How to find the extreme corner point in image ？

Question

Form the source images above ( source image1、image2), I wanna find the extreme corner point and get the points like destination image1、image2 what I dr

Answer 1

You can use cv2.goodFeaturesToTrack() for corner detection. The function takes four parameters

corners = cv2.goodFeaturesToTrack(image, maxCorners, qualityLevel, minDistance)

• image - Input 8-bit or floating-point 32-bit grayscale single-channel image
• maxCorners - Maximum number of corners to return
• qualityLevel - Minimum accepted quality level of corners between 0-1. All corners below quality level are rejected
• minDistance - Minimum possible Euclidean distance between corners

import cv2

image = cv2.imread('1.png')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

corners = cv2.goodFeaturesToTrack(gray,10,0.2,20)

for corner in corners:
    x,y = corner.ravel()
    cv2.circle(image,(x,y),5,(36,255,12),-1)

cv2.imshow('image', image)
cv2.waitKey()