Help with Cardiotocography (CTG) image processing


I am working on applying the knowledge I have gained from fastai on processing Cardiotocography (CTG) images. I am exploring CTU-UHB Intrapartum Cardiotocography Database available on Physionet. I want to process a CTG image and automatically calculate parameters like fetal heart rate, urine contraction, short-term variability, percentage of time with abnormal short term variability etc. But I am struggling with the task. I am not able to find a good resource explaining how to deduce these parameters. I am using Python waveform-database (WFDB) package for processing the images.

I hope someone can point me in the right direction.

Thank you!