在 64 位 Mac 上编译 OpenCV 代码

Question

我最近继承了一些OpenCV代码。我在我的 mac 上安装了 openCV，内置在 XCode 中，然后编译并成功运行了我的第一个 openCV“hello world”程序。

现在，我尝试运行给定的代码，但出现错误，这让我相信这是在 32 位 Windows 系统上运行的原始代码和在 64 位 Mac 上运行的原始代码的问题。

当我通过输入“make”运行 Makefile 时，

CC = g++
CFLAGS =
LDFLAGS = -I/usr/local/include/opencv -lm -lopencv_core -lopencv_highgui -lopencv_video
ALL = vision

all: $(ALL)

vision: vision.o
    $(CC) $(LDFLAGS) -o $@ $^

vision.o: vision.cpp
    $(CC) $(LDFLAGS) -c $<

.PHONY: clean

clean:
    rm -rf *.o core* $(ALL)

我得到以下输出……

g++ -I/usr/local/include/opencv -lm -lopencv_core -lopencv_highgui -lopencv_video -o vision vision.o
Undefined symbols for architecture x86_64:
  "cv::equalizeHist(cv::Mat const&, cv::Mat&)", referenced from:
      _main in vision.o
  "cv::threshold(cv::Mat const&, cv::Mat&, double, double, int)", referenced from:
      _main in vision.o

ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [vision] Error 1

我很困惑；这是否意味着我安装的 OpenCV 是错误的，代码（特别是那些方法）需要更改，或者完全是其他什么？

注意：当我从 Vision.cpp 代码中注释掉问题方法时，一切都可以正常编译。

Answer 1

将 opencv_imgproc 添加到您的 LDFLAGS：

LDFLAGS = -I/usr/local/include/opencv -lm -lopencv_core -lopencv_highgui -lopencv_video -lopencv_imgproc

Answer 2

这是一个工作示例：

CXX = g++

SOURCES = aaa.cpp bbb.cpp
OBJS = $(SOURCES:.cpp=.o)

CXXFLAGS = -I. -I/opt/local/include \
            -std=c++11 -stdlib=libc++ \
            -g3 -Wall -O0
            # -std=c++0x -arch x86_64 -stdlib=libc++ \

LDFLAGS = -L/opt/local/lib -L/usr/lib $(pkg-config --libs --cflags opencv) -lm -ljpeg
LDFLAGS = -L/opt/local/lib -L/usr/lib -I/opt/local/include/opencv -I/opt/local/include -L/opt/local/lib -lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_gpu -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_nonfree -lopencv_objdetect -lopencv_photo -lopencv_stitching -lopencv_superres -lopencv_ts -lopencv_video -lopencv_videostab -lm -ljpeg

.o:
    $(CXX) $(CXXFLAGS) -o $@ -c $^

all: $(OBJS)
    $(CXX) $(CXXFLAGS) $(LDFLAGS) -o out $(OBJS)

clean:
    rm -rf *.o

Answer 3

您还可以让计算机自动猜测您的库：

CFLAGS = `pkg-config --cflags opencv` 
LDFLAGS = `pkg-config --libs opencv` -lm