Draw coordinate system axis from pose estimation

img = cv.drawAxis(img, cameraMatrix, distCoeffs, rvec, tvec, length)

Input

• img input image. It must have 1 or 3 channels. In the output, the number of channels is not altered.
• cameraMatrix input 3x3 floating-point camera matrix A = [fx 0 cx; 0 fy cy; 0 0 1].
• distCoeffs vector of distortion coefficients [k1,k2,p1,p2,k3,k4,k5,k6,s1,s2,s3,s4] of 4, 5, 8 or 12 elements.
• rvec rotation vector of the coordinate system that will be drawn.
• tvec translation vector of the coordinate system that will be drawn.
• length length of the painted axis in the same unit as tvec (usually in meters).

Output

• img output image.

Given the pose estimation of a marker or board, this function draws the axis of the world coordinate system, i.e. the system centered on the marker/board. Useful for debugging purposes.