OpenCV TypeError: Expected cv::UMat for argument 'src' - What is this?

Question

Disclaimer: huge openCV noob

Traceback (most recent call last):

File "lanes2.py", line 22, in

canny = canny(lane_image) 

File "lanes2.py", line 5, in canny

gray = cv2.cvtColor(imgUMat, cv2.COLOR_RGB2GRAY) 

TypeError: Expected cv::UMat for argument 'src'

What exactly is 'src' referring to?

Answer 1

src is the first argument to cv2.cvtColor.

The error you are getting is because it is not the right form. cv2.Umat() is functionally equivalent to np.float32(), so your last line of code should read:

gray = cv2.cvtColor(np.float32(imgUMat), cv2.COLOR_RGB2GRAY) 

Answer 2

gray = cv2.cvtColor(cv2.UMat(imgUMat), cv2.COLOR_RGB2GRAY) 

UMat is a part of the Transparent API (TAPI) than help to write one code for the CPU and OpenCL implementations.