Peningkatan Kualitas Citra Sidik Jari menggunakan FFT (Fast Fourier Transform)
| Main Author: | Salahuddin |
|---|---|
| Other Authors: | Tulus, Fahmi |
| Format: | Masters |
| Bahasa: | ind |
| Subjects: | |
| Online Access: |
http://repository.usu.ac.id/handle/123456789/37298 |
Daftar Isi:
- Biometric technology has several advantages, such as it cannot be easily lost, cannot be falsified, and cannot be easily broken. The system of identifying fingerprint is aimed to identify someone’s fingerprint so that his uniqueness can be identified. The result of the extraction of fingerprint entirely depends on the quality of the fingerprint image itself and on the quality of the fingerprint image related to the clarity of the ridge structure of the fingerprint. Good image will have good contrast and will describe ridges and valleys properly. There are some reasons why a fingerprint is not good; one of them is that there is a hold or a cut which causes the ridges not to continue (cut off). The type of fingerprint with environmental condition is defined as greasy fingerprint in which the pixel of ridges tends to be thick, dry fingerprint has locally rough ridges, there are many white pixels/valleys, and neutral or normal fingerprints generally do not have specific characteristics such as greasy and dry. In order to obtain good image on dry image, the ridges should be increased by extracting its diameter and wiping out the white pixels/valleys. One of the methods used to increase the quality of the image is image enhancement; namely, the process of increasing the quality of an image.The study used FFT method since it is one of the algorithms which can compute fast because the system is processed in actual time. With the FFT method, the probability of the fingerprint image with the cut off ridges was analyzed and computed from its ridge frequency and ridge orientation. After its quality was increased by using FFT, the pixel ridge increased from 97.44% to 97.52%. By the result of the verification of fingerprint, it was found that 54.29% was matching at k=0.6
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