Relationship between bias and physical threshold of EVK3 HD

Relationship between bias and physical threshold of EVK3 HD

According to EVK3 HD bias document, physical threshold of positive and negative events are controlled by bias_diff_on and bias_diff_off, and bias_diff is recomanded not to change. I did some experiment on the 3 bias parameters, and finded a stronger relationship between (on_event_rate / off_event_rate) and [(bias_diff_on - bias_diff) / (bias_diff - bias_diff_off)] than (bias_diff_on / bias_diff_off). Is it responsible? Is it reasonable that I set weight for single on event 1 and weight for single off event -[(bias_diff - bias_diff_off) / (bias_diff_on - bias_diff)] instead of -(bias_diff_off / bias_diff_on) when I try to reconstruct the change of brightness?

If you were not sure about it, I wanna simply ask how should I infer actual threshold from bias parameters of EVK3 HD?
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