在opencv中捕获并保存图像

Question

import cv2
import face_recognition


cap = cv2.VideoCapture(0)


face_locations = []

while True:

    ret, frame = cap.read()


    rgb_frame = frame[:, :, ::-1]


    face_locations = face_recognition.face_locations(rgb_frame)


    for top, right, bottom, left in face_locations:



        cv2.circle(frame,(int((left + right) / 2), top),15,(0, 0, 255), 2)
    cv2.circle(frame,(350 ,  150),5,(0, 255, 0), 1)



    cv2.imshow('Video', frame)


    if cv2.waitKey(25) == 13:
        break


cap.release()
cv2.destroyAllWindows()

结果截图：

目标：

只有当绿色圆圈在红色圆圈内并且保存的图像不应包含圆圈时，我才需要保存图像。

如果绿圈不在红圈里面，一定不能保存图片

Answer 1

以本题答案为依据：

x1, y1 -> 红圈位置

x2, y2 -> 绿色圆圈的位置

c1 -> 红圈半径

c2 -> 绿圈半径

import math

并且在导入后需要更改以下内容

#frame without circles
frameToSave = frame

#add circles to frame in live feed
cv2.circle(frame,(int((left + right) / 2), top),15,(0, 0, 255), 2)
cv2.circle(frame,(350 ,  150),5,(0, 255, 0), 1)

x1 = int((left + right) / 2)
y1 = top
c1 = 15

x2 = 350
y2 = 150
c2 = 5

d = math.sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1))

if c1 > ( d + c2 ):
    print("green circle inside red circle")
    cv2.imwrite(filename,frameToSave)
else:
    print("green circle not inside or not fully inside red circle")
    cv2.imwrite(filename,frameToSave)

进行了一些编辑以实现评论中的目标（带圆圈的实时提要，不带圆圈的保存图像）

在opencv中捕获并保存图像

capture and save image in opencv

python

opencv

face-recognition