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I just want to draw a polygon by points. And than use detect algorithms only inside this polygon area. Anyone know about that? (I dont want to use only rectangle-areas)

import numpy as np import cv2

def mouse_drawing(event, x, y, flags, params): if event == cv2.EVENT_LBUTTONDOWN: print("Left click") circles.append((x,y))

cap = cv2.VideoCapture(0)

circles = []

cv2.namedWindow("Frame") if len(circles) < 4: cv2.setMouseCallback("Frame", mouse_drawing)

while True: _, frame = cap.read()

for center_position in circles:
    cv2.circle(frame, center_position, 2, (0, 0, 255), -1)
points = np.array(circles)
if len(circles) >= 4:
    cv2.polylines(frame, np.int32([points]), 1, (255, 255, 255))

cv2.imshow("Frame", frame)

key = cv2.waitKey(1)
if key == 27:

    break
elif key == ord("d"):
    circles = []

cap.release() cv2.destroyAllWindows()

I just want to draw a polygon by points. And than use detect algorithms only inside this polygon area. Anyone know about that? (I dont want to use only rectangle-areas)

import numpy as np
import cv2
 
cv2

def mouse_drawing(event, x, y, flags, params):
    if event == cv2.EVENT_LBUTTONDOWN:
        print("Left click")
        circles.append((x,y))
 
circles.append((x,y))

cap = cv2.VideoCapture(0)
 
cv2.VideoCapture(0)

circles = []
 
[]

cv2.namedWindow("Frame")
if len(circles) < 4:
    cv2.setMouseCallback("Frame", mouse_drawing)
 
mouse_drawing)


while True:
    _, frame = cap.read()
 
cap.read()

    for center_position in circles:
     cv2.circle(frame, center_position, 2, (0, 0, 255), -1)
 points = np.array(circles)
 if len(circles) >= 4:
     cv2.polylines(frame, np.int32([points]), 1, (255, 255, 255))

 cv2.imshow("Frame", frame)

 key = cv2.waitKey(1)
 if key == 27:

     break
 elif key == ord("d"):
     circles = []

cap.release()
cv2.destroyAllWindows()
  
cap.release()
cv2.destroyAllWindows()