Python OpenCV霍夫圆返回无

moiiocjp  于 2023-01-31  发布在  Python
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在我将霍夫圆合并到我正在编写的跟踪程序的主代码中之前,我试图弄清楚霍夫圆,但我似乎只能从圆中得到None。我使用孟加拉国旗作为我的图像,因为它很简单,也很容易检测。以下是我的代码:

import numpy as np
import cv2

img = cv2.imread('Capture.PNG')

grayput = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

circles = cv2.HoughCircles(grayput, cv2.cv.CV_HOUGH_GRADIENT, 1, 20, param1 =50, param2 =10, minRadius=10, maxRadius=40)
print (circles)

    # need circles 
if circles is not None:
    # convert the coord. to integers
    circles = np.round(circles[0, :]).astype("int")

    # loop over the (x, y) coordinates and radius of the circles
    for (x, y, r) in circles:
        # draw the circle in the output image
        cv2.circle(img, (x, y), r, (0, 0, 0), 4)

cv2.imwrite("image.PNG",img)
ajsxfq5m

ajsxfq5m1#

通过反复试验,我能够将param 1和param 2操作到cv2.HoughCircle输出返回numpy. ndarray的位置。如果HoughCircle param 1和/或param 2阈值未满足,则似乎返回None。

kd3sttzy

kd3sttzy2#

下面的代码将为您提供 non-None 圆:

import numpy as np
import cv2

img = cv2.imread("../images/opencv_logo.png", 0)
img = cv2.medianBlur(img,5)
cimg = cv2.cvtColor(img,cv2.COLOR_GRAY2BGR)
cv2.imshow("grayscale", cimg)
cv2.waitKey(0)

circles = cv2.HoughCircles(img,cv2.HOUGH_GRADIENT,1,20,
                                    param1=50,param2=30,minRadius=0,maxRadius=0)
print (circles)

实际上,输出为:

[[[  45.5         133.5          16.50757408]
  [  97.5          45.5          16.80773544]
  [ 147.5         133.5          16.32482719]]]

注意:代码段使用以下内容作为其输入图像:

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