w***g
发帖数: 5958 | 1 原来的lossy压缩了，鸡毛png codec默认是lossless的。 |
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z****o
发帖数: 368 | 2 word里面的图片用Adobe Acrobate转换时，怎么保持resolution? 试了改 >Edit>
Preference>Convert to PDF>TIFF>Edit Setting>Compression 里都改为最高lossless
。 出来的文件没什么变化，size也一样。 |
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w****a
发帖数: 186 | 4 PNG is an alternative solution for GIF with more flexible options. Basically
it's lossless and still has a big compression ratio. Recommend it. |
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C*S
发帖数: 135 | 5 Really, lossless. It's really cool. I'm going to try it next time. |
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s******g
发帖数: 157 | 6 【 以下文字转载自 JobHunting 讨论区 】
发信人: striling (anti cnn), 信区: JobHunting
标 题: 问个DFT的问题
发信站: BBS 未名空间站 (Sun Feb 22 01:24:03 2009)
DFT 和 discrete radon transform，那个是information lossless的？ 或者两者都是
lost information?
谢了啊 |
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z*****n
发帖数: 7639 | 7 dont known discrete random transform, but DFT is lossless. |
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g******u
发帖数: 3060 | 8 在高功率电路里，当然要用，比如LLC.甚至于还要lossless snubber,当然，我见识浅
陋。。。
在一般功率里（比如低于200瓦），可以选那种transition mode chip，类似ST的L6565
之类，这种芯片工作模式就是几乎无turn on loss,turn-off loss也可以通过很简单的
snubber来减小。所以不用很复杂就可以做到很接近的soft switching.某些杂志上有些
苦心写出来的所谓ZVZCS的电路，我相当怀疑工业界有这种8到12个resonant模式的东西。
效率是提高不了多少的，我上次花了近3周，才把一个65W的效率提高了2％。但是
heatsink毕竟小一点是一点。有个老头说，你加snubber,soft switching之类做到极点
，还不如一个layout画得好。 |
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g******u
发帖数: 3060 | 9 还有个问题是问题要问清楚。
本来看起来楼主想做系统，所以我说最简单就是怎么做。
然后看起来要做IC, 也不知怎么个要求。
我毫不怀疑版上有很多牛人如果搞个一二年，可以设计出个多级buck，超级稳定，全部
集成在IC内部，multi-resonant+synchronous recification+lossless snubber，从１
００V降到２V的芯片，倾倒众生。
我只是说如果要３天内全部设计好是个什么做法，我也只懂这个。 |
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g****t
发帖数: 31659 | 10 80年代开始，lossless switching + capacitor + charge
为关键字的文章就有一大批了。
水灌到现在，其实多数文章已经没有多少实际意义了。
这玩意儿最后实际上是声称自己能算各种分段积分。
Transcation上有过几篇挺好的综述。
给电容充电，根据我对文献的理解，减少能耗思路只有两种。
一种是用电感，一种是在电容0电压时候切换电流。
哥们，这个方向非常玄虚啊，一想之下是非常有道理。理想无电阻是一直震荡，可是完
全可以瞬态关掉达到最大效率。
的。 |
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g****t
发帖数: 31659 | 11 80年代开始，lossless switching + capacitor + charge
为关键字的文章就有一大批了。
水灌到现在，其实多数文章已经没有多少实际意义了。
这玩意儿最后实际上是声称自己能算各种分段积分。
Transcation上有过几篇挺好的综述。
给电容充电，根据我对文献的理解，减少能耗思路只有两种。
一种是用电感，一种是在电容0电压时候切换电流。
哥们，这个方向非常玄虚啊，一想之下是非常有道理。理想无电阻是一直震荡，可是完
全可以瞬态关掉达到最大效率。
的。 |
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n******h
发帖数: 2544 | 13 I read his question again. The systems use a constant current source. Well,
first I guess he meant constant amplitude AC current source, DC constant
source won't have practical meaning in transformer.
The system loss definitely goes higher. But if the question is about the
loss in primary coil:
If current flows into primary coil is constant, then the loss in it should
be constant, at first order. It is I^2*Rp. This assumes frequency is not too
high and every component is still in their comfortab... 阅读全帖 |
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f*******d
发帖数: 339 | 14 The observed superluminal light pulse propagation is not at odds with causality,
being a direct consequence of classical interference between its different frequency components in an
anomalous dispersion region.
...
Finally, we note that the observed superluminal light pulse propagation is not at odds with causality or
special relativity. In fact, the very existence of the lossless anomalous dispersion region given in
equation (1) is a result of the Kramers-Kronig relation which itself is based |
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w*******y
发帖数: 60932 | 17 Logitech Squeezebox Radio is for $125 + $7.99 shipping with the coupon code
STLISTEN
Regular price is $250
LINK:
https://www.electronics-expo.com/index.php?page=item&id=LOG930000101
&extra=a:2:{i:0;s:40:"
03823345592a403b2f4a37a59384e7ab28f02be1";i:1;s:0:"";}
* Speakers and amplifier
o inch high-definition, soft-dome tweeter and 3-inch high-power,
long-throw woofer
o Bi-amplified class D design with digital electronic crossover
... 阅读全帖 |
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w*******y
发帖数: 60932 | 18 Link:
http://www.sears.com/shc/s/p_10153_12605_05757965000P
Product Description
Sharp AQUOS BD-HP24U - Blu-ray disc player - upscaling - Netflix
Now you can enjoy the best of 1080p video on your AQUOS LCD TV. Especially
designed to work with AQUOS LCD TVs, the BD-HP24U AQUOS Blu-ray Disc player
provides seamless operability via the AQUOS LINK function through the HDMI
connection. Performing as if it were all one system, the BD-HP24U's Quick
Start feature lets you enjoy gorgeous Blu-ray Disc vide... 阅读全帖 |
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w*******y
发帖数: 60932 | 19 This system is a like-new refurb sold directly from Onkyo's official online
store. I've purchased a refurbished receiver from them in the past and it
was in perfect condition. I posted a deal for this system from Newegg.com
yesterday and it sold out. So for those who missed it, this is definitely a
viable (and maybe better) option.
For a NIB product, the price has never been below $269.99 from what I'm
finding during a quick search. Next lowest is $298 on Google Products from
a reputable sel... 阅读全帖 |
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w*******y
发帖数: 60932 | 20 Link:
http://www.walmart.com/ip/Vizio-E320VL/13904831
Price just lowered from 348 to 298
better than similar tv at amazon - 50000 contrast ratio vs 100000 contrast
ratio
VIZIO 32" LCD HDTV:
* 32" LCD panel
With a 1366 x 768 Full HD resolution
* Wide 178-degree vertical and 178-degree horizontal angles
See a clear picture on the VIZIO 32" LCD HDTV from anywhere in the
room
* High brightness of 450 nits
Place your VIZIO LCD HDTV anywhere
* 100,000:1 dynamic contr... 阅读全帖 |
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w*******y
发帖数: 60932 | 21 Link:
http://www.cowboom.com/deal-of-the-day.cfm
It's Cowboom, it will go in and out of stock.
Description: This iPod delivers everything you love about iPod with added
features all wrapped in a tiny 4.9 oz. package. A brighter display, enormous
80GB capacity and full-length movie playback take the iPod experience to a
whole new level. Product Features 80GB* hard drive stores up to 20,000 songs
(128 Kbps AAC), 25,000 photos or up to 100 hours of video Ultrathin player
measures just 0.41" deep a... 阅读全帖 |
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w*******y
发帖数: 60932 | 22 I normally don't pre-post, but this receiver is already priced below other
sellers. At 6:20 PM EST (3:20 Pacific), Amazon will be offering an
additional discount. Most likely it will be around 50% off ($425), but could
be even lower.
Gold box link
product link
Link:
http://www.amazon.com/gp/product/B003K51IPI
Description
Onkyo HT-RC270 7.2-Channel Network A/V Receiver (Black)
by Onkyo
List Price: $849.00
Price: $499.99 & eligible for free shipping with Amazon Prime
You Save: $349.01 ... 阅读全帖 |
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w*******y
发帖数: 60932 | 23 Apple iPod shuffle 2 GB Blue (4th Generation) NEWEST MODEL:
http://www.amazon.com/Apple-shuffle-Silver-Generation-NEWEST/dp
Technical Details
Color: Blue
* 2 GB capacity for about 500 songs
* Up to 15 hours of audio playback on a single charge
* Easy-to-use control pad for playing your music, audiobooks, and
podcasts
* Support for AAC, Protected AAC (iTunes Store), MP3, MP3 VBR, Audible,
Apple Lossless, AIFF, and WAV audio formats
* One-year limited warranty
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w*******y
发帖数: 60932 | 24 6ft HDMI 1.3V Premium Cable for Full HD 1080P Deep Color:
http://www.shop4tech.com/item7249.html
code ES15 gets you 15% off / exp 3/20/11
Specifications:
HDMI 1.3 is backward compatible with v. 1.1 and 1.2
Length: 6ft
HDMI 1.3 increased its single-link bandwidth from 165 MHz (4.95 gigabits
per second) to 340 MHz (10.2 Gbps) to support the demands of future high
definition display devices, such as higher resolution, Deep Color, and high
frame rates.
HDMI 1.3 supports 30-bit, 36-bi... 阅读全帖 |
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w*******y
发帖数: 60932 | 25 add to cart for $189.00 + Free Shipping to store
walmart.com:
http://www.walmart.com/catalog/product.do?dest=9999999997&produ
Viore 24" Class LCD 1080p 60Hz HDTV, LC24VXF60PB in Piano Black:
16:9 LCD panel
With 1920 x 1080 resolution and an 800:1 contrast ratio
Built-in ATSC tuner
Tune in to over-the-air digital HDTV broadcasts right out of the box
800:1 contrast ratio
With a high contrast ratio, you get brighter whites, deeper blacks and
bolder colors
300 cd/m2 brightness
The Viore 24" 1080p LC... 阅读全帖 |
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w*******y
发帖数: 60932 | 26 ASUS VH238H Black 23" Full HD HDMI LED Backlight LCD Monitor w/Speakers 250
cd/m2 ASCR 50,000,000:1
$20 off w/ promo code EMCYTZT400, ends 4/14
The VH238H by ASUS mixes visual excitement with modern sophistication.
Powered by LED backlight technology, the VH238H delivers sharp, true-to-life
images with 2ms speedy response time and ASUS Smart Contrast Ratio that
dynamically adjusts the displays contrast ratio according to the image
content, up to an astonishing 50,000,000:1. Full HD 1080p (1920x1... 阅读全帖 |
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w*******y
发帖数: 60932 | 27 Title says it all really... $249 is $50 cheaper than even the best online
price, so I snatched one right up!
Online link for Fry's (but price is NOT available online):
Link:
http://www.frys.com/product/6553583
Details:
Built to exacting standards to bring the best out of your music, movies, and
gaming content, Onkyos HT-S3400 packs a full-featured A/V receiver coupled
with a quality six-piece speaker set. To handle the latest Blu-ray, gaming,
and cable/satellite devices, the receiver sports four... 阅读全帖 |
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w*******y
发帖数: 60932 | 28 El Linko: Link:
https://www.shoponkyo.com/detail.cfm?productid=HT-RC230&modelid=27&group_id=
1&detail=1&ext_war=1
The Ideal Choice for Newcomersa 3-D Home Theater Centerpiece
At the budget-conscious end of the home entertainment spectrum, youre
looking to maximize performance and features without putting undue strain on
your finances. At Onkyo, we get it. Thats why weve redefined the entry-
level A/V receiver once more, with the high-value HT-RC230. Not only is it
ready for the 3D videothanks to... 阅读全帖 |
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w*******y
发帖数: 60932 | 29 Link:
https://www.shoponkyo.com/detail.cfm?productid=HT-RC230&modelid=24&group_id=
1&detail=1
for new members join club Onkyo $100 otherwise $110
includes 15% disc for today only
I live in FL shipped $106.63 ($6.98 tax)
this has been posted before but not w/ 15% discount
Amplifier Section
Power Output* (8 ohm, 20 Hz-20 kHz, FTC)
Front L/R 60 W/Ch
Center 60 W
Surround L/R 60 W/Ch
Surround Back
Power Output* (6 ohm, 1 kHz, FTC)
Front L/R -
Center -
Surround L/R -
Surround ... 阅读全帖 |
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w*******y
发帖数: 60932 | 30 frys is blowing out audio. Seems to be Y.M.M.V. because shipping shows
unavailable.
retail $1299 Frys price $599
The TX-NR1008 is an upper-mid-range A/V powerhouse designed to give you
maximum set-up flexibility in the home. Its 9.2 speaker channels let you
enjoy a multichannel source in your main room, plus powered audio in two
other rooms. Or you can use the extra channels to take full advantage of the
new surround dimensions of Audyssey DSX(TM) and DolbyPro LogicIIz.
Other processing highligh... 阅读全帖 |
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w*******y
发帖数: 60932 | 31 registration name:tipradar
registration code:000HX4-GFU326-79T9YX-V4FCB6-HKM650-N6YMRQ-N76Z9R
Link:
http://www.anvsoftware.com/giveaway.html
quote
Backup encrypted DVD movies as copy DVD disc, DVD folder, ISO files on your
computer. It's flexible to choose main movie or full disc to copy.
Features
Remove all DVD copy protections including CSS, RC, RCE, APS, UOPs, etc.
Removing different DVD copy protections like CSS, RC, RCE, APS, UOPs, ARccOS
and so on
Decrypted protected DVD movies with lossle... 阅读全帖 |
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w*******y
发帖数: 60932 | 32 Apple Apple TV (Limit Three Per Customer):
http://www.macconnection.com/IPA/Shop/Product/Detail.htm?sku=12
code SHIPTV7 gets you $7 off
Connectivity
Connector Type USB
Connector Type HDMI
Connector HDMI
Connector RJ-45
Connector 3.5mm optical audio
Connector microUSB
Connector Type Ethernet
Connector Type Digital audio (optical)
General
Color Black
Video
Digital Video Capture Resolution 1280 x 720
Actual Weight 0.60 lb(s)
Compatibility ... 阅读全帖 |
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w*******y
发帖数: 60932 | 33 Link:
https://www.shoponkyo.com/detail.cfm?productid=HT-RC230&modelid=24&group_id=
1&detail=1
for new members join club Onkyo $102 otherwise $112
Amplifier Section
Power Output* (8 ohm, 20 Hz-20 kHz, FTC)
Front L/R 60 W/Ch
Center 60 W
Surround L/R 60 W/Ch
Surround Back
Power Output* (6 ohm, 1 kHz, FTC)
Front L/R -
Center -
Surround L/R -
Surround Back
Dynamic Power** (front)
3 ohm 160
4 ohm 125
8 ohm 85
THD (Rated Power) 0.7 % (2 channels driven)
Damping Factor (1 kHz, 8 ohm) 60
Input Sensitivit... 阅读全帖 |
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w*******y
发帖数: 60932 | 34 Onkyo TX-NR709 7.2-Channel Network A/V Receiver (Black):
http://www.amazon.com/gp/product/B004V8KWQO?smid=ATVPDKIKX0DER
Technical Details
110 Watts per Channel at 8 Ohms, 20 Hz-20 kHz, 0.08%, 2 Channels Driven,
FTC;
HDMI Support for 3D, Audio Return Channel, Deep Color, x.v.Color, Lip
Sync
HDMI Video Upscaling to 4K with Qdeo Technology by Marvell
Playback of Audio Files Through Local Network (MP3, WMA, WMA Lossless,
FLAC, WAV, Ogg Vorbis, AAC, LPCM)
THX Select2 Plus Certifie... 阅读全帖 |
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f**n
发帖数: 155 | 35 目前在做这方面的课题，可是看不清研究的方向。
哪位兄弟点拨一二，现在Image Compression有哪些方面可以做的。
我看到lossy和lossless都已经有标准了。 |
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B******m
发帖数: 2643 | 36 还有一个想法，虽然lossy和lossless都有标准了。但是应用具体标准实现的软件水的都
互相不一样。所以在具体应用方面，前景还是比较好的。 |
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t******q
发帖数: 117 | 37 It is a little bit off road, they talk about image, I move to
video compression more.
Why? because in video compression, though the transformation part is still
the heart of compession, but it is not the most time consuming part of
entire compression scheme. And it does not control over the compression
mostly.
For speed/compression issue, the predict coding is the killer part.
First, therer are lossles compression and lossy compression.
Lossless compression is used in medical image processing, s |
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s**d
发帖数: 18498 | 38 多谢loop。
这儿有人做lossless image compression的吗？ |
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