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Drawing circles on an image with Matplotlib and NumPy
To draw a circle on an image with matplotlib and numpy, we can take the following steps −
Set the figure size and adjust the padding between and around the subplots.
Read an image from a file into an array.
Create x and y data points using numpy.
Create a figure and a set of subplots using subplots() method.
Display data as an image, i.e., on a 2D regular raster using imshow() method.
Turn off the axes.
Add patches on the current axes.
To display the figure, use show() method.
Example
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.patches import Circle
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
img = plt.imread('bird.jpg')
x = np.random.rand(5) * img.shape[1]
y = np.random.rand(5) * img.shape[0]
fig, ax = plt.subplots(1)
ax.imshow(img)
ax.axis('off')
for xx, yy in zip(x, y):
circ = Circle((xx, yy), 50, color='red')
ax.add_patch(circ)
plt.show()Output
Updated on: 04-Jun-2021
1K+ Views
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