我的帧差分(前景检测)工作得很好。现在,我想在其中添加一个额外的功能,即blob检测。基本上,我的想法是在被探测到的物体的运动上形成一个水滴圈。在
这是我的代码:
import cv2
cap = cv2.VideoCapture('14.mp4')
ret, current_frame = cap.read()
previous_frame = current_frame
# Setup SimpleBlobDetector parameters.
params = cv2.SimpleBlobDetector_Params()
# Change blob detection thresholds
params.minThreshold = 200
params.maxThreshold = 255
params.minDistBetweenBlobs = 100
# Filter by Area.
params.filterByArea = True
params.minArea = 1200
params.maxArea = 40000
# Filter by Circularity
params.filterByCircularity = False
params.minCircularity = 0.1
# Filter by Convexity
params.filterByConvexity = False
params.minConvexity = 0.87
# Filter by Inertia
params.filterByInertia = True
params.minInertiaRatio = 0.02
# Create a detector with the parameters
detector = cv2.SimpleBlobDetector_create(params)
#Detect blobs
keypoints = detector.detect(current_frame)
while(cap.isOpened()):
current_frame_gray = cv2.cvtColor(current_frame, cv2.COLOR_BGR2GRAY)
previous_frame_gray = cv2.cvtColor(previous_frame, cv2.COLOR_BGR2GRAY)
frame_diff = cv2.absdiff(current_frame_gray,previous_frame_gray)
im_with_keypoints = cv2.drawKeypoints(frame_diff, keypoints, np.array([]), (0,0,255), cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)
cv2.imshow('frame diff ',im_with_keypoints )
if cv2.waitKey(1) & 0xFF == ord('q'):
break
previous_frame = current_frame.copy()
ret, current_frame = cap.read()
keypoints = detector.detect(current_frame)
cap.release()
cv2.destroyAllWindows()
我的错误是“图像不是numpy数组,也不是标量”
你应该导入库“numpy”
你可以在你的命令(win+R,cmd,enter)上调用它:pip install numpy
然后写下你的代码:导入numpy作为np
您正在将您的} ,但是
cap
变量传递给函数^{cap
来自返回CvCapture对象而不是Numpy数组的{a2}。在相反,您应该使用
.read()
返回的current_frame
。在这个问题是由阈值参数引起的,主要是}。你为什么要设定这些具体的价值观?试着把它们夹起来直到你得到好的结果。在
params.minThreshold = 100
和{顺便说一句,你似乎没有发现这个错误,但是我在我的一个.avi视频上运行你的代码时遇到了一个cv2.error。我通过将
while(cap.isOpened()):
更改为while(ret)
来修复它。在相关问题 更多 >
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