cwitools.measurement.moment2d

cwitools.measurement.moment2d(x_grid, y_grid, p, q, fxy)

Calculate image moment of order p in x and q in y.

Mpq = SUM(x_grid^p * y_grid^q * fxy) / SUM(fxy)

Parameters:

• x_grid (numpy.ndarray) – 2D meshgrid of x-values
• y_grid (numpy.ndarray) – 2D meshgrid of y-values
• p (int) – Moment order in x.
• q (int) – Moment order in y.
• fxy (numpy.ndarray) – Array of weights representing the 2D distribution being measured; e.g. flux or surface brightness.

Returns:

The value of the requested image moment.

Return type:

float