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some questions about autofocus

hi everyone

I'm using DM368 and try to implement something related to focus

I can read the value from h3a but I cant understand what the value means exactly

does anybody know that how the value is calculated

or where to see the related documents or papers

I've found a document named "AF_Merit_Fxn_IPNC_DM36x" but it can't help me to understand overall

thanks very much