Abstract—The fingerprint segmentation algorithm based on gray

variance can t segment those fingerprint images with high noise.

After analyzing limitation of the fingerprint image segmentation

algorithm based on gray variance, the paper proposes the

improved algorithm to acquire the gray average and gray

variance combining to the basic gray distributing character in the

valid fingerprint image region. Experimental results indicate that

the gray average and gray variance based on the improved

algorithm are more representative of the original information of

the fingerprint image region than the gray variance based on the

classical algorithm. The segmented results of the