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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSION7.7.8.7 Scanned horizontal pixel scale / SHPSThe horizontal pixel density used for the scanning of the original image / impressionproviding that the SLC field contains a “1” or “2”. Otherwise, this shall indicate thehorizontal component of the pixel aspect ratio, up to 5 integer digits. This field is used if thetransmission pixel scale differs from the original image scale, as listed in Transmittedhorizontal pixel scale / THPS . Note that density is directly related to resolution.These are the SHPS fields.Field 10.016: Scanned horizontal pixel scale / SHPSField 13.016: Scanned horizontal pixel scale / SHPSField 14.016: Scanned horizontal pixel scale / SHPSField 15.016: Scanned horizontal pixel scale / SHPSField 16.016: Scanned horizontal pixel scale / SHPSField 19.016: Scanned horizontal pixel scale / SHPSField 20.017: Scanned horizontal pixel scale / SHPS7.7.8.8 Scanned vertical pixel scale / SVPSThe vertical pixel density used for the scanning of the original image / impression providingthat the SLC field contains a “1” or “2”. Otherwise, this shall indicate the verticalcomponent of the pixel aspect ratio, up to 5 integer digits. This field is used if thetransmission pixel scale differs from the original image scale, as listed in Transmittedvertical pixel scale / TVPS . Note that density is directly related to resolution. If SLC is 1or 2 and SHPS is entered, then SVPS shall equal SHPS.These are the SVPS fields.Field 10.017: Scanned vertical pixel scale / SVPSField 13.017: Scanned vertical pixel scale / SVPSField 14.017: Scanned vertical pixel scale / SVPSField 15.017: Scanned vertical pixel scale / SVPSField 16.017: Scanned vertical pixel scale / SVPSField 19.017: Scanned vertical pixel scale / SVPSField 20.018: Scanned vertical pixel scale / SVPS7.7.9 Compression algorithmsImages shall be compressed only from an original uncompressed image. If an image hasbeen received in a compressed format, it shall not be uncompressed and re-compressed inthe same or different format. Regardless of the compression algorithm used, the image shallbe represented as an array of n rows by m columns by at least 8-bit pixels 37 . Each pixel in agray-scale image shall be represented by eight or more bits. Color images shall berepresented as a series of sequential samples of a red, green, and blue intensity for eachpixel. (Other color spaces are also possible. See Section 7.7.10.3).37Greater than 8-bit is not widely supported and has not been scientifically evaluated.86