Filtering method for sea surface stripe noise and sea surface stripe cloud in moderate resolution imaging spectroradiometer (MODIS) remote sensing image

Abstract

The invention discloses a filtering method for sea surface stripe noise and sea surface stripe cloud in a moderate resolution imaging spectroradiometer (MODIS) remote sensing image. An original image of the MODIS remote sensing image in the same region and the same period is read from a hierarchical data format (HDF) file; the histogram equalization processing is performed for the original image; the image which is subjected to the histogram equalization processing is divided into sub-images with 300300 pixels; average gray values of all sub-images are evaluated; and thresholds are selected, pixels which are smaller than thresholds are pixels of the stripe cloud or the stripe noise, and pixels which larger than thresholds are pixels of a sea surface or a sea internal wave. The sea surface stripe noise and the sea surface stripe cloud in the MODIS image in a certain region and a certain period can be effectively filtered in a short time, basic information of the sea internal wave in the MODIS image can be effectively reserved, the method is simple and the processing efficiency is high.

Description

technical field [0001] The invention relates to an image preprocessing method in the field of MODIS remote sensing image processing, in particular to a method for filtering sea surface strip noise and strip cloud. Background technique [0002] MODIS (Moderate Resolution Imaging Spectroradiometer, Moderate Resolution Imaging Spectroradiometer) is an optical remote sensing instrument mounted on terra and aqua satellites. It is the only one on the satellite that directly broadcasts real-time observation data to the world through the x-band, and is free of charge. Spaceborne instruments that receive data and use them free of charge. Many countries and regions around the world are receiving and using MODIS data. NASA provides free data. my country has established multiple ground receiving stations for MODIS remote sensing images. MODIS has the advantages of large imaging range and low noise, and is very suitable for large-scale research of ocean internal waves, because the sun's i...

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Problems solved by technology

These two types of factors also have strong texture features, which will have a great impact on the identification of internal waves

[0008] Therefore, before extracting the texture features of ocean internal waves, in order to reduce the interference of these noises, these noises must first be filtered to minimize the interference caused by them. At present, multiple remote sensing images in the same area and at different times are used. Perform conventional noise removal cloud processing, the processing efficiency is low and the processing effect is poor

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