I'm using opencv 3.1 in RaspberryPi 3. I,m trying to run the following Hough Circle detection algorithm
#! /usr/bin/python
import numpy as np
import cv2
from cv2 import cv
VInstance = cv2.VideoCapture(0)
key = True
"""
params = dict(dp,
minDist,
circles,
param1,
param2,
minRadius,
maxRadius)
"""
def draw_circles(circles, output):
if circles is not None:
for i in circles[0,:]:
#draw the outer circle
cv2.circle(output,(i[0],i[1]),i[2],(0,255,0),2)
#draw the centre of the circle
cv2.circle(output,(i[0],i[1]),2,(0,0,255),3)
print("The number of circles if %d" %(circles[0].shape[0]))
elif circles is None:
print ("The number of circles is 0")
if __name__ == '__main__':
while key:
ret,img = VInstance.read()
## Smooth image to reduce the input noise
imgGray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
imgSmooth = cv2.GaussianBlur(imgGray,(5,5),3)
## Compute Hough Circles
circles = cv2.HoughCircles(imgSmooth,cv2.cv.CV_HOUGH_GRADIENT,1,100,
param1=80,
param2=50,
minRadius=50,
maxRadius=100)
draw_circles(circles,img)
## Display the circles
cv2.imshow('detected circles',imgGray)
cv2.imshow("result",img)
k = cv2.waitKey(1)
if k == 27:
cv2.destroyAllWindows()
break
But I'm getting Assertion Failed error, details are below.
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp, line 8000
Traceback (most recent call last):
File "HoughCircles.py", line 70, in
imgGray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
cv2.error: /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp:8000: error: (-215) scn == 3 || scn == 4 in function cvtColor
Can anyone please check and help!
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