Opencv 自定义编译

Question

我正在尝试减少 ios 的 opencv2.framework 大小。我的项目只使用 core、imgproc 和 highgui 模块。如何仅使用这些模块进行编译？还是有减小尺寸的替代方法？

谢谢。

Answer 1

我现在在 3.1 版本中遇到了这个问题，nebuto 的答案很接近，但目前还不完整。通过更新 build_framework.py 文件，以下能够产生所需的结果。

def getCMakeArgs(self, arch, target):
    args = [
        "cmake",
        "-GXcode",
        "-DBUILD_SHARED_LIBS=OFF",
        "-DBUILD_opencv_core=ON",
        "-DBUILD_opencv_imgcodecs=OFF",
        "-DBUILD_opencv_imgproc=ON",
        "-DBUILD_opencv_world=OFF",
        "-DBUILD_opencv_gpu=OFF",
        "-DBUILD_opencv_calib3d=OFF",
        "-DBUILD_opencv_contrib=OFF",
        "-DBUILD_opencv_features2D=OFF",
        "-DBUILD_opencv_flann=OFF",
        "-DBUILD_opencv_highgui=ON",
        "-DBUILD_opencv_legacy=OFF",
        "-DBUILD_opencv_ml=OFF",
        "-DBUILD_opencv_nonfree=OFF",
        "-DBUILD_opencv_objdetect=OFF",
        "-DBUILD_opencv_photo=OFF",
        "-DBUILD_opencv_stitching=OFF",
        "-DBUILD_opencv_video=OFF",
        "-DBUILD_opencv_videoio=OFF",
        "-DBUILD_opencv_videostab=OFF",
        "-DAPPLE_FRAMEWORK=ON",
        "-DCMAKE_INSTALL_PREFIX=install",
        "-DCMAKE_BUILD_TYPE=Release",
    ]
    return args

此更新还包括两个在 2.4.6 中似乎不存在的新模块。

为了节省一些额外费用，您可以删除位于文件底部的模拟器构建的 i386 设置。如果您的应用是 iOS 9 及更高版本，并且您希望省略 32 位设备，您也可以去掉 armv7 选项。

b = Builder(args.opencv, args.contrib,
    [
        ("armv7", "iPhoneOS"),
        ("armv7s", "iPhoneOS"),
        ("arm64", "iPhoneOS"),
        #("i386", "iPhoneSimulator"),
        ("x86_64", "iPhoneSimulator"),
    ])
b.build(args.out)

Answer 2

从 v2.4.6 开始，OpenCV 有一个自定义 python 脚本来简化工作 (平台 > ios > build_framework.py)

您只需要在 cmake 行添加标志即可进行自定义编译。

例如：我只需要 lib imgproc 并将所有标头包含到存档中，我的 cmake 现在类似于：

cmakeargs = ("-GXcode " +
            "-D BUILD_SHARED_LIBS=OFF "+
            "-D BUILD_opencv_core=ON "+
            "-D BUILD_opencv_imgproc=ON "+
            "-D BUILD_opencv_world=ON "+
            "-D BUILD_opencv_gpu=OFF "+
            "-D BUILD_opencv_calib3d=OFF "+
            "-D BUILD_opencv_contrib=OFF "+
            "-D BUILD_opencv_features2D=OFF "+
            "-D BUILD_opencv_flann=OFF "+
            "-D BUILD_opencv_highgui=OFF "+
            "-D BUILD_opencv_legacy=OFF "+
            "-D BUILD_opencv_ml=OFF "+
            "-D BUILD_opencv_nonfree=OFF "+
            "-D BUILD_opencv_objdetect=OFF "+
            "-D BUILD_opencv_photo=OFF "+
            "-D BUILD_opencv_stitching=OFF "+
            "-D BUILD_opencv_video=OFF "+
            "-D BUILD_opencv_videostab=OFF "+
            "-DCMAKE_BUILD_TYPE=Release " +
            "-DCMAKE_TOOLCHAIN_FILE=%s/platforms/ios/cmake/Toolchains/Toolchain-%s_Xcode.cmake " +
            "-DCMAKE_INSTALL_PREFIX=install") % (srcroot, target)

不要忘记添加核心和世界库，因为它们是强制性的。 执行python脚本>profite。

之后手动将库添加到您的项目中，并删除头文件中留下的讨厌的导入头文件 > opencv.hpp，您应该一切顺利！

Answer 3

只需从模块文件夹中删除模块并从头文件中删除包含行。然后编译。在这样做之前，请阅读 CMakeLists.txt 以了解依赖项。

例如，对于highgui模块；

ocv_define_module(imgproc opencv_core)

Answer 4

从 opencv 3.4.1 开始，您现在可以使用 BUILD_LIST 参数来指定要构建的模块。这是一种白名单方法与使用上述-BUILD_opencv_xxx=OFF 方法的黑名单方法。

如果您想要的只是 imgproc 模块，那么您可以将构建脚本修改为如下内容：

def getCMakeArgs(self, arch, target):
    args = [
        "cmake",
        "-GXcode",
        "-DBUILD_LIST=imgproc"
        "-DAPPLE_FRAMEWORK=ON",
        "-DCMAKE_INSTALL_PREFIX=install",
        "-DCMAKE_BUILD_TYPE=Release",
    ]
    return args

虽然在实践中，这对我来说并不奏效。我还必须手动排除 highgui、imgcodecs 和 videoio：

def getCMakeArgs(self, arch, target):
    args = [
        "cmake",
        "-GXcode",
        "-DBUILD_LIST=imgproc"
        "-DBUILD_opencv_highgui=OFF",
        "-DBUILD_opencv_imgcodecs=OFF",
        "-DBUILD_opencv_videoio=OFF",
        "-DAPPLE_FRAMEWORK=ON",
        "-DCMAKE_INSTALL_PREFIX=install",
        "-DCMAKE_BUILD_TYPE=Release",
    ]
    return args