tutorial_12.py

import cv2 as cv
import numpy as np


def template_demo():
    tpl = cv.imread("./resource/eye.jpg")
    target = cv.imread("./resource/girl.jpg")
    cv.imshow("template demo", tpl)
    cv.imshow("target demo", target)
    #         TM_SQDIFF_NORMED = 1 标准化差值平方和匹配
    #         TM_CCORR_NORMED = 3  标准化相关匹配
    #         TM_CCOEFF_NORMED = 5 标准化相关性系数匹配
    methods = [cv.TM_SQDIFF_NORMED, cv.TM_CCORR_NORMED, cv.TM_CCOEFF_NORMED]
    th, tw = tpl.shape[:2]
    for md in methods:
        print(md)
        result = cv.matchTemplate(target, tpl, md)
        min_val, max_val, min_loc, max_loc = cv.minMaxLoc(result)
        if md == cv.TM_SQDIFF_NORMED:
            tl = min_loc
        else:
            tl = max_loc
        br = (tl[0] + tw, tl[1] + th)
        cv.rectangle(target, tl, br, (0, 0, 255), 2)
        cv.imshow("match-" + np.str(md), target)


print("-------------hello python-----------------")
src = cv.imread("./resource/girl.jpg")
cv.namedWindow("input image", cv.WINDOW_AUTOSIZE)
cv.imshow("input image", src)
template_demo()
cv.waitKey(0)

cv.destroyAllWindows()