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ADV601LCJST View Datasheet(PDF) - Analog Devices

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Description
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ADV601LCJST
ADI
Analog Devices ADI
ADV601LCJST Datasheet PDF : 44 Pages
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ADV601LC
THE PROGRAMMABLE QUANTIZER
This block quantizes the filtered image based on the response
QUANTIZER - ENCODE MODE
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
ADV601LC achieves compression without compromising the
visual quality of the image. Figure 7 shows the encode and de-
9.7
WAVELET
DATA
SIGNED
15.17 DATA
SIGNED
UNSIGNED
0.5
6.10 1/BW
1/BW
TRNC
15.0 BIN
NUMBER
code data formats used by the quantizer.
QUANTIZER - DECODE MODE
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
15.0 BIN
NUMBER
SIGNED SIGNED
UNSIGNED
23.8 DEQUANTIZED
WAVELET DATA
SAT
9.7
WAVELET
DATA
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
8.8 BW
BW
range widely from high to low frequency block. (Note that the
fill is based on a log formula.) The relation between actual
Figure 7. Programmable Quantizer Data Flow
ADV601LC bin width factors and the Mallat block fill pattern
in Figure 8 appears in Table II.
Y COMPONENT
39 33
24
36 30
15
27
21
6
18
12
0
9
3
40 34
37 31
25
16
28 22
19
13
10
Cb COMPONENT
7
1
4
41 35
38 32
26
17
29 23
20
14
11
Cr COMPONENT
8
2
5
LOW
QUANTIZATION OF MALLAT BLOCKS
HIGH
REV. 0
Figure 8. Typical Quantization of Mallat Data Blocks (Graphed)
–7–
 

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