A new Methodology of Contrast Enhancement for Satellite Images

Abstract: Contrast Enhancement is a technique of enhancing the contrast level of the images such that the brightness of the image is preserved. The images takes from the satellite are sometimes seems to be not very bright and may contains noisy pixels. So here a new methodology is adopted to improve the contrast of such satellite images. Although there are various schemes implemented for to improve the contrast level of satellite images, but here the contrast enhancement is done using the fusion of the canny edge of the images and adaptive intensity transfer function of the image on low intensity of the image where the contrast is low detected using DWT transformation. The main idea is to transform the satellite image into subbands where the low subband is further processed to increase the contrast of the pixels, the low intensity pixels are detected using canny edge detector and adaptive intensity function is used to increase the intensity of pixels, the enhanced pixels are then fused with high subband region to make the resultant image.

Keywords: Histogram, privacy preserving, DWT, DCT, Curvelet, Fuzzy Histogram, Gaussian Filter.