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Description:

bob.hobpad2.chapter19 1.0.1

A Cross-database Study of Voice Presentation Attack Detection
This package is part of the signal-processing and machine learning toolbox
Bob. It is a software package to reproduce “A Cross-database Study of Voice Presentation Attack Detection” Chapter 19 of “Handbook of Biometric
Anti-Spoofing: Presentation Attack Detection 2nd Edition”
We use conda to manage the software stack installation. To install this
package and all dependencies, first install conda, and then run the
following command on your shell:
$ conda create --name hobpad2-chapter19 --override-channels -c https://www.idiap.ch/software/bob/conda -c defaults python=3 bob.hobpad2.chapter19
$ conda activate hobpad2-chapter19
(hobpad2-chapter19) $ #type all commands inside this "activated" environment

Note
At the present time, Bob only offers support to Linux and MacOS operating
systems. Windows installations are not supported.

Score files to reproduce the results of the chapter
Due to the large number and size of score files, some of them need to be downloaded and the rest were archived and need to be unzipped. Please follow these steps to prepare the scores, so that error rates and figures used in the chapter can be computed:

Unzip pad_handcrafted.zip and pad_megafusion.zip files locate in the scores’ folder into respective `pad_handcrafted and pad_megafusion subfolders.
Download and unarchive some of the scores of handcrafted features-based PAD systems:

cdscores wget http://www.idiap.ch/resource/biometric/data/interspeech_2016.tar.gz
tar−xzvfinterspeech2016.tar.gz Add these score files inside pad_handcrafted folder

Download and unarchive scores for CNN-based PAD systems:

cdscores wget http://www.idiap.ch/resource/biometric/data/isba2018-pad-dnn.tar.gz
tar−xzvfisba2018−pad−dnn.tar.gz Rename the obtained scores folder into pad_cnn folder

Reproducing the results of the chapter
To compute error rates presented in Tables 5 and 6 of the chapter on performance of PAD systems based on handcrafted features, the following script should be used:

$ ./compute_handcrafted_results.sh

The script will create a folder for each configuration of PAD system and datasets. The folders contain DET curves for each given configuration, histograms of score distributions, and error rates. The script also creates a text file ‘latex_table_handcrafed_stats_eer.txt’ which contains a LaTeX formatted table with the results from Table 6 and 6.
To compute error rates presented in Table 7, run the script that is installed with bob.measure using the following:

$ bob_eval_threshold.py -c eer ../scores/pad_megafusion/corresponding_folder/scores-dev

To compute error rates presented in Tables 10 and 11 and Figure 6 of the chapter on performance of CNN-based PAD systems, the following script should be used:

$ ./compute_cnn_results.sh

The script will create a folder for each configuration of PAD system and datasets. The folders contain DET curves for each given configuration (subset of these plots are shown in Figure 6 of the chapter), histograms of score distributions, and error rates. The script also creates a text file ‘latex_table_cnn_stats_eer.txt’ which contains a LaTeX formatted table with the results from Table 10 and 11.
To compute error rates for different types of attack as presented in Table 12, please execute the following script:

$ ./compute_results_cnn_per_attack.sh

The script will compute error rates for each type of attack of voicePA and BioCPqD-PA databases used in the paper and produce ‘latex_table_cnn_per_attack_stats_eer.txt’ file with LaTeX formatted table that has results from Table 12.

Contact
For questions or reporting issues to this software package, contact our
development mailing list.