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參數(shù)資料
| 型號(hào)： | ADV612 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 視頻Codec |
| 英文描述： | Closed Circuit TV Digital Video Codec(閉路電視數(shù)字視頻編碼譯碼器) |
| 中文描述： | 閉路電視數(shù)字視頻編解碼器（閉路電視數(shù)字視頻編碼譯碼器） |
| 文件頁數(shù)： | 8/48頁 |
| 文件大小： | 1085K |
| 代理商： | ADV612 |
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ADV611/ADV612
–8–
REV. PrA
Cb COMPONENT
TECHNCAL
DATA
41
38
35
32
26
23
29
20
17
14
8
5
11
2
Cr COMPONENT
LOW
HIGH
QUANTIZATION OF MALLAT BLOCKS
39
36
33
30
24
21
27
18
15
12
3
9
0
Y COMPONENT
40
37
34
31
25
22
28
19
16
13
7
4
10
1
Figure 10. Typical Quantization of Mallat Data Blocks (Graphed)
THE PROGRAMMABLE QUANTIZER
This block quantizes the filtered image based on the response
profile of the human visual system. In general, the human eye
cannot resolve high frequencies in images to the same level of
accuracy as lower frequencies. Through intelligent “quantiza-
tion” of information contained within the filtered image, the
ADV611/ADV612 achieves compression without compromising
the visual quality of the image. Figure 9 shows the encode and
decode data formats used by the quantizer.
Figure 10 shows how a typical quantization pattern applies over
Mallat block data. The high frequency blocks receive much
larger quantization (appear darker) than the low frequency
blocks (appear lighter). Looking at this figure, one sees some key
point concerning quantization: (1) quantization relates directly
to frequency in Mallat block data and (2) levels of quantization
range widely from high to low frequency block. (Note that the
fill is based on a log formula.) The relation between actual
ADV611/ADV612 bin width factors and the Mallat block fill
pattern in Figure 10 appears in Table III.
9.7
WAVELET
DATA
6.10
1/BW
15.17 DATA
0.5
15.0 BIN
NUMBER
QUANTIZER - ENCODE MODE
TRNC
SIGNED
UNSIGNED
SIGNED
1/BW
QUANTIZER - DECODE MODE
8.8 BW
23.8
DE-QUANTIZED
WAVELET DATA
9.7
WAVELET
DATA
15.0 BIN
NUMBER
SIGNED
UNSIGNED
SIGNED
BW
SAT
Figure 9. Programmable Quantizer Data Flow
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