进行图像识别时，怎么解决原图不同比例下截图的识别

Question

截图大小固定，当原图放大或缩小后，如何识别呢？

代码如下

# coding:utf8
import cv2

def test():
        imgsr = cv2.imread("main.jpg")
        imgtm = cv2.imread("aim.jpg")
        # 获取模板图片的高和宽
        imgtmh1 = imgtm.shape[0]
        imgtmw1 = imgtm.shape[1]

        # 与模版比对
        res = cv2.matchTemplate(imgsr, imgtm, cv2.TM_CCOEFF_NORMED)
        min_val, max_val, min_loc, max_loc = cv2.minMaxLoc(res)
        img = cv2.rectangle(imgsr, max_loc, (max_loc[0] + imgtmw1, max_loc[1] + imgtmh1), (0, 0, 255), 2)

        cv2.imshow('Image', img)
        print(max_loc[0] + imgtmw1, max_loc[1] + imgtmh1)
        cv2.waitKey(0)
        cv2.destroyAllWindows()
test()