sharpness.py

'''
Sharpness detector
Copyright (c) 1991 - 2024 THIBAUTV CORPORATION
Warning This software is under beerware licence. By using it you agree to the
terms and conditions of this licence. See below.
 ----------------------------------------------------------------------------
 "THE BEER-WARE LICENSE" (Revision 42):
 Thibaut V wrote this file.  As long as you retain this notice you
 can do whatever you want with this stuff. If we meet some day, and you think
 this stuff is worth it, you can buy me a beer in return.
 Thibaut V
 ----------------------------------------------------------------------------
'''
import cv2

cam = cv2.VideoCapture(1)

cv2.namedWindow('calibration')

while True:
    ret, frame = cam.read()
    if not ret:
        print("failed to grab frame")
        break

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    sharpness = cv2.Laplacian(gray, cv2.CV_16S).var()
    cv2.putText(frame, f'Sharpness: {int(sharpness)}', (50, 50), cv2.FONT_HERSHEY_SIMPLEX,  1, (0, 0, 255), 1, cv2.LINE_AA)
    cv2.imshow('calibration', frame)

    k = cv2.waitKey(1)
    if k%256 == 27:
        # ESC pressed
        break

cam.release()

cv2.destroyAllWindows()