OpenCV Python HoughCircles错误 [英] OpenCV Python HoughCircles error

问题描述

我正在开发一个程序来检测图像中的圆形.我决定使用Hough转换是最好的，我在OpenCV库中找到了一个.问题是，当我尝试使用它时，出现错误，我不知道如何解决. Python的OpenCV是否未完全实现?我需要该程序才能正常运行的库吗?

I'm working on a program that detects circular shapes in images. I decided a Hough Transform would be the best, and I found one in the OpenCV library. The problem is that when I try to use it I get an error that I have no idea how to fix. Is OpenCV for Python not fully implemented? Is there a fix to the library I need for the program to work?

代码如下:

import cv

#cv.NamedWindow("camera", 1)
capture = cv.CaptureFromCAM(0)

while True:
    img = cv.QueryFrame(capture)
    gray = cv.CreateImage(cv.GetSize(img), 8, 1)
    edges = cv.CreateImage(cv.GetSize(img), 8, 1)

    cv.CvtColor(img, gray, cv.CV_BGR2GRAY)
    cv.Canny(gray, edges, 50, 200, 3)
    cv.Smooth(gray, gray, cv.CV_GAUSSIAN, 9, 9)

    storage = cv.CreateMat(1, 2, cv.CV_32FC3)

    #This is the line that throws the error
    cv.HoughCircles(edges, storage, cv.CV_HOUGH_GRADIENT, 2, gray.height/4, 200, 100)

    #cv.ShowImage("camera", img)
    if cv.WaitKey(10) == 27:
         break

这是我得到的错误:

OpenCV错误:未知函数中为空pinter()， 文件.. \ .. \ .. \ .. \ ocv \ openc \ src \ cxcore \ cxdatastructs.cpp，第408行 追溯(最近一次通话): 在第20行中输入文件"ellipse-detect-webcam.py" cv.HoughCircles(edges，storage，cv.CV_HOUGH_GRADIENT，2，gray.height/4，200，100) 错误

OpenCV Error: Null pinter () in unknown function, file ..\..\..\..\ocv\openc\src\cxcore\cxdatastructs.cpp, line 408 Traceback (most recent call last): File "ellipse-detect-webcam.py", line 20, in cv.HoughCircles(edges, storage, cv.CV_HOUGH_GRADIENT, 2, gray.height/4, 200, 100) cv.error

预先感谢您的帮助.

推荐答案

对于它的价值，我发现cv.HoughCircles如果无法检测到图像中的圆形，则会中止，而不是优雅地返回空白列表.

For what it's worth, I've found that cv.HoughCircles aborts if it can't detect a circular shape in the image, instead of gracefully returning an empty list.

这篇关于OpenCV Python HoughCircles错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！