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histogram data format?

i want do dynamic GBCE, so i need to do histogram equalization,i tried to use Histogram,and got a group of 20bits data ,i find the format of this data in DM365 manual, but there is only a explanation of the low 8 bits,i don‘t quite understand about the infomation of this data,can u provide me a detail about this data?

and as my purpose, the histogram equalization, the data from Histogram  function will help? or how can i get the histogram of the luminance in all range