ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ...
ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ... ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ...
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationWSQ Version 2.0 1 WSQ20JPEG ISO/IEC 10918 (Lossy) 2 JPEGBJPEG ISO/IEC 10918 (Lossless) 3 JPEGLJPEG 2000 ISO/IEC 15444-1(Lossy)JPEG 2000 ISO/IEC 15444-1(Lossless)4 JP25 JP2LPortable Network Graphics 6 PNGThe "JPEGB" algorithm indicates that the scanned or captured image wascompressed using baseline JPEG. An entry of "JPEGL" indicates that thelossless mode of the JPEG algorithm was used to compress the image. If theimage is captured in grayscale, then only the luminance component shall becompressed and transmitted. For JPEG, the data shall be formatted inaccordance with the JPEG File Interchange Format, Version 1.02 (JFIF) 7 .An entry of "JP2" indicates that the scanned or captured image was compressedusing lossy JPEG 2000. (Conformance with ISO 15444-1 is provided throughpart 4 of the standard, ISO 15444-4 “Conformance Testing”.) An entry of "JP2L"indicates that the lossless mode of the JPEG 2000 algorithm was used tocompress the image. For JPEG 2000, the data shall be formatted inconformance with JP2 format as described in ISO 15444-1.Where JPEG 2000 is used for the compression of fingerprint images,specification/options contained in Profile for 1000ppi Fingerprint Compressionshall apply. This reference addresses the 9 quality layers between 0.015 bppand 0.55 bpp.Where JPEG 2000 is used for compression of facial images, the followingconditions shall apply:Filters: The 9-7 irreversible filters described in ISO 15444-1 should be used forlossy mode; however for handheld devices (fixed point processors), the 5-3reversible filters may be used instead. The 5-3 reversible filters shall be used forlossless mode. A conformant decoder shall be able to decode code streamscreated through both filters.Number of resolution levels: The image shall be encoded using enoughresolution levels to ensure that a thumbnail with max (width, height)
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationavailable in the image. Example: a 640x480 image shall be encoded with 5resolution levels, which enables sub-resolution decodes of 320x240, 160x120,80x60, and 40x30.Resolution as the dominant progression: JPEG 2000 allows five progressionorders - LRCP, RLCP, RPCL, PCRL and CPRL. The RLCP progression order(resolution, layer, component, position) shall be used since it best facilitatesdecode and display of lower resolution derivative images by remote networkeddevices. Through the RLCP progression order, the code stream shall beformatted so that the resolution information of the image is the first data madeavailable to a decoder in a streaming mode of operation.Bits per channel: The number of bits per channel for encoders and decodersshall be 8-16 bits.Single tile images: Facial images shall be encoded using only single tile to avoidtiling artifacts.JPEG 2000 quality layers: The image shall be encoded using at least 10 qualitylayers to enable quality progressive decoding or sub-quality image extraction.Region of Interest (ROI) Encoding is allowed: This encoding method is a usefulway to compress a facial image to a small size, while retaining sufficient imagequality within the specified ROI to perform either human or automatedidentification.4.7 Scan sequenceEach image formatted in accordance with this standard shall appear to havebeen captured in an upright position and approximately centered horizontally inthe field of view. The recorded image data shall appear to be the result of ascanning of a conventional inked impression of a friction ridge print or photo of aface or iris. This is also equivalent to a live-scan capture of the friction ridgeprint, or a camera capture of a face or iris. The scanning sequence (andrecorded data) shall appear to have been from left-to-right, progressing from topto-bottomof the fingerprint, plantar, palmprint, face, SMT, or iris. Figure 2illustrates the recording order for the scanned fingerprint image.For the purpose of describing the position of each pixel within an image to beexchanged, a pair of reference axes shall be used. The origin of the axes, pixellocation (0,0), shall be located at the upper left-hand corner of each image. Thex-coordinate (horizontal) position shall increase positively from the origin to theright side of the image. The y-coordinate (vertical) position shall increasepositively from the origin to the bottom of the image.Brad Wing 6/19/10 5:07 PMComment: Wording change9DRAFT 2
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<strong>ANSI</strong>/<strong>NIST</strong>-<strong>ITL</strong> 1-<strong>2011</strong>Data Format for the Interchange of Biometric and Forensic Informationavailable in the image. Example: a 640x480 image shall be encoded with 5resolution levels, which enables sub-resolution decodes of 320x240, 160x120,80x60, and 40x30.Resolution as the dominant progression: JPEG 2000 allows five progressionorders - LRCP, RLCP, RPCL, PCRL and CPRL. The RLCP progression order(resolution, layer, component, position) shall be used since it best facilitatesdecode and display of lower resolution derivative images by remote networkeddevices. Through the RLCP progression order, the code stream shall beformatted so that the resolution information of the image is the first data madeavailable to a decoder in a streaming mode of operation.Bits per channel: The number of bits per channel for encoders and decodersshall be 8-16 bits.Single tile images: Facial images shall be encoded using only single tile to avoidtiling artifacts.JPEG 2000 quality layers: The image shall be encoded using at least 10 qualitylayers to enable quality progressive decoding or sub-quality image extraction.Region of Interest (ROI) Encoding is allowed: This encoding method is a usefulway to compress a facial image to a small size, while retaining sufficient imagequality within the specified ROI to perform either human or automatedidentification.4.7 Scan sequenceEach image formatted in accordance with this standard shall appear to havebeen captured in an upright position and approximately centered horizontally inthe field of view. The recorded image data shall appear to be the result of ascanning of a conventional inked impression of a friction ridge print or photo of aface or iris. This is also equivalent to a live-scan capture of the friction ridgeprint, or a camera capture of a face or iris. The scanning sequence (andrecorded data) shall appear to have been from left-to-right, progressing from topto-bottomof the fingerprint, plantar, palmprint, face, SMT, or iris. Figure 2illustrates the recording order for the scanned fingerprint image.For the purpose of describing the position of each pixel within an image to beexchanged, a pair of reference axes shall be used. The origin of the axes, pixellocation (0,0), shall be located at the upper left-hand corner of each image. Thex-coordinate (horizontal) position shall increase positively from the origin to theright side of the image. The y-coordinate (vertical) position shall increasepositively from the origin to the bottom of the image.Brad Wing 6/19/10 5:07 PMComment: Wording change9DRAFT 2
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