opencv 24 houghcircle | circle detection

houghcircle detection after blurring gray image

blur

#main.py

import numpy as np

import cv2

cap = cv2.VideoCapture("assets/plate.mp4")

while True:

    ret, frame = cap.read()

    width = int(cap.get(3))

    height = int(cap.get(4))

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    blur = cv2.medianBlur(gray, 5)

    circles = cv2.HoughCircles(blur, cv2.HOUGH_GRADIENT, 1, 50, param1=50,

                               param2=50, minRadius=10, maxRadius=100)

    if not circles is None:

        detected_circles = np.uint16(np.around(circles))

        for (x, y, r) in detected_circles[0, :]:

            cv2.circle(frame, (x, y), r, (0, 255, 0), 2)

    cv2.imshow('frame', frame)

    cv2.imshow('gray', gray)

    cv2.imshow('blur', blur)

    if cv2.waitKey(1) == ord('q'):

        break

    if cv2.waitKey(1) == ord('p'):

        # wait until any key is pressed

        cv2.waitKey(-1)

cap.release()

cv2.destroyAllWindows()

reference:

https://www.youtube.com/watch?v=dp1r9oT_h9k&list=PLS1QulWo1RIa7D1O6skqDQ-JZ1GGHKK-K&index=38