**5. Conclusions**

The motivation of this chapter is providing a uniform ROI localization method to extract standard ROI images. This is very meaningful for comparing the new proposed feature extraction and identification algorithms. This also can lower the threshold of the palmprint research for beginners, because preprocessing is very complex and time-consuming. The method used in this chapter is not for real-world applications; it is only a ROI extraction tool for the publicly available databases. According to this goal, the simple method, based on classical digital image processing and machine learning techniques, is selected in this chapter.

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