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How to import opencv and ofxcv namespaces?


Asked by Lilyana Hoover on Dec 08, 2021 FAQ



OpenCv uses the cv namespace, and ofxCv uses the ofxCv namespace. You can automatically import them by writing this in your .cpp files: If you look inside the ofxCv source, you'll find lots of cases of ofxCv:: and cv::. In some rare cases, you'll need to write cv:: in your code.
Also Know,
If you look inside the ofxCv source, you'll find lots of cases of ofxCv:: and cv::. In some rare cases, you'll need to write cv:: in your code. For example, on OSX Rect and Point are defined by OpenCv, but also MacTypes.h. So if you're using an OpenCv Rect or Point you'll need to say so explicitly with cv::Rect or cv::Point to disambiguate.
Subsequently, You should import cv2. OpenCV releases two types of Python interfaces, cv and cv2. latest one is cv2. This will give you an idea whether you have installed opencv correctly.
In addition,
Download OpenCV source. It can be from Sourceforge (for official release version) or from Github (for latest source). Extract it to a folder, opencv and create a new folder build in it. Click on Browse Source... and locate the opencv folder. Click on Browse Build... and locate the build folder we created.
Thereof,
By declaring using namespace cv;, in the following, the library functions can be accessed without explicitly stating the namespace. As a first step, the OpenCV python library is imported. The proper way to do this is to additionally assign it the name cv, which is used in the following to reference the library.