River Channel Extraction Method Based on Minimum Circumscribed Rectangular Window Channel Segmentation Model in SAR Image

Abstract

The invention discloses an SAR image river channel extracting method based on a minimum circumscribed rectangle window river channel segmentation model. The method comprises the steps that firstly, a histogram equalization method is adopted in an original SAR image to stretch the gray scale contrast ratio; then, a river channel is separated into scattered and even linear stripe-shaped areas, a minimum circumscribed rectangle window is adopted to tightly wrap each segmentation area of the river channel, and approximation of a complex river channel outline type is achieved through the rectangle windows. Threshold functions which are generated by converting a river channel model and used for judging zone boundary confidence coefficients in a graph model are used for optimizing the segmentation result so as to enable the segmentation result to be more suitable for river channel extracting tasks on this basis. Finally, according to the prior experience of the river channel outline, according to the river channel area identification method, the length-width ratio of the rectangle windows is considered, the communication between the rectangle windows is also considered, and the effective identification on the river channel area is achieved. The method can be stably and reliably used for extracting an SAR image river channel, and is particularly suitable for river channel extracting under the complex background or the extremely complex river channel outline.

Description

technical field [0001] The invention relates to a segmentation and recognition method for SAR images, in particular to a method for extracting river channels from SAR images based on a minimum circumscribed rectangular window channel segmentation model, and belongs to the technical field of computer vision. Background technique [0002] With the needs of various routine and emergency monitoring, such as weather forecasting, flood monitoring, etc., more and more high-performance synthetic aperture radars (Synthetic Aperture Rader, SAR) are loaded on various carriers, providing users with rich data And high-quality observation data, as the basis for various later research and judgment. Compared with other types of imaging sensors, the technical advantage of SAR imaging sensors lies in their ability to observe the earth all day and all day and have certain penetration capabilities. At present, with the rapid development of SAR imaging equipment technology, high-resolution SAR ...

AI Technical Summary

Problems solved by technology

Usually the results of threshold segmentation need to go through cumbersome post-processing, and the processing results are not very ideal.

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