基于AM437x创龙开发板的OpenCV移植教程

`AM437x部分例程使用了OpenCV库。如果在开发过程中并不使用OpenCV库，可以选择不移植OpenCV。本次开发移植使用的是创龙TL437xF-EVM开发板，基于ti AM4379 ARM Cortex-A9 CPU，主频高达1GHz

OpenCV简介

OpenCV的全称是：Open Source Computer Vision Library。OpenCV是一个基于BSD许可（开源）发行的跨平台计算机视觉库，可以运行在Linux、Windows和Mac OS操作系统上。它轻量级而且高效——由一系列C函数和少量C++类构成，同时提供了Python、Ruby、matlab等语言的接口，实现了图像处理和计算机视觉方面的很多通用算法。

解压OpenCV2.4.11

本次移植的OpenCV版本为OpenCV-2.4.11。将opencv-2.4.11.zip压缩文件拷贝到Ubuntu的”/home/tronlong/AM437x”目录下，进入文件所在路径，执行如下命令，将opencv-2.4.11.zip解压，文件会解压在当前目录。

Host# unzip opencv-2.4.11.zip

配置和编译OpenCV2.4.11

进入源码目录，新建build目录用于存放工作文件。依次执行如下命令：

Host# cd opencv-2.4.11

Host# mkdir build

Host# cd build

在build目录下，新建配置文件arm-linux-gnueabihf.cmake。

如使用V01.00.00.03版本LinuxProcessor-SDK，请写入如下内容：

# the name of the target operating system

SET(CMAKE_SYSTEM_NAME Linux)

# which C and C++ compiler to use

SET(CMAKE_C_COMPILER/home/tronlong/ti-processor-sdk-linux-am437x-evm-01.00.00.03/linux-devkit/sysroots/i686-arago-linux/usr/bin/arm-linux-gnueabihf-gcc)

SET(CMAKE_CXX_COMPILER /home/tronlong/ti-processor-sdk-linux-am437x-evm-01.00.00.03/linux-devkit/sysroots/i686-arago-linux/usr/bin/arm-linux-gnueabihf-g++)

#here is the target environment located

SET(CMAKE_FIND_ROOT_PATH /home/tronlong/ti-processor-sdk-linux-am437x-evm-01.00.00.03/linux-devkit/sysroots/cortexa9t2hf-vfp-neon-linux-gnueabi/usr/lib)

#adjust the default behaviour of the FIND_XXX() commands:

#search headers and libraries in the target environment, search

#programs in the host environment

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)

set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)

如使用V03.03.00.04版本LinuxProcessor-SDK，请写入如下内容：

# the name of the target operating system

SET(CMAKE_SYSTEM_NAME Linux)

# which C and C++ compiler to use

SET(CMAKE_C_COMPILER/home/tronlong/ti-processor-sdk-linux-am437x-evm-03.03.00.04/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc)

SET(CMAKE_CXX_COMPILER /home/tronlong/ti-processor-sdk-linux-am437x-evm-03.03.00.04/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-g++)

#here is the target environment located

SET(CMAKE_FIND_ROOT_PATH /home/tronlong/ti-processor-sdk-linux-am437x-evm-03.03.00.04/linux-devkit/sysroots/armv7ahf-neon-linux-gnueabi/usr/lib)

#adjust the default behaviour of the FIND_XXX() commands:

#search headers and libraries in the target environment, search

#programs in the host environment

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)

set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)

红色内容请修改为对应平台LinuxProcessor-SDK安装包实际的交叉编译工具链和系统库文件路径。从文档拷贝上述内容时，指令可能会出现换行现象，拷贝时请仔细核对。

执行如下命令安装编译插件：

Host# sudo apt-get install cmake

在build目录下执行如下命令进行配置并生成makefile：

Host# cmake -DWITH_OPENCL=OFF -DWITH_OPENMP=OFF-DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DCMAKE_INSTALL_PREFIX=/home/tronlong/AM437x/opencv-2.4.11-DCMAKE_TOOLCHAIN_FILE=arm-linux-gnueabihf.cmake ..