1. A system for recognizing a fingerprint ridge, the system comprising: a ridge direction extracting unit configured to extract a longitudinal direction of a ridge from said fingerprint image; a false feature analyzing unit configured to classify a plurality of valleys into true valleys and pores based on an analysis of a pore feature pattern of said plurality of valleys in a direction crossing to said longitudinal direction; a pore density correcting unit configured to generate a corrected image data by approximating densities of pixels classified into said pores close to a density of a ridge of said fingerprint image; a true valley area extracting unit configured to extract a true valley area in which a rate of pixels belonging to said true valley is higher than a predetermined condition as a true valley area; and a true valley accentuating unit configured to correct a density of a pixel belonging to said true valley area to a density of a pixel that is in a neighboring area and has a higher density, wherein said pore feature pattern includes an average value of densities of nearby pixels arranged in said longitudinal direction, an accumulated value of differences between adjacent pixels, or a white pixel radius being a maximum radius of a circle including only pixels belonging to said true valleys and centered at a focused pixel located in said plurality of valleys.