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... nt even more time.
In more than an hour, he merely restored the original fingerprint, yet the lines still remained unclear, making it difficult to mark characteristic points.
Afterwards, Lu Chuan successively used gradient methods, operators, high-pass filtering, mask matching, statistical difference methods, and so on, to enhance the image, eventually obtaining a fingerprint that could allow characteristic points to be marked.
And during this whole operation, those behin ...
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