1. A method of operation of a display system comprising: calculating a focus measure for an original image; calculating a segment mean based on the focus measure for a segment of the original image; generating an ordered segment, with a control unit, based on the segment mean; generating a segment depth based on the ordered segment, given by: 
 D ( x,y )| (x,y)εR k =A/S max S k wherein D(x,y) is the segment depth, A is a gain, S max is a maximum value of the segment mean for the original image, and S k is the segment mean for the segment; and generating a three-dimensional image with the segment depth for displaying on a device.