k*****e
发帖数: 22013 | 1 那是blur的边界效应。
模糊和清晰的边缘很难处理，
要么把清晰的部分带入到模糊地带（这就是帽子的光晕），
要么在该模糊的地方留下清晰的边缘。 |
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l*******s
发帖数: 26303 | 2 这个边界效应说真的我还从来没有注意到过。可以通过调节blur的参数把它减弱或者消
掉么？ |
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C******g
发帖数: 2930 | 3 Announced by Activision on Tuesday, Blur -- the latest racer from PGR dev
Bizarre Creations -- can be considered officially teased with the release of
a brief (but certainly not blurry) first look at it in motion. The teaser
appears specifically tailored to elicit the exact reaction we had when
viewing it for the first time; that is, "Wow, it looks like PGR," followed
by, "Whoa, what was that crazy blast?"
We know, of course, that it's the effect produced by one of the many Mario
Kart-style powe |
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w*******y
发帖数: 60932 | 4 I've been on the fence about buying Blur, but I just received a printable
coupon for $20 off.
Link:
http://www.blurgamepromotion.com/
I will post in-store deals once I have a chance to look for them, but since
it's a coupon, it should easily match up well with sales and other store
promotions.
It's served by coupons.com, so you can print two per computer.
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w*******y
发帖数: 60932 | 5 Kmart & Best Buy will have the Blur video game for Xbox 360 or PS3 for $39.
99 starting June 20th.
Use this coupon:
http://www.blurgamepromotion.com/
to get the game for $19.99.
to BlueLightSpcial for the coupon.
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w*******y
发帖数: 60932 | 10 Kershaw Ken Onion Black Blur Folding Knife with Speed Safe:
http://www.amazon.com/Kershaw-Folding-Knife-Speed-Handle/dp/B00
Product Features
Anodized aluminum handle
Speed safe and design
Removeable/reversible pocket clip
This item is not for sale in some specific zip codes
Product Description
3 3/8" 440A Stainless Steel partially serrated blade with Tungsten DLC black
coating. Anodized aluminum handle with Trac-Tec inserts. Equipped with
Speed Safe assisted opening design and a ... 阅读全帖 |
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w*******y
发帖数: 60932 | 11 Amazon has Kershaw Ken Onion Black Blur Folding Knife with Speed Safe for $
39.99:
http://www.amazon.com/gp/product/B004TB6RTE/ref=as_li_ss_tl?ie=
the next 4 hours. Click on Gold Box Offer button to see this price.
Serrated or smooth blade.
Features:
Anodized aluminum handle
Speed safe and design
3 3/8-Inch 440A stainless steel blade with tungsten DLC black coating
Removable/reversible pocket clip
Limited lifetime warranty
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f**d
发帖数: 768 | 12 这是一本计算神经科学的优秀著作，全文拷贝这里（图和公式缺），有兴趣的同学可以
阅读
如需要，我可以分享PDF文件（－－仅供个人学习，无商业用途）
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖 |
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s*******h
发帖数: 1361 | 13 You made it sound like motion blur is a good thing to have.
The only major game category where I see motion blur as an optional feature
are high speed racing games. Because objects move so fast you are traveling
large distances even within a single frame so there is huge discretization
of scenes. Motion blur can give you the feeling of traces for surrounding
objects and taillights, which is indeed mimicing how human eyes process
those so called lightspeed scenarios.
However it's basically cheati... 阅读全帖 |
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d****n
发帖数: 12461 | 14 第一眼，包装盒都不一样了。感觉好看了很多。两个版本的17-50都没送镜头套。
体积上大了很多，重量上差130g，不过没有想像得感觉大。
做工有好有坏。屁股附近变美观了。金色的塑料圈好像变成了金属圈。变焦环阻尼更大
，可能因为是新的缘故。比较遗憾的是对焦环很松，感觉比狗头还要差。前面有点晃。
其他方面还没仔细试，先试了试防抖。VC比VR吵，而且和VR一样，取景器会突然间跳动
然后稳定下来。50mm, f/2.8, 1/13s，各拍10张，下面是统计：
VC版关防抖
good or mild blurred 0
blurred 2
very blurred 8
VC版开防抖
good or mild blurred 7
blurred 3
very blurred 0
非VC版
good or mild blurred 2
blurred 1
very blurred 7
可见防抖是很有效果的。不过非VC版也抓到两张很清晰的照片。所以，有意思的问题就
是VC到底影响不影响画质？VC关闭是不是还影响画质？
目前在对焦，曝光上还有些问题，等到有机会了和锐度，边角等一起再测试。 |
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D****e
发帖数: 1122 | 15 问题是从图上看没差太多呀，但价格却几乎double了...
而且他们这对比很具误导性。首先，blur index的定义是什么，他们refer到了DxO的Bx
unit，太懒了，
其次，这blur index到底如何是否能定性衡量你得到的sharpness，如果能，又是如何
？，即blur index的1和2到底差了多少？
还有，全图都不到4的blur index，坐标轴做到了12，这种图老板肯定会骂的...
再有，blur index的理论最小值是1，坐标轴开到了了0是什么意思....
其实这个blur index基本上就是1/MTF50^2
至于MTF这种东西，本来小片幅的机器在数值上就占有(所以nikkor 1 18.5 f1.8的MTF
曲线高到吓人有木有，实际上呢...头倒是不错但是没有那么好）
所以DxO家推出了他们的P-Mix，企图能用一个参数衡量你用某个机身＋镜头最后得到的
图片到底多锐，
这个参数还是比较成功的。但是也不能完全说明问题，所以选镜头的时候只能作为参考
，还是用不同的头拍两张照片自己看看再选比较好。 |
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u******a
发帖数: 7843 | 16 我觉得你说的 motion blur 的缺点是因为目前 motion blur 的算法比较低级, 无法模
拟人眼. 人眼看不清移动的物体, 你把手指在眼前低速的晃动, 会发现人眼根本看不清
. 把人眼的焦点在两个不同的物体上切换, 你会发现除了聚焦完成在那两个物体之上的
时间, 其他视线移动的时间是完全看不清的. 人的视野有120 arc, 但能看清的只有6
arc. 正常人玩游戏, 屏幕不可能占满120 arc, 结果就是人眼可以极快的改变焦点, 导
致看清物体的速度比现实世界快得多, 从而产生一种奇怪感...比如你说的高速移动视
角并看清, 在游戏里很常见, 但事实上在现实中, 人眼不具备在移动视角时看清物体的
能力. 要完美的模拟, 大概要用类似 google glass 的装置对瞳孔进行 motion
capture, 然后动态调整显示的内容, 保证只有焦点处的6 arc 是清晰的. 以上都是瞎
想的, 但是我觉得有一定的道理.
至于你说的显示器的 blur reduction, 本质是减少残像吧. 残像导致的 blur 和曝光
导致的 blur 有本质的不同, 前者是因为显示... 阅读全帖 |
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b********e
发帖数: 431 | 17 01. The Smiths – The Queen Is Dead
02. The Beatles – Revolver
03. David Bowie – Hunky Dory
04. The Strokes – Is This It
05. The Velvet Underground – The Velvet Underground & Nico
06. Pulp – Different Class
07. The Stone Roses – The Stone Roses
08. Pixies – Doolittle
09. The Beatles – The Beatles
10. Oasis – Definitely Maybe
11. Nirvana – Nevermind
12. Patti Smith – Horses
13. Arcade Fire – Funeral
14. David Bowie – Low
15. PJ Harvey – Let England Shake
16. Joy Division – Closer
17. Public Enemy ... 阅读全帖 |
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w******t
发帖数: 16937 | 18 分特，想看专业的？
看这个。声明：因为网络安全原因，我删去了一些必须删去的内容。
http://schema.org/WebPage">Google
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