目标检测和边界框

%matplotlib inline
import gluonbook as gb
from mxnet import image
import sys

gb.set_figsize()
img = image.imread('./catdog.jpg').asnumpy()
gb.plt.imshow(img)

dog_bbox,cat_bbox = [60,45,378,516],[400,112,655,493]

def bbox_to_rect(bbox,color):
    return gb.plt.Rectangle(
        xy=(bbox[0], bbox[1]), width=bbox[2]-bbox[0], height=bbox[3]-bbox[1],
        fill=False, edgecolor=color, linewidth=2)

fig = gb.plt.imshow(img)
fig.axes.add_patch(bbox_to_rect(dog_bbox,'blue'))
fig.axes.add_patch(bbox_to_rect(cat_bbox,'red'))