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I am writting code that uses opencv and i need to have access to PI (3.14...), I know that standard math.h has the efinition, but I found it not easy to uses it is not exposed by default.
Does OpenCV has any definition for PI?
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OpenCV is the huge open-source library for the computer vision, machine learning, and image processing and now it plays a major role in real-time operation which is very important in today's systems. By using it, one can process images and videos to identify objects, faces, or even handwriting of a human.
Master C and Embedded C Programming- Learn as you go Here we will see how to use the PI constant in C++ program. The PI constant is present in the cmath header file. The name of the constant is M_PI. We can simply include that header file, and use the constant to perform operation.
Using Constants in C: In this program the value of π is defined in two different ways. One is by using using the preprocessor directive '#define' to make 'PI' equal to 3.142857. The other uses the key work 'const' to define a double called 'pi' equal to 22.0/7.0.
Yes. It defines CV_PI.
I think it's defined in the cv namespace.
Edit: At a closer look it seems that it's available in the global namespace.
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In OpenCV python, it seems CV_PI (or cv2.CV_PI) doesn't exist, use numpy.pi.
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Currently CV_PI seems to be in cvdef.h, line 193:
cvdef.h
cvdef.h line 193
#define CV_PI 3.1415926535897932384626433832795
I can confirm as others have mentioned that cv::PI does not seem to be available any longer (probably removed in the OpenCV 2 to OpenCV 3 change over when the OpenCV 1 legacy stuff was depreciated).
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