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

**K.3.1**

**Typical Huffman tables for the DC coefficient differences**

Tables K.3 and K.4 give Huffman tables for the DC coefficient differences which have been developed from the average

statistics of a large set of video images with 8-bit precision. Table K.3 is appropriate for luminance components and Table

K.4 is appropriate for chrominance components. Although there are no default tables, these tables may prove to be useful

for many applications.

**Table K.3 Table for luminance DC coefficient differences**

Category

Code length

Code word

1

0

2

00

0

1

1

3

010

1

2

3

011

1

3

3

100

1

4

3

101

1

5

3

110

1

6

4

1110

1

7

5

11110

1

8

6

111110

1

9

7

1111110

10

8

11111110

11

9

111111110

**Table K.4 Table for chrominance DC coefficient differences**

Category

Code length

Code word

1

0

1

2

00

0

1

1

1

2

01

1

2

1

2

10

1

3

1

3

110

1

4

1

4

1110

1

5

1

5

11110

1

6

1

6

111110

1

7

1

7

1111110

1

8

1

8

11111110

1

9

1

9

111111110

10

10

1111111110

11

11

11111111110

**K.3.2**

**Typical Huffman tables for the AC coefficients**

Tables K.5 and K.6 give Huffman tables for the AC coefficients which have been developed from the average statistics of

a large set of images with 8-bit precision. Table K.5 is appropriate for luminance components and Table K.6 is appropriate

for chrominance components. Although there are no default tables, these tables may prove to be useful for many

applications.

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

**149**