findChessboardCorners 在 opencv 4.5.2 python 中不起作用

如何解决findChessboardCorners 在 opencv 4.5.2 python 中不起作用

我在 python 中使用 findChessboardCorners() 来查找角点，但它从未奏效。我尝试了灰色图像和黑白图像，但它仍然不起作用。有人能帮我吗？这是代码和图片。

import numpy as np
import cv2
import math
from matplotlib import pyplot as plt

def draw_img(img):
    plt.figure()
    plt.imshow(img)
    plt.axis('off')
    plt.show()
    
img = cv2.imread("a.png")
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)  # Gray
complement_gray = cv2.bitwise_not(gray)  # Complement gray
_,bw_img = cv2.threshold(gray,127,255,cv2.THRESH_BINARY)  # black and white

success = False
for i in range(3,12):
    for j in range(3,12):
        ret,corners = cv2.findChessboardCorners(img,(i,j),cv2.CALIB_CB_ADAPTIVE_THRESH + cv2.CALIB_CB_FILTER_QUADS)
        if ret:
            success = True;
            break;
            
        ret,corners = cv2.findChessboardCorners(complement_gray,corners = cv2.findChessboardCorners(bw_img,cv2.CALIB_CB_ADAPTIVE_THRESH + cv2.CALIB_CB_FILTER_QUADS)
        if ret:
            success = True;
            break;
            
if success:
    print("Success")