I want to detect blue circles and it's center from the video captured using my webcam. That's why I formed the following code given below: (I am using OpenCV 3.1.0 and PyCharm as an IDE and Anaconda Python 2.7 for 64 bits)
import cv2
import numpy as np
cap = cv2.VideoCapture(0)
while(True):
frame, _ = cap.read()
# blurring the frame that's captured
frame_gau_blur = cv2.GaussianBlur(frame, (3, 3), 0)
# converting BGR to HSV
hsv = cv2.cvtColor(frame_gau_blur, cv2.COLOR_BGR2HSV)
# the range of blue color in HSV
lower_blue = np.array([110, 50, 50])
higher_blue = np.array([130, 255, 255])
# getting the range of blue color in frame
blue_range = cv2.inRange(hsv, lower_blue, higher_blue)
# getting the V channel which is the gray channel
blue_s_gray = blue_range[::2]
# applying HoughCircles
circles = cv2.HoughCircles(blue_s_gray, cv2.HOUGH_GRADIENT, 1, 10, 100, 30, 5, 50)
circles = np.uint16(np.around(circles))
for i in circles[0,:]:
# drawing on detected circle and its center
cv2.circle(frame,(i[0],i[1]),i[2],(0,255,0),2)
cv2.circle(frame,(i[0],i[1]),2,(0,0,255),3)
cv2.imshow('circles', frame)
k = cv2.waitKey(5) & 0xFF
if k == 27:
break
cv2.destroyAllWindows()
But after running the code I get an error. And the error is:
OpenCV Error: Assertion failed (depth == CV_8U || depth == CV_16U || depth == CV_32F) in cv::cvtColor, file C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\imgproc\src\color.cpp, line 7935 Traceback (most recent call last): File "C:/Users/Meliodas/PycharmProjects/OpenCV_By_Examples/code_tester.py", line 10, in <module> hsv = cv2.cvtColor(frame_gau_blur, cv2.COLOR_BGR2HSV) cv2.error: C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\imgproc\src\color.cpp:7935: error: (-215) depth == CV_8U || depth == CV_16U || depth == CV_32F in function cv::cvtColor
How do i solve this error? Thanks a lot in advance, for being so kind to help me.
