Crosstalk cancellation in 3D video with local contrast reduction

Many 3D displays suffer from noticeable crosstalk, where some of the light intended for one eye reaches the other one as well. Subtractive crosstalk cancellation, a technique where the images input to the display are modified to account for the crosstalk, can be an effective way to remove the appearance of crosstalk. However, to be effective, crosstalk cancellation requires raising the minimum image level above zero to leave enough `foot-room´ to allow for subtracting out the crosstalk from the other image. In this paper we propose a method for locally raising the image levels in regions that suffer from crosstalk. Our method involves detecting such regions in each frame and adding smooth patches of luminance around these regions. We apply temporal low pass filtering to the regions to prevent flickering, and also add fade-ins and fade-outs to regions of crosstalk that appear or disappear midway through the video to prevent sudden jumps or drops in luminance. Our method allows effective crosstalk cancellation, while maintaining better image contrast than globally scaling the image levels, and also prevents flickering that can occur with methods that operate on a frame by frame basis.