參數(shù)資料
型號(hào)： ADV601JS
廠商： ANALOG DEVICES INC
元件分類(lèi)： 消費(fèi)家電
英文描述： Low Cost Multiformat Video Codec
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝： PLASTIC, QFP-160
文件頁(yè)數(shù)： 7/52頁(yè)
文件大小： 606K
代理商： ADV601JS
ADV601
–7–
REV. 0
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
ADV601 achieves compression without compromising the visual
quality of the image. Figure 7 shows the encode and decode
data formats used by the quantizer.
Figure 8 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 ADV601 bin width factors
and the Mallat block fill pattern in Figure 8 appears in Table II.
9.7
WAVELET
DATA
6.10 1/BW
15.17 DATA
0.5
15.0 BIN
NUMBER
QUANTIZER - ENCODE MODE
TRNC
SIGNED
SIGNED
UNSIGNED
1/BW
QUANTIZER - DECODE MODE
23.8 DE-QUANTIZED
WAVELET DATA
SIGNED
UNSIGNED
8.8 BW
9.7
WAVELET
DATA
15.0 BIN
NUMBER
SIGNED
SAT
BW
Figure 7. Programmable Quantizer Data Flow
41
38
35
32
26
23
29
20
17
14
8
5
11
2
39
36
33
30
24
21
27
18
15
12
6
3
9
0
Y COMPONENT
40
37
34
31
25
22
28
19
16
13
7
4
10
1
Cb COMPONENT
Cr COMPONENT
LOW
HIGH
QUANTIZATION OF MALLAT BLOCKS
Figure 8. Typical Quantization of Mallat Data Blocks (Graphed)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV601JS12 制造商:Analog Devices 功能描述:Multiformat Video Codec 160-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:DIGITAL VIDEO CODEC REV 1.2 - Bulk
ADV601LC 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Ultralow Cost Video Codec
ADV601LCERAG1266B-0.5 制造商:Analog Devices 功能描述:
ADV601LCJST 制造商:Analog Devices 功能描述:Ultralow Cost Video Codec 120-Pin LQFP 制造商:Analog Devices 功能描述:IC VIDEO CODEC
ADV601LCJSTRL 制造商:Analog Devices 功能描述:Ultralow Cost Video Codec 120-Pin LQFP T/R
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