Improve accuracy of the ultraface-rfb-640.onnx model

[isaacporras]

Hi,

Currently, I'm using version-RFB-640.onnx to perform face detection on a video from a cpp program. It works well on some videos but on others, it doesn't. The detection seems to be intermittent, at some frames, it detects some of the faces, but most of the time it doesn't. Is there a way to maybe adjust the tolerance/confidence of the model or improve the accuracy of the model?

Frame where onnx model did detect the face (the girl with purple blazer):

Frame where it didn't detect the face:

As you can see, it doesn't seem to be working on the more further faces or from the guys on the right.