This page was generated from: notebooks/other/make_banner.ipynb

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%load_ext autoreload
%autoreload 2
%config InlineBackend.rc = {'figure.figsize': (10,6)}
%matplotlib inline

Generate banner

This banner uses Nanomesh to generate the banner for Nanomesh.

from nanomesh import Image
from skimage import io
import numpy as np
import matplotlib.pyplot as plt
from skimage.color import rgb2gray

Load the source image.

banner_o = io.imread(r'source_text_o.png')
plane = Image(rgb2gray(banner_o))

seg = plane.binary_digitize(threshold=0.5)
seg.show()

<AxesSubplot:xlabel='x', ylabel='y'>

Contour finding

from nanomesh import Mesher2D

mesher = Mesher2D(seg.image)
mesher.generate_contour(max_edge_dist=10)
mesher.plot_contour()

<AxesSubplot:title={'center':'line mesh'}>

Create the mesh

And compare with original image.

mesh = mesher.triangulate(opts='pq30a2500')
seg.compare_with_mesh(mesh)

<AxesSubplot:title={'center':'triangle mesh'}>

Create the banner using matplotlib

plt.rcParams['image.cmap'] = 'gist_rainbow'

banner_no_o = io.imread(r'source_text_no_o.png')

tri_mesh = mesh.get('triangle')

points = tri_mesh.points
triangles = tri_mesh.cells
labels = tri_mesh.labels

x, y = points.T[::-1]

fig, ax = plt.subplots(figsize=(8, 2))
fig.tight_layout(pad=0)

ax.imshow(banner_no_o)
ax.axis('off')
ax.margins(0)

colors = np.arange(len(triangles))
np.random.shuffle(colors)  # mix up the colors
mask_o = (labels == 1)
ax.tripcolor(x, y, triangles=triangles, mask=mask_o, facecolors=colors)
ax.triplot(x, y, triangles=triangles, mask=mask_o, color='black', lw=0.5)

mask_rest = (labels == 2)
ax.triplot(x, y, triangles=triangles, mask=mask_rest, lw=0.5, alpha=0.8)

plt.savefig('banner.png', bbox_inches='tight')

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