opencv 调整实时摄像头的窗口大小

Question

我已经关注this tutorial 并设法进行了面部检测，年龄+性别就像this video 一样

现在我面临的问题是应用程序的窗口大小非常小，我不知道也找不到调整大小的方法（in this image 右下角你可以看到窗口）。

申请代码可以是found here

Answer 1

解决方案无论您为实时摄像头设置大小、、、opencv 调整窗口大小

import cv2

def main():
    windowName = "Main"
    cv2.namedWindow(windowName)
    cap = cv2.VideoCapture(0)

    print('Width :' + str(cap.get(3)))
    print('Height :' + str(cap.get(4)))

    cap.set(3, 620)
    cap.set(4, 720)




    if cap.isOpened():
        ret, frame = cap.read()
    else:
        ret = False

    while ret:
        ret, frame = cap.read()

        output = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
        cv2.imshow(windowName, frame)
        if cv2.waitKey(1) == 27:
            break

    cv2.destroyAllWindow()

    cap.release()    

if __name__== "__main__":
    main() 

Answer 2

import cv2

def main():

    windowName = "Main"

    cv2.namedWindow(windowName)

    cap = cv2.VideoCapture(0)

    print('Width :' + str(cap.get(3)))
    print('Height :' + str(cap.get(4)))

    cap.set(3, 620)
    cap.set(4, 720)




    if cap.isOpened():
        ret, frame = cap.read()
    else:
        ret = False

    while ret:
        ret, frame = cap.read()

        output = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
        cv2.imshow(windowName, frame)
        if cv2.waitKey(1) == 27:
            break

    cv2.destroyAllWindow()

    cap.release()   
if __name__== "__main__":

    main()