shows an image with a bounding box

show_img_with_bb.py

import matplotlib.pyplot as plt
import matplotlib.patches as patches
from PIL import Image

# source: https://stackoverflow.com/a/37437395/8265079

x_0, y_0, x_1, y_1 = annotation_item['bounding_box']

im = Image.open('my_img.png')
# Create figure and axes
fig, ax = plt.subplots()
# Display the image
ax.imshow(im)
# Create a Rectangle patch
rectangle = patches.Rectangle((x_0, y_0), x_1 - x_0, y_1 - y_0, linewidth=2, edgecolor='r', facecolor='none')
# Add the patch to the Axes
ax.add_patch(rectangle)

rx, ry = rectangle.get_xy()
cx = rx + rectangle.get_width()/2.0
cy = ry + rectangle.get_height()/2.0
ax.annotate("Rectangle", (cx, cy), color='black', weight='bold', fontsize=10, ha='center', va='center')

plt.show()