[Python] How to average number of frames in OpenCV2

I found this very nice example, how to make an array of frames: https://stackoverflow.com/a/17394994/7489698

But I do not know how to use this in PIL correctly. To demonstrate it, I have sketched this commands:

import numpy as np
import cv2
from PIL import Image, ImageTk

nframes = 10
frame = cv2.imread('test.jpg')

(x,y,d)=frame.shape
frames = np.empty((nframes,x, y, d))

for k in range(nframes):
frames[k,:,:,:] = frame

frame_avg=np.int8(np.mean(frames,0))
frame_avg.shape

cv2.imwrite('test_avg.jpg',frame_avg)

Image.fromarray(frame)
Image.fromarray(frame_avg)


The image test.jpg is read and 10 times stored in the array frames. The average thereof is stored in the file test_avg.jpg where it can be seen that it looks ok.

Converting the orignal frame to a PIL image is working, but the last line throws this error:

---> 20 Image.fromarray(frame_avg)

/usr/local/lib/python3.10/dist-packages/PIL/Image.py in fromarray(obj, mode)
3313 typekey_shape, typestr = typekey
3314 msg = f"Cannot handle this data type: {typekey_shape}, {typestr}"
-> 3315 raise TypeError(msg) from e
3316 else:
3317 rawmode = mode

TypeError: Cannot handle this data type: (1, 1, 3), |i1


What did I do wrong???

KR, Christof

Continue reading...