MatUtils.py File Reference

File containing a method for finding a connected subset, centered around a starting index, in a matrix. More...

Functions
def	PyPO.MatUtils.findConnectedSubsets (mat, component, idx_start)
	Find extent of centered connected subset in a matrix. More...
def	PyPO.MatUtils.findRotation (self, v, u)
	Find rotation matrix to rotate v onto u. More...
def	PyPO.MatUtils.getAnglesFromMatrix (self, M)
	Find x, y and z rotation angles from general rotation matrix. More...

Detailed Description

File containing a method for finding a connected subset, centered around a starting index, in a matrix.

Used for creating masks for fitting Gaussians.

Function Documentation

findConnectedSubsets()

def PyPO.MatUtils.findConnectedSubsets	(		mat,
			component,
			idx_start
	)

Find extent of centered connected subset in a matrix.

Parameters

mat	Matrix of which to find largest connected subset.
component	Value on which to differentiate subset.
idx_start	Matrix index on which to center the subset.

Returns

Indices of row and column of limits of subset.

findRotation()

def PyPO.MatUtils.findRotation	(		self,
			v,
			u
	)

Find rotation matrix to rotate v onto u.

Parameters

v	Numpy array of length 3.
u	Numpy array of length 3.

getAnglesFromMatrix()

def PyPO.MatUtils.getAnglesFromMatrix	(		self,
			M
	)

Find x, y and z rotation angles from general rotation matrix.

Note that the angles are not necessarily the same as the original angles of the matrix. However, the matrix constructed by the found angles applies the same 3D rotation as the input matrix.

Parameters

M	Numpy array of shape (3,3) containg a general rotation matrix.

Returns

r Numpy array of length 3 containing rotation angles around x, y and z.