在python中识别DM码的代码
时间: 2023-04-02 11:01:32 浏览: 217
以下是 Python 代码示例,用于识别 DM 码:
```python
import cv2
import numpy as np
from pylibdmtx.pylibdmtx import decode
# 读取图片
img = cv2.imread('dm_code.png')
# 转换为灰度图像
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# 二值化处理
ret, thresh = cv2.threshold(gray, , 255, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)
# 寻找轮廓
contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
# 遍历轮廓
for cnt in contours:
# 计算轮廓面积
area = cv2.contourArea(cnt)
if area > 100:
# 提取轮廓的最小矩形
rect = cv2.minAreaRect(cnt)
box = cv2.boxPoints(rect)
box = np.int(box)
# 绘制矩形
cv2.drawContours(img, [box], , (, , 255), 2)
# 提取 DM 码区域
x, y, w, h = cv2.boundingRect(cnt)
dm_code = gray[y:y+h, x:x+w]
# 解码 DM 码
decoded = decode(dm_code)
print(decoded[].data.decode())
```
注意:以上代码需要安装 pylibdmtx 库,可以使用 pip install pylibdmtx 命令进行安装。
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