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STV0974 Datasheet(PDF) 19 Page - STMicroelectronics

Part # STV0974
Description  Mobile Imaging DSP
PDF  69 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV0974 Datasheet(HTML) 19 Page - STMicroelectronics

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Functional description
STV0974
19/61
The Huffman table used are described in ISO DIS 10918-1 Annex A - Section K.3.
In the above example, the first AC coefficient of Block Y1 is 0, as good as the second one. The
zeros are not Huffman encoded, but the runlength counts them. When the first non-zero value is
reached (Coefficient 4 with value 77), the Huffman code for the pair (number of preceding zeros,
value) = (2,77) if Huffman encoded.
The code that is generated is Code = Huffman (2,77).
Figure 11: Encoding of AC coefficient
1
Block Y1 data values
12
234
DCT coefficient numbers in zigzag order
64
63
DC
AC
DC
234
63
1
AC
Block Y2 data values
0
0
77
10
45
22
10
0
0
64



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