Discriminative Local Feature for Hyperspectral Hand Biometrics by Adjusting Image Acutance
Discriminative Local Feature for Hyperspectral Hand Biometrics by Adjusting Image Acutance
复制标题
通过调整图像锐度进行高光谱手部生物识别的判别性局部特征
DOI:
10.3390/app9194178
复制
发表时间:
2019-10
影响因子:
2.7
通讯作者:
Zhao Shuping
中科院分区:
文献类型:
--
作者:
Nie Wei;Zhang Bob;Zhao Shuping
Image acutance or edge contrast in an image plays a crucial role in hyperspectral hand biometrics, especially in the local feature representation phase. However, the study of acutance in this application has not received a lot of attention. Therefore, in this paper we propose that there is an optimal range of image acutance in hyperspectral hand biometrics. To locate this optimal range, a thresholded pixel-wise acutance value (TPAV) is firstly proposed to assess image acutance. Then, through convolving with Gaussian filters, a hyperspectral hand image was preprocessed to obtain different TPAVs. Afterwards, based on local feature representation, the nearest neighbor method was used for matching. The experiments were conducted on hyperspectral dorsal hand vein (HDHV) and hyperspectral palm vein (HPV) databases containing 53 bands. The results that achieved the best performance were those where image acutance was adjusted to the optimal range. On average, the samples with adjusted acutance compared to the original improved by a recognition rate (RR) of 29.5% and 45.7% for the HDHV and HPV datasets, respectively. Furthermore, our method was validated on the PolyU multispectral palm print database producing similar results to that of the hyperspectral. From this we can conclude that image acutance plays an important role in hyperspectral hand biometrics.
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