In a chromatic adaptation transform, how can we measure the white reference of the incoming video signals?
It is not possible to measure the white reference value for video signals. Video signals themselves do not specify a color until they are used to drive a display (whether a real or theoretical display). It is the white point of the display that provides the white reference for a chromatic adaptation transform. That is determined by driving the display with maximum RGB values and measuring the color with a spectroradiometer or colorimeter. It might also be available from reading the display specifications (if you trust the accuracy).
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