error while loading shared libraries: libopencv_core.so.2.4: cannot open shared object file: No such

在ubuntu下编译opencv程序后，执行报下面到错误：
error while loading shared libraries: libopencv_core.so.2.4: cannot open shared object file: No such file or directory
解决方法：找到libopencv_开头到库的目录，在/usr/local/lib下面，在/etc/ld.so.conf.d/下面新建一个opencv.conf，里面写入/usr/local/lib，最后执行下sudo ldconfig -v即可。
参考： http://stackoverflow.com/questions/12335848/opencv-program-compile-error-libopencv-core-so-2-4-cannot-open-shared-object-f