三维重建笔记——Linux环境下openMVG的安装

参考：
openMVG Wiki
openMVG Docs

linux系统版本：Ubuntu 18.04.6 LTS

Required tools：CMake ，git ， C/C++ compiler like Visual Studio or GCC

1.openMVG下载、编译、安装

参考：openMVG BUILD.md

安装依赖

sudo apt-get install libpng-dev libjpeg-dev libtiff-dev libxxf86vm1 libxxf86vm-dev libxi-dev libxrandr-dev graphviz

下载源码

网络好的话可以直接从Github下载openMVG源码：

git clone --recursive https://github.com/openMVG/openMVG.git

或者可以从Gitee国内的镜像源下载openMVG源码：

git clone --recursive https://gitee.com/mirrors/openMVG.git

我每次从Github上克隆的都不全，所以最后在Gitee上克隆成功了。

配置并编译
这个过程时间比较久，耐心等待…(可能是我的电脑太弱了)

cd ./openMVG
mkdir openMVG_Build && cd openMVG_Build
cmake -DCMAKE_BUILD_TYPE=RELEASE ../src/
cmake --build . --target install

Run tests using make or ctest

make test
ctest --output-on-failure -j

2.测试

下载测试数据集

下载地址：ImageDataset_SceauxCastle

下载后放入Sfm文件夹下：

查看tutorial_demo.py的源码可以看出，其实demo中可以自动下载该数据集，我的网络不行，每次运行到这就失败了，所以提前下载好了。

# usage : python tutorial_demo.py
#......
input_eval_dir = os.path.abspath("./ImageDataset_SceauxCastle")
# Checkout an OpenMVG image dataset with Git
if not os.path.exists(input_eval_dir):pImageDataCheckout = subprocess.Popen([ "git", "clone", "https://github.com/openMVG/ImageDataset_SceauxCastle.git" ])pImageDataCheckout.wait()#......

运行Python脚本tutorial_demo.py

在终端中转到 ../openMVG/openMVG_Build/software/Sfm/ 文件夹下

python tutorial_demo.py

tutorial_demo.py是将增量式三维重建和全局三维重建放在一起了运行了，openMVG也提供了单独的python脚本：

运行完毕之后会在Sfm文件夹下生成tutorial_out文件夹。

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里面存放就是特征匹配、全局三维重建、增量三维重建的输出数据、点云图和评估数据等。

查看点云图

在终端中转到 ../openMVG/openMVG_Build/software/Sfm/tutorial_out/reconstruction_global 文件夹下,使用meshlab打开点云图：

meshlab cloud_and_poses.ply

我是初学者，就是记录一下自己的学习过程，有需要的朋友可以借鉴，同时也欢迎大家批评指正！

参考文章：
1.Ubuntu下openMVG+openMVS实现三维重建
2.使用 OpenMVG+PMVS实现视觉三维重建