| Popis: |
Plenty of pores can solve the lack of feature points problem on high-resolution partial fingerprints. Pore-based features are similar, so the neighbor ridge features are also taken into account. However, lots of feature points cause heavy computation required. We propose a binary descriptor, Pore-Valley Disk Code (PVDC), which encodes the local structure of a center pore and its neighbor valleys with an eight-section disk. The proposed descriptor is rotational invariant since the first section always aligns to the center pore orientation. Instead of recording pixel by pixel, we find that the direction and distance of intersected valleys in each section can efficiently represent the ridge structure with reduced computation. With the proposed fixed-length binary code, the matching time can be significantly reduced. The proposed method has 160x speedup compared with the state-of-the-art pore-based Sparse Representation based Direct Pore (SRDP) method with reasonable EER in HRF DBI database. |
