使用opencv抠图
时间: 2023-12-03 12:41:00 浏览: 42
以下是使用OpenCV进行抠图的步骤:
1.加载图片并将其转换为灰度图像
```python
import cv2
image = cv2.imread("353.jpg")
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
```
2.使用阈值将图像二值化
```python
ret, thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY_INV+cv2.THRESH_OTSU)
```
3.对二值化后的图像进行形态学操作,以去除噪声和填充图像内部的空洞
```python
kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (3, 3))
closed = cv2.morphologyEx(thresh, cv2.MORPH_CLOSE, kernel)
```
4.找到图像中的轮廓
```python
contours, hierarchy = cv2.findContours(closed, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
```
5.创建一个掩膜,将轮廓内的区域填充为白色
```python
mask = np.zeros(image.shape[:2], dtype="uint8")
cv2.drawContours(mask, [max(contours, key=cv2.contourArea)], -1, 255, -1)
```
6.将掩膜应用于原始图像,以提取轮廓内的区域
```python
result = cv2.bitwise_and(image, image, mask=mask)
```