在讯为i.MX6DL/QL核心板安装openCV

开发环境：

1、讯为i.MX6DL/QL核心板，D 为双核1G+8GEMMC，Q为四核2G +16GEMMC

2、操作系统：ubuntu 12.04 LTS i.MX6定制版

3、cmake 3.5.1：ubuntu 12.04 LTS自带cmake为2.8版本，openCV 3.X所需cmake最低版本为2.8.7，因此用opensource的cmake 3.5.1进行编译，如何编译cmake 不再赘述

4、编译openCV：

   4.1、关于可编译的openCV 版本，根据本人30小时惨痛尝试，各位不要再试图安装openCV 3.3 以上版本了。在x86/amd64的intel CPU 上使用ubuntu 12.04 LTS，编译openCV 3.4.1 是可以成功的，但在开发板上无法顺利编译。作者最终使用了openCV 3.1.0在开发板上编译成功

  4.2、依赖包：build-essential libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev numpy libvtk5-dev libjpeg-dev libtiff4-dev libjasper-dev libopenexr-dev libtbb-dev 其中ibvtk5-dev和libopenexr-dev非常重要，libtbb-dev可能无法下载可以忽略

  4.3、其余编译步骤网上非常多，此处不再赘述

5、关于编译openCV 3.4.1 make时出错的文本如下，请各位大侠帮忙看看是否有办法解决

[  0%] Built target gen-pkgconfig
[  9%] Built target libwebp
[ 14%] Built target IlmImf
[ 20%] Built target libprotobuf
[ 23%] Built target carotene_objs
[ 24%] Built target tegra_hal
[ 24%] Built target opencv_ts_pch_dephelp
[ 24%] Built target pch_Generate_opencv_ts
[ 25%] Built target opencv_core_pch_dephelp
[ 25%] Built target pch_Generate_opencv_core
[ 31%] Built target opencv_core
[ 31%] Built target opencv_imgproc_pch_dephelp
[ 31%] Built target pch_Generate_opencv_imgproc
[ 31%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/smooth.cpp.o
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp: In function ‘void cv::vlineSmooth1N(const FT* const*, const FT*, int, ET*, int) [with ET = unsigned char, FT = {anonymous}::ufixedpoint16]’:

/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2676:31: error: conversion from ‘{anonymous}::ufixedpoint32’ to ‘cv::uint8_t {aka unsigned char}’ is ambiguous

/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2676:31: note: candidates are:
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:223:22: note: {anonymous}::ufixedpoint32::operator float() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:222:22: note: {anonymous}::ufixedpoint32::operator double() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:221:22: note: {anonymous}::ufixedpoint32::operator ET() const [with ET = unsigned char]
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp: In function ‘void cv::vlineSmooth1N1(const FT* const*, const FT*, int, ET*, int) [with ET = unsigned char, FT = {anonymous}::ufixedpoint16]’:
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2693:24: error: conversion from ‘const {anonymous}::ufixedpoint16’ to ‘cv::uint8_t {aka unsigned char}’ is ambiguous
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2693:24: note: candidates are:
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:289:22: note: {anonymous}::ufixedpoint16::operator float() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:288:22: note: {anonymous}::ufixedpoint16::operator double() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:287:22: note: {anonymous}::ufixedpoint16::operator ET() const [with ET = unsigned char]
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp: In function ‘void cv::vlineSmooth3N(const FT* const*, const FT*, int, ET*, int) [with ET = unsigned char, FT = {anonymous}::ufixedpoint16]’:
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2740:71: error: conversion from ‘{anonymous}::ufixedpoint32’ to ‘cv::uint8_t {aka unsigned char}’ is ambiguous
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2740:71: note: candidates are:
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:223:22: note: {anonymous}::ufixedpoint32::operator float() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:222:22: note: {anonymous}::ufixedpoint32::operator double() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:221:22: note: {anonymous}::ufixedpoint32::operator ET() const [with ET = unsigned char]
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp: In function ‘void cv::vlineSmooth5N(const FT* const*, const FT*, int, ET*, int) [with ET = unsigned char, FT = {anonymous}::ufixedpoint16]’:
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2816:109: error: conversion from ‘{anonymous}::ufixedpoint32’ to ‘cv::uint8_t {aka unsigned char}’ is ambiguous
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2816:109: note: candidates are:
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:223:22: note: {anonymous}::ufixedpoint32::operator float() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:222:22: note: {anonymous}::ufixedpoint32::operator double() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:221:22: note: {anonymous}::ufixedpoint32::operator ET() const [with ET = unsigned char]
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp: In function ‘void cv::vlineSmooth(const FT* const*, const FT*, int, ET*, int) [with ET = unsigned char, FT = {anonymous}::ufixedpoint16]’:
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2919:18: error: conversion from ‘{anonymous}::ufixedpoint32’ to ‘cv::uint8_t {aka unsigned char}’ is ambiguous
/home/linaro/opencv-3.4.1/modules/imgproc/src/smooth.cpp:2914:23: note: candidates are:
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:223:22: note: {anonymous}::ufixedpoint32::operator float() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:222:22: note: {anonymous}::ufixedpoint32::operator double() const
/home/linaro/opencv-3.4.1/modules/imgproc/src/fixedpoint.inl.hpp:221:22: note: {anonymous}::ufixedpoint32::operator ET() const [with ET = unsigned char]
make[2]: *** [modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/smooth.cpp.o] Error 1
make[1]: *** [modules/imgproc/CMakeFiles/opencv_imgproc.dir/all] Error 2
make: *** [all] Error 2