使用OpenCV检测一张纸上的衣服按钮

import cv2

# 读取图像
img = cv2.imread('image.jpg')

# 图像预处理
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
ret, thresh = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY)

# 图像分割
contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

# 特征提取和匹配
for contour in contours:
    # 提取特征
    x, y, w, h = cv2.boundingRect(contour)
    roi = img[y:y+h, x:x+w]
    # 特征匹配
    # ...
    # 判断是否为衣服按钮
    # ...
    # 标记位置
    cv2.rectangle(img, (x, y), (x+w, y+h), (0, 255, 0), 2)

# 输出结果
cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()