Help to accomplish template matching please

asked 2020-01-08 05:43:00 -0600

Ajoy
1

updated 2020-01-08 08:45:24 -0600

supra56

943 ●9 ●6

image description

import cv2
import numpy as np
img_rgb = cv2.imread('1.jpeg')
img_gray = cv2.cvtColor(img_rgb, cv2.COLOR_BGR2GRAY)
template = cv2.imread('template.jpg', 0)
w, h = template.shape[::-1]
res = cv2.matchTemplate(img_gray, template, cv2.TM_CCOEFF_NORMED)
threshold = 0.80
loc = np.where(res >= threshold)
for pt in zip(*loc[::-1]):
    cv2.rectangle(img_rgb, pt, (pt[0] + w, pt[1] + h), (0, 0, 255), 2)
cv2.imwrite("result.jpg", img_rgb)

Can I please get a helping hand in accomplishing template detection please. The above code is not working for a similar template image ( attached )

$C:\fakepath\template.jpg$

answered 2020-01-08 08:41:15 -0600

supra56

943 ●9 ●6

updated 2020-01-08 14:55:00 -0600

Don't used output of 1.jpeg. Use original w/out rectangle. Try this with images and see what happend:

I also removed threshold too. Here is code:

import cv2
import numpy as np

img = cv2.imread("simpsons.jpg")
gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
template = cv2.imread("barts_face.jpg", 0)
w, h = template.shape[::-1]

result = cv2.matchTemplate(gray_img, template, cv2.TM_CCOEFF_NORMED)
loc = np.where(result >= 0.4)

for pt in zip(*loc[::-1]):
    cv2.rectangle(img, pt, (pt[0] + w, pt[1] + h), (0, 255, 0), 3)

cv2.imwrite('Result1.jpg', img)
cv2.imshow("img", img)

cv2.waitKey(0)
cv2.destroyAllWindows()

image of 1.jpeg: image description

And template too: image description

And output: image description

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Comments

Thank you Supra. I think I need an appropriate template image. I've been struggling to get the right template image. Your code holds good, but unfortunately because my template image is not effective, my results also fail miserably. :(

Ajoy ( 2020-01-08 10:21:48 -0600 )edit

@Ajoy. Can you post original images? You can't used black template to match original image. Did you try images as above?

supra56 ( 2020-01-08 13:15:47 -0600 )edit

The original image is as same as the image above without the Red Rectangles and the template is the black single inverted triangle I have shown. I am taking your point regarding the black template and am going to try it with the white template.

Ajoy ( 2020-01-08 17:25:48 -0600 )edit

:( even a non black template does not give expected results

Ajoy ( 2020-01-08 18:23:50 -0600 )edit

Yes!. It will return.

supra56 ( 2020-01-08 20:18:20 -0600 )edit

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