how can structured noise be eliminated from latent fingerprints

When I extract texture component from the latent fingerprint,the structured noises such as characters and numbers is not removed from the latent fingerprint. I need to extract only the fingerprint content from the image leaving the structured noises as cartoon component. Is there any better method for doing the same.

[Walter Roberson]

Merged into duplicate http://uk.mathworks.com/matlabcentral/answers/231417-is-there-any-better-way-to-remove-structured-noises-from-latent-fingerprints