Fingerprint image enhancement by pixel-parallel processing

Adaptive fingerprint image enhancement with fingerprint image quality analysis

“…Fig. 6 shows a preprocessing method appropriate to image quality characteristics [11]. That is, ridges are enhanced in dry images and valleys are enhanced in oily images.…”

“…For dry images, ridges are enhanced by extracting their centerlines and removing white pixels (ridge enhancement) [11]. Most of the fingerprint identification systems preprocess images without considering their characteristics as shown in Fig.…”

Edge distance extraction and orientation invariant transform for object recognition

“…The technique used is -directional signal (Bazen & Gerez, 2002), line shape analysis (Chang & Fan, 2002;Han, 2004;Ma, YingLiang, Pollick, Frank, & Hewitt, 2004;Sun & Qiu, 2004), Gabor filter (Lee et al, 2001), singular point detection (Ramo & Tico, 2001), Wavelet transform (Hsieh, Lai, & Wang, 2003), dilate enhancement (Ikeda & Nakanishi, 2002;Randolph & Smith, 2001), r-theta transformation (Chen, 1996), thermal sensor technique (Lin & Fan, 2004), and two band decomposition (Shah & Sastry, 2003). In this research, the distances of the edges to the centroid are found.…”

Adaptive Enhancing of Fingerprint Image with Image Characteristics Analysis

“…Fig. 4 shows a preprocessing method appropriate to image quality characteristics [3]. That is, ridges are enhanced in dry images and valleys are enhanced in oily images.…”

“…For the dry images, ridges are enhanced by extracting their center lines and removing white pixels (ridge enhancement process) [3]. Most of the fingerprint identification systems preprocess images without considering their characteristics.…”