Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 127)

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3 Customizing AF Functions
EOS iTR* AF performs autofocus by recognizing faces and subject
colors. EOS iTR AF works when the AF area selection mode is set to
Zone AF, Large Zone AF, or Automatic selection AF.
* intelligent Tracking and Recognition: The function that the metering sensor
identifies the subject to make the AF points tracking it.
u : EOS iTR AF (Face priority)
The AF point is automatically
selected based not only on AF
information, but also the human face
and the subject’s color information.
With AI Servo AF, the subject is tracked while giving higher priority to
using facial information than with the [
EOS iTR AF ] setting. This makes
it easier to keep track of the subject than when only AF information is
available.
In One-Shot AF mode, EOS iTR AF makes focusing human faces
easier, so you can shoot while concentrating on the composition.
ON: EOS iTR AF
The AF point is automatically selected based not only on AF
information, but also the human face and the subject’s color
information. With AI Servo AF, the subject is tracked giving weight to the
information on where (AF point) focus was first achieved, as well as
facial information. The One-Shot AF operation will be the same as the
[
EOS iTR AF (Face priority) ] setting.
OFF: Disable
AF points are automatically selected based only on AF information.
(The AF does not use facial information or the subject’s color
information.)
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Auto AF point selection: EOS iTR AF