Hi Knut,
and I suspect no dmp file created?
Maybe we can trace the error with this script:
import numpy as np
import cv2
# capture a TOP into a numpyArray
img = op('camColor').numpyArray()*255
# remove the alpha channel
img = img[:,:,:3]
# convert to 8 bit
img = img.astype(np.uint8)
# convert to gray scale
gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
# find corners
ret, corners = cv2.findChessboardCorners(gray, (gridResX, gridResY), None)
If this closes TouchDesigner, we should comment out lines starting from the bottom.
If it runs we can go further and check if the cornerSubPix or calibrateCamera functions are causing this behavior.
Best
Markus