编译OpenCV示例convert_cascade.cpp（OpenCV 2.3）

Question

我在 Ubuntu 11.10 上运行 OpenCV 2.3.1。我可以毫无问题地编译我自己编写的各种程序。

然而，现在我有一个半完成的 Haar 级联，我需要将其组装到 xml-cascade 文件中。为此，我需要使用附带的示例程序convert_cascade.c。默认情况下它不是编译的，所以我需要这样做。

像这样运行 gcc 失败：

gcc -lopencv_core -lopencv_highgui -lopencv_objdetect -I/usr/local/include/opencv/ -L/usr/local/lib/ convert_cascade.c -o convert_cascade

它给了我以下错误：

/tmp/cc5UddX6.o: In function `cvRound':
convert_cascade.c:(.text+0x19): undefined reference to `lrint'
/tmp/cc5UddX6.o: In function `cvDecRefData':
convert_cascade.c:(.text+0xb3b): undefined reference to `cvFree_'
convert_cascade.c:(.text+0xbac): undefined reference to `cvFree_'
/tmp/cc5UddX6.o: In function `cvGetRow':
convert_cascade.c:(.text+0xca2): undefined reference to `cvGetRows'
/tmp/cc5UddX6.o: In function `cvGetCol':
convert_cascade.c:(.text+0xccd): undefined reference to `cvGetCols'
/tmp/cc5UddX6.o: In function `cvReleaseMatND':
convert_cascade.c:(.text+0xce0): undefined reference to `cvReleaseMat'
/tmp/cc5UddX6.o: In function `cvSubS':
convert_cascade.c:(.text+0xe00): undefined reference to `cvAddS'
/tmp/cc5UddX6.o: In function `cvCloneSeq':
convert_cascade.c:(.text+0xe4e): undefined reference to `cvSeqSlice'
/tmp/cc5UddX6.o: In function `cvSetNew':
convert_cascade.c:(.text+0xead): undefined reference to `cvSetAdd'
/tmp/cc5UddX6.o: In function `cvGetSetElem':
convert_cascade.c:(.text+0xf40): undefined reference to `cvGetSeqElem'
/tmp/cc5UddX6.o: In function `cvEllipseBox':
convert_cascade.c:(.text+0x1040): undefined reference to `cvEllipse'
/tmp/cc5UddX6.o: In function `cvFont':
convert_cascade.c:(.text+0x1090): undefined reference to `cvInitFont'
/tmp/cc5UddX6.o: In function `cvReadIntByName':
convert_cascade.c:(.text+0x111e): undefined reference to `cvGetFileNodeByName'
/tmp/cc5UddX6.o: In function `cvReadRealByName':
convert_cascade.c:(.text+0x11af): undefined reference to `cvGetFileNodeByName'
/tmp/cc5UddX6.o: In function `cvReadStringByName':
convert_cascade.c:(.text+0x1209): undefined reference to `cvGetFileNodeByName'
/tmp/cc5UddX6.o: In function `cvReadByName':
convert_cascade.c:(.text+0x1239): undefined reference to `cvGetFileNodeByName'
convert_cascade.c:(.text+0x124f): undefined reference to `cvRead'
/tmp/cc5UddX6.o: In function `main':
convert_cascade.c:(.text+0x13b6): undefined reference to `cvLoadHaarClassifierCascade'
convert_cascade.c:(.text+0x1495): undefined reference to `cvSave'
collect2: ld returned 1 exit status

似乎所有缺少的函数都是在 core_c.h 中原型化的旧 C 风格 OpenCV 函数。但包括它（ #include）没有什么区别。我还尝试使用 -lopencv_legacy 标志进行编译（基本上只是猜测它可能与旧函数有关），但无济于事。

我应该做什么才能编译它？

Answer 1

/samples/c/ 目录中应该有一个 build_all.sh 脚本，它将为您构建所有示例；无需 CMAKE 调整。

Answer 2

没关系。结果我必须重新编译 OpenCV 才能启用 TBB，所以我只是给 CMAKE 提供了 BUILD_EXAMPLES=ON 命令，现在我有了编译版本。我很确定这不是正确的解决方案;-)