# Box2DKernel¶

class astropy.convolution.Box2DKernel(width, **kwargs)[source] [edit on github]

2D Box filter kernel.

The Box filter or running mean is a smoothing filter. It is not isotropic and can produce artifact, when applied repeatedly to the same data.

By default the Box kernel uses the linear_interp discretization mode, which allows non-shifting, even-sized kernels. This is achieved by weighting the edge pixels with 1/2.

Parameters: width : number Width of the filter kernel. mode : str, optional One of the following discretization modes: ‘center’ Discretize model by taking the value at the center of the bin. ‘linear_interp’ (default) 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 Box2DKernel
box_2D_kernel = Box2DKernel(9)
plt.imshow(box_2D_kernel, interpolation='none', origin='lower',
vmin=0.0, vmax=0.015)
plt.xlim(-1, 9)
plt.ylim(-1, 9)
plt.xlabel('x [pixels]')
plt.ylabel('y [pixels]')
plt.colorbar()
plt.show()


(png, svg, pdf)