As this work focus on the digital glacier image segmentation, then change detection in different time SAR images. In pre-processing work has remove the noise of the input image which was due to the fog, or sand etc. which can be consider as the natural environment noise.
As any research is based on data and each data has to be preprocess first. This is common step for different kind of research. In this step image act as the input data and pre-processing is done by reading the image into matrix form. This can be understand as transforming image pixel color into corresponding pixel format value.
Let us consider an 2x2 dimension image it means have four pixels. Two pixel in each row. So read an image will transform image into same 2x2 dimension matrix having four value represent color of the pixel.
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