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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