How to decrease sensitivity when detecting objects in image. [closed]

asked 2019-07-12 17:57:28 -0500

updated 2019-07-13 04:42:27 -0500

supra56 gravatar image

I am trying to measure the size of an object in the image, but the code I am working with is only looking for the details in the picture and not the object I want. Here is my code:

edged = cv2.Canny(gray, 50, 20) #50 and 20 are tshld one and two
edged = cv2.dilate(edged, None, iterations=1)
edged = cv2.erode(edged, None, iterations=1)

cnts = cv2.findContours(edged.copy(), cv2.RETR_EXTERNAL,
cnts = imutils.grab_contours(cnts)

(cnts, _) = contours.sort_contours(cnts)
pixelsPerMetric = None

for c in cnts:
    # if the contour is not sufficiently large, ignore it
    if cv2.contourArea(c) < 60: 

    orig = image.copy()
    box = cv2.minAreaRect(c)
    box = if imutils.is_cv2() else cv2.boxPoints(box)
    box = np.array(box, dtype="int")

    box = perspective.order_points(box)
   cv2.drawContours(orig, [box.astype("int")], -1, (0, 255, 0), 3)

Note: the image below is the result of my code. I want to be able to detect the green target and measure it's dimensions. However, the box is only enclosing small portions of the image and not the entire target. If I should post entire code, let me know!


image description

edit retag flag offensive reopen merge delete

Closed for the following reason the question is answered, right answer was accepted by sturkmen
close date 2020-09-27 13:36:35.677342


These pictures are hardly helpful. I cannot see no box...

Witek gravatar imageWitek ( 2019-07-13 16:36:39 -0500 )edit

yes, that is the issue. I need the code to create a box around the target and measure its dimensions but it isn't finding the target :/

berlin01 gravatar imageberlin01 ( 2019-07-14 16:46:48 -0500 )edit

OK, I think I understand now. Instead of finding edges, do image thresholding and continue with your code. It should work.

Witek gravatar imageWitek ( 2019-07-15 03:33:52 -0500 )edit

It worked! Thank you so much :D

berlin01 gravatar imageberlin01 ( 2019-07-15 17:07:48 -0500 )edit

You're welcome.

Witek gravatar imageWitek ( 2019-07-16 04:41:29 -0500 )edit