Changing best shot image quality estimation thresholds#
In LUNA ID, you can change thresholds of the image quality estimation according to your needs.
Important: The threshold values are set to optimal by default. We do not recommend that you change the values, unless you are certain of what you are doing.
To change image quality estimation thresholds:
1․ Download the corresponding faceengine.conf file and open it in a text editor:
| OS | Download link |
|---|---|
| Android | faceengine.conf |
| iOS (for devices) | faceengine.conf |
| iOS (for simulators) | faceengine.conf |
2․ Change the required parameter values in the QualityEstimator::Settings section.
Important: When editing the faceengine.conf file, make sure that you change only the required values and do not remove any sections.
| Parameter | Description | Default value |
|---|---|---|
blurThreshold |
Determines whether the image is blurred. | 0.61 |
lightThreshold |
Determines whether the image is overexposed, that is, too light. | 0.57 |
darknessThreshold |
Determines whether the image is underexposed, that is, too dark. | 0.50 |
illuminationThreshold |
Determines whether the face in the image is illuminated unevenly and there is a great difference between dark and light regions. | 0.1 |
specularityThreshold |
Determines whether the image contains flares on face, that is, too specular. | 0.1 |
3․ Place the faceengine.conf file in the corresponding directory:
| OS | Directory |
|---|---|
| Android | assets/data/ |
| iOS (for devices) | fsdk.xcframework/ios-arm64/fsdk.framework/data |
| iOS (for simulators) | fsdk.xcframework/ios-arm64_x86_64-simulator/fsdk.framework/data |
4․ Rebuild and reinstall your app.