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:
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#/etc/ld.so.conf.d/opencv.conf
/usr/local/lib
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#/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}

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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