Patent ID: 8248486
Filing Date: 2012-08-21
Classification: H04N

Abstract:
1. A method, comprising: receiving a high dynamic range (HDR) image; receiving a tone-mapped (TM) image generated based on the HDR image, the TM image comprising one or more color alterations that are not recoverable from the TM image with a luminance ratio image; computing luminance ratio values, on an individual pixel basis, by dividing luminance values of the HDR image with luminance values of the TM image on the individual pixel basis; applying the luminance ratio values to the HDR image to create a re-mapped image; determining residual values in color channels of a color space based on the re-mapped image and the TM image; and outputting the TM image with HDR reconstruction data, the HDR reconstruction data being derived from the luminance ratio values and the residual values.