bboxを画像に反映できません、どのような解決策があるでしょうか？

import torch
import torchvision
from torch.utils.data import Dataset, DataLoader
import numpy as np
import os
import json
from matplotlib.transforms import Bbox
import cv2
import math
from PIL import Image
from skimage import io
from matplotlib.pyplot import plot as plt
import matplotlib.image as mpimg
import base64
from pycocotools.coco import COCO
import pprint



TRAIN_DENSE_PATH = '/Users/ryutaro/PycharmProjects/tiny_person_detection/tiny/tiny_set/train/labeled_dense_images'
ANNO_PATH = '/Users/ryutaro/PycharmProjects/tiny_person_detection/tiny/tiny_set/annotations/tiny_set_train_with_dense.json'

"""  
with open (ANNO_PATH, 'r') as json_file:
    tiny = json.load(json_file)
    #print(tiny.keys())
    images_list = tiny['images']
    image_0 = images_list[0]
    print(image_0)
    anno = tiny["annotations"]
    #print(anno)
    anno_0 = anno[0]
    print(anno_0)
    bbox0 = anno_0['bbox']
    print(bbox0)
    #coco format [x,y,width,height]
"""
with open(ANNO_PATH, 'r') as f:
    tiny = json.load(f)

print(tiny.keys())

images_list = tiny['images']
print(images_list[0])

anno_list = tiny['annotations']
anno_0 = anno_list[0]
print(anno_0)

image_id = anno_0['image_id']
bbox0 = anno_0['bbox']
print(bbox0)
xmin = int(bbox0[0])
ymin = int(bbox0[1])
xmax = xmin + int(bbox0[2])
ymax = ymin + int(bbox0[3])

tiny_image0 = cv2.imread( '/Users/ryutaro/PycharmProjects/tiny_person_detection/tiny/tiny_set/train/labeled_images/bb_V0032_I0001640.jpg')


cv2.rectangle(tiny_image0, (xmin, ymin), (xmax, ymax), (255, 0, 0), 2)
cv2.imshow('as', tiny_image0)
cv2.waitKey(0)