Patent ID: 9367905
Filing Date: 2016-06-14
CPC Classification: G06T,G09G,H04N

Claim Text:
1. A method of enhancing a backlight-scaled image, comprising a digital image processor for performing the following steps: using a visibility prediction unit of the digital image processor to determine a minimum perceptible luminance threshold of cone response with dim backlight; using a luminance extraction unit of the digital image processor to extract a luminance layer associated with an image; using a decomposition unit of the digital image processor to decompose the luminance layer into a human visual system (HVS) response layer and a background luminance layer for each pixel of the luminance layer; using a luminance boosting unit of the digital image processor to boost and compress luminance of dark pixels of the background luminance layer to a perceptible range above the minimum perceptible luminance threshold, thereby resulting in an enhanced background luminance layer; using a composition unit of the digital image processor to generate an enhanced luminance layer through composition using the HVS response layer and the enhanced background luminance layer as inputs; and displaying an image on an imaging device; wherein the minimum perceptible luminance threshold is determined by performing visibility prediction based on a visibility model, inputs of which are an image, a backlight intensity level, and an ambient light intensity level.