Biometric Image Specification

Introduction

Biometrics images for various modalities are represented and exchanged as per the below specifications.

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 or NFIQ v2.0
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
* MOSIP adopters may change this if needed.

Iris

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
Greyscale 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
* MOSIP adopters may change this if needed.

Face

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
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)
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