Defect Detection using OpenCV

Dear Members,

I am trying to detect defect in image by comparing defected image with original one. I have achieved it so far using canny algorithm.

Now i have to fill color to defected area after applying canny algorithm to it.

Kindly let me know for the same.

Thanks in advance.

Comments

please show us, what you tried, code, images ...

berak (Apr 26 '18)edit

Hi Berak,

 Thanks for reply,

I am attaching code:

im = cv2.imread("C:/Original_Image.jpg", 0)
im1 = cv2.imread("C:/Defect_Image.jpg", 0)

diff = cv2.absdiff(im, im1)
#cv2.imwrite("C:\this.jpg", diff)
ret, thresh = cv2.threshold(diff, 0, 255, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)
contours, hierarchy, we = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
mask = cv2.cvtColor(im1, cv2.COLOR_GRAY2BGR)

try:
    hierarchy = hierarchy[0]
except:
    hierarchy = []

for contour, hier in zip(contours, hierarchy):
    (x, y, w, h) = cv2.boundingRect(contour)
    cv2.rectangle(mask, (x, y), (x+w, y+h), (255, 0, 0), 3)

cv2.imwrite("C:\mask.jpg", mask)
cv2.imwrite("C:\thresh.jpg", thresh)

Ranganath (Apr 26 '18)edit

im: original image without defect im1: with defect (A scratch on image)

Ranganath (Apr 26 '18)edit

problem what i am facing is i am not able to get rectangle shape on defected areas.

Ranganath (Apr 26 '18)edit

Images ... my guess is your contours are not closed hence incorrect bounding rects

StevenPuttemans (Apr 27 '18)edit

Hi Steven,

  How to work on that?

Ranganath (Apr 30 '18)edit

add a comment

import cv2 im = cv2.imread("image.jpg", 0) im1 = cv2.imread("image1.jpg", 0) diff = cv2.absdiff(im, im1) ret, thresh = cv2.threshold(diff, 0, 255, cv2.THRESH_BINARY_INV+cv2.THRESH_OTSU) contours, hierarchy = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE) mask = cv2.cvtColor(im1, cv2.COLOR_GRAY2BGR) try: hierarchy = hierarchy[0] except: hierarchy = [] for contour in contours[:-1]: (x, y, w, h) = cv2.boundingRect(contour) area = cv2.contourArea(contour) if area>100: cv2.rectangle(im1, (x, y), (x+w, y+h), (255, 0, 0), 3) cv2.imshow("mask", im1) cv2.imshow("thresh", thresh) cv2.waitKey(0)

Defect Detection using OpenCV

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