AiryDisk2DKernel

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

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:
radius : float

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

x_size : odd int, optional

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

y_size : odd int, optional

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

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 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()

(png, svg, pdf)

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