Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

ADV611 Fiches technique(PDF) 5 Page - Analog Devices

No de pièce ADV611
Description  CLOSED CIRCUIT TV DIGITAL VIDEO CODEC
Download  46 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADV611 Fiches technique(HTML) 5 Page - Analog Devices

  ADV611 Datasheet HTML 1Page - Analog Devices ADV611 Datasheet HTML 2Page - Analog Devices ADV611 Datasheet HTML 3Page - Analog Devices ADV611 Datasheet HTML 4Page - Analog Devices ADV611 Datasheet HTML 5Page - Analog Devices ADV611 Datasheet HTML 6Page - Analog Devices ADV611 Datasheet HTML 7Page - Analog Devices ADV611 Datasheet HTML 8Page - Analog Devices ADV611 Datasheet HTML 9Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 46 page
background image
ADV611/ADV612
–5–
REV. 0
BLOCK A IS HIGH PASS IN X AND DECIMATED BY TWO.
BLOCK B IS HIGH PASS IN X, HIGH PASS IN Y, AND DECIMATED BY EIGHT.
BLOCK C IS HIGH PASS IN X, LOW PASS IN Y, AND DECIMATED BY EIGHT.
BLOCK D IS LOW PASS IN X, HIGH PASS IN Y, AND DECIMATED BY EIGHT.
BLOCK E IS HIGH PASS IN X, HIGH PASS IN Y, AND DECIMATED BY 32.
BLOCK F IS HIGH PASS IN X, LOW PASS IN Y, AND DECIMATED BY 32.
BLOCK G IS LOW PASS IN X, HIGH PASS IN Y, AND DECIMATED BY 32.
BLOCK H IS HIGH PASS IN X, HIGH PASS IN Y, AND DECIMATED BY 128.
BLOCK I IS HIGH PASS IN X, LOW PASS IN Y, AND DECIMATED BY 128.
BLOCK J IS LOW PASS IN X, HIGH PASS IN Y, AND DECIMATED BY 128.
BLOCK K IS HIGH PASS IN X, HIGH PASS IN Y, AND DECIMATED BY 512.
BLOCK L IS HIGH PASS IN X, LOW PASS IN Y, AND DECIMATED BY 512.
BLOCK M IS LOW PASS IN X, HIGH PASS IN Y, AND DECIMATED BY 512.
BLOCK N IS LOW PASS IN X, LOW PASS IN Y, AND DECIMATED BY 512.
N
M
L
K
I
H
J
G
F
E
C
B
D
A
Figure 5. Modified Mallat Diagram (Block Letters Correspond to Those in Filter Tree)
ENCODE
PATH
DECODE
PATH
WAVELET
KERNEL
FILTER BANK
ADAPTIVE
QUANTIZER
RUN LENGTH
CODER &
HUFFMAN
CODER
COMPRESSED
DATA
Figure 4. Encode and Decode Paths
References
For more information on the terms, techniques and underlying
principles referred to in this data sheet, you may find the follow-
ing reference texts useful. A reference text for general digital
video principles is:
Jack, K., Video Demystified: A Handbook for the Digital Engineer
(High Text Publications, 1993) ISBN 1-878707-09-4
Three reference texts for wavelet transform background infor-
mation are:
Vetterli, M., Kovacevic, J., Wavelets And Subband Coding
(Prentice Hall, 1995) ISBN 0-13-097080-8
Benedetto, J., Frazier, M., Wavelets: Mathematics And Applica-
tions (CRC Press, 1994) ISBN 0-8493-8271-8
Grossman, A., Morlet, J., Decomposition of Hardy Functions into
Square Integrable Wavelets of Constant Shape, Siam. J. Math.
Anal., Vol. 15, No. 4, pp 723-736, 1984
THE WAVELET KERNEL
This block contains a set of filters and decimators that work on
the image in both horizontal and vertical directions. Figure 8
illustrates the filter tree structure. The filters apply carefully
chosen wavelet basis functions that better correlate to the broad-
band nature of images than the sinusoidal waves used in Dis-
crete Cosine Transform (DCT) compression schemes (JPEG,
MPEG, and H261).
An advantage of wavelet-based compression is that the entire
image can be filtered without being broken into sub-blocks as
required in DCT compression schemes. This full image filtering
eliminates the block artifacts seen in DCT compression and
offers more graceful image degradation at high compression
ratios. The availability of full image subband data also makes
image processing, scaling, and a number of other system fea-
tures possible with little or no computational overhead.
The resultant filtered image is made up of components of the
original image as is shown in Figure 5 (a modified Mallat Tree).
Note that Figure 5 shows how a component of video would be
filtered, but in multiple component video, luminance and color
components are filtered separately. In Figure 6 and Figure 7 an
actual image and the Mallat Tree (luminance only) equivalent is
shown. It is important to note that while the image has been
filtered or transformed into the frequency domain, no compres-
sion has occurred. With the image in its filtered state, it is now
ready for processing in the second block, the quantizer.
Understanding the structure and function of the wavelet filters
and resultant product is the key to obtaining the highest perfor-
mance from the ADV611/ADV612. Consider the following
points:
• The data in all blocks (except N) for all components are high
pass filtered. Therefore, the mean pixel value in those blocks
is typically zero and a histogram of the pixel values in these
blocks will contain a single “hump” (Laplacian distribution).
• The data in most blocks is more likely to contain zeros or
strings of zeros than unfiltered image data.
• The human visual system is less sensitive to higher frequency
blocks than low ones.
• Attenuation of the selected blocks in luminance or color com-
ponents results in control over sharpness, brightness, contrast
and saturation.
• High quality filtered/decimated images can be extracted/created
without computational overhead.
Through leverage of these key points, the ADV611/ADV612
not only compresses video, but offers a host of application
features. Please see the Applying the ADV611/ADV612 section
for details on getting the most out of the ADV611/ADV612’s
subband coding architecture in different applications.


Numéro de pièce similaire - ADV611

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
ADV611 AD-ADV611_15 Datasheet
1Mb / 46P
   Closed Circuit TV Digital Video Codec
REV. 0
More results

Description similaire - ADV611

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
ADV611 AD-ADV611_15 Datasheet
1Mb / 46P
   Closed Circuit TV Digital Video Codec
REV. 0
ADV612 AD-ADV612_15 Datasheet
1Mb / 46P
   Closed Circuit TV Digital Video Codec
REV. 0
logo
NTE Electronics
NTE856 NTE-NTE856 Datasheet
22Kb / 3P
   Integrated Circuit TV Video Modulation Circuit
NTE1747 NTE-NTE1747 Datasheet
31Kb / 3P
   Integrated Circuit TV Video Processing Circuit
NTE1080 NTE-NTE1080 Datasheet
19Kb / 2P
   Integrated Circuit TV Video Processor
NTE1845 NTE-NTE1845 Datasheet
25Kb / 3P
   Integrated Circuit TV Video Processor
logo
STMicroelectronics
TEA2014 STMICROELECTRONICS-TEA2014 Datasheet
118Kb / 3P
   VIDEO SWITCHING CIRCUIT FOR TV
logo
NTE Electronics
NTE846 NTE-NTE846 Datasheet
22Kb / 3P
   Integrated Circuit TV Video Modulator
NTE1771 NTE-NTE1771 Datasheet
23Kb / 3P
   Integrated Circuit TV Video Processor
NTE1164 NTE-NTE1164 Datasheet
20Kb / 2P
   Integrated Circuit TV Video Signal Processing Circuit
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com