pip install numpy

pip install matplotlib

pip install opencv-python

image.php

import cv2 as cv
import sys
img = cv.imread(cv.samples.findFile("starry_night.jpg"))
if img is None:
 sys.exit("Could not read the image.")
cv.imshow("Display window", img)
k = cv.waitKey(0)
if k == ord("s"):
 cv.imwrite("starry_night.png", img)

myexample.php

<?php echo "hello world!"; ?>

Referências:

Install OpenCV-Python Windows

OpenCV-Python Tutorials