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The mapping between the wikipedia notation and OpenCV matrix names is as follows:

• measurementMatrix == H_k
• processNoiseCov == Q_k
• measurementNoiseCov == R_k
• errorCovPost == P_k|k
• statePost == x_k|k
• transitionMatrix == F_k
• controlMatrix (rarely used) == B_k

The values to put in those matrices is, of course, highly dependent on what you're actually doing, and not something we can tell you.