Overlay an image segmentation with Numpy and Matplotlib

To overlay an image segmentation with numpy, we can take the following Steps −

  • Make a masked array of 10×10 dimension.

  • Update the masked array with 1 for some region.

  • Make image data using numpy.

  • Mask an array where a condition is met, to get the masked data.

  • Create a new figure or activate an existing figure using figure() mrthod.

  • Use imshow() method to display data as an image, i.e., on a 2D regular raster.

  • To display the figure, use show() method.

Example

from matplotlib import pyplot as plt
import numpy as np
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
mask = np.zeros((10, 10))
mask[3:-3, 3:-3] = 1
im = mask + np.random.randn(10, 10) * 0.01
masked = np.ma.masked_where(mask == 0, mask)
plt.figure()
plt.subplot(1, 2, 1)
plt.imshow(im, 'gray', interpolation='none')
plt.subplot(1, 2, 2)
plt.imshow(im, 'gray', interpolation='none')
plt.imshow(masked, 'jet', interpolation='none', alpha=0.7)
plt.show()

Output

Updated on: 15-May-2021

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