# Biometric Specification
## Introduction
Biometrics images for various modalities are represented and exchanged as per the below specifications.
## Change History
| Date | Changes |
| ------------ | ----------------------------------------------------------------------------------------------------- |
| 7th May 2021 | NFIQ v2.0 has been removed from the supported quality score for **fingerprint authentication device** |
## Image formats
### Fingerprint
Refer ISO 19794-4:2011 Specifications.
| Factor | Registration Devices | Authentication Devices |
| -------------------------------------------- | -------------------------------------------------------------------------------- | -------------------------------- |
| Image Specification | ISO 19794-4:2011 Annex B1 | ISO 19794-4:2011 Annex B2 |
| Minimum Resolution | >= 500 native DPI. Higher densities are preferred. | >= 500 native DPI. |
| Minimum Active Platen Area or Capture area\* | >=1.6 x 1.5 inches for 1 to 2 fingers
>=3.2 x 2.0 inches for 4 fingers
| >=0.5 x 0.65 inches\* |
| Greyscale Density | 8 bits (256 grey levels) | 8 bits (256 grey levels) |
| Image Format | JPEG 2000 Lossless | JPEG 2000 Lossy or WSQ |
| Compression Ratio | Lossless | Up to 15:1 |
| Quality Score | NFIQ v2.0 | NFIQ v1.0 |
| Capture Mode | Auto Capture | Auto Capture |
| Preview | > 3 FPS M-JPEG frames with NFIQ 2.0 score superimposed | Not Applicable |
| ESD | >= 8kv | >= 8kv |
| EMC Compliance | FCC class A or equivalent | FCC class A or equivalent |
| Operating Temperature\* | 0 to 50 °C | 0 to 50 °C |
| FTM\*\* | SBI 1.0 - Use host based security (and above) | SBI 2.0 - FTM supported security |
{% hint style="info" %}
\* MOSIP adopters can change this if needed.\
\*\* Please refer [SBI specification documentation](https://docs.mosip.io/1.1.5/biometrics/broken-reference).
{% endhint %}
### Iris
RRefer to ISO 19794-6:2011 Specifications.
| Factor | Registration Devices | Authentication Devices |
| ----------------------- | ----------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------- |
| Image Specification | ISO 19794-6:2011 Annex B | ISO 19794-6:2011 Annex B |
| Minimum Iris Diameter | >=210 pixels | >=150 pixels |
| Grey Scale Density | 8 bits (256 grey levels) | 8 bits (256 grey levels) |
| Spatial Resolution | >=60% @ 2Lp/mm | >= 50% @ 1Lp/mm |
| Pixel Resolution | >10 pixels/mm | >10 pixels/mm |
| Capture Distance | >=10CM | >=10CM |
| Imaging Wavelength | Approximately 700-900 nm | Approximately 700-900 nm |
| Illumination | The eye should be illuminated using infrared or any other source that could produce high-quality gray scale image | The eye should be illuminated using infrared or any other source that could produce high-quality gray scale image |
| Image Format | IMAGE\_TYPE\_VGA (K2) OR IMAGE\_TYPE\_CROPPED (K3) | IMAGE\_TYPE\_CROPPED\_AND\_MASKED (K7) |
| Compression | JPEG 2000 Lossless | JPEG 2000 Lossy |
| Compression Ratio | Lossless | Up to 15:1 (>= 3.5 KB) |
| Aspect Ratio | 1:1 | 1:1 |
| Capture Mode | Auto Capture | Auto Capture |
| Scan Type | Progressive | Progressive |
| Preview | >= 3 FPS M-JPEG frames with quality score superimposed | Not Applicable |
| EMC compliance | FCC Class A or equivalent | FCC Class A or equivalent |
| Operating Temperature\* | 0 to 50 °C | 0 to °50 C |
| FTM\*\* | SBI 1.0 - Use host-based security (and above) | SBI 2.0 - FTM supported security |
{% hint style="info" %}
\* MOSIP adopters can change this if needed.\
\*\* Please refer [SBI specification documentation](https://docs.mosip.io/1.1.5/biometrics/broken-reference).
{% endhint %}
### Face Capture
Refer ISO 19794-5:2011 Specifications.
| Factor | Registration Devices | Authentication Devices |
| ----------------------------- | --------------------------------------------------------------------------------------------------------------------- | -------------------------------- |
| Image Specification | ISO/IEC 19794-5:2011 | ISO/IEC 19794-5:2011 |
| Camera Specification | 1080p with 90 degree FoV or above | 720p or above |
| Skin Tone | All | All |
| Exception Image Specification | Full Frontal with FACE features, two palms next to the face, waist up photo.
60mm(width) X 40mm(height)
| Not Applicable |
| Image quality | ICAO - Full frontal image, +/- 5 degrees rotation, 24 bit RGB, white background
35 mm(width) X 45mm(height)
| ICAO is not mandated |
| Image format | JPEG 2000 Lossless | JPEG 2000 Lossy |
| Compression Ratio | Lossless | Up to 15:1 |
| EMC compliance | FCC Class A or equivalent | FCC Class A or equivalent |
| Operation Temperature\* | 0 to 50 °C | 0 to 50 °C |
| FTM\*\* | SBI 1.0 - Use host based security (and above) | SBI 2.0 - FTM supported security |
{% hint style="info" %}
\* MOSIP adopters can change this if needed.\
\*\* Please refer [SBI specification documentation](https://docs.mosip.io/1.1.5/biometrics/broken-reference).
{% endhint %}
{% hint style="info" %}
*Capture Time across modalities should be less than 4 Seconds (time taken for providing a final capture response to the calling application, when the biometrics are well placed on the sensors)*
{% endhint %}
We recommend that countries look at ergonomics, accessibility, ease of usage, and common availability of devices while choosing devices for use in registration and authentication scenarios.
## XML Container
The biometric data is wrapped in [CBEFF XML](https://docs.mosip.io/1.1.5/biometrics/cbeff-xml).