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Sub-pixel precision SAR image waterline mapping method

A mapping method and sub-pixel technology, applied in image enhancement, image analysis, graphics and image conversion, etc., can solve problems such as unclear boundaries, inaccurate results, and low resolution of SAR images

Active Publication Date: 2019-09-06
HENAN UNIVERSITY
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Problems solved by technology

However, most of them work at the pixel level (such as threshold-based SAR image segmentation methods, gradient-based edge detection methods, and level set segmentation methods). Due to the low resolution of SAR images, the boundaries between different ground objects are not obvious , traditional algorithms can only work at the pixel level, and in some applications, the obtained results are not accurate enough

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  • Sub-pixel precision SAR image waterline mapping method
  • Sub-pixel precision SAR image waterline mapping method
  • Sub-pixel precision SAR image waterline mapping method

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1 As shown, the present invention specifically includes the following steps: Step 1, perform preprocessing on the SAR image, wherein, firstly, perform geometric correction on the SAR image, then perform geocoding on the image, and finally perform normalization on the SAR image. Step 2, perform coherent speckle noise filtering, such as non-local despeckling approach based on Similar Pixels Selected and RatioDistance (NL-SPSRD) coherent speckle filtering algorithm based on distance ratio (NL-SPSRD) for SAR image Carry out coherent speckle noise filtering, use the preprocessed SAR image, and pass through the NL-SPSRD filtering algorithm to filter the coherent speckle noise in the SAR image while maintaining good edge information. Step 3, pixel-level water area extraction, preferably based on Gaussian fuzzy c-means ...

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Abstract

The invention provides a sub-pixel precision SAR image waterline mapping method. The sub-pixel precision SAR image waterline mapping method comprises the steps of preprocessing an SAR image; performing speckle noise filtering on the SAR image; carryihng out pixel-level water area extraction; calculating and extracting sub-pixel-level waterline points; and obtaining sub-pixel-level waterlines through subsection fitting of the sub-pixel-level waterlines. According to the invention, the sub-pixel-level precision water area contour line can be obtained, and the method has important significance for remote sensing water area distribution, measurement, evaluation and prediction.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR) image water area detection, in particular to a sub-pixel precision SAR image waterline mapping method. Background technique [0002] Surface water resources are getting more and more attention. Surface water is an important carrier of water cycle in terrestrial regions and has an important impact on regional ecosystems. Effective research on water area information is of great significance to agricultural irrigation, water resource investigation, and flood disaster forecasting, early warning, and monitoring. At the same time, it has guiding significance for the comprehensive investigation and rational planning and use of water resources. As an active microwave sensor, SAR has the advantages of all-day, all-weather, and long-distance earth observation. Therefore, many researchers use SAR images to segment and extract surface water, so...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/20G06T3/40G06T7/12
CPCG06T5/20G06T3/4007G06T7/12G06T2207/10044G06T2207/20024G06T5/80G06T5/70Y02A90/30
Inventor 李宁郭拯危闵林毋琳赵建辉牛世林
Owner HENAN UNIVERSITY