python 圖片中查找子圖片

import aircv as ac
import pyautogui

def matchImg(imgsrc, imgobj, confidencevalue=0.5):  # imgsrc=原始圖像，imgobj=待查找的圖片
    imsrc = ac.imread(imgsrc)
    imobj = ac.imread(imgobj)

    match_result = ac.find_template(imsrc, imobj,confidencevalue)  # {'confidence': 0.5435812473297119, 'rectangle': ((394, 384), (394, 416), (450, 384), (450, 416)), 'result': (422.0, 400.0)}
    if match_result is not None:
        match_result['shape'] = (imsrc.shape[1], imsrc.shape[0])  # 0為高，1為寬

    return match_result

imgsrc = "b.png"
imgobj = "a.png"
match_result = matchImg(imgsrc, imgobj)
print(match_result)