draw_bbox.py

import cv2

bbox_start = (-1, -1)
bbox_end = (-1, -1)
drawing = False  

image_path = 'images/fatty-corgi.jpg'

image = cv2.resize(cv2.imread(image_path), (512, 512))
image_copy = image.copy()

def draw_bbox(event, x, y, flags, param):
    global bbox_start, bbox_end, drawing, image

    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        bbox_start = (x, y)
        bbox_end = bbox_start

    elif event == cv2.EVENT_MOUSEMOVE:
        if drawing:
            image = image_copy.copy()
            cv2.rectangle(image, bbox_start, (x, y), (0, 0, 255), 2)

    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False
        bbox_end = (x, y)
        cv2.rectangle(image, bbox_start, bbox_end, (0, 0, 255), 2)
        # print(f"BBox Coordinates: Start: {bbox_start}, End: {bbox_end}\n")
        print(f"bbx_start_point= ({bbox_start[0]}, {bbox_start[1]}), ")
        print(f"bbx_end_point= ({bbox_end[0]}, {bbox_end[1]})")
        
        x1, y1 = bbox_start
        x2, y2 = bbox_end

cv2.namedWindow("Image")
cv2.setMouseCallback("Image", draw_bbox)

while True:
    cv2.imshow("Image", image)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cv2.destroyAllWindows()