1.圆形检测
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二值化方法
- 拿到边框之后没法处理
python
from imutils import auto_canny, contours
# 【1】读入图片+预处理
image = cv2.imread('./data/ac1_bar_rotated.png')# 加载图片
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)# 转灰度
blurred = cv2.GaussianBlur(gray, (5, 5), 0)# 高斯模糊
edged = auto_canny(blurred) # 边缘检测
fig = plt.figure(figsize=(20, 30))
plt.imshow(edged, cmap ='gray')
plt.title(u"边缘检测后的图片")
plt.axis('off')
# 检测图片中的最外围轮廓
cnts,_ = cv2.findContours(edged.copy(), cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)
print("原始图片检测的轮廓总数:", len(cnts))
# 定义黑色背景幕布
black_background = np.ones(image.shape, np.uint8)*0
# 将检测到的轮廓添加幕布上进行展示
cv2.drawContours(black_background, cnts, -1, (3,240,240), 2)
fig = plt.figure(figsize=(20, 30))
plt.imshow(black_background)
plt.title(u"原始图片检测到的所有最外围轮廓")
plt.axis('off')
2.二值化
python
from imutils import auto_canny, contours
# 【1】读入图片+预处理
image = cv2.imread('./data/ac1_bar_circle_rotated.png')# 加载图片
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)# 转灰度
# OTSU二值化
thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)[1]
fig = plt.figure(figsize=(15, 20))
plt.imshow(thresh, cmap ='gray')
plt.axis('off')
python
numpy_img = cv2.adaptiveThreshold(gray, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 11, 15) # 自动阈值二值化
fig = plt.figure(figsize=(15, 20))
plt.imshow(thresh, cmap ='gray')
plt.axis('off')
python
img = cv2.imread('./data/ac1_bar_circle_rotated.png')# 加载图片
gray_src= cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
minThreshValue = 35
_, gray = cv2.threshold(gray_src, minThreshValue, 255, cv2.THRESH_BINARY)
gray = cv2.resize(gray, dsize=None, fx=1, fy=1, interpolation=cv2.INTER_LINEAR)
fig = plt.figure(figsize=(15, 20))
plt.imshow(gray, cmap ='gray')
plt.axis('off')
kernel = np.ones((3, 3), dtype=np.uint8)
gray = cv2.dilate(gray, kernel, 1) # 1:迭代次数,也就是执行几次膨胀操作
gray = cv2.erode(gray, kernel, 1)
fig = plt.figure(figsize=(15, 20))
plt.imshow(gray, cmap ='gray')
plt.axis('off')
2.检测图像块