US 12,143,733 B2
Intensity separated local white balance correction
Gang Hua, Katy, TX (US); Shashank Dabral, Allen, TX (US); Mihir Narendra Mody, Bangalore (IN); Rajasekhar Reddy Allu, Plano, TX (US); and Niraj Nandan, Plano, TX (US)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Apr. 3, 2023, as Appl. No. 18/194,762.
Application 18/194,762 is a continuation of application No. 17/110,139, filed on Dec. 2, 2020, granted, now 11,653,105.
Prior Publication US 2023/0239585 A1, Jul. 27, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 23/88 (2023.01); H04N 9/78 (2006.01); H04N 23/71 (2023.01); H04N 23/741 (2023.01); H04N 23/76 (2023.01)
CPC H04N 23/88 (2023.01) [H04N 9/78 (2013.01); H04N 23/71 (2023.01); H04N 23/741 (2023.01); H04N 23/76 (2023.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
collecting, by an image signal processor (ISP), statistics for local automatic white balance (AWB) from at least one wide dynamic range (WDR) image received by the ISP;
generating, by a processor, based on the statistics, a plurality of local gain lookup tables (LUTs), each local gain LUT corresponding to a color channel represented in the at least one WDR image, and each local gain LUT providing a correlation between gain and intensity; and
processing a WDR image, including, for each pixel of multiple pixels of the WDR image:
calculating an intensity value;
determining a local gain LUT of the plurality of local gain LUTs that corresponds to the color channel of the pixel;
identifying a local gain value corresponding to the calculated intensity value of the pixel based on the determined local gain LUT; and
applying the local gain value to the pixel.