Patent ID: 7433514
Filing Date: 2008-10-07
Classification: G06T,H04N

Abstract:
1. A method for tone mapping a high dynamic range image, the method comprising: obtaining a log-norm luminance component based on a normalized logarithm calculated from the high dynamic range image; flattening the log-norm luminance component using a plurality of incrementally-spaced adaptation levels weighted by a diminishing factor to create a flattened luminance component; restoring visual cues in the flattened luminance component by injecting a proportion of values of the log-norm luminance component, applying histogram tail clipping, and applying a sigmoid curve mapping, to create a restored luminance component; and obtaining a tone-compressed image by mapping luminance of the high dynamic range image using the restored luminance component and adjusting saturation based on a saturation component of the high dynamic range image.