AiryDisk2DKernel

class astropy.convolution.AiryDisk2DKernel(radius, **kwargs)[source]

Bases: astropy.convolution.Kernel2D

2D Airy disk kernel.

This kernel models the diffraction pattern of a circular aperture. This kernel is normalized to a peak value of 1.

Parameters
radiusfloat

The radius of the Airy disk kernel (radius of the first zero).

x_sizeodd int, optional

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

y_sizeodd int, optional

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

modestr, 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.

factornumber, optional

Factor of oversampling. Default factor = 10.

Examples

Kernel response:

import matplotlib.pyplot as plt
from astropy.convolution import AiryDisk2DKernel
airydisk_2D_kernel = AiryDisk2DKernel(10)
plt.imshow(airydisk_2D_kernel, interpolation='none', origin='lower')
plt.xlabel('x [pixels]')
plt.ylabel('y [pixels]')
plt.colorbar()
plt.show()

()

../_images/astropy-convolution-AiryDisk2DKernel-1.png