This document summarizes a research paper that proposes a two-stage method for enhancing low quality fingerprint images. The first stage uses a ridge-compensation filter in the spatial domain to enhance ridge pixels and reduce non-ridge pixels. The second stage uses polar coordinates and separates filters into radial and angular domains. Local orientation and frequency are estimated based on learning from images. Frequency band pass filtering is then applied using the estimated local orientation and frequency maps. The two-stage approach enhances fingerprint images in both the spatial and frequency domains to improve low quality images.