What is the default bias value of IMX636? And how to calculate the event based the bias?

What is the default bias value of IMX636? And how to calculate the event based the bias?

We read the default bias by the provided software and obtain the default pos_thres=102%，neg_thres=73%. It's very curious. If we set the intensity of two images as I1 and I2. We can get a positive event only if I2 - I1 > 102% * I1. It seems not very reasonable. If the intensity range in 0~1, for pixels with intensity larger than 0.5, we can never get a positive event. 

Thus I'm curious about the default biase value. I do not know where I misunderstand.
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