Python example to show an image in full screen by opencv

opencv_imshow_fullscreen.py

# -*- coding: utf-8 -*-
"""
Created on Thu Jun 22 16:44:27 2017

@author: sakurai
"""


import numpy as np
import cv2
import screeninfo

if __name__ == '__main__':
    screen_id = 2
    is_color = False

    # get the size of the screen
    screen = screeninfo.get_monitors()[screen_id]
    width, height = screen.width, screen.height

    # create image
    if is_color:
        image = np.ones((height, width, 3), dtype=np.float32)
        image[:10, :10] = 0  # black at top-left corner
        image[height - 10:, :10] = [1, 0, 0]  # blue at bottom-left
        image[:10, width - 10:] = [0, 1, 0]  # green at top-right
        image[height - 10:, width - 10:] = [0, 0, 1]  # red at bottom-right
    else:
        image = np.ones((height, width), dtype=np.float32)
        image[0, 0] = 0  # top-left corner
        image[height - 2, 0] = 0  # bottom-left
        image[0, width - 2] = 0  # top-right
        image[height - 2, width - 2] = 0  # bottom-right

    window_name = 'projector'
    cv2.namedWindow(window_name, cv2.WINDOW_NORMAL)
    cv2.moveWindow(window_name, screen.x - 1, screen.y - 1)
    cv2.setWindowProperty(window_name, cv2.WND_PROP_FULLSCREEN,
                          cv2.WINDOW_FULLSCREEN)
    cv2.imshow(window_name, image)
    cv2.waitKey()
    cv2.destroyAllWindows()

Thanks so much been looking around for this

I had to make a small change to work for me on my RPi

`
from screeninfo import get_monitors
import numpy as np
import cv2

screen = get_monitors()[0]
print(screen)
width, height = screen.width, screen.height

is_color = True

if is_color:
image = np.ones((height, width, 3), dtype=np.float32)
image[:10, :10] = 0 # black at top-left corner
image[height - 10:, :10] = [1, 0, 0] # blue at bottom-left
image[:10, width - 10:] = [0, 1, 0] # green at top-right
image[height - 10:, width - 10:] = [0, 0, 1] # red at bottom-right
else:
image = np.ones((height, width), dtype=np.float32)
image[0, 0] = 0 # top-left corner
image[height - 2, 0] = 0 # bottom-left
image[0, width - 2] = 0 # top-right
image[height - 2, width - 2] = 0 # bottom-right

window_name = 'projector'
cv2.namedWindow(window_name, cv2.WND_PROP_FULLSCREEN)
cv2.moveWindow(window_name, screen.x - 1, screen.y - 1)
cv2.setWindowProperty(window_name, cv2.WND_PROP_FULLSCREEN,
cv2.WINDOW_FULLSCREEN)
cv2.imshow(window_name, image)
cv2.waitKey()
cv2.destroyAllWindows()`

Thanks a lot, works for me and I can project images with Raspberry Pi. Best regards

Thanks