ISO/IEC 10918-1 : 1993(E)
Da
in DC coding, the DC difference coded for the previous block from the same component;
in lossless coding, the difference coded for the sample immediately to the left
DAC
define-arithmetic-coding-conditioning marker
Db
the difference coded for the sample immediately above
DC
DC DCT coefficient
DC
i
DC coefficient for ith block in component
DC
k
kth DC value used in prediction of AC coefficients
DHP
define hierarchical progression marker
DHT
define-Huffman-tables marker
DIFF
difference between quantized DC and prediction
DNL
define-number-of-lines marker
DQT
define-quantization-tables marker
DRI
define restart interval marker
E
exponent in magnitude category upper bound
EC
event counter
ECS
entropy-coded segment
ECS
i
ith entropy-coded segment
Eh
horizontal expansion parameter in EXP segment
EHUFCO
Huffman code table for encoder
EHUFSI
encoder table of Huffman code sizes
EOB
end-of-block for sequential; end-of-band for progressive
EOBn
run length category for EOB runs
EOBx
position of EOB in previous successive approximation scan
EOB0, EOB1, ..., EOB14
run length categories for EOB runs
EOI
end-of-image marker
Ev
vertical expansion parameter in EXP segment
EXP
expand reference components marker
FREQ(V)
frequency of occurrence of symbol V
H
i
horizontal sampling factor for ith component
H
max
largest horizontal sampling factor
HUFFCODE
list of Huffman codes corresponding to lengths in HUFFSIZE
HUFFSIZE
list of code lengths
HUFFVAL
list of values assigned to each Huffman code
i
subscript index
I
integer variable
Index(S)
index to probability estimation state machine table for context index S
j
subscript index
J
integer variable
8
CCITT Rec. T.81 (1992 E)