template.py

'''
import cv2
import numpy as np

img_bgr = cv2. imread('image/tem.png')
img_gray = cv2.cvtColor(img_bgr,cv2.COLOR_BGR2GRAY)

template = cv2.imread('image/1.jpg',0)
w,h = template.shape[::-1]

res = cv2.matchTemplate(img_gray,template,cv2.TM_CCOEFF_NORMED)
threshold = 0.5
loc = np.where(res >= threshold)

for pt in zip(*loc[::-1]):
    cv2.rectangle(img_bgr,pt,(pt[0]+w,pt[1]+h),(0,255,255),2)

cv2.imshow('detected',img_bgr)
'''

import cv2 as cv
import numpy as np
from matplotlib import pyplot as plt
img = cv.imread('input.jpg',0)
img2 = img.copy()
template = cv.imread('temp.jpg',0)
w, h = template.shape[::-1]
# All the 6 methods for comparison in a list
methods = ['cv.TM_CCOEFF', 'cv.TM_CCOEFF_NORMED', 'cv.TM_CCORR',
            'cv.TM_CCORR_NORMED', 'cv.TM_SQDIFF', 'cv.TM_SQDIFF_NORMED']
for meth in methods:
    img = img2.copy()
    method = eval(meth)
    # Apply template Matching
    res = cv.matchTemplate(img,template,method)
    min_val, max_val, min_loc, max_loc = cv.minMaxLoc(res)
    # If the method is TM_SQDIFF or TM_SQDIFF_NORMED, take minimum
    if method in [cv.TM_SQDIFF, cv.TM_SQDIFF_NORMED]:
        top_left = min_loc
    else:
        top_left = max_loc
    bottom_right = (top_left[0] + w, top_left[1] + h)
    cv.rectangle(img,top_left, bottom_right, 255, 2)
    plt.subplot(121),plt.imshow(res,cmap = 'gray')
    plt.title('Matching Result'), plt.xticks([]), plt.yticks([])
    plt.subplot(122),plt.imshow(img,cmap = 'gray')
    plt.title('Detected Point'), plt.xticks([]), plt.yticks([])
    plt.suptitle(meth)
    plt.show()