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

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ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationTable 9 is extended with minimum dimensions for common 2-finger and 3-finger combinations 16 . Note that mobile devices can use the codes defined inthe above table, as well as those presented below.Finger positionFingercodeMin Width(mm) (in)Min Length(mm) (in)2-Finger CombinationsRight index/middle 40 40.6 1.6 38.1 1.5Right middle/ring 41 40.6 1.6 38.1 1.5Right ring/little 42 40.6 1.6 38.1 1.5Left index/middle 43 40.6 1.6 38.1 1.5Left middle/ring 44 40.6 1.6 38.1 1.5Left ring/little 45 40.6 1.6 38.1 1.5Right index/ Left index 46 40.6 1.6 38.1 1.53-Finger CombinationsRight index/middle/ring 47 63.5 2.5 38.1 1.5Right middle/ring/little 48 63.5 2.5 38.1 1.5Left index/middle/ring 49 63.5 2.5 38.1 1.5Left middle/ring/little 50 63.5 2.5 38.1 1.510.5 Field 4.005: Image scanning resolution / ISRThis field is mandatory. It shall contain a value of “0” if the minimum scanningresolution of 500 ppi is used and a “1” if the native scanning resolution is used.The preferred transmitting resolution (500 ppi to 520 ppi) shall be the same asthe minimum scanning resolution.10.6 Field 4.006: Horizontal line length / HLLThis mandatory field shall be used to specify the number of pixels contained on asingle horizontal line of the transmitted image.Brad Wing 6/19/10 5:07 PMComment: Footnote revised for clarityBrad Wing 6/19/10 5:07 PMComment: Revised for clarity on resolutions.16No maximum dimensions are included, but there are practical maximum upper limits to the image size. The minimumareas for codes 42, 45, 48 and 50 may not be sufficient for practical use. The actual size will depend upon the equipmentused.It should be noted that codes 13-15 and 40-50 are for simultaneous 2 and 3 and 4 – finger combinations. The titlesof the finger combinations are given from the thumb outwards (that is, left to right for the right hand and right to left for theleft hand). Code 46 “Right index / Left index” means that the right index placed on the right portion of the imaging areaand the left index on the left portion of that same imaging area.34DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information10.7 Field 4.007: Vertical line length / VLLThis mandatory field shall be used to specify the number of horizontal linescontained in the transmitted image.10.8 Field 4.008: Compression algorithm / CGA / BCAThis mandatory field shall be used to specify the type of compression algorithmused (if any). A zero denotes no compression. Otherwise, the contents shall bea number allocated to the particular compression technique used by theinterchange parties. The specific code for each algorithm can be found in Table2 or from the domain registrar who will maintain a registry relating these numbersto the compression algorithms. The Wavelet Scalar Quantization (WSQ), or theJPEG 10918 standard algorithms are recommended for compressing thegrayscale data at 500 ppi.10.9 Field 4.009: Image data / DATAEach pixel of the uncompressed grayscale image shall be quantized to eight bits(256 gray levels) contained in a single byte. For the exchange of anuncompressed binary image, eight pixels shall be left justified and packed into asingle unsigned byte. The most significant bit of the byte shall be the first of theeight pixels scanned. If compression is used, the pixel data shall be compressedin accordance with the compression technique specified in the GCA / BCA field.11 Type-7 user-defined image recordType-7 records shall contain user-defined binary image information relating to thetransaction submitted for processing. This record type was originally defined tohandle miscellaneous images such as those pertaining to mugshots, latent prints,palmprints, wrists, toes, soles, etc. that were not addressed elsewhere in theearly versions of this standard. Users are discouraged from utilizing this RecordType. For latent prints users should utilize Record Type-13. Newimplementations based on this standard shall use the Record Type-13 recordsfor latent records, and other record types, as appropriate, for transmittingbiometric and forensic images.Images transmitted using Record Type-7 shall consist of scanned pixels that maybe either binary or grayscale output. Each grayscale pixel value shall beexpressed as an unsigned byte. A value of “0” shall be used to define a blackpixel and an unsigned value of “255” shall be used to define a white pixel. Forbinary pixels, a value of “0” shall represent a white pixel and a value of “1” shallrepresent a black pixel. If compression is used, the algorithm shall be the sameas that specified for Type-4 logical records.Record Type-7 does not contain fields for image hash, original image referencevalue, or geographic collection reference since the Traditional encoding for thisrecord type is fixed in length and order.Brad Wing 6/19/10 5:07 PMComment: Clarification of encouragement touse record type 13.35DRAFT 2
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