Biometric Specification

Introduction

Biometric images for various modalities are captured, represented, and exchanged according to the specifications outlined below.

Change History

The below table outlines the updates and modifications made to the biometric specifications over time.

Date	Changes
7th May 2021	Removed NFIQ v2.0 from the supported quality score for fingerprint authentication devices.

Image formats

Fingerprint

Captures and compresses fingerprint images for registration and authentication.

Please refer to 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

Note: MOSIP adopters can change this if needed. Please refer to SBI specification documentation.

Iris

Captures high-quality iris images with optional cropping and compression.

Please refer 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

Note: MOSIP adopters can change this if needed. Please refer SBI specification documentation.

Face Capture

Captures facial images with lossless or lossy compression for identification.

Please refer to 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

Note: MOSIP adopters can change this if needed. Please refer SBI specification documentation.

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)

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.