Method of measuring light using dual cameras

A method of measuring lighting condition using dual cameras, comprising:

• capturing a reference image having a reference exposure value;
• estimating a first minimum exposure target value;
• capturing a first plurality of minimum exposure value images from the first minimum exposure target value to the reference exposure value having a first plurality of associated saturated pixels within the first plurality of minimum exposure value images and a first plurality of associated minimum exposure values;
• determining a first overall minimum exposure value of the first plurality of associated minimum exposure values based on the first plurality of associated saturated pixels within the first plurality of minimum exposure value images;
• estimating a first maximum exposure target value;
• capturing a first plurality of maximum exposure value images from the first maximum exposure target value to the reference exposure value having a first plurality of associated dark pixels within the first plurality of maximum exposure value images and a first plurality of associated maximum exposure values;
• determining a first overall maximum exposure value of the first plurality of associated maximum exposure values based on the first plurality of associated dark pixels within the first plurality of maximum exposure value images;
• and
• estimating a first dynamic exposure range as encompassing a first range having the first overall minimum exposure value as a first lower bound and the first overall maximum exposure value as a first upper bound.