DFT FormulaN is the size of the sequence. Fundamental Components W = e^[-j*(2pi/N)], W^(-nk) is K subharmonic component.The relation between Euler Formula and Trigonometric Function is:e^(it) = cos(t)+i·sin(t)e^(-it) = cos(t)-i·sin(t) DFT CodeI deleted my DFT code unconsciously. The code below is d ...

FormulaH(i,j) = (1 / 2pi sigma^2) e^{[(i-k-1)^2 + (j-k-1)^2] / (2*sigma^2)}The size of the filter is 2k+1 and (i, j) represents a position in the coordinate. The origin of coordinate is the central position of the filter. Pi is circumference ratio and sigma is standard deviation. Code1234567891011 ...

To implement Spectral Residual Approach， I need to transform the images from RGB space into Gray space. RGB To Gray1Gray = R*0.299 + G*0.587 + B*0.114 RGB To LabTo implement Frequency Tuned Approach， I need to transform the images from RGB space into Lab space.123456789101112131415161718192021222324 ...

First Step1sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak Second Step1sudo vim /etc/apt/sources.list Add these sources to the tail of the file:12345678910111213141516171819deb http://mirrors.ustc.edu.cn/ubuntu/ precise-updates main restricteddeb-src http://mirrors.ustc.edu.cn/ubuntu/ precis ...

Today, I want to try a new DB-postgresql and prepare to install it on my server.There some problems stand in the way during I install postgresql. resourceAt the begining, I tried to find some commands to download and install postgresql.Unfortunately, the resource were not found.Then I started to fin ...

InterviewLast semester, during a holy Party conference, my classmeet Liu talked with me about her internship company.Out of curiousity, I asked her how can I get an offer from a company.She told me about her experience detailedly.Then I forget it.After two or three weeks, Liu texted me a message and ...

最近一段时间经常有人问我保研去了哪里，我一直都在含糊其辞，也说了一些谎话（如在考虑包内还是保外；保外只是报名了，最终结果还不知道）。对于大家的关心我先表示衷心的感谢，然后我想对我说过的这些谎话表示一下抱歉，我这么说首先是因为本人喜欢低调，不喜欢成为别人嘴里日常的话题，其实我也一直很低调，但还是经常能听到关于我的故事（暂且称之为故事吧，我也想不到更好的词了），比如前段时间人人都说我机试做出来了，我只能表示我的结果其实有错，并没有全对，但是无论我怎么解释大家传的都是我做出来了，程序速度很快，我只能表示这样的话我从来没有说过……其次，我确实没有百分百确定我以后去哪个学校，虽然当时百分之九十九的可能是 ...

In contemporary society, big data is one of the hottest topics all over the world.I recommend a book named Big Data, writen by Viktor Mayer-Schonberger and Kenneth Cukier, that I have read several months ago.As the authors reference in the book, big data is a revolution that will transform how we li ...