ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,725,225, issued on Sept. 1, was assigned to ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (Daejeon, South Korea).

"Hierarchical sub-image histogram equalization system and method" was invented by Won Jong Kim (Daejeon, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed herein is an image processing apparatus. The apparatus may include a memory, and a processor connected to the memory, wherein the processor may divide an input image hierarchically, determine whether each sub-image requires histogram equalization, and perform histogram equalization on a sub-image that requires histogram equalization."

The patent was filed on Jan...