In [1]:

    

# Load image
import cv2
import numpy as np
from matplotlib import pyplot as plt


    

In [2]:

    

# Load images
image_bgr = cv2.imread('images/plane_256x256.jpg')
image_gray = cv2.cvtColor(image_bgr, cv2.COLOR_BGR2GRAY)


    

In [3]:

    

# Number of corners to detect
corners_to_detect = 10
minimum_quality_score = 0.05
minimum_distance = 25


    

In [4]:

    

# Detect corners
corners = cv2.goodFeaturesToTrack(image_gray, 
                                  corners_to_detect, 
                                  minimum_quality_score,
                                  minimum_distance)
corners = np.float32(corners)


    

In [5]:

    

# Draw white circle at each corner
for corner in corners:
    x, y = corner[0]
    cv2.circle(image_bgr, (x,y), 10, (255,255,255), -1)


    

In [6]:

    

# Convert to grayscale
image_gray = cv2.cvtColor(image_bgr, cv2.COLOR_BGR2GRAY)

# Show image
plt.imshow(image_gray, cmap='gray'), plt.axis("off")
plt.show()