(-215:Assertion failed) s >= 0 in function 'cv::setSize'

See original GitHub issue

I was following your Youtube tutorial but got stuck in this particular problem. I searched a lot but couldn’t find any solution.

Video with Timestamp - https://youtu.be/oXlwWbU8l2o?t=10728

Traceback (most recent call last): File "face_recognize.py", line 43, in <module> face_recognizer.train(features, labels) cv2.error: OpenCV(4.4.0) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-8ely825f\opencv\modules\core\src\matrix.cpp:235: error: (-215:Assertion failed) s >= 0 in function 'cv::setSize'

Issue Analytics

State:
Created 3 years ago
Comments:8 (4 by maintainers)

Top GitHub Comments

1reaction

jasmcauscommented, Feb 11, 2021

Your issue is here: https://github.com/bradtoxic/open-cv-face-detection/blob/7263af8229394674371c28c1a9be8c637714bd4e/face-detection.py#L29

You’ve written

gray[x:y+h, x:x+w]

instead of

faces_roi = gray[y:y+h, x:x+w]

You’re attempting to access a negative index, which is not possible.

At first, I thought it had something to do with a NoneType return, so hence the above tests.

0reactions

vivekthedevcommented, Feb 13, 2021

Your issue is here: https://github.com/bradtoxic/open-cv-face-detection/blob/7263af8229394674371c28c1a9be8c637714bd4e/face-detection.py#L29

You’ve written
gray[x:y+h, x:x+w]
instead of
faces_roi = gray[y:y+h, x:x+w]
You’re attempting to access a negative index, which is not possible.

At first, I thought it had something to do with a NoneType return, so hence the above tests.

It’s working now. Thank you so much