This document discusses methods for detecting linear structures in ASTER satellite images through image preprocessing techniques. It proposes using the Brightness Preserving Dynamic Fuzzy Histogram Equalization (BPDFHE) method and Isotropic Undecimated Wavelet transform (IUWT) for contrast enhancement and effective denoising of ASTER images. BPDFHE preserves brightness while enhancing contrast. IUWT is used to segment texture features like lineaments. The combination of BPDFHE for preprocessing and IUWT for segmentation provides better results for extracting linear structures and intersections from ASTER dataset images compared to other methods.