IEEE Trans Image Process - Curved-region-based ridge frequency estimation and curved Gabor filters for fingerprint image enhancement.

Tópicos

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Resumo

Gabor filters (GFs) play an important role in many application areas for the enhancement of various types of images and the extraction of Gabor features. For the purpose of enhancing curved structures in noisy images, we introduce curved GFs that locally adapt their shape to the direction of flow. These curved GFs enable the choice of filter parameters that increase the smoothing power without creating artifacts in the enhanced image. In this paper, curved GFs are applied to the curved ridge and valley structures of low-quality fingerprint images. First, we combine two orientation-field estimation methods in order to obtain a more robust estimation for very noisy images. Next, curved regions are constructed by following the respective local orientation. Subsequently, these curved regions are used for estimating the local ridge frequency. Finally, curved GFs are defined based on curved regions, and they apply the previously estimated orientations and ridge frequencies for the enhancement of low-quality fingerprint images. Experimental results on the FVC2004 databases show improvements of this approach in comparison with state-of-the-art enhancement methods.

Resumo Limpo

gabor filter gfs play import role mani applic area enhanc various type imag extract gabor featur purpos enhanc curv structur noisi imag introduc curv gfs local adapt shape direct flow curv gfs enabl choic filter paramet increas smooth power without creat artifact enhanc imag paper curv gfs appli curv ridg valley structur lowqual fingerprint imag first combin two orientationfield estim method order obtain robust estim noisi imag next curv region construct follow respect local orient subsequ curv region use estim local ridg frequenc final curv gfs defin base curv region appli previous estim orient ridg frequenc enhanc lowqual fingerprint imag experiment result fvc databas show improv approach comparison stateoftheart enhanc method

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