CODEWITHSUNDEEP
pythonopencv
user15373408
user15373408

Reputation:

Is there any possible way to get findout extreme points exactly on static image in python?

I need to findout extreme points of a image(cloth). I have tried with https://www.geeksforgeeks.org/find-co-ordinates-of-contours-using-opencv-python/ but i need to findout like this,enter image description here

But the current issue is for some images it is detecting currectly and for some images it is not. Can anyone help on this?

the successed image is,

enter image description here

the failed image is, enter image description here

Original image of the failed one is, enter image description here

Am I doing any wrong methods here? If yes, please suggest me the right one!

Upvotes: 1

Views: 288

Answers (1)

Vatsal Parsaniya
Vatsal Parsaniya

Reputation: 899

Use the following method.

  • change contour approximation variable according to your desired number of points. I have choose 0.0035.
import cv2

image = cv2.imread("image.png")

gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
_, threshold_image = cv2.threshold(gray_image, 250, 255, cv2.THRESH_BINARY_INV)
cv2.imshow("threshold_image", threshold_image)

contours, hierarchy = cv2.findContours(threshold_image, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
selected_contour = max(contours, key=lambda x: cv2.contourArea(x))
approx = cv2.approxPolyDP(selected_contour, 0.0035 * cv2.arcLength(selected_contour, True), True)

cv2.drawContours(image, [approx], 0, (0, 0, 255), 5)

for point in approx:
    x, y = point[0]
    string = str(x) + " " + str(y)
    cv2.circle(image, (x, y), 2, (255, 0, 0), 2)
    cv2.putText(image, string, (x, y), cv2.FONT_HERSHEY_COMPLEX, 0.5, (0, 255, 0))

cv2.imshow("cordinate image", image)

cv2.waitKey(0)
cv2.destroyAllWindows()
Threshold Image Cordinate Image
enter image description here enter image description here

Upvotes: 3

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