[Bug 188539] Re: cvCalibrateCamera2 broken in python-opencv

[Karl Ostmo]

I have determined what was wrong with my usage.  The third argument to
the Python function cv.cvCalibrateCamera2 must be a one-dimensional
matrix of integers (e.g. type cv.CV_32SC1).  The cv.cvmSet function will
interpret its value argument as a "double", regardless of whether it was
an "int" to begin with.  If this function is used to populate the values
of a matrix of type cv.CV_32SC1, the values seem to be incorrectly
reinterpreted as integers on the binary level, rather than simply
truncating the fractional part.  Thus, when populating the matrix of
integers in Python, one must use the array notation, rather than cvmSet.

This works:
point_counts[3] = 15

while this does not:
cv.cvmSet(point_counts, 3, 0, 15)


A correct call to cv.cvCalibrateCamera2 would look like this:

	intrinsic, distortion = cv.cvCalibrateCamera2(
		object_points_matrix,	# Object points: a 3xN matrix, listing all the points in all the images
		corners_matrix,	# Image points: a 2xN matrix, listing all the 2D points in all the images
		point_counts,	# A vector (i.e. 1xM matrix) of point counts per image
		frame_size	# Image size, type CvSize
	)

-- 
cvCalibrateCamera2 broken in python-opencv
https://bugs.launchpad.net/bugs/188539
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