opencv(10):error while loading shared libraries: libopencv_xxx: cannot open shared object file

        调用opencv自带的可执行文件时，找不到对应的库，报错如下：

./opencv_createsamples: error while loading shared libraries: libopencv_objdetect.so.2.4: cannot open shared object file: No such file or directory

./opencv_createsamples: error while loading shared libraries: libopencv_calib3d.so.2.4: cannot open shared object file: No such file or directory

./opencv_createsamples: error while loading shared libraries: libopencv_highgui.so.2.4: cannot open shared object file: No such file or directory

......

报错原因：

        可执行文件opencv_createsamples是opencv2.4.13版本的，而我电脑上opencv默认版本为opencv3.2；这里只需要将opencv2.4.13版本的libopencv_objdetect.so.2.4这里库文件放到对应位置即可。

解决办法--以libopencv_objdetect.so.2.4为例进行分析

        注：该解决办法对其他版本的opencv也适用，只需要找到可执行文件对应版本的库文件即可

(1)找到libopencv_objdetect.so.2.4文件（这一步有多种方法）

        我先前进行了opencv2.4.13源码编译，如下所示（opencv源码编译可以搜“ubuntu安装opencv”相关内容）；

        直接搜索libopencv_objdetect.so.2.4，找到文件准备拷贝 ;文件地址为：

/home/meng/softwares/opencv-2.4.13/release/lib/libopencv_objdetect.so.2.4

（2）确认libopencv_objdetect.so.2.4需要放置的位置

        到计算机目录下（“/”）,搜索libopencv_objdetect.so，结果如图：第一个红框--需要将libopencv_objdetect.so.2.4放置的位置，如下代码；第二个红框--安装opencv2.4.13的位置（如果没有安装，不用管）；第三个红框，我源码编译opencv2.4.13的位置

/usr/lib/x86_64-linux-gnu

（3）拷贝libopencv_objdetect.so.2.4到指定位置

sudo cp /home/meng/softwares/opencv-2.4.13/release/lib/libopencv_objdetect.so.2.4  /usr/lib/x86_64-linux-gnu

（4）其他类似解决

sudo cp /home/meng/softwares/opencv-2.4.13/release/lib/libopencv_calib3d.so.2.4 /usr/lib/x86_64-linux-gnu

sudo cp /home/meng/softwares/opencv-2.4.13/release/lib/libopencv_highgui.so.2.4 /usr/lib/x86_64-linux-gnu

sudo cp /home/meng/softwares/opencv-2.4.13/release/lib/libopencv_imgproc.so.2.4 /usr/lib/x86_64-linux-gnu

sudo cp /home/meng/softwares/opencv-2.4.13/release/lib/libopencv_core.so.2.4 /usr/lib/x86_64-linux-gnu