used for rapid analysis, identification and interpretation, and the interpretation results are sent to the Relevant departments report to provide decision makers with cutting-edge monitoring and analysis results so that they can formulate countermeasures in a timely manner to minimize the impact of Enteromorpha green tide disasters on society, which has important social significance; green tide information extraction in the interpretation process Directly affect the generation of follow-up statistical analysis and interpretation reports and the forecasting and early warning work
The green tide information extraction in the prior art mainly adopts the method of visual interpretation and manual threshold setting. Although this method is simple to operate, it relies on expert knowledge, and human factors cause the problem of poor accuracy and instability of the results, and When the brightness of the satellite remote sensing image has a large difference, it is necessary to set multiple thresholds to extract separately. Each pixel participates in the calculation of the band, and the calculation efficiency is low. When the green tide breaks out on a large scale, it cannot meet the requirements.

Method used

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Embodiment 1

[0036] The green tide information extraction method involved in this embodiment is completed with the help of computers and satellite remote sensing images. The process includes screening and preprocessing data sources, calculating and determining the range of green tides, cropping images of irregular green tide ranges, extracting green tide information and quantifying There are five steps to calculating the green tide area:

[0037] (1) Screening and preprocessing data sources: In clear weather, few clouds, no rain, and no typhoon, obtain sea area satellite remote sensing images according to conventional methods, and filter less noise, high definition, uniform brightness, and image resolution less than It is equal to 30 meters and can cover the image of the green tide area, and perform geometric correction and image mosaic preprocessing on the selected image data to complete the screening and preprocessing of the data source;

[0038] (2) Calculate and determine the range of ...

Embodiment 2

[0067] The steps of the method for extracting green tide information involved in this embodiment are the same as in Example 1, and the green tide information obtained by it is obtained using traditional manual discrimination and the threshold method of setting to obtain the data parameters of green tide information in Table 1; based on the variational model The data parameters of the green tide information obtained by the quantitative method are shown in Table 2. The time in Table 1 and Table 2 is the working time from the start of the green tide information extraction to the total area of ​​the green tide information, based on the variational model and the quantitative method. The total area of ​​α is slightly different depending on the initial parameters. Among them, the value of α affects the operating efficiency and is the key initial parameter. Analysis of Table 1 shows that the total area of ​​green tide information extracted when the NDVI threshold is -0.17 (51.0678) is ...

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Abstract

The invention belongs to the technical field of remote sensing image processing, and relates to a green tide information extraction method. The method comprises: obtaining a sea area satellite remote sensing image with a conventional method, screening images of green tide regions, and performing preprocessing operations of geometric correction and image mosaicking; calculating and determining a green tide range by adopting a normalized difference vegetation index; cutting a region of interest in any shape to generate an irregular image file containing the green tide regions; extracting green tide information by adopting a split Bregman fast projection algorithm of a variational level set two-phase image segmentation based Chen-Wees model; and finally, quantitatively calculating the green tide regions by adopting a quantitative formula. The image segmentation based variational model accurately extracts and quantifies the green tide information on the satellite remote sensing image, so that a conventional manual threshold method can be completely replaced and operational application can be realized; and method is scientific and reasonable in principle, low in human factor quantity, high in calculation speed, accurate and stable in result, high in operability, friendly in application environment, high in practicality and easy to popularize.

Description

Technical field: [0001] The invention belongs to the technical field of remote sensing image processing, and relates to a method for extracting green tide information, which uses a variational model of image segmentation to extract green tide information on satellite remote sensing images and quantizes the extraction result. Background technique: [0002] Enteromorpha is a genus of Ulvaceae of Chlorophyta Chlorophyceae, also called moss and moss. It grows in the sea. The algae are bright green and the plants are very slender. Like land plants, they contain chlorophyll a and b. To the naked eye it appears as a green filament with many branches. Enteromorpha itself is non-toxic and can even be eaten. Residents in Jiangsu and Zhejiang areas of China will breed Enteromorpha on a small scale and eat Enteromorpha products on a small scale near the coast; It is called Enteromorpha green tide, or green tide for short. The hazards of the green tide mainly include the following poin...

Claims

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T2207/10032G06T2207/30188
Inventor 张永梅
Owner 国家海洋局北海预报中心
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