opencv-3.4.2 安装 （ubuntu 18.04）
问题1：
E: Unable to locate package libjasper-dev
解决方法：
https://blog.csdn.net/weixin_41053564/article/details/81254410
sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu xenial-security main"
sudo apt update
sudo apt install libjasper1 libjasper-dev
成功的解决了问题，其中libjasper1是libjasper-dev的依赖包
问题2：
No package 'gstreamer-base-1.0' found
解决方法：
https://stackoverflow.com/questions/37678324/compiling-opencv-with-gstreamer-cmake-not-finding-gstreamer
sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
问题3：
No package 'libavresample' found
解决方法：
sudo apt-get install libavresample-dev
问题4：
No package 'libgphoto2' found
解决方法：
sudo apt-get install libgphoto2-dev
问题5：
IPPICV: Download failed: 7;"Couldn't connect to server"
解决方法：
问题6：
Could not find OpenBLAS include. Turning OpenBLAS_FOUND off
-- Could not find OpenBLAS lib. Turning OpenBLAS_FOUND off
-- Could NOT find Atlas (missing: Atlas_CBLAS_INCLUDE_DIR Atlas_CLAPACK_INCLUDE_DIR Atlas_CBLAS_LIBRARY Atlas_BLAS_LIBRARY Atlas_LAPACK_LIBRARY)
-- A library with BLAS API not found. Please specify library location.
-- LAPACK requires BLAS
-- A library with LAPACK API not found. Please specify library location.
-- Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
-- Could NOT find Matlab (missing: MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN)
-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
CMake Error at cmake/OpenCVModule.cmake:288 (message):
No modules has been found:
/home/program/opencv-3.4.2/opencv_contrib-3.4.0/modules
Call Stack (most recent call first):
cmake/OpenCVModule.cmake:368 (_glob_locations)
modules/CMakeLists.txt:7 (ocv_glob_modules)
解决方法：
sudo apt-get install libopenblas-dev
问题7：
fatal error: linux/videodev.h: No such file or directory
fatal error: sys/videoio.h: No such file or directory
解决方法：
sudo ln -s /usr/include/libv4l1-videodev.h /usr/include/linux/videodev.
sudo cp /usr/include/opencv2/videoio/videoio_c.h /usr/include/x86_64-linux-gnu/sys
sudo ln -s /usr/include/x86_64-linux-gnu/sys/videoio_c.h /usr/include/x86_64-linux-gnu/sys/videoio.h
/usr/include/目录下创建sys目录，然后touch文件 videoio.h
如果仍然没有成功，那么找到含有"videodev.h"和"videoio.h"头文件的源文件，
将#include <> 改为#include ""