But even with the fingerprint, the difficulty of identification and analysis remains significant.
A fingerprint left by the same finger on a third of its surface, with blurred edges and ridges pressed together due to pressure.
It looks like five different fingerprints; this is the most challenging fingerprint Lu Chuan has encountered so far for identification and analysis.
This time, simple numerical-to-image conversion and image-to-numerical conversion can't effectively pre-process the fingerprint.
Therefore, Lu Chuan used a combination of spatial domain algorithms and frequency domain algorithms.
In image enhancement technology, frequency domain algorithms process images in a two-dimensional digital format, converting the visible 3D image into a 2D digital format.
The techniques used here are primarily basic methods like Fourier transform.
