im_drawbox.py

def im_drawbox(window, color='r', class_name='', score=0.0):
    """
    Add a detection window (bounding box) into the current plot image.

    window: tuple-like of length 4 (xmin, ymin, xmax, ymax)
    """
    import matplotlib.pyplot as plt
    xmin, ymin, xmax, ymax = window
    coords = (ymin, xmin), ymax - ymin, xmax - xmin
    currentAxis = plt.gca()
    currentAxis.add_patch(
        plt.Rectangle(*coords, fill=False, edgecolor=color, linewidth=3)
    )
    currentAxis.text(ymin, xmin - 5,
                     '{:s} ({:.3f})'.format(str(class_name), score),
                     bbox=dict(facecolor=color, alpha=0.5),
                     fontsize=12, color='white')