the checker board
checker board classification example
327 Matching Annotations
- Mar 2018
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pprc.qmul.ac.uk pprc.qmul.ac.uk
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pprc.qmul.ac.uk pprc.qmul.ac.uk
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Statistical Data Anlalysis
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Particle Physicist
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imperfect c++
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ece.uwaterloo.ca ece.uwaterloo.ca
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Todd Veldhuizen
Blitz++ is a class library for scientific computing designed by Todd Veldhuizen
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WHETHER C++ CAN BE FASTER THAN FORTRAN
Will C++ be faster than Fortran?
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simple analogy
a good example about the difference of memory
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www.pyimagesearch.com www.pyimagesearch.com
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Rybnikov
Object detection with deep learning and OpenCV
the main contributor to the dnn module for making deep learning so accessible from within the OpenCV library.
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distill.pub distill.pub
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distill.pub distill.pub
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www.gogeometry.com www.gogeometry.com
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Geometry from the Land of Incas
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petewarden.com petewarden.com
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Benoit Jacob
founder of Eigen project
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halide-lang.org halide-lang.orgHalide1
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accu.org accu.org
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Using C++ Trait Classes for Scientific Computing
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C++ 泛型编程中的
Traits
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heath.cs.illinois.edu heath.cs.illinois.edu
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Scientific Computing: An Introductory Survey
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github.com github.com
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Distance from a point to a line segment
Lines and Distance of point to line
point: P line_seg_start_point: P0 line_seg_end_point: P1
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www.cs.princeton.edu www.cs.princeton.edu
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Robert Sedgewick
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ogldev.atspace.co.uk ogldev.atspace.co.uk
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manao.inria.fr manao.inria.fr
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bitbucket.org bitbucket.org
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A = LL^* = U^*U
正定矩阵的标准 Cholesky 分解 $$A = LL^ = U^U$$
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Gael Guennebaud
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bitbucket.org bitbucket.org
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selfadjoint (hermitian) matrices
埃尔米特矩阵, 自伴随矩阵
$$A^H = A =\overline{A^T}$$
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www.seas.ucla.edu www.seas.ucla.edu
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ECE133A - Applied Numerical Computing
seas = School of Engineering and Applied Sciences
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www.seas.ucla.edu www.seas.ucla.educhol.pdf4
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QR factorization method is more stable
\(QR\) 分解更稳定
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every positive definite matrixAhas positive diagonal elements
正定矩阵的主对角线上的元素是正数
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gives a practical method for testing positive definiteness
Cholesky 分解给了一种判断矩阵正定的方法
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positive semidefinite, but not positive definite, then it is singular
正半定矩阵是奇异的 $$ \begin{array}{rl} f(t) =& (x-tAx)^TA(x-tAx)\ =&-2t\Vert Ax\Vert^2 + t^2x^TA^3x \end{array} $$
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eigen.tuxfamily.org eigen.tuxfamily.orgEigen1
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Eigen is standard C++98 and so should theoretically be compatible with any compliant compiler.
C++ 98 标准
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code.visualstudio.com code.visualstudio.com
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linting
语法检测功能
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www.theglobeandmail.com www.theglobeandmail.com
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But online life makes me into a different kind of reader – a cynical one
但网络生活使我成为一种不同类型的读者， 一个犬儒的人。
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All new algorithms in OpenCV are written in C++, so there are no benefits to use OpenCV 3.x in C programs.
OpenCV 3.x 的算法都是用 C++ 实现的
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github.com github.com
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Can GitHub have a code annotation function?
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github.com github.com
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if (app.metadata && app.metadata.has('dc:title') && app.metadata.get('dc:title') !== 'Untitled') { title = app.metadata.get('dc:title'); }
the empty
dc:titleshould also be considered asUntitled
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stackoverflow.com stackoverflow.com
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While that allows you to use the string class, the relevant operator<< is defined in the <string> header itself, so you must include that manually
为什么有时候使用visual c++会提示
cout <<不能输出string类型: 因为<iostream>包含了头文件<xstring>, 该头文件引入了string类型但是未引入operator<<
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msdn.microsoft.com msdn.microsoft.com
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Interprocess Synchronization
进程间同步使用同一个同步对象的多个句柄
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Local file Local file
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Priority Scheduling
优先级调度
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TheSJFalgorithm can be either preemptive or nonpreemptive.
SJF 可以是抢占的也可以是非抢占的
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exponential average
SJF 调度使用之前CPU burst度量值的 指数平均 来预测下一个 burst
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FCFSscheduling algorithm is nonpreemptive
FCFS 调度是非抢占的
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Shortest-Job-First Scheduling
SJF: 最短任务优先调度
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First-Come, First-Served Scheduling
FCFS: 先到先服务调度
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short-term scheduler
也称为CPU调度程序, 完成的功能就是从内存中选择一个 ready 状态的进程开始执行, 并将CPU分配给该进程.
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special hardware (for example, a timer) needed for preemptivescheduling.
抢占式调度通常需要一个特殊硬件, 如: 定时器
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Operating System Concepts
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Scheduling of this kind is a fundamental operating-system function.Almost all computer resources are scheduled before use
调度是操作系统的基本功能, 几乎所有的计算机资源在使用前均先调度
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Local file Local file
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PCB
Process Control Blocks
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Arrival Time (AT), Total CPU Time (TC), CPU Burst (CB) and IO Burst (IO)
进程对象仿真参数
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first line defines the count of random numbers in the file
randfile: 第一行定义文件中随机数的个数 -
One trick to deal with schedulers is to treat nonpreemptive scheduler as preemptive with very large quantum (10K is good for our simulation) that will never fire. This way the TRANS_TO_RUN transition is implemented generically.
将非抢占调度器当成抢占调度器处理
quantum 是什么
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Some hints on structuring your program
编程建议
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FCFS, LCFS, SJF, RR (RoundRobin), and PRIO (PriorityScheduler).
五个调度算法
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Operating Systems CSCI-GA.2250-001 at NYU
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gavwood.com gavwood.com
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Gavin Wood
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www.gnu.org www.gnu.org
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An option character in this string can be followed by a colon (‘:’) to indicate that it takes a required argument
option character 后跟
:表示该 option 带参数
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...
...is used to denote a possibly empty listfrom the MiniJava type system
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control-flow graph
CFG 控制流图
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method body
method body 类型定义为: 语句序列 + return 语句
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web.cs.ucla.edu web.cs.ucla.edu
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compiler structure; lexical and syntactic analysis; semantic analysis and code generation; theory of parsing
编译器需要学习的主题:
- 编译器结构
- 词法与语法分析
- 语义分析与代码生成
- parsing theory
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tiarkrompf.github.io tiarkrompf.github.io
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CS352: Compilers: princeples and practive
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compilers.cs.ucla.edu compilers.cs.ucla.edu
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parser generator
JavaCC: parser generator
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syntax tree builder
JTB: syntax tree builder
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Visitor design pattern
访问者设计模式
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github.com github.com
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Variable liveness analysis based on control flow graph
学习一下如果利用 liveness analysis 进行内存优化
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compilers.cs.ucla.edu compilers.cs.ucla.edu
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syntax tree
what's a syntax tree?
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www.zhihu.com www.zhihu.com
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程序分析
program analysis
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先放个图直观感受一下什么是flow-sensitive
图片来源: page 12. Lec02-Dataflow of cs252 of harvard university
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web-static-aws.seas.harvard.edu web-static-aws.seas.harvard.edu
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CS 252r: Advanced Topics in Programming Languages by Stephen Chong
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www.cs.put.poznan.pl www.cs.put.poznan.pl
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Static Code Analysis
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www.cambridge.org www.cambridge.org
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the MiniJava project
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Backus-Naur Form (BNF) notation
name ::= expansion
<>::=terminal|
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developer.mozilla.org developer.mozilla.org
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width The intrinsic width of the image in pixels. In HTML 4, either a percentage or pixels were acceptable values. In HTML5, however, only pixels are acceptable.
HTML5only accept pixels values ofwidth
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daringfireball.net daringfireball.net
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As of this writing, Markdown has no syntax for specifying the dimensions of an image; if this is important to you, you can simply use regular HTML <img> tags.
markdown 目前的语法不支持设置图片大小, 但可以通过一般的HTML
标签实现
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sourceware.org sourceware.org
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disable [breakpoints]
禁用断点
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Local file Local file
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sourceware.org sourceware.org
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-d|--disassemble
反汇编
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sourceware.org sourceware.org
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Address locations indicate a specific program address. They have the generalized form *address.
gdb 在某个地址下断点: b \addr*
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www.cambridge.org www.cambridge.org
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Modern Compiler Implementation in Java
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web.cs.ucla.edu web.cs.ucla.edu
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I learned a lot of high-quality material efficiently, I got many new friends, and I increased my confidence in myself. Additionally, I learned about how to do high-quality teaching from attending lectures with excellent professors, I increased my respect for several professions, and I practiced leadership skills in some of the study groups.
学习的乐趣
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计算机科学家学习MBA
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web.cs.ucla.edu web.cs.ucla.edu
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The Java Tree Builder
JTB: JavaCC 的前端
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CS 232 Static Program Analysis
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Jens Palsberg, UCLA
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web.cs.ucla.edu web.cs.ucla.edu
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Reading List for UCLA CS 232 Static Program Analysis
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We are switching to the following text book Author: Abraham Silberschatz, Peter Baer Galvin, Greg Gagne Title: Operating System Concepts
教材换了, 原来的是 Modern Operating Systems
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awards.acm.org awards.acm.org
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Yu Zheng
郑宇
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Hubertus Franke
Operating Systems CSCI-GA.2250-001 at NYU
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Shuicheng Yan
颜水成
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ACM distinguished members
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os161.eecs.harvard.edu os161.eecs.harvard.eduOS/1611
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哈佛大学操作系统课程
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Local file Local file
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Szeliski and Shum, 1997
Creating full view panoramic image mosaics and environment maps, In Proceedings of SIGGRAPH'97, volume 31, pages 251-258 .
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Homography from a pure rotation
只来自旋转的单应性
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An Invitation to 3-D Vision From Images to Geometric Models, 2004
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H.C. Longuet-Higgins
CVPR Longuet-Huggins prize
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link.springer.com link.springer.com
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A Richer Picture of Mathematics The Göttingen Tradition and Beyond, 2018
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www.cad.zju.edu.cn www.cad.zju.edu.cnPanorama2
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适用条件
拼接的适用条件
- 相机纯旋转
- 平面性场景
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增大视域
视域的比较
- 相机 FOV = 50x35°
- 人眼 FOV = 200x135°
- 全景 FOV = 360x180°
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Local file Local file
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(θ,h)
柱面坐标为 \((\theta, h)\)
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Fig. 2.6
柱面投影
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Richard Szeliski, Image Alignment and Stitching: A Tutorial, 2006
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www.gnu.org www.gnu.org
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In a let expression, the initial values are computed before any of the variables become bound.
let binding 先在当前环境中计算所有 init 表达式的值, 再 bind varible, 最后在扩展的环境中计算 expression
let* 按顺序依次计算 init 并进行 binding
letrec 则先 binding 后再计算 init 允许递归定义
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www.gnu.org www.gnu.org
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Scheme pairs is the “dotted” notation (c1 . c2)
Scheme 中 pair 的记号
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www.gnu.org www.gnu.org
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statically scoped language
scheme 是静态作用域编程语言
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mozart.github.io mozart.github.io
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Oz
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mclab.eic.hust.edu.cn mclab.eic.hust.edu.cn
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白翔, 华中科技大学
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blogs.nature.com blogs.nature.com
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In practice the tool is akin to the annotation systems on sites like medium.com and ReadCube
Hypothesis 类似于(akin to) ReadCube 和 medium 网站上的标注系统
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eLife replaces commenting system with Hypothesis annotations
eLife 采用Hypothesis替代原来的评论系统
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link-springer-com.ezproxy3.library.arizona.edu link-springer-com.ezproxy3.library.arizona.edu
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Figure 2.1.
中心投影 (central projection)
从中心点 \(C\) 将平面 \(\Psi\) 投影到平面 \(\Pi\) 上
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the symbol "v" will be used for a generated line or plane;
两点相连成直线的记号 \(P\vee Q\)
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The symbol "^" will be used to denote intersection
两条直线相交的记号 \(a\wedge b\)
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the "Princeps Mathematicae", F. Gauss (1777-1855)
数学王子 高斯
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A more concise mathematical investigation on projective geometry was started by G. Desargues (1593-1662). It was he who has introduced the notion of a point and a line at infinity.
Desargues 笛沙格引入了无穷远点和无穷远线
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The Use of Projective Geometry in Computer Graphics
Chapter 2: 射影几何的一般性介绍
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www.cad.zju.edu.cn www.cad.zju.edu.cn计算摄影学1
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浙大计算摄像学课程
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faculty.cs.tamu.edu faculty.cs.tamu.edu
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计算机图形学 (TAMU) by 柴金祥
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tiddlymap.org tiddlymap.org
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wikis and concept maps
TiddlyMap = wikis + concept maps
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www.cad.zju.edu.cn www.cad.zju.edu.cn
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两幅柱面图像的一个平移变换
柱面变换后的图像之间相差只有一个平移变换
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平面场景和相机旋转拍摄时, 两张图片间存在一个 Homography
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faculty.cs.tamu.edu faculty.cs.tamu.edu
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柴金祥 (MSRA第一篇siggraph的第一作者 现在在TAMU)
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