s*****e
发帖数: 21415 | 1 我研究了一下发现主要问题是开了DC以后光路变了，somehow从镜头到对焦屏的
距离和到CMOS的距离不等长，正常应该是等长的。。
所以我发现我在对焦屏里看的都似乎清楚的，照片出来就有点糊。用LV，WYSIWYG
就没有这个问题 |
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s*****e
发帖数: 21415 | 2 可以验证一下135DC在D700上有没有这个问题 |
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t****g
发帖数: 35582 | 10 一般是椭圆或者双曲线。
detector是不是针孔看你detector够不够小。
比如你的detector是个polished fiber end，最大一般也就是100-200um，球差一大
injection loss就很厉害了。更不要说更小的单模光纤了。
如果是个photodiode，一般active aera几个mm^2是有的，那有些像差甚至defocus都无
所谓。 |
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s**********o
发帖数: 105 | 12 弱问什么是大光圈?
跟镜头有关?镜头是标准的14-42mm的 |
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d******n
发帖数: 3014 | 17 Photo Rumors
Photography news, before it happens
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Sony RX1 full press release
By PR admin | Published: September 11, 2012
Here is the full press release for the Sony RX1 full frame compact camera:
Sony Introduces the World’s First Full-Frame Compact Digital Camera
New Compact Cyber-shot? RX1 Camera features 35mm full-frame image sensor and
wide aperture f/2 lens
SAN DIEGO, Sept 12, 2012 – For the first time, all the benefits of f... 阅读全帖 |
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q*z
发帖数: 13362 | 18 通过defocus的图像是不可能精确计算出物体距离的.用概率的方法是比较常见的做法.
类似的问题还有高感去噪,图片放大,可以注意到sony的算法利用概率来猜图. |
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a**a
发帖数: 161 | 19 当然不是精确算出，这个是和光学聚焦一起用的，用defocus图像估计下一个新聚焦点
，然后把光学镜头直接移到那个位置再用同样方法迭代。最后找到的就是真的焦点，不
是猜的焦点。唯一的缺点就是要对每个镜头都要把整个聚焦曲线都测一遍，比较麻烦。 |
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q*z
发帖数: 13362 | 21 从理论上来讲，defocus的图像是无法准确逆推出焦点的。从文章的描述我们可以看出
，松下实际上用的是概率加模式识别的方法，建立一个不同场景的数据库，识别以后用
概率来猜焦点位置。猜对了固然快了，猜错了呢？可以想象对焦的使用会是忽快忽慢。
sensor集成相位点这种软硬结合，稳定的解决方案才是方向，硬件技术不行，靠这种概
率算法忽悠不是长久之计啊。 |
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e**n
发帖数: 5876 | 22 算法肯定不一样. 尤其是GH4,用了全新的Depth From Defocus, 追焦非常厉害.
refresh rate可能也不同 |
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l*h
发帖数: 4124 | 24 收拾了一下，我乃康的东西还真不少，胶片的有F3和F100，数码的从D70s开始买的，现
在还有D200，D300s，D700和D7100，乃康原厂的定焦头有50 f/1.4和135mm defocus
control，tamron的90mm macro，原厂的两个AF-S 的fast zoom，DX头有16-85mm和18-
200mm，17-50 f/2.8。三个闪灯还是很好玩的。
看来暂时不买了。 |
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g****g
发帖数: 1828 | 25 Depending on how you use it, email communication can be a way to interact
effectively with people and make your work more efficient, or a major source
for decreased productivity, stress and an early ulcer. Unfortunately, for
many, it’s the latter.
As a communication coach, I am often asked be people looking to improve
their business communication skills: “How many times should I check my work
email each day?” Then they look at me with astonishment as I reply that
twice every day is usually the o... 阅读全帖 |
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b*s
发帖数: 82482 | 26 Galaxy也不是这回事：
As good as smartphone cameras have gotten, they struggle to capture photos
with a high degree of bokeh — where the background is kept artistically out
of focus while the subject in the foreground is nice and sharp. But the
Samsung Galaxy S5 has a neat feature where you can simulate the effect.
In some picture-taking modes, the GS5 lets you designate a specific subject;
tap the person or object you want to be in focus and snap the pic. Once you
've got it, you can open the pic in Po... 阅读全帖 |
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r*s
发帖数: 2555 | 27 尼玛87篇参考文献就不能加一篇施教授或能教授的CNS？
References
1. Ruska, E., Nobel Lectures, Physics 1981-1990, Tore Frängsmyr and
Gösta Ekspong, Eds. (1993) World Scientific Publishing, Singapore
2. Marton, L. (1934) Electron microscopy of biological objects. Nature
133, 911-911
3. Althoff, T., Mills, D. J., Popot, J. L., and Kühlbrandt, W. (2011)
Arrangement of electron transport chain components in bovine mitochondrial
supercomplex I1III2IV1. The EMBO Journal 30, 4652-4664
4. Letts, J. A., Fied... 阅读全帖 |
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h*d
发帖数: 19309 | 28 发信人: strong (大拿~恭祝清华百年华诞), 信区: TsinghuaCent
标 题: 清华大学的2010
发信站: 水木社区 (Sun Apr 24 14:46:09 2011), 站内
清华大学的2010
注：本文由水木社区BBS世纪清华版（TsinghuaCent）整理，各项资料来自清华大学网
站、清华大学新闻网、北京协和医学院（清华大学医学部）网站和水木社区BBS世纪清
华版等。
正文：
本文系统总结2010年度清华大学、北京协和医学院（清华大学医学部）师生校友荣获的
各类学术和社会荣誉、学科竞赛成绩以及学校在教学科研领域中获得的各类成果和进展
。限于篇幅，在关于各类获奖成果的统计中，本文仅统计获得过一等奖、金奖（国家科
学技术奖除外）以上的成果（绩）。
*********************
一．最高荣誉
●清华大学数学科学中心主任丘成桐教授获得2010年沃尔夫（Wolf）奖，以表彰他在几
何分析领域的贡献，以及在几何和物理的多个领域都产生的“深刻而引人注目的影响”
。这是丘成桐继1982年获得菲尔茨奖后，再... 阅读全帖 |
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w****2
发帖数: 12072 | 29 Stevey's Google Platforms Rant
I was at Amazon for about six and a half years, and now I've been at Google
for that long. One thing that struck me immediately about the two companies
-- an impression that has been reinforced almost daily -- is that Amazon
does everything wrong, and Google does everything right. Sure, it's a
sweeping generalization, but a surprisingly accurate one. It's pretty crazy.
There are probably a hundred or even two hundred different ways you can
compare the two companies... 阅读全帖 |
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o**n
发帖数: 1249 | 30 pcman file manager的一个非常严重可重复性的bug，
在同一个目录下，选中一个文件，ctrl+c，不点空白处使选中的文件defocus，ctrl+v
，一
个对话框跳出来让你命名copy的同名文件，此时不管你新命名，还是取消copy，原文件
都变成0长度，无法恢复回来。
这个问题是我有了血泪教训才知道的，害我丢了重要文件阿。
我向那个台湾的作者report bug，他没理我，555
大家有没有其他lightweight的file manager推荐，最好是gtk的，特别喜欢pcman-fm的
一个功能是F4启动一个terminal在当前目录，gnome自己带的那个又慢又差。 |
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s******y
发帖数: 17729 | 31 【 以下文字转载自 Military 讨论区 】
发信人: rbs (jay), 信区: Military
标 题: 诺委会太不像话了 (转载)
发信站: BBS 未名空间站 (Wed Oct 4 10:58:51 2017, 美东)
发信人: rbs (jay), 信区: Joke
标 题: 诺委会太不像话了
发信站: BBS 未名空间站 (Wed Oct 4 10:23:52 2017, 美东)
尼玛87篇参考文献就不能加一篇施教授或能教授的CNS？
References
1. Ruska, E., Nobel Lectures, Physics 1981-1990, Tore Frängsmyr and
Gösta Ekspong, Eds. (1993) World Scientific Publishing, Singapore
2. Marton, L. (1934) Electron microscopy of biological objects. Nature
133, 911-911
3. Althoff, T., Mi... 阅读全帖 |
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x*******i
发帖数: 32 | 32 You are using a home-made Raman instrument right? For confocal Raman
instruments from major vendors, you do not need to consider how to measure
the distance of the focus movement, because it is controlled by stage with
spatial resolution of 100 nm (normal type) or 10 nm (advanced type).
I need some time to think about how to answer your question. But confocal
Raman experiment may not be able to determine the thickness by the technique
itself on the well-known sample, because the refractive index... 阅读全帖 |
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s*i
发帖数: 5025 | 33 Yes. People are doing that. THey call that "depth from focus" and "depth from
defocus". Augmented reality guys are also doing similar thing: that is retrive
depth information from two cameras. Again, it is not accurate enough :(
irreversibly
years
LOM |
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c*s
发帖数: 2145 | 34 这两个要一致似乎很难，做电竞的时候稍微有点defocus，那就是几个纳米的误差，
dls测这么小的颗粒，本来就到下限了，还要和tem比较，晕 |
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C**R
发帖数: 1047 | 35 think about it. what is zero-order?
It is the sum of your illumination.(set kx,ky=0, you get a simple
integration)
So, no matter how u change the defocus, the sum of your illumination does
not change.
sectioned |
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g******y
发帖数: 2517 | 36 Sony Alpha NEX-3 Interchangeable Lens Digital Camera w/18-55mm Lens (Black)-
14.2 Mpix. Build as "the world's smallest, lightest interchangeable lens
digital camera," this mirrorless camera features a 3" tiltable LCD, anti-
dust function, background defocus control, 720p movie mode, HDMI port, USB
connectivity, Memory Stick Pro Duo/SD/SDHC card slots, and more. Only $380
http://amzn.to/zjyi2d |
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w*******y
发帖数: 60932 | 37 Sony Cyber-shot DSC-HX9V 16.2 MP Exmor R CMOS Digital Camera w/ 16x Optical
Zoom + Free Camera Case $259 with free shipping
price drops and free case is added when you log in to checkout at buydig:
http://www.buydig.com/shop/product.aspx?sku=SNDSCHX9V
Full HD 1080/60p with dual record of stills and movies
Sony G lens with 16x optical zoom in a compact camera body
16.2MP ?Exmor R? CMOS sensor for superior low-light performance
Backlight Correction; get details in difficult lighting
3D stills and ... 阅读全帖 |
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