acknowledgements for ansi/nist-itl 1-2011 - NIST Visual Image ...

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONcompression ratios. For JPEG 2000, these capabilities are built into the implementation.For both JPEG and JPEG 2000, care must be taken to account for automatic compression bycamera hardware. Multiple compression stages can damage the quality of photographic data.When possible, minimum compression (highest resolutions) should be applied at the cameralevel when external software performs the final (15:1 or less) compression stage.Table 116: Example file sizes after compressionLevelMinimumWxHUncompressedSize (RGB888)Size @ 2:1LosslessCompressionSize @ 15:1compressionfor the entireimageSize @ 15:1compression forthe face and120:1 for thebackground30/32 480x600 844 KB 58 KB 19.34 KB40/42 768x1024 2.3 MB 156 KB 52.8 KB50 3300x4400 42.5MB 14.2 MB51/52 2400x3200 22.5 MB 7.5 MBTable 116 provides the typical size of a single facial photograph using the compressionrecommendations contained in this section.This table is based upon the image being formattedas RGB888 (8 bits per color channel per pixel) for levels 30, 32, 40 and 42. Since the facewidth is 50% of the image width, then the area taken by the face is estimated to be 25% of thetotal image area. SAP levels 50, 51, and 52 include the constraint of lossless compression forthe frontal pose facial image as discussed above.E.7 Format requirements (SAP levels 40, 42, 50, 51 and 52)E.7.1 The definition and range of pose anglesThe Yaw and Roll angles shall be measured from the full face pose position and have a range ofvalues from -180 degrees to +180 degrees. The Pitch angle shall have a range of values from-90 degrees to +90 degrees. The pose angle set is given by Tait-Bryan angles as shown inFigure 25. 198198From http://en.wikipedia.org/wiki/Euler_anglesMay, 2013 DRAFT VERSION UPDATE 2013 Page 479