Lectures

https://arxiv.org/pdf/1803.04189.pdf

OpenCV 2.4.9 and 3.4.1 Compiling

2.4.x

CUDA_nppi_LIBRARY  CUDA 7.5 -> 8.0 (was removed)
  -D WITH_CUDA=OFF ..

c++ 6 fatal error: stdlib.h: No such file or directory

 export CC=path_of_gcc/gcc-version
 export CXX=path_of_g++/g++-version
 cmake  path_of_project_contain_CMakeList.txt
 make 

OR

 #Current version is 6, but we need to compile using another version (installed for sure)

$CC="gcc-4.9" CXX="g++-4.9" cmake /CMakeLists.txt 

OR$cmake -G "Unix Makefiles" -DCMAKE_CXX_COMPILER=/usr/bin/g++ CMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local -DWITH_TBB=ON -DBUILD_NEW_PYTHON_SUPPORT=ON -DWITH_V4L=ON -DINSTALL_C_EXAMPLES=ON -DINSTALL_PYTHON_EXAMPLES=ON -DBUILD_EXAMPLES=ON -DWITH_QT=ON -DWITH_OPENGL=ON -DBUILD_FAT_JAVA_LIB=ON -DINSTALL_TO_MANGLED_PATHS=ON -DINSTALL_CREATE_DISTRIB=ON -DINSTALL_TESTS=ON -DENABLE_FAST_MATH=ON -DWITH_IMAGEIO=ON -DBUILD_SHARED_LIBS=OFF -DWITH_GSTREAMER=ON -DWITH_OPENMP=OFF -DWITH_CUDA=OFF -DBUILD_opencv_gpu=OFF ..

3.4.x

Unknown CMake command "ocv_append_source_files_cxx_compiler_options".

This happened when the opencv_contrib version is no compatible with your current version.

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ ..


$make
$sudo make install
$sudo ldconfig

After installation, if doesn't compile, check the files opencv.conf and opencv.pc:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#/etc/ld.so.conf.d/opencv.conf
/usr/local/lib
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#/usr/local/lib/pkgconfig/opencv.pc

prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include

Name: OpenCV
Description: Open Source Computer Vision Library
Version: 2.4.13.6
Libs: -L${exec_prefix}/lib -lopencv_contrib -lopencv_legacy -lopencv_stitching -lopencv_nonfree -lopencv_superres -lopencv_ocl -lopencv_objdetect -lopencv_ml -lopencv_ts -lopencv_videostab -lopencv_video -lopencv_photo -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_imgproc -lopencv_flann -lopencv_core -L/usr/lib/x86_64-linux-gnu -lIlmThread -lHalf -lIex -lIlmImf -lImath -ljasper -ltiff -lpng -ljpeg -lavutil -lswscale -lswresample -lavcodec -lz -llzma -lxcb-shape -lxcb-render -lxcb-xfixes -lxcb-shm -lxcb -lavformat -lv4l2 -lv4l1 -ldc1394 -lGL -lGLU -latomic -ltbb -lrt -lpthread -lm -ldl -lstdc++
Cflags: -I${includedir_old} -I${includedir_new}

 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


Resources:

[1] opencv github (choice right branch) https://github.com/opencv/opencv

[1] opencv_contrib is just from 3.0 .. https://github.com/opencv/opencv_contrib/releases
[2] Steps for install () http://karytech.blogspot.com/2012/05/opencv-24-on-ubuntu-1204.html
[3] Script for install under ubuntu16 https://gist.github.com/fortunto2/20a9696c7fc23ef18f8cfc50e371fe5f
[4] Some variables http://daveaubin.com/index.php/how-to-build-and-install-opencv-2-4-9-on-raspberry-pi/

Signal Processing - Sound Processing

 Resources:
[1] Course and Tutorial https://github.com/AllenDowney/ThinkDSP

Fluid Simulation: Lectures and Resources

CAELinux LiveDVD in your computer to turn it into a free and open engineering development workstation with CAD, CAM, CAE / FEA / CFD, electronic design and 3D printing  features: no licence and even no installation is required ! [2]


Resources:
[1] Laboratory http://lgg.epfl.ch/research_physicsbased_animation.php
[2] CFD Linux distro https://caelinux.com/CMS3/

Courses:
[1] Khan https://pt.khanacademy.org/partner-content/pixar/effects/particle/p/water-simulation

Compiling tris2indicator on Linux Ubuntu 16

change code from MapViewOfFile (Windows) to mmap (Linux) on read_obj.cpp and write_grid.cpp.

$g++ read_obj.cpp vect.cpp global.cpp insert_poly.cpp write_grid.cpp timer.cpp main.cpp -lpthread -lm -o tris2indicator



source code:
[1] http://josiahmanson.com/research/wavelet_rasterization/

Mapping files into memory

• CreateFile(); or OpenFile();
• CreateFileMapping();
• MapViewOfFile();
  

mmap() combines the functions of CreateFileMapping() and MapViewOfFile()

References
[1] https://stackoverflow.com/questions/8391094/equivalent-win-api-in-nix
[2] http://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html
[3] mmap example https://gist.github.com/marcetcheverry/991042

AI Courses and Resources

Resources:

 [1] Berkeley course http://ai.berkeley.edu
 [2] Minimax algorithm https://www.geeksforgeeks.org/minimax-algorithm-in-game-theory-set-3-tic-tac-toe-ai-finding-optimal-move/
 [3] Alfa Beta Prunning https://www.geeksforgeeks.org/minimax-algorithm-in-game-theory-set-4-alpha-beta-pruning/

 [4] Full Course, Search slides https://courses.cs.washington.edu/courses/cse473/14au/slides/

Qt Project to MakeFile

qmake -spec macx-g++ x.pro on Mac OS X to generate Makefile
qmake x.pro on linux to generate Makefile (default behaviour)
qmake -spec win32-g++ x.pro on Windows to generate Makefile

References:
[1] https://stackoverflow.com/questions/8571687/how-to-get-a-makefile-from-qmake

Fluid SImulaton Source codes

Compile OceanSurface under Ubuntu 16 [2]
* Install dependences
libglm-dev
libglfw3-dev
libsoil-dev

$g++ -o OceanSurface main.cpp wave.cpp Record.cpp -lGL -lglfw -lGLEW -lfftw3 -lfftw3f -lSOIL


Resources:
[1] splishsplash http://melhorum.blogspot.com.br/2018/05/compile-splishsplash.html
[2] https://github.com/JiashuoLi/OceanSurface
[3] https://ttnghia.github.io/

Ubuntu 16 Setting Screen Samsung SyncMaster T240M

$cvt 1600 1000 #get right values for this resolution
$gtf 1600 1000 60 #alternative


# 1600x1000 59.87 Hz (CVT 1.60MA) hsync: 62.15 kHz; pclk: 132.25 MHz
Modeline "1600x1000_60.00" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync
 
$ sudo xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync  #define

$ sudo xrandr --addmode DVI-I-1 "1600x1000" #register on system

$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 16384 x 16384
DVI-I-1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95 +
1600x1200 60.00
1280x1024 75.02 60.02
1280x960 60.00
1152x864 75.00
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08
1600x900 59.95*
1600x1000 59.87
DVI-I-2 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
1600x900_60.00 (0x58e) 118.250MHz -HSync +VSync
h: width 1600 start 1696 end 1856 total 2112 skew 0 clock 55.99KHz
v: height 900 start 903 end 908 total 934 clock 59.95Hz

* Set permanent settings using ~/.xprofile (for example)
$vi ~/.xprofile
#
xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync 
xrandr --addmode DVI-I-1 "1600x1000"


* Problem: After nvidia drivers installation this doesn't works (crap)



$xrandr --fb 1600x1000 #show
xrandr: specified screen 1900x1000 not large enough for output DVI-I-3 (1920x1200+0+0)
xrandr: Configure crtc 0 failed
X Error of failed request:  BadValue (integer parameter out of range for operation)
#or
X Error of failed request:  BadMatch (invalid parameter attributes)

$xrandr --output DVI-I-3 --scale 1x0.85  #this solve  after nvidia drivers installation



References:
http://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop/

ARM Virtual Machine resources

[1] https://www.red-lang.org/2012/03/setting-up-arm-virtual-machine.html

Nvidia and Opengl doesn't works

libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast

Prepare removing

• sudo apt-get purge nvidia* #This will remove your current nVidia drivers
• sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
• sudo dpkg-reconfigure xserver-xorg #This should fix Xorg
• sudo update-alternatives --remove gl_conf /usr/lib/nvidia-current/ld.so.conf

After this reïnstall nVidia software

• sudo apt-add-repository ppa:xorg-edgers/ppa #provides the necessary repository
• sudo apt-get update
• sudo apt-get install bumblebee-nvidia nvidia-319 nvidia-settings-319

voip by web

[1] 12voip https://www.12voip.com

My favorite Music

Ludwig Van Beethoven
   Symphony No. 5 in C minor ("Fate") (composed 1804–08, premièred 1808)
   Sonata N° 14 'moonlight'
   Fur Elisa
   Himno de la alegria
   Turkish March  (Adapted by Chavo del 8 program, in intro)


Wolfgang Amadeus Mozart
  Turkish March
  Réquiem

Antonio Vivaldi
  Storm
  La Stravaganza  Four Season:Spring

Johan Sebastian Bach
 Toccata and Fugue Ave maria
  Passacaglia
Frédéric Chopin
  Waltz rain
  Spring waltz (Mariage d'Amour)

Antonín Dvořák
  Symphony no. 9 - 4th movement - Allegro con fuoco

C++ equivalent to getch() and getche() from conio.h

#include <iostream>
#include <termios.h> //TCSANOW, ICANON, ..
#include <unistd.h>  //STDIN_FILENO ..
#include <stdio.h>  //getchar

using namespace std;

char getch(void)
{
  struct termios oldattr, newattr;
  char ch;
  tcgetattr( STDIN_FILENO, &oldattr );
  newattr = oldattr;
  newattr.c_lflag &= ~( ICANON | ECHO );
  tcsetattr( STDIN_FILENO, TCSANOW, &newattr );
  ch = getchar();
  tcsetattr( STDIN_FILENO, TCSANOW, &oldattr );
  return ch;
}

char getche(void) //with ECHO
{
  struct termios oldattr, newattr;
  int ch;
  tcgetattr( STDIN_FILENO, &oldattr );
  newattr = oldattr;
  newattr.c_lflag &= ~( ICANON );
  tcsetattr( STDIN_FILENO, TCSANOW, &newattr );
  ch = getchar();
  tcsetattr( STDIN_FILENO, TCSANOW, &oldattr );
  return ch;
}

int main(int argc,char *argv[])
{
  char ch1=getch();
  char ch2=getche();
  cout << "\nFirst : " << ch1
       << "\nSecond: " << ch2 << endl;
  return 0;
}
//g++ getchx.cpp -o getchx

References
[1] https://www.daniweb.com/programming/software-development/threads/410155/gcc-equivalent-for-getch

Alternatives to shazam

[1] On web https://www.midomi.com
[2] Get song name from mp3 on web  http://audiotag.info
[3] Chrome plugin https://www.aha-music.com/

Deep Learning Lectures

References:
[1] Top ten papers https://www.techleer.com/articles/517-a-list-of-top-10-deep-learning-papers-the-2018-edition/

Printable Grid and Rulers Paper

Resources:
[1] Graph Paper, ready for print over A4 http://www.grassfedjp.com/print-grid-paper/
[2] Rulers http://leversetdujour.info/ruler-to-print.html

Alternatives to Google StreeView

References:

[1] https://www.mapillary.com/
[2] https://www.topbestalternatives.com/google-street-view/

Linux Microphone doesn't working

Try to reload drivers

$sudo alsa force-reload

restart device and check if sound is workin? if it doesnt do this:

$sudo apt-get remove --purge alsa-base pulseaudio
$sudo apt-get install alsa-base pulseaudio 

References:
[1] https://askubuntu.com/questions/508221/sound-input-device-microphone-not-working