如何用python制作虚拟相机？

pip install opencv-python

import cv2
import numpy as np

def virtual_camera_effect(frame):
    # 在这里添加你的图像处理代码，例如：改变颜色、应用滤镜等
    # 示例：将图像转换为灰度
    gray_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    return gray_frame

# 打开摄像头
cap = cv2.VideoCapture(0)

if not cap.isOpened():
    print("Error: Could not open video device.")
    exit()

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

    if not ret:
        print("Error: Could not read frame.")
        break

    virtual_frame = virtual_camera_effect(frame)

    cv2.imshow("Virtual Camera", virtual_frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()