My purpose is to build OpenCV with 3rd party jpeg support. By passing -D BUILD_JPEG=ON to cmake, I can see the object files being compiled. I wanted to copy the built jpeg library to the /usr/local/, but I dont see any library for libjpeg. I just see the object files. Do I need to put the object files in the library myself?
What is the signifigance of WITH_JPEG and BUILD_JPEG configuration variables in cmake?
WITH_JPEG means imread will able to read jpeg files using opencv jpeg lib or external jpeg lib.
BUILD_JPEG means opencv jpeg source files will be compile in opencv
in cmakecache.txt you can find
//Build libjpeg from source ----> use source in third party folder
BUILD_JPEG:BOOL=ON
//Include JPEG support ----> opencv can open jpeg file
WITH_JPEG:BOOL=ON
If you want to read jpeg with internal source files -DBUILD_JPEG:BOOL=ON -DWITH_JPEG:BOOL=ON and don't forget to delete CMakeCache.txt
so, if WITH_JPEG is OFF, then no jpeg files can be read, although a libjpeg package is installed in the system through apt-get?
Asked: 2017-09-10 01:50:04 -0600
Seen: 3,103 times
Last updated: Sep 10 '17
