The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XL-3/W2
https://doi.org/10.5194/isprsarchives-XL-3-W2-211-2015
https://doi.org/10.5194/isprsarchives-XL-3-W2-211-2015
10 Mar 2015
 | 10 Mar 2015

A NOVEL APPROACH FOR EDGE DETECTION OF LOW CONTRAST SATELLITE IMAGES

K. K. Singh, M. K. Bajpai, and R. K. Pandey

Keywords: Sobel Edge Detector, Fractional Order Differentiator, Chebyshev Polynomial based Approximation, Satellite Images

Abstract. Discrimination between texture edges and geometrical edges is very difficult in low contrast images. Satellite images are low contrast images. It is important to extract the edges that are not clearly visible in case of Satellite images. The present work encompasses a new edge detection algorithm using newly constructed differentiator. Chebyshev polynomial based fractional order differentiator has been used for filtering operation on an image. High pass and Low pass filters are designed with the concept of Quadrature Mirror Filter (QMF). Pre-processing has been performed by using this filter. Sobel edge detection method has been applied on this pre-processed image. The algorithm has been tested with two different satellite images.