The Tevian face recognition module operates using one of the following algorithms:

  1. Fast and less resource-intensive algorithm.
  2. Slow and more resource-intensive algorithm providing the higher quality of recognition for large samples.

The fast algorythm is used by default. Use the Tevian.IdentificationAlgorithm registry key to switch over used algorithms (see the Registry Keys Reference Guide, the current version of the document is available in the AxxonSoft documentation repository).

Vectors received by one algorithm can not be used with vectors received by another algorithm without additional processing. Conversion is required to use the vectors received by one algorithm with vectors received by another algorithm without repeated adding of faces to the database.    

Conversion of vectors also enables using the  vectors received by another recognition module, e.g. Cognitec, if it is replaced by the Tevian recognition module.

Conversion of vectors is available if initial vectors were received in the Face Intellect software not older than 5.2 version.

Vectors are converted as follows:

  1. Left click the  icon (Face Recognition Server) in the Windows taskbar (system tray) (for details about the Face Recognition Server debug window see Appendix 2. Debug window).
  2. In the opened window select Tools -> Recreate firs.

  3. Wait for completion of biometric vectors converting.

New vectors should be generated on the update from Face Intellect v. 7.0 to Face Intellect v. 7.1 in case the VisionLabs module is used.


Errors may occur during the vectors conversion process.

For example, the error below may occur due to the fact that the new face recognition module SDK or the algorithm of the Tevian ALG2 face recognition module cannot recognize a face on a poor quality image and generate a vector due to its better and more demanding recognition capabilities. Therefore, such image can be skipped.

[FIRSERVER][1] ERROR: Problem with regenerating fir for id 79656915-5BC1-E811-AA3F-1C1B0D34F0DF, skipping ...

If Intellect malfunctions after the vectors conversion, do the following:

  1. Shutdown Intellect.
  2. Run FaceRecognitionTool.exe tool stored at: <Intellcet installation folder>\Modules.

  3. Specify required settings - in the Path field specify the path to the folder where the data will be uploaded to (e.g. C:\Backup).

  4. Upload the data.

    Find more information on FaceRecognitionTool.exe in Face Recognition tool utility for extracting captured and reference faces from the database section.


  5. Execute the following script in the database manager (e.g. SQL Server Management Studio):

    USE [Fir]
GO
DECLARE	@return_value int
EXEC	@return_value = [dbo].[spReset]
SELECT	'Return Value' = @return_value
GO


  6. Start Intellect and upload images from the folder specified in the Path field to the reference face database (see Selecting a way to upload an image to the reference face database).