Method and device for obtaining dynamic threshold value of cloud detection characteristic parameters of remote sensing images
A feature parameter and remote sensing image technology, applied in image data processing, image analysis, image enhancement, etc., can solve the problems of low processing efficiency and low accuracy, and achieve the effect of improving accuracy and high processing efficiency
Active Publication Date: 2020-10-23
CHINA AGRI UNIV
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However, in the existing cloud detection methods, the threshold is often selected by visual comparison effect, which not only has low processing efficiency, but also has low accuracy.
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[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0021] It should be clear that the method provided by the present invention is applicable to satellites capable of acquiring blue bands, green bands, red bands and infrared bands, which may include but not limited to Gaofen-1 (GF-1) satellite, Landsat8 satellite and Sentinel-1 satellite, etc. . For the convenience of brief description, this artic...
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The embodiment of the invention provides a dynamic threshold acquiring method and device for cloud detection characteristic parameters of a remote sensing image. The method comprises the following steps: acquiring solar altitude angle of a reference image and the reflectance values of each band; acquiring reflectance values of each band of the central pixel of the reference image; according to thesolar altitude angle, the scale coefficient and the correction coefficient of the remote sensing image to be measured, obtaining the reflectance values of each band of the central pixel of the remotesensing image to be measured; according to the reflectance values of each band of the reference image, the central pixel of the reference image and the central pixel of the remote sensing image to bemeasured, calculating the corresponding cloud detection characteristic parameters respectively; calculating the difference between the cloud detection feature parameters of the reference image and the central pixel of the reference image, and obtaining the threshold value of each cloud detection feature parameter of the remote sensing image to be measured. The embodiment of the invention synthesizes the thresholds of the three cloud detection characteristic parameters by introducing the solar altitude angle parameters, thereby obtaining a dynamic threshold, having high processing efficiency and remarkably improving the accuracy of cloud detection.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of remote sensing image processing, and in particular to a method and device for acquiring a dynamic threshold value of cloud detection characteristic parameters of remote sensing images. Background technique [0002] With the development of modern remote sensing, remote sensing images are widely used in crop classification and yield estimation, disaster dynamic monitoring, environmental monitoring, and land planning and utilization due to their high imaging definition, objective and rich information, timeliness and practicality. and other fields. [0003] Due to the influence of weather conditions, many remote sensing images are inevitably covered with a large number of clouds. In order to improve the utilization of images, it is necessary to perform cloud detection in the image preprocessing stage. In the cloud detection method, the selection of the threshold is a very important part...
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IPC IPC(8): G06T7/00
CPCG06T7/0002G06T2207/10036G06T2207/30192
Inventor 朱德海王媛熊全刘帝佑张晓东杜振博叶思菁黄健熙苏伟张超刘哲
Owner CHINA AGRI UNIV