Attachment 232 Details for Bug 45 – Mail about the new ZYWRLE encoding

Mail about the new ZYWRLE encoding

ZYWRLE.txt (text/plain), 3.71 KB, created by Peter Åstrand on 2007-02-01 09:17:07 CET

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Creator: Peter Åstrand

Created: 2007-02-01 09:17:07 CET

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patch

obsolete

>From micro-vnc@ias.hitachi-system.co.jp Thu Feb  1 08:45:54 2007
>Date: Thu, 1 Feb 2007 14:18:00 +0900
>From: "Hitachi Systems & Services, Ltd." <micro-vnc@ias.hitachi-system.co.jp>
>To:  <vnc-list@realvnc.com>
>Subject: Introduction of New VNC codec
>Resent-Date: Thu, 01 Feb 2007 08:48:37 +0100
>Resent-From: "Claudio Coletta" <md1137@mclink.it>
>Resent-To: vnc-tight-list@lists.sourceforge.net
>
>Dear VNC developer.
>
>
>                  Introduction of
>  "ZYWRLE":Enhanced VNC codec for Motion picture
>
>
>1. Introduction
> The lossy codec based on Wavelet transform is frequently
>used in compression of natural image, motion picture and
>audio stream.
> But it isn't almost used in Remote Desktop protocol like
>VNC because classical lossless run-length codec like ZRLE
>has high performance in peculiar image which has big mono
>color region like desktop image. The lack of lossy codec
>cause low performance of motion picture in VNC.
> We introduce new codec "ZYWRLE(ZLib YUV Wavelet Run Length
>Encoding)" which applied wavelet transform partially and
>is based on ZRLE. In this new codec, network traffic reduced
>to 15%-50% traffic of ZRLE when we play motion picture. 
>
>
>2. Highlight of Evalution of ZYWRLE
>
>               Result of ZYWRLE for motion picture
>+-------+-------------------+------------------+------------------+
>|quality|  Raw tile(Mbytes) |   Total(Mbytes)  |Raw tile|PSNR(RGB)|
>|       |  Out | Raw  |rate | Comp.|  Raw |rate| rate(%)|   (dB)  |
>+-------+------+------+-----+------+------+----+--------+---------+
>| ZRLE  |125.8 |125.8 |100  |117.1 |392.2 |29.8|  32.1  |   INF.  |
>|  Hi   | 53.85|167.58| 32.1| 52.10|370.96|14.0|  45.1  |  28.025 |
>| Mid   | 31.83|264.05| 12.1| 20.56|378.50| 5.4|  69.7  |  23.980 |
>+-------+------+------+-----+------+------+----+--------+---------+
>
>* Comp. rate of ZRLE(about 30%) goes to 15%(Hi-quality)/5%(Mid-quality)! 
>
>
>3. Reference Implementation(C source code/patch for VNC Servers)
>  * Core Codec of ZYWRLE
>      http://mobile.hitachi-system.co.jp/publications/ZYWRLE/zywrletemplate.c
>  * Patch for Ultr@VNC V1.0.2
>      http://mobile.hitachi-system.co.jp/publications/ZYWRLE/UltraVNC-102-ZYWRLE-diff.txt
>  * Patch for LibVNCServer 0.8.2
>      http://mobile.hitachi-system.co.jp/publications/ZYWRLE/LibVNCServer-0.8.2-ZYWRLE-diff.txt
>
>I think that Any VNC server can be applied ZYWRLE easlilly using one of these patch. 
>
>
>4. License of ZYWRLE
> Though ZYWRLE is our intellectual property and was developed for
>our micro-VNC, We Hitachi Systems & Services, Ltd. decided make it
>open source. You can use it with no fee for commercial and/or 
>non-commercial purpose. The above reference implementation are released
>under our BSD-like license. More detail, see top of zywrletemplate.c. 
>
>
>5. More detail
> See our ZYWRLE page(http://mobile.hitachi-system.co.jp/publications/ZYWRLE/)
>
>We are glad if your VNC server supports ZYWRLE.
>
>Thank you.
>
>---
>Noriaki Yamazaki
>Administrator of micro-VNC
>
>Research & Developement center
>Hitachi Systems & Services, Ltd.
>_______________________________________________
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>VNC-List@realvnc.com
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>http://www.realvnc.com/mailman/listinfo/vnc-list
>
>
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