Patent ID: 8493313

Claim:
A method comprising the steps of: receiving a segment of a video; calculating a rear modulation signal for the received segment wherein the rear modulation signal comprises a plurality of control signals, the control signals respectively corresponding to separately-controllable elements of a backlight; calculating a difference in intensity between the rear modulation signal of the received segment and a rear modulation signal of a previous frame corresponding to the received segment; and modifying the rear modulation signal for the received segment with a temporal filtering limit R to obtain an actual rear modulation signal for the received segment; wherein the temporal filtering limit R limits at least a rate of increase or a rate of decrease in intensity of elements of the backlight; and wherein calculating the rear modulation signal comprises: performing first downsampling on the received segment; applying a spatial filter to the downsampled received segment; and performing a second downsampling on the spatially-filtered, downsampled, received segment.