Generating fingerprint models

Generating curved fingerprint model

It is possible to generate stl model using the –stl switch. This requires more parameters, first of which is the type of generated fingerprint.

If the mode is set to c, the output model will be a curved finger model, with optional parameters following the filename controlling its shape.

First optional parameter is papilar line height height_line, second is thickness of the model height_base, third the rate of curvature along x axis curv_rate_x and the third is the rate of curvature along y axis curv_rate_y.

• General form for curved stl generation:

$ python3 src/main.py input_file output_file dpi --config config_file preset --stl c height_line height_base curvature_x curvature_y

• Working example curved stl generation:

$ python3 src/main.py res/examples/Palec_P4.tif res/examples/Palec_P4_from_preset.png 600 --config conf/conf.json new_ridge --stl c 2 10 2 2

Generating planar finger model

Using p mode makes the generated fingerprint model flat. Optional parameters are height of the papilar lines and base thickness.

• General command form for planar stl generation:

$ python3 src/main.py input_file output_file dpi --config config_file preset --stl p height_line height_base

• Working example of planar stl generation:

$ python3 src/main.py res/examples/Palec_P4.tif res/examples/Palec_P4_from_preset.png 600 --config conf/conf.json new_ridge --stl p 2 10

Mapping fingerprint to existing finger model

Using m mode modifies the preexisting finger model to contain fingerprint. First optional parameter is papilar line height height_line, second is the number of iterations iter to make the finger mesh denser. Higher number of itertions results in denser finger mesh and better result. The next three parameters are axis offsets for the finger, finger_x, finger_y, finger_z. These control the location of the finger. They need to be set only if the user wants to move core of the print closer to the center of the finger model. The last parameter finger_model allows the user to choose custom finger model.

• General command form for mapped stl generation

$ python3 src/main.py input_file output_file dpi --config config_file preset --stl m height_line iter finger_x finger_y finger_z finger_model

• Working example of finger mapping

$ python3 src/main.py res/examples/Palec_P4.tif res/examples/Palec_P4.png 600 --config conf/conf.json new_ridge --stl m 0.2 2 0 0 0 res/finger_backup/finger.stl