neilharan / openafis Goto Github PK

Hi
I am trying to run the Extract.py python file in order to generate ISO file from fingerprint image, on Ubuntu 18
an error is occurred:

OSError: cannot load library 'libsgfplib.so': /usr/local/lib/libsgfplib.so: undefined symbol: _ZTVN10__cxxabiv117__class_type_infoE

note that I have already copied the FDx SDK files to /usr/local/lib.

please advise

Hello, first of all thank you for this good work, however I have a couple of queries when making the 1:1 comparison, it gives me a similarity below 30% in most cases. But when I see the matches of the minutiae, they are very similar, what could I be doing wrong?

Loading...
Template 1: size 2976 bytes, #fingerprints 1
Template 2: size 2640 bytes, #fingerprints 1
Template 3: size 2896 bytes, #fingerprints 1

Matching...
Similarity of 1 and 2: 28% [in 531us]

Similarity of 1 and 3: 20% [in 521us]

What would be a good percentage of coincidence, or what would have to be improved for a higher level of similarity?

based on this paper
Minutiae-based Matching Scheme for Fingerprint Identification using the Grassfire Spot Matching

they use 10 minutiae to match fingerprints, we can take this as correct valué for this implementation ?

Fingerprints have usually 20 to 30 minutiae and two fingerprints are considered to be matched if they have more than 10 matched minutiae.

Thanks so much @neilharan

As I was trying to setup and use this project, I noticed there's no support for WSQ files:

• Is support for WSQ files planned in the future?
• If not, could you elaborate on why (if only for learning purposes)?

Hello, when I try to run the extract.py file, this error happens:

File "extract.py", line 104, in
lib = ffi.dlopen('sgfplib')
File "C:\Users\A\anaconda3\lib\site-packages\cffi\api.py", line 150, in dlopen
lib, function_cache = _make_ffi_library(self, name, flags)
File "C:\Users\A\anaconda3\lib\site-packages\cffi\api.py", line 832, in _make_ffi_library
backendlib = _load_backend_lib(backend, libname, flags)
File "C:\Users\A\anaconda3\lib\site-packages\cffi\api.py", line 828, in _load_backend_lib
return backend.load_library(path, flags)
OSError: cannot load library '.\sgfplib.dll': error 0xc1

This is in Windows with sgfpamx, sgfplib & sgwsqlib dll's copied into the current directory.
Any help is appreciated.

I'm trying to run the openafis-cli on some images whose format is (or should be) an ISO 19794-2 FMR

The size of the image is significantly bigger than the ones provided as a test_data in this repo. I'm fairly new to this repo, formats, and standards so I may be missing some important concepts here. Is there a reason for this limitation? (assuming it's a limitation and not a mistake on my end).

➜ du prj/valid/fvc2002/DB1_B/101_2.iso  
100	prj/valid/fvc2002/DB1_B/101_2.iso

➜ ./cli/openafis-cli one-many --f1 /tmp/template.iso --path prj/valid/
OpenAFIS: an efficient 1:N fingerprint matching library (SCALAR)
Build options:
    MaximumLocalDistance: 12
    MaximumGlobalDistance: 12
    MinimumMinutiae: 4
    MaximumConcurrency: 256
    MaximumRotations: 3

====================================================================================================
1:N match

Path: prj/valid/
Template 1: /tmp/template.iso
Load factor: 1
Concurrency: 8
====================================================================================================

Loading...
error: filesize > MaximumLength prj/valid/fvc2002/DB1_B/101_2.iso
error: failed to load prj/valid/fvc2002/DB1_B/101_2.iso

• What's the maximum length?
• Can it be changed?

FWIW, I tried to manually set it to something bigger but it didn't help much 😅

I created a PR with a fix - #2

Hello, I'm unable to convert to ISO format. I have installed all requirements well but getting Exception SGFPM_GetMaxTemplatrSize() returnrd 7.

I Don't understand what this means, there are no answers on google. Please help ASAP.

I tested matcher with iso files, generated from our private fingerprint database and it does not work with SecuGens free SDK. I tried finding a match in a large database of roll prints using a flat print from the same database (a different print from one of those fingers). The sample application was consistently finding a wrong image from a different person.

I want to test your algorithm but I don't know where to start with C ++, can you give me a few instructions for me to run it on Win10?

I am getting this error for some .iso templates.

openafis-cli: /root/openafis/lib/FastMath.h:66: Field::AngleType OpenAFIS::FastMath::ArcTangents::get(const Field::MinutiaCoordType, const Field::MinutiaCoordType) const: Assertion `x > Min && x < Max' failed.
Aborted (core dumped)