问题描述
我正在运行从 https://learnopencv.com/blob-detection-using-opencv-python-c/ 复制的以下代码并得到如下所示的错误。错误消息没有帮助。代码在 OpenCV4.2 中进行了测试。只是想知道新版本是否有一些语法变化。
# Standard imports
import cv2
import numpy as np;
# Read image
im = cv2.imread("blob.jpg")
# Setup SimpleBlobDetector parameters.
params = cv2.SimpleBlobDetector_Params()
# Change thresholds
params.minThreshold = 10
params.maxThreshold = 200
# Filter by Area.
params.filterByArea = True
params.minArea = 1500
# Filter by Circularity
params.filterByCircularity = True
params.minCircularity = 0.1
# Filter by Convexity
params.filterByConvexity = True
params.minConvexity = 0.87
# Filter by Inertia
params.filterByInertia = True
params.minInertiaratio = 0.01
# Create a detector with the parameters
# OLD: detector = cv2.SimpleBlobDetector(params)
detector = cv2.SimpleBlobDetector_create(params)
# Detect blobs.
keypoints = detector.detect(im)
# Draw detected blobs as red circles.
# cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS ensures
# the size of the circle corresponds to the size of blob
im_with_keypoints = cv2.drawKeypoints(im,keypoints,np.array([]),(0,255),cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)
# Show blobs
cv2.imshow("Keypoints",im_with_keypoints)
cv2.waitKey(0)
文件“”,第 44 行,在 im_with_keypoints = cv2.drawKeypoints(im,cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)
错误:OpenCV(4.5.2) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-vi271kac\opencv\modules\imgproc\src\color.cpp:182: 错误:(- 215:断言失败) !_src.empty() 在函数 'cv::cvtColor'
解决方法
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