Gaussian2DKernel

class astropy.convolution.Gaussian2DKernel(x_stddev, y_stddev=None, theta=0.0, **kwargs)[source] [edit on github]

Bases: astropy.convolution.Kernel2D

2D Gaussian filter kernel.

The Gaussian filter is a filter with great smoothing properties. It is isotropic and does not produce artifacts.

Parameters:

x_stddev : float

Standard deviation of the Gaussian in x before rotating by theta.

y_stddev : float

Standard deviation of the Gaussian in y before rotating by theta.

theta : float

Rotation angle in radians. The rotation angle increases counterclockwise.

x_size : odd int, optional

Size in x direction of the kernel array. Default = 8 * stddev.

y_size : odd int, optional

Size in y direction of the kernel array. Default = 8 * stddev.

mode : str, optional

One of the following discretization modes:
  • ‘center’ (default)
    Discretize model by taking the value at the center of the bin.
  • ‘linear_interp’
    Discretize model by performing a bilinear interpolation between the values at the corners of the bin.
  • ‘oversample’
    Discretize model by taking the average on an oversampled grid.
  • ‘integrate’
    Discretize model by integrating the model over the bin.

factor : number, optional

Factor of oversampling. Default factor = 10.

Examples

Kernel response:

import matplotlib.pyplot as plt
from astropy.convolution import Gaussian2DKernel
gaussian_2D_kernel = Gaussian2DKernel(10)
plt.imshow(gaussian_2D_kernel, interpolation='none', origin='lower')
plt.xlabel('x [pixels]')
plt.ylabel('y [pixels]')
plt.colorbar()
plt.show()

(png, svg, pdf)

../_images/astropy-convolution-Gaussian2DKernel-1.png