UTSig: A Persian Offline Signature Dataset
This provides a specialized dataset for Persian signature verification, which is incremental as it builds on existing datasets by adding more samples and cultural specificity.
The authors introduced UTSig, a new Persian offline signature dataset containing 8280 images from 115 classes, addressing the lack of culture-dependent datasets for signature verification. They found that training with genuine, opposite-hand, and random forgeries improved performance, reducing equal error rate and minimum cost of log likelihood ratio.
The pivotal role of datasets in signature verification systems motivates researchers to collect signature samples. Distinct characteristics of Persian signature demands for richer and culture-dependent offline signature datasets. This paper introduces a new and public Persian offline signature dataset, UTSig, that consists of 8280 images from 115 classes. Each class has 27 genuine signatures, 3 opposite-hand signatures, and 42 skilled forgeries made by 6 forgers. Compared with the other public datasets, UTSig has more samples, more classes, and more forgers. We considered various variables including signing period, writing instrument, signature box size, and number of observable samples for forgers in the data collection procedure. By careful examination of main characteristics of offline signature datasets, we observe that Persian signatures have fewer numbers of branch points and end points. We propose and evaluate four different training and test setups for UTSig. Results of our experiments show that training genuine samples along with opposite-hand samples and random forgeries can improve the performance in terms of equal error rate and minimum cost of log likelihood ratio.