如何使用python-opencv实现对机械零件的尺寸检测

要使用Python-OpenCV实现机械零件的尺寸检测，可以按照以下步骤进行：

1. 导入必要的库

import cv2
import numpy as np

2. 读取图像

img = cv2.imread('part.jpg')

3. 灰度化和二值化

gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
_, thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)

4. 轮廓检测

contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

5. 遍历轮廓，计算尺寸

for cnt in contours:
    area = cv2.contourArea(cnt)
    perimeter = cv2.arcLength(cnt, True)
    x, y, w, h = cv2.boundingRect(cnt)
    aspect_ratio = float(w) / h
    rect_area = w * h
    extent = float(area) / rect_area
    hull = cv2.convexHull(cnt)
    hull_area = cv2.contourArea(hull)
    solidity = float(area) / hull_area

6. 显示结果

cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

以上就是使用Python-OpenCV实现机械零件尺寸检测的基本步骤，具体实现还需要根据实际情况进行调整和优化。