MIL-HDBK-1300A
hj. Reduced Resolution Data Set (RRDS) - A series of images, each at half the resolution of the previous one. R0 (Resolution 0) is the largest file, and R7 is the smallest. An RRDS will be a set of separate NITF files. The image magnification field will contain a magnification that correlates with the level of the RRDS. A naming convention will be used for NITF files that collectively, make up an RRDS, such as image_id.ro through image_id.r7.
hk. Reed-Solomon code - For the purpose of NITF, a class of FEC codes in which the input and output symbols are multi-bit symbols and are treated as Finite Field elements.
data.
hl. Required - In the NITF context, a data field that must be present and filled with valid
hm. Resolution - 1. The minimum difference between two discrete values that can be distinguished by a measuring device. Note: High resolution does not necessarily imply high accuracy. 2. The degree of precision to which a quantity can be measured or determined. 3. A measurement of the smallest detail that can be distinguished by a sensor system under specific conditions.
hn. Restart interval - The integer number of Minimum Coded Units (MCUs) processed as an independent sequence within a scan.
ho. Restart marker - The marker that separates two restart intervals in a scan.
hp. RS-170 - The Electronic Industries Association (EIA) standard that specifies the format for television signals as implemented by the National Television Systems Committee standard used for monochrome television.
hq. RS-170A - The EIA standard that specifies the format for television signals as implemented by the NTSC standard used for color television.
hr. RS-232C - An EIA standard that specifies the electrical characteristics and
plug/socket interface (25 pin) for relatively slow (normally less than 20,000 bits-per-second) bit serial circuits.
hs. RS-422 - An EIA standard that specifies the electrical characteristics of bit serial circuits with balanced voltage interface circuitry and operates at a maximum of 10,000,000 bits-per- second at 12 meters.
ht. RS-423 - An EIA standard that specifies the electrical characteristics of bit serial circuits with unbalanced voltage interface circuitry. RS-423 circuits operate at a maximum of
300,000 bits-per-second at ten meters and are electrically interoperable with RS-232 circuits.
hu. RS-449 - An EIA standard that specifies a 37-pin socket and a 9-pin socket intended for use with RS-422/423.
hv. Run (length) - Number of consecutive symbols of the same value.
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