GENERATION OF THREE-DIMENSIONAL (3D) LOOKUP TABLE FOR TONE MAPPING OR OTHER IMAGE PROCESSING FUNCTIONS

A method includes obtaining an image and a gain map associated with the image. The method also includes identifying image patches in the image and corresponding gain map patches in the gain map. Different image patches are centered around different anchor points in the image. The method further incl...

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Bibliographic Details
Main Authors Godaliyadda, Gunawath Dilshan, Sheikh, Hamid R, Glotzbach, John W
Format Patent
LanguageEnglish
Published 10.08.2023
Subjects
CALCULATING
COMPUTING
COUNTING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
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Summary:A method includes obtaining an image and a gain map associated with the image. The method also includes identifying image patches in the image and corresponding gain map patches in the gain map. Different image patches are centered around different anchor points in the image. The method further includes, for each image patch and its corresponding gain map patch, generating an intensity-gain curve for the associated anchor point. The intensity-gain curve specifies (i) gain values based on the corresponding gain map patch for intensity values up to a threshold intensity value and (ii) gain values based on one or more input parameters for intensity values above the threshold intensity value. In addition, the method includes combining the intensity-gain curves to generate a 3D lookup table, which identifies the gain values for the anchor points in the image at each of multiple intensity values.
Bibliography:Application Number: US202218046117