ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ...

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136ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationimages are of relatively poor quality compared to mugshots, including significantpose angle used for the frontal view, poor image resolution, poor image contrast,etc.14.13.3 Levels 10-15 (Other application profiles)Levels 10-15 shall denote transaction associated with capture under theguidance of other facial standards or application profiles as defined below.Level-10 denotes a driver license facial portrait described in the AAMVAInternational Specification – DL/ID Card DesignLevel-11 denotes an ANSI facial image that meets requirements of the FullFrontal Image type defined in ANSI INCITS 385-2004Level-12 denotes an ANSI facial image that meets requirements of the TokenFace Image type defined in ANSI INCITS 385-2004Level-13 denotes an ISO facial image that meets the requirements of the FullFrontal Image defined in International standard ISO/IEC 19794-5Level-14 denotes an ISO facial image that meets the requirements of the TokenFace Image type defined in International standard ISO/IEC 19794-5Level-15 denotes a PIV facial image that meets requirements of Biometric DataSpecification for Personal Identity Verification defined in NIST SP 800-76.Note that the facial images of Level-13 and Level-14 may come from traveldocuments as described in “Deployment of Machine Readable TravelDocuments’’, ICAO Technical Report, version 2.0.14.13.4 Level-20 (Legacy facial mugshot)A facial image conforming to this application profile level shall be a mugshotformatted according to ANSI/NIST-ITL 2000, but not necessarily or known to beconforming to the best practice requirements given in level-30. The subjectpose(s) can be Frontal, Profile, or Angled.14.13.5 Best Practice Application Level-30A facial image conforming to a level-30 application profile shall include at leastone mugshot record conforming to all best practice requirements (BPR). Thesemugshots shall adhere to strict background, lighting, and resolutionrequirements. In particular, the background is 18% gray, the lighting is threepoint,and the image size is at least 480x600 pixels with an aspect ratio of 1:1.25.14.13.6 Best Practice Application Level-40A facial image conforming to the level-40 application profile can be captured withan off-the-shelf 1megapixel camera. Requirements for conformance with level-40facial image capture include the following:DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information• Conformance to the minimum requirements for the capture of level-30 facialimages• At least one frontal face image shall be captured which conforms to the “faceimage capture requirements”• The minimum number of pixels in the electronic digital image shall be 768pixels in the horizontal direction by 1024 pixels in the vertical direction and• Facial images shall conform to the “head and shoulders” composition detailedrequirements.It should be noted that the image quality of the captured facial images will beimproved as the number of pixels in both directions are increased. However, asimages are captured with an increased number of pixels, the 3:4 (Width:Height)aspect ratio shall be maintained.14.13.7 Best Practice Application Level-50 and Level-51A facial image conforming to the level 50 and level 51 application profiles shallinclude “face image capture requirements”. These profile levels are intended toallow for examination of up to forensic-level (10 ppmm) detail on a subject’s face.The only difference between level-50 and level-51 is that level-50 specifies the“head and shoulders” composition requirements while level-51 specifies the“head only” composition requirements.Identification applications require approximately 1700 pixels wide by 2515 pixelshigh on the face for the 99th percentile male in the U.S. population. Allocating50% of the image width for the head requires approximately 3400 pixels for a“head and shoulders photo” image width. For a level-50 image capture profile,the minimum number of pixels in the electronic digital image shall be 3300 pixelsin the horizontal direction by 4400 pixels in the vertical direction. Off-the-shelf 15(or more) megapixel digital cameras satisfy this requirement.As an alternative, allocating 70% of the image width for the head requiresapproximately 2400 pixels for the “head only” facial capture. For a level-51image capture profile, the minimum number of pixels in the electronic digitalimage shall be 2400 pixels in the horizontal direction by 3200 pixels in thevertical direction. Off-the-shelf 8 megapixel digital cameras satisfy thisrequirement.The level-50 and level-51 SAPs allow for the encoding of face images that areconsistent with the discussion above and with the “face image capturerequirements”. It should be noted that the image quality of the captured facialimages might be improved as the number of pixels in both directions areincreased. Figure 27 illustrates the improvement in image quality from levels 30to 50/51. However, as images are captured with an increased number of pixels,the 3:4 (Width:Height) aspect ratio shall be maintained.137DRAFT 2
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