import cv2


image_path = r"D:\MyCodes\yolo_format\dataset\images\pic2.jpg"
ann_path = r"D:\MyCodes\yolo_format\dataset\labels\pic2.txt"

img = cv2.imread(image_path)

h, w, c = img.shape

with open(ann_path, mode='r', encoding='utf-8') as f:
    for line in f.readlines():
        def split_elm(*l):
            return tuple(map(float, l))
        cls, cx, cy, sw, sh = split_elm(*(line.split(' ')))

        x1 = int(w * (cx - 0.5 * sw))
        x2 = int(w * (cx + 0.5 * sw))
        y1 = int(h * (cy - 0.5 * sh))
        y2 = int(h * (cy + 0.5 * sh))

        cv2.rectangle(img, (x1, y1), (x2, y2), (255, 255, 0), 2)

cv2.imshow("Rect", img)
cv2.waitKey(0)