Patent Document ID: 9501818
Application ID: 14992428
Patent Status: 1

Claim One:
1. A method for local tone mapping, the method comprising: receiving an input high dynamic range (HDR) image ( 204 ); converting luminance values in the input HDR image into a logarithmic domain to generate a logarithmic input image ( 212 ); applying a global tone-mapping operator ( 216 ) to the logarithmic input image to generate a logarithmic global tone-mapped image; generating a high resolution (HR) ratio image ( 228 ) based on the luminance values of the global tone-mapped image and the input HDR image; generating based on the HR ratio image at least two different scale ratio images, each being of a different spatial resolution level ( 220 ); merging the at least two different scale ratio images to generate a local multiscale ratio image that comprises a weighted combination of the at least two different scale ratio images, wherein the local multiscale ratio image is obtained using recursive processing; and adding ( 222 ) the local multiscale ratio image to the logarithmic input image to generate pixel values of a luminance output tone-mapped image in the logarithmic domain ( 232 ).