import cv2
import numpy as np

def detect():
    img1 = cv2.imread('znak1.png',1)
    img2 = cv2.imread('znak1.png',1)

    fast = cv2.FastFeatureDetector_create(threshold=70, nonmaxSuppression=1)
    kp1 = fast.detect(img1, None)
    kp2 = fast.detect(img2, None)

    orb = cv2.ORB_create()
    kp1, des1 = orb.compute(img1, kp1)
    kp2, des2 = orb.compute(img2, kp2)

    bf = cv2.BFMatcher(cv2.NORM_HAMMING)
    matches = bf.match(des1, des2)

    img3 = cv2.drawMatches(img1, kp1, img2, kp2, matches[:20], (100, 0, 0))
    cv2.imshow('image', img3)
    cv2.waitKey(0)

detect()