Ubuntu14.04安装好opencv3.0.0之后，进行测试:
$./DisplayImage lena.jpg
得到如下结果：
OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvNamedWindow, file /home/aborn/software/OpenCV-3.0.0/modules/highgui/src/
window.cpp, line …
网上给的解释是： GTK+2.x要先于OpenCV安装(You should remove the current installation of opencv from your system; rebuild your opencv lib after installing gtk dev lib in the correct path; and reinstall the compiled opencv lib. )
解决方法：
1.卸载opencv
（1）移除式卸载：apt-get remove 软件名1 软件名2 …;（移除软件包）
（2）清除式卸载 ：apt-get --purge remove 软件名1 软件名2...;(同时清除配置)
建议选择清除式卸载
（3）卸载不管用的话，直接到opencv解压目录把解压出的opencv包删掉
2.查看没安装的文件，没装的装上
之前安装时的命令：
sudo apt-get install build-essential cmake libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
查看方法：
$ dpkg –listfiles cmake(查询系统中属于cmake的文件)
$ dpkg –listfiles libgtk2.0-dev(查询系统中属于libgtk2.0-dev的文件)
$ dpkg –listfiles 其他包名
3.重新安装opencv并进行测试