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This package was compiled by the FAA Alaskan Region Public Affairs Office in Anchorage and sent to FAA managers with a memo from Paul Steucke dated March 5, 1987. It gathers material on the November 17, 1986 sighting by the crew of Japan Air Lines flight 1628: a news release, pilot and controller transcripts, crew interviews and radar analysis. The FAA concluded that it could not confirm the event. It attributed the second radar target to a split, uncorrelated return from the JAL Boeing 747 and planned no further investigation.
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Federal Agencies Digitization Initiative Still Image Working Group - August 2010 Future work of the Still Image Working Group will rely on the information in these tables to establish quantitative guidelines using the described derivative metrics and evaluation criteria. The actual values that will be inse1ted into specific imaging guidelines will depend on the content to be digitized and the objectives for digitization. Graphical symbols used in the row labeled "Evaluative Criteria (units)" indicate Prima1y , Secondary and Tertia1y measures (see tables below). These have meaning both across and within metrics. Across the metrics or image characteristics, they indicate the relative importance as a factor of image quality; from the highest (Primary) to the lowest (Tertiary). The same concept applies within the measurement for a given metric. Taking SFR as an example, Max SFR gain is suggested as the Primary Measure under Sharpening, and Sign of SFR slope as a Secondary Measure. There are also two additional infonnational tiers included in the table. One of these provides a listing of related descriptive tem1s that may be more commonly known to users. The bottom-most tier provides a list of possible causes of failure related to a particular metric. A a short primer and oven1iew on imaging science is available as a Powerpoint at http://digitizationguidelines.gov/stillimages/presentations.htrnl Part 1 - Taxonomy of Digital Imaging Performance See subsequent pages for information on definitions, candidate evaluation criteria, related descriptive tenns, and failure causes ~i Signal 5l Noise ~~ ·a ~o ~ 1il OECF SFR jij ci::: Radiometric: Distortionc: t~ (Opto-Electronic Cl NPS Geometric: Distortion ·~J ( Spatial Frequency inConversion ~ Function) Response) (Noise Power Spectrum) Total Noise iOlrotni1 ~~ a- TemDOnJ/ Fixed o;. ttem , ,~,~ it ·~ R ~ I i ~ i ~ i i ~ 1 i ~ I~ <ti -.:::. ~ I ~ '11111: ~ ~ ~ el ~ I i ·1 j ~ ~ j ..~ ~ .s ~ i i:l- ~ ~ ~ ~ ~ ~ l t ~ ~ ~ ~ ~ ~ at di J ~ ·!:.:! ~ ~ ~ ~ ~ ~ ~·S 'i ~ !:II ! ;e. - ~' ~ t e:: ~ e e ~ ~ :§ ~ ! I ~ ~ ~ "" I .~ .i:;; 1 ~ ~ ~ 1 ~ ~ .!;;! ~ .!;! ~ (!! ~ ~ ~ ~ ~~ ~ ::5 ~ I ~ ~ 1::5 ~ :§ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ c2! ~ a • While imaging noise Is generally considered to be of a random or stochastic granular nature (e.g., photographic film grain), it can actually take many forms. We have c:hosen to categorize It In both by its deterministic and stochastic behaviors. Technical Guidelines for Digitizing Cultural Heritage Materials: Creation of Raster Image Master Files 8 ---- I )
Document, cited by the archive. The PDF is mirrored here; the original link is under it. 122 pages are in the text index: search them above, or from the library's search.