**ISO/IEC 10918-1 : 1993(E)**

Nb

number of data units in MCU

Next_Index_LPS

new value of Index(S) after a LPS renormalization

Next_Index_MPS

new value of Index(S) after a MPS renormalization

Nf

number of components in frame

NL

number of lines defined in DNL segment

Ns

number of components in scan

OTHERS(V)

index to next symbol in chain

P

sample precision

Pq

quantizer precision parameter in DQT segment

Pq(t)

quantizer precision parameter in DQT segment for quantization table t

PRED

quantized DC coefficient from the most recently coded block of the component

Pt

point transform parameter

Px

calculated value of sample

Q

ji

quantizer value for coefficient AC

ji

Q

vu

quantization value for DCT coefficient S

vu

Q

00

quantizer value for DC coefficient

QAC

ji

quantized AC coefficient predicted from DC values

QDC

k

*k*th quantized DC value used in prediction of AC coefficients

Qe

LPS probability estimate

Qe(S)

LPS probability estimate for context index S

Qk

*k*th element of 64 quantization elements in DQT segment

r

vu

reconstructed image sample

R

length of run of zero amplitude AC coefficients

R

vu

dequantized DCT coefficient

Ra

reconstructed sample value

Rb

reconstructed sample value

Rc

reconstructed sample value

Rd

rounding in prediction calculation

RES

reserved markers

Ri

restart interval in DRI segment

RRRR

4-bit value of run length of zero AC coefficients

RS

composite value used in Huffman coding of AC coefficients

RST

m

restart marker number m

s

yx

reconstructed value from IDCT

S

context index

S

vu

DCT coefficient at horizontal frequency u, vertical frequency v

**10**

**CCITT Rec. T.81 (1992 E)**