MIL-HDBK-1300 National Imagery Transmission Format Standard NitfsThis document describes the NITFS and its image and communications processing components. It provides general information regarding NITFS.

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MIL-HDBK-1300A

application.  At audio/telephone frequencies, a bandwidth exceeding 4 kHz can be considered wideband.  At HF radio frequencies, 3-30 MHz, a bandwidth larger than 3 kHz would be considered wideband.  In communications security systems, any bandwidth exceeding that of a nominal four kHz telephone channel is considered wideband.  3. That property of any communication facility, equipment, channel, or system in which the transmitted bandwidth is greater than 0.1 percent of the midband frequency.  4. In commercial telephone usage, that property of a circuit having a bandwidth greater than 4 kHz.

iw.  YCbCr601 - Luminance, chrominance color representation.  Y = Luminance. Cb = Blue color difference.  Cr = Red color difference.

ix.  YIQ - A combination of brightness and phasing data that defines a color signal. Y = Brightness of signal.  I = Inphase color signal (defines the colors orange to cyan).

Q = Quadrature of the color signal (defines the colors purple to yellow green).

iy.  Zig-zag sequence - A specific sequential ordering of the DCT coefficients from

(approximately) lowest spatial frequency to highest.

iz.  Zulu - Synonym - Coordinated Universal Time.  Formerly a synonym for Greenwich

Mean Time.

ja.  (8x8) block - An 8x8 array of samples.

jb.  3-sample predictor - A linear combination of the three nearest neighbor reconstructed samples to the left and above (in lossless mode coding).

3.4  Symbols.  The symbols used in NITFS documentation are defined as follows:

a.   AC                        AC DCT coefficient

b.   BITS                     16 byte list containing number of Huffman codes of each length

c.   Cu

d.   Cv

horizontal frequency dependent scaling factor in DCT

vertical frequency dependent scaling factor in DCT

e.   CAT                     size category of DC difference of AC coefficient amplitude

f.    CODE                  Huffman code value

g.   CODESIZE (V)   code size for symbol V

h.   DC                        DC DCT coefficient

th

i.    DCi

DC coefficient for i   block in component

j.    DHT                     define-Huffman-table marker

k.   DIFF                     difference between quantized DC and prediction l.    DQT                     define-quantization-table marker

m.  DRI                      define restart interval marker

n.   EHUFCO             Huffman code table for encoder

o.   EHUFSI               encoder table of Huffman code sizes

p.   EOB                     end-of-block for sequential; end-of-band for progressive q.   EOI                       end-of-image marker

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