Note
Click here to download the full example code
Visualizing the motion energy filtersΒΆ
This example demonstrates how to display a motion energy filter from the pyramid.
import moten
pyramid = moten.pyramids.MotionEnergyPyramid(stimulus_vhsize=(768, 1024),
stimulus_fps=24)
animation = pyramid.show_filter(1337)

The animation should look something like this:
These are the filter parameters:
from pprint import pprint
pprint(pyramid.filters[1337])
Out:
{'aspect_ratio': 1.3333333333333333,
'centerh': 0.1416666666666666,
'centerv': 0.10624999999999996,
'direction': 180.0,
'filter_temporal_width': 16.0,
'spatial_env': 0.0375,
'spatial_freq': 16.0,
'spatial_phase_offset': 0.0,
'stimulus_fps': 24.0,
'temporal_env': 0.3,
'temporal_freq': 4.0}
(Ignore this code block. It is needed to display the animation as a video on this website)
output = '../../docs/build/html/_downloads/example_moten_filter.mp4'
fig = animation._fig
title = 'Example filter:\ndirection of motion=180, spatial fq=16cpi, temporal fq=4Hz'
fig.suptitle(title)
animation.save(output)
# sphinx_gallery_thumbnail_number = 2
import matplotlib.pyplot as plt
spatial_component = pyramid.get_filter_spatial_quadrature(1337)[1]
fig, ax = plt.subplots()
ax.matshow(spatial_component, vmin=-1, vmax=1, cmap='coolwarm')
__ = ax.set_xticks([])
__ = ax.set_yticks([])

Total running time of the script: ( 0 minutes 3.372 seconds)