使用 openCV 库时出现必需品错误

Posted 2023-02-14

【中文标题】使用 openCV 库时出现必需品错误

【英文标题】：error in necessitas while use openCV libs

【发布时间】：2012-01-15 08:49:08

【问题描述】：

我在 QT 中为 android 设备编程，需要使用 openCV 从相机捕获。我已经使用了 Qt creator 并链接了 openCV 并使用了相机，但是在 Qt for android (necessitas) 中构建程序时，显示此错误：

C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_highgui.a(cap_images.o): In function `CvCapture_Images::close()':
    cap_images.cpp:(.text._ZN16CvCapture_Images5closeEv+0x1c): undefined reference to `cvReleaseImage'
    C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_highgui.a(cap_images.o): In function `CvCapture_Images::grabFrame()':
    cap_images.cpp:(.text._ZN16CvCapture_Images9grabFrameEv+0x1e): undefined reference to `cvReleaseImage'
    C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_highgui.a(cap_ffmpeg.o): In function `CvCapture_FFMPEG_proxy::retrieveFrame(int)':
    cap_ffmpeg.cpp:(.text._ZN22CvCapture_FFMPEG_proxy13retrieveFrameEi[CvCapture_FFMPEG_proxy::retrieveFrame(int)]+0x50): undefined reference to `cvInitImageHeader'
    cap_ffmpeg.cpp:(.text._ZN22CvCapture_FFMPEG_proxy13retrieveFrameEi[CvCapture_FFMPEG_proxy::retrieveFrame(int)]+0x5a): undefined reference to `cvSetData'
    C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_highgui.a(cap_ffmpeg.o): In function `CvVideoWriter_FFMPEG_proxy::writeFrame(_IplImage const*)':
    cap_ffmpeg.cpp:(.text._ZN26CvVideoWriter_FFMPEG_proxy10writeFrameEPK9_IplImage[CvVideoWriter_FFMPEG_proxy::writeFrame(_IplImage const*)]+0x5e): undefined reference to `cv::Exception::Exception(int, std::string const&, std::string const&, std::string const&, int)'
    cap_ffmpeg.cpp:(.text._ZN26CvVideoWriter_FFMPEG_proxy10writeFrameEPK9_IplImage[CvVideoWriter_FFMPEG_proxy::writeFrame(_IplImage const*)]+0x64): undefined reference to `cv::error(cv::Exception const&)'
    cap_ffmpeg.cpp:(.text._ZN26CvVideoWriter_FFMPEG_proxy10writeFrameEPK9_IplImage[CvVideoWriter_FFMPEG_proxy::writeFrame(_IplImage const*)]+0x6a): undefined reference to `cv::Exception::~Exception()'
    cap_ffmpeg.cpp:(.text._ZN26CvVideoWriter_FFMPEG_proxy10writeFrameEPK9_IplImage[CvVideoWriter_FFMPEG_proxy::writeFrame(_IplImage const*)]+0x11c): undefined reference to `cv::Exception::~Exception()'
C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_highgui.a(grfmt_tiff.o): In function `cv::TiffEncoder::newEncoder() const':
grfmt_tiff.cpp:(.text._ZNK2cv11TiffEncoder10newEncoderEv+0x16): undefined reference to `cv::fastMalloc(unsigned int)'
C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_highgui.a(grfmt_tiff.o): In function `cv::TiffDecoder::newDecoder() const':
grfmt_tiff.cpp:(.text._ZNK2cv11TiffDecoder10newDecoderEv+0x16): undefined reference to `cv::fastMalloc(unsigned int)'
C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_highgui.a(grfmt_tiff.o): In function `cv::TiffDecoder::~TiffDecoder()':
grfmt_tiff.cpp:(.text._ZN2cv11TiffDecoderD1Ev+0x48): undefined reference to `cv::fastFree(void*)'
grfmt_tiff.cpp:(.text._ZN2cv11TiffDecoderD1Ev+0x6e): undefined reference to `cv::Mat::deallocate()'
        .
        .
        .

首先我下载最新版本的 openCV 并构建它，然后使用库。也在

项目.pro

添加以下行：

INCLUDEPATH += "C:\OpenCV2.3.1\include\opencv" 
LIBS +="C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_androidcamera.a" \
"C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_calib3d.a" \
"C:/OpenCV2.3.1/libs/armeabi-v7a/libopencv_calib3d_pch_dephelp.a" \ .
...

necessitas 可以支持 openCV 吗？为什么显示这个错误？

对不起我的英语。

【问题讨论】：

How to integrate OpenCV into Qt Creator Android project的可能重复

【参考方案1】：

事实证明，.a 文件的顺序很重要。将它们按此顺序排列（将路径更改为路径）对我有用：

LIBS += \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_calib3d.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_flann.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_objdetect.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_contrib.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_video.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_ml.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_legacy.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_highgui.a \
    /media/Software/android/OpenCV-2.3.1/share/OpenCV/3rdparty/libs/armeabi-v7a/liblibjpeg.a \
    /media/Software/android/OpenCV-2.3.1/share/OpenCV/3rdparty/libs/armeabi-v7a/liblibpng.a \
    /media/Software/android/OpenCV-2.3.1/share/OpenCV/3rdparty/libs/armeabi-v7a/liblibtiff.a \
    /media/Software/android/OpenCV-2.3.1/share/OpenCV/3rdparty/libs/armeabi-v7a/liblibjasper.a \
    /media/Software/android/OpenCV-2.3.1/share/OpenCV/3rdparty/libs/armeabi-v7a/libzlib.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_ts.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_imgproc.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_core.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_androidcamera.a \
    /media/Software/android/OpenCV-2.3.1/libs/armeabi-v7a/libopencv_features2d.a

INCLUDEPATH += /media/Software/android/OpenCV-2.3.1/include/opencv/ \
               /media/Software/android/OpenCV-2.3.1/include/

【参考方案2】：

找到并添加 libtiff.a，它可能在 opencv 3rd 方库目录中。