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OpenCV face recognition prediction and confidence values

Hi, i am developing face recognition software using OpenCV in C++. For that i am using createLBPHFaceRecognizer(). So when i call predict function(e.g. model->predict(face, predictedLabel, predictedConfidence)), i am getting confidence value around 100 when user face is near to camera but as i maintain some distance between camera and face then it will give confidence around 200 or max sometimes. So i am confused about this result. why i am getting this much of variation. Is there something i missed ? And which confidence is good, 100 or 200?