Ubuntu 14.04 安装opencv3.0后，caffe编译出现connot find -lopencv_imgcodecs的解决方式：
先将Makefile.config文件中
OPENCV_VERSION :=
3 注释掉，只修改USE_OPENCV := 1
修改后的结果：
USE_OPENCV := 1
#OPENCV_VERSION := 3
在caffe根目录下，找到Makefile文件，打开文件
查找“Derive include and lib directories”一节，修改“LIBRARIES +=”的最后一行（LIBRARIES +=opencv_imgcodecs ），增加opencv_imgcodecs
opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs
（此时应该变为LIBRARIES += opencv_imgcodecs opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs）
保存，退出。
注意：在做前边的基础工作是将Makefile.config文件中
OPENCV_VERSION :=
3 注释掉，只修改USE_OPENCV := 1
再在caffe目录下，sudo make all -j8一下，问题解决
# Uncomment
if you're using OpenCV 3OPENCV_VERSION :=
3
# Uncomment
if you're using OpenCV 3OPENCV_VERSION :=
3