[ WARN:0@0.390] global /io/opencv/modules/dnn/src/dnn.cpp (1483) setUpNet DNN module was not built with CUDA backend; switching to CPU

[BraholliKristi]

[ WARN:0@0.390] global /io/opencv/modules/dnn/src/dnn.cpp (1483) setUpNet DNN module was not built with CUDA backend; switching to CPU
Traceback (most recent call last):
File "/home/braholli/Documents/Yolov4-Detector-and-Distance-Estimator-master/DistanceEstimation.py", line 72, in
mobile_data = object_detector(ref_mobile)
File "/home/braholli/Documents/Yolov4-Detector-and-Distance-Estimator-master/DistanceEstimation.py", line 42, in object_detector
label = "%s : %f" % (class_names[classid[0]], score)
IndexError: invalid index to scalar variable.

[BraholliKristi]

I have Successfully installed opencv-contrib-python-4.5.5.64

[Asadullah-Dal17]

Make sure to choose the correct environment, while running the code.

[hfatima08]

what do you mean by choosing the correct environment? What should i do to solve this issue? I'm using pycharm to run your code.

[Asadullah-Dal17]

a python Virtual Envnieorment in which you have installed required version of opencv

[hfatima08]

but the version you have mentioned is not being installed in the environment

[Asadullah-Dal17]

have you got any specific error message while installation process?

[vlasov01]

Hi,
I've got the same error. I've applied an answer from https://stackoverflow.com/questions/32978575/how-to-fix-indexerror-invalid-index-to-scalar-variable in three places.
But I think without CUDA it is too slow for my RPi4.
And I got another error:
[h264 @ 0x10ad7e20] error while decoding MB 45 2, bytestream -13
Traceback (most recent call last):
File "/home/swim/Yolov4-Detector-and-Distance-Estimator/DistanceEstimation.py", line 92, in
data = object_detector(frame)
^^^^^^^^^^^^^^^^^^^^^^
File "/home/swim/Yolov4-Detector-and-Distance-Estimator/DistanceEstimation.py", line 35, in object_detector
classes, scores, boxes = model.detect(image, CONFIDENCE_THRESHOLD, NMS_THRESHOLD)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cv2.error: OpenCV(4.6.0) ./modules/imgproc/src/resize.cpp:4052: error: (-215:Assertion failed) !ssize.empty() in function 'resize'