如何使用OpenCV Python检测对象的边缘点？

所以，我已经检测到了一个物体的所有边缘，但问题是我找不到每一条边缘的两点，即起点和终点及其坐标

事实上，我试图找到一个物体的测量值，但我被这个问题困住了

尝试改用：

结果:

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您可能需要微调cornerHarris的参数

你能把输入图像的样本和预期的输出一起附上吗？我已经修改了这个问题。你现在能看一下吗？谢谢你的回复。我是否可以将这些点值存储到变量中，以便使用它们计算它们之间的距离？是的，您可以。刚刚编辑了答案。它们与找到的角点非常接近，因为它在同一个角点上找到了多个角点。此外，您提供的建议给了我一个错误：Indexer错误：布尔索引与维度0上的索引数组不匹配；维度是330，但对应的布尔维度是480。我已经尝试了代码，它可以工作。您遇到了什么错误？在第32行：NameError:name“corners”未定义，我遇到了此错误。

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

#Read Image of the Object
img = cv2.imread("C:\\Users\\Desktop\\Project\\captured.jpg")
cv2.imshow('Original Image', img)
cv2.waitKey(0)



#Convert Image To GrayScale
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.imshow('Gray', gray)
cv2.waitKey(0)


#Binary Thresholding
ret, thresh = cv2.threshold(gray, 150, 255, cv2.THRESH_BINARY_INV)
cv2.imshow('Binary Image', thresh)
cv2.waitKey(0)

#Crop Image
cropped = thresh[150:640, 150:500]
cv2.imshow('Cropped Image', cropped)
cv2.waitKey(0)

#Edge Detection
edges = cv2.Canny(cropped, 100, 200)
cv2.imshow('Edges', edges)
cv2.waitKey(0)

#find contours
ctrs, hier = cv2.findContours(cropped, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

#Sort Contours
sorted_ctrs = sorted(ctrs, key=lambda ctr: cv2.boundingRect(ctr)[0] + cv2.boundingRect(ctr)[1] * cropped.shape[1])


#ROI
for i, ctr in enumerate(sorted_ctrs):
    # Get bounding box
    x, y, w, h = cv2.boundingRect(ctr)

    # Getting ROI
    roi = cropped[y:y + h, x:x + w]
    # show ROI
    # cv2.imshow('segment no:'+str(i),roi)
    cv2.rectangle(cropped , (x, y), (x + w, y + h), (150, 0, 255), 2)
cv2.imshow('marked areas', cropped)
cv2.waitKey(0)

import cv2
import numpy as np

def find_centroids(dst):
    ret, dst = cv2.threshold(dst, 0.01 * dst.max(), 255, 0)
    dst = np.uint8(dst)

    # find centroids
    ret, labels, stats, centroids = cv2.connectedComponentsWithStats(dst)
    # define the criteria to stop and refine the corners
    criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 100, 
                0.001)
    corners = cv2.cornerSubPix(gray,np.float32(centroids),(5,5), 
              (-1,-1),criteria)
    return corners

image = cv2.imread("corner.jpg")
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

gray = np.float32(gray)

dst = cv2.cornerHarris(gray, 2, 3, 0.04)

dst = cv2.dilate(dst, None)

# Threshold for an optimal value, it may vary depending on the image.
# image[dst > 0.01*dst.max()] = [0, 0, 255]

# Get coordinates
corners= find_centroids(dst)
# To draw the corners
for corner in corners:
    image[int(corner[1]), int(corner[0])] = [0, 0, 255]
cv2.imshow('dst', image)
cv2.waitKey(0)
cv2.destroyAllWindows()